diff --git a/animeHandler.js b/app/animeHandler.js
similarity index 100%
rename from animeHandler.js
rename to app/animeHandler.js
diff --git a/app.html b/app/app.html
similarity index 99%
rename from app.html
rename to app/app.html
index 0393590..b034738 100644
--- a/app.html
+++ b/app/app.html
@@ -219,8 +219,6 @@
     <script src="https://cdn.jsdelivr.net/npm/webtorrent@latest/webtorrent.min.js" defer></script>
     <script src="torrentHandler.js" defer></script>
     <script src="rangeParser.js" defer></script>
-    <script src="index3.js"></script>
-    <script src="test.js"></script>
 </body>
 
 </html>
\ No newline at end of file
diff --git a/css1.css b/app/css1.css
similarity index 100%
rename from css1.css
rename to app/css1.css
diff --git a/css2.css b/app/css2.css
similarity index 100%
rename from css2.css
rename to app/css2.css
diff --git a/logofinal small.png b/app/logofinal small.png
similarity index 100%
rename from logofinal small.png
rename to app/logofinal small.png
diff --git a/playerHandler.js b/app/playerHandler.js
similarity index 100%
rename from playerHandler.js
rename to app/playerHandler.js
diff --git a/rangeParser.js b/app/rangeParser.js
similarity index 100%
rename from rangeParser.js
rename to app/rangeParser.js
diff --git a/sw.js b/app/sw.js
similarity index 100%
rename from sw.js
rename to app/sw.js
diff --git a/torrentHandler.js b/app/torrentHandler.js
similarity index 100%
rename from torrentHandler.js
rename to app/torrentHandler.js
diff --git a/bundle.js b/bundle.js
deleted file mode 100644
index 063d8c1..0000000
--- a/bundle.js
+++ /dev/null
@@ -1 +0,0 @@
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language found matches the user preference. (1 bit)",multiple:!1,webm:!1}],[137,{name:"ChapterTrackNumber",level:5,type:"u",mandatory:!0,multiple:!0,minver:1,webm:!1,range:"not 0",description:"UID of the Track to apply this chapter too. In the absense of a control track, choosing this chapter will select the listed Tracks and deselect unlisted tracks. Absense of this element indicates that the Chapter should be applied to any currently used Tracks."}],[145,{name:"ChapterTimeStart",level:4,type:"u",mandatory:!0,minver:1,webm:!0,description:"Timestamp of the start of Chapter (not scaled).",multiple:!1}],[146,{name:"ChapterTimeEnd",level:4,type:"u",minver:1,webm:!1,description:"Timestamp of the end of Chapter (timestamp excluded, not scaled).",multiple:!1}],[150,{name:"CueRefTime",level:5,type:"u",mandatory:!0,minver:2,webm:!1,description:"Timestamp of the referenced Block.",multiple:!1}],[151,{name:"CueRefCluster",level:5,type:"u",mandatory:!0,webm:!1,description:"The Position of the Cluster containing the referenced Block.",minver:0,multiple:!1}],[152,{name:"ChapterFlagHidden",level:4,type:"u",mandatory:!0,minver:1,webm:!1,default:0,range:"0-1",description:"If a chapter is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)",multiple:!1}],[16980,{name:"ContentCompAlgo",level:6,type:"u",mandatory:!0,minver:1,webm:!1,default:0,br:["","","",""],del:["1 - bzlib,","2 - lzo1x"],description:"The compression algorithm used. Algorithms that have been specified so far are: 0 - zlib,   3 - Header Stripping",multiple:!1}],[16981,{name:"ContentCompSettings",level:6,type:"b",minver:1,webm:!1,description:"Settings that might be needed by the decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that were removed from the beggining of each frames of the track.",multiple:!1}],[17026,{name:"DocType",level:1,type:"s",mandatory:!0,default:"matroska",minver:1,description:"A string that describes the type of document that follows this EBML header. 'matroska' in our case or 'webm' for webm files.",multiple:!1,webm:!1}],[17029,{name:"DocTypeReadVersion",level:1,type:"u",mandatory:!0,default:1,minver:1,description:"The minimum DocType version an interpreter has to support to read this file.",multiple:!1,webm:!1}],[17030,{name:"EBMLVersion",level:1,type:"u",mandatory:!0,default:1,minver:1,description:"The version of EBML parser used to create the file.",multiple:!1,webm:!1}],[17031,{name:"DocTypeVersion",level:1,type:"u",mandatory:!0,default:1,minver:1,description:"The version of DocType interpreter used to create the file.",multiple:!1,webm:!1}],[17476,{name:"SegmentFamily",level:2,type:"b",multiple:!0,minver:1,webm:!1,bytesize:16,description:"A randomly generated unique ID that all segments related to each other must use (128 bits)."}],[17505,{name:"DateUTC",level:2,type:"d",minver:1,description:"Date of the origin of timestamp (value 0), i.e. production date.",multiple:!1,webm:!1}],[17540,{name:"TagDefault",level:4,type:"u",mandatory:!0,minver:1,webm:!1,default:1,range:"0-1",description:"Indication to know if this is the default/original language to use for the given tag. (1 bit)",multiple:!1}],[17541,{name:"TagBinary",level:4,type:"b",minver:1,webm:!1,description:"The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString.",multiple:!1}],[17543,{name:"TagString",level:4,type:"8",minver:1,webm:!1,description:"The value of the Tag.",multiple:!1}],[17545,{name:"Duration",level:2,type:"f",minver:1,range:"> 0",description:"Duration of the segment (based on TimecodeScale).",multiple:!1,webm:!1}],[17816,{name:"ChapterFlagEnabled",level:4,type:"u",mandatory:!0,minver:1,webm:!1,default:1,range:"0-1",description:"Specify wether the chapter is enabled. It can be enabled/disabled by a Control Track. When disabled, the movie should skip all the content between the TimeStart and TimeEnd of this chapter (see flag notes). (1 bit)",multiple:!1}],[18016,{name:"FileMimeType",level:3,type:"s",mandatory:!0,minver:1,webm:!1,description:"MIME type of the file.",multiple:!1}],[18017,{name:"FileUsedStartTime",level:3,type:"u",divx:!0,description:"DivX font extension",multiple:!1}],[18018,{name:"FileUsedEndTime",level:3,type:"u",divx:!0,multiple:!1,description:"DivX font extension"}],[18037,{name:"FileReferral",level:3,type:"b",webm:!1,description:"A binary value that a track/codec can refer to when the attachment is needed.",multiple:!1}],[20529,{name:"ContentEncodingOrder",level:5,type:"u",mandatory:!0,minver:1,webm:!1,default:0,multiple:!1,description:"Tells when this modification was used during encoding/muxing starting with 0 and counting upwards. The decoder/demuxer has to start with the highest order number it finds and work its way down. This value has to be unique over all ContentEncodingOrder elements in the segment."}],[20530,{name:"ContentEncodingScope",level:5,type:"u",mandatory:!0,minver:1,webm:!1,default:1,range:"not 0",br:["","",""],description:"A bit field that describes which elements have been modified in this way. Values (big endian) can be OR'ed. Possible values: 1 - all frame contents, 2 - the track's private data, 4 - the next ContentEncoding (next ContentEncodingOrder. Either the data inside ContentCompression and/or ContentEncryption)",multiple:!1}],[20531,{name:"ContentEncodingType",level:5,type:"u",mandatory:!0,minver:1,webm:!1,default:0,br:["",""],description:"A value describing what kind of transformation has been done. Possible values: 0 - compression, 1 - encryption",multiple:!1}],[20532,{name:"ContentCompression",level:5,type:"m",minver:1,webm:!1,description:"Settings describing the compression used. Must be present if the value of ContentEncodingType is 0 and absent otherwise. Each block must be decompressable even if no previous block is available in order not to prevent seeking.",multiple:!1}],[20533,{name:"ContentEncryption",level:5,type:"m",minver:1,webm:!1,description:"Settings describing the encryption used. Must be present if the value of ContentEncodingType is 1 and absent otherwise.",multiple:!1}],[21368,{name:"CueBlockNumber",level:4,type:"u",minver:1,default:1,range:"not 0",description:"Number of the Block in the specified Cluster.",multiple:!1}],[22100,{name:"ChapterStringUID",level:4,type:"8",mandatory:!1,minver:3,webm:!0,description:"A unique string ID to identify the Chapter. Use for WebVTT cue identifier storage.",multiple:!1}],[22337,{name:"WritingApp",level:2,type:"8",mandatory:!0,minver:1,multiple:!1,description:'Writing application ("mkvmerge-0.3.3").'}],[22612,{name:"SilentTracks",cppname:"ClusterSilentTracks",level:2,type:"m",minver:1,multiple:!1,webm:!1,description:"The list of tracks that are not used in that part of the stream. It is useful when using overlay tracks on seeking. Then you should decide what track to use."}],[25152,{name:"ContentEncoding",level:4,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!1,description:"Settings for one content encoding like compression or encryption."}],[25188,{name:"BitDepth",cppname:"AudioBitDepth",level:4,type:"u",minver:1,range:"not 0",multiple:!1,description:"Bits per sample, mostly used for PCM."}],[25906,{name:"SignedElement",level:3,type:"b",multiple:!0,webm:!1,description:"An element ID whose data will be used to compute the signature."}],[26148,{name:"TrackTranslate",level:3,type:"m",multiple:!0,minver:1,webm:!1,description:"The track identification for the given Chapter Codec."}],[26897,{name:"ChapProcessCommand",cppname:"ChapterProcessCommand",level:5,type:"m",multiple:!0,minver:1,webm:!1,description:"Contains all the commands associated to the Atom."}],[26914,{name:"ChapProcessTime",cppname:"ChapterProcessTime",level:6,type:"u",mandatory:!0,minver:1,webm:!1,description:"Defines when the process command should be handled (0: during the whole chapter, 1: before starting playback, 2: after playback of the chapter)."}],[26916,{name:"ChapterTranslate",level:2,type:"m",multiple:!0,minver:1,webm:!1,description:"A tuple of corresponding ID used by chapter codecs to represent this segment."}],[26931,{name:"ChapProcessData",cppname:"ChapterProcessData",level:6,type:"b",mandatory:!0,minver:1,webm:!1,description:"Contains the command information. The data should be interpreted depending on the ChapProcessCodecID value. For ChapProcessCodecID = 1, the data correspond to the binary DVD cell pre/post commands."}],[26948,{name:"ChapProcess",cppname:"ChapterProcess",level:4,type:"m",multiple:!0,minver:1,webm:!1,description:"Contains all the commands associated to the Atom."}],[26965,{name:"ChapProcessCodecID",cppname:"ChapterProcessCodecID",level:5,type:"u",mandatory:!0,minver:1,webm:!1,default:0,description:"Contains the type of the codec used for the processing. A value of 0 means native Matroska processing (to be defined), a value of 1 means the DVD command set is used. More codec IDs can be added later."}],[29555,{name:"Tag",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!1,description:"Element containing elements specific to Tracks/Chapters."}],[29572,{name:"SegmentFilename",level:2,type:"8",minver:1,webm:!1,description:"A filename corresponding to this segment."}],[29766,{name:"AttachmentLink",cppname:"TrackAttachmentLink",level:3,type:"u",minver:1,webm:!1,range:"not 0",description:"The UID of an attachment that is used by this codec."}],[2459272,{name:"CodecName",level:3,type:"8",minver:1,description:"A human-readable string specifying the codec."}],[408125543,{name:"Segment",level:0,type:"m",mandatory:!0,multiple:!0,minver:1,description:"This element contains all other top-level (level 1) elements. Typically a Matroska file is composed of 1 segment."}],[17530,{name:"TagLanguage",level:4,type:"s",mandatory:!0,minver:1,webm:!1,default:"und",description:"Specifies the language of the tag specified, in the Matroska languages form."}],[17827,{name:"TagName",level:4,type:"8",mandatory:!0,minver:1,webm:!1,description:"The name of the Tag that is going to be stored."}],[26568,{name:"SimpleTag",cppname:"TagSimple",level:3,recursive:!0,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!1,description:"Contains general information about the target."}],[25542,{name:"TagAttachmentUID",level:4,type:"u",multiple:!0,minver:1,webm:!1,default:0,description:"A unique ID to identify the Attachment(s) the tags belong to. If the value is 0 at this level, the tags apply to all the attachments in the Segment."}],[25540,{name:"TagChapterUID",level:4,type:"u",multiple:!0,minver:1,webm:!1,default:0,description:"A unique ID to identify the Chapter(s) the tags belong to. If the value is 0 at this level, the tags apply to all chapters in the Segment."}],[25545,{name:"TagEditionUID",level:4,type:"u",multiple:!0,minver:1,webm:!1,default:0,description:"A unique ID to identify the EditionEntry(s) the tags belong to. If the value is 0 at this level, the tags apply to all editions in the Segment."}],[25541,{name:"TagTrackUID",level:4,type:"u",multiple:!0,minver:1,webm:!1,default:0,description:"A unique ID to identify the Track(s) the tags belong to. If the value is 0 at this level, the tags apply to all tracks in the Segment."}],[25546,{name:"TargetType",cppname:"TagTargetType",level:4,type:"s",minver:1,webm:!1,strong:"informational",description:'An  string that can be used to display the logical level of the target like "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc (see TargetType).'}],[26826,{name:"TargetTypeValue",cppname:"TagTargetTypeValue",level:4,type:"u",minver:1,webm:!1,default:50,description:"A number to indicate the logical level of the target (see TargetType)."}],[25536,{name:"Targets",cppname:"TagTargets",level:3,type:"m",mandatory:!0,minver:1,webm:!1,description:"Contain all UIDs where the specified meta data apply. It is empty to describe everything in the segment."}],[307544935,{name:"Tags",level:1,type:"m",multiple:!0,minver:1,webm:!1,description:"Element containing elements specific to Tracks/Chapters. A list of valid tags can be found here."}],[17677,{name:"ChapProcessPrivate",cppname:"ChapterProcessPrivate",level:5,type:"b",minver:1,webm:!1,description:'Some optional data attached to the ChapProcessCodecID information. For ChapProcessCodecID = 1, it is the "DVD level" equivalent.'}],[17278,{name:"ChapCountry",cppname:"ChapterCountry",level:5,type:"s",multiple:!0,minver:1,webm:!1,description:"The countries corresponding to the string, same 2 octets as in Internet domains."}],[17276,{name:"ChapLanguage",cppname:"ChapterLanguage",level:5,type:"s",mandatory:!0,multiple:!0,minver:1,webm:!0,default:"eng",description:"The languages corresponding to the string, in the bibliographic ISO-639-2 form."}],[143,{name:"ChapterTrack",level:4,type:"m",minver:1,webm:!1,description:"List of tracks on which the chapter applies. If this element is not present, all tracks apply"}],[25539,{name:"ChapterPhysicalEquiv",level:4,type:"u",minver:1,webm:!1,description:'Specify the physical equivalent of this ChapterAtom like "DVD" (60) or "SIDE" (50), see complete list of values.'}],[28348,{name:"ChapterSegmentEditionUID",level:4,type:"u",minver:1,webm:!1,range:"not 0",description:"The EditionUID to play from the segment linked in ChapterSegmentUID."}],[28263,{name:"ChapterSegmentUID",level:4,type:"b",minver:1,webm:!1,range:">0",bytesize:16,description:"A segment to play in place of this chapter. Edition ChapterSegmentEditionUID should be used for this segment, otherwise no edition is used."}],[29636,{name:"ChapterUID",level:4,type:"u",mandatory:!0,minver:1,webm:!0,range:"not 0",description:"A unique ID to identify the Chapter."}],[182,{name:"ChapterAtom",level:3,recursive:!0,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!0,description:"Contains the atom information to use as the chapter atom (apply to all tracks)."}],[17885,{name:"EditionFlagOrdered",level:3,type:"u",minver:1,webm:!1,default:0,range:"0-1",description:"Specify if the chapters can be defined multiple times and the order to play them is enforced. (1 bit)"}],[17883,{name:"EditionFlagDefault",level:3,type:"u",mandatory:!0,minver:1,webm:!1,default:0,range:"0-1",description:"If a flag is set (1) the edition should be used as the default one. (1 bit)"}],[17853,{name:"EditionFlagHidden",level:3,type:"u",mandatory:!0,minver:1,webm:!1,default:0,range:"0-1",description:"If an edition is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)"}],[17852,{name:"EditionUID",level:3,type:"u",minver:1,webm:!1,range:"not 0",description:"A unique ID to identify the edition. It's useful for tagging an edition."}],[17849,{name:"EditionEntry",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!0,description:"Contains all information about a segment edition."}],[272869232,{name:"Chapters",level:1,type:"m",minver:1,webm:!0,description:"A system to define basic menus and partition data. For more detailed information, look at the Chapters Explanation."}],[18094,{name:"FileUID",level:3,type:"u",mandatory:!0,minver:1,webm:!1,range:"not 0",description:"Unique ID representing the file, as random as possible."}],[18012,{name:"FileData",level:3,type:"b",mandatory:!0,minver:1,webm:!1,description:"The data of the file."}],[18030,{name:"FileName",level:3,type:"8",mandatory:!0,minver:1,webm:!1,description:"Filename of the attached file."}],[18046,{name:"FileDescription",level:3,type:"8",minver:1,webm:!1,description:"A human-friendly name for the attached file."}],[24999,{name:"AttachedFile",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!1,description:"An attached file."}],[423732329,{name:"Attachments",level:1,type:"m",minver:1,webm:!1,description:"Contain attached files."}],[235,{name:"CueRefCodecState",level:5,type:"u",webm:!1,default:0,description:"The position of the Codec State corresponding to this referenced element. 0 means that the data is taken from the initial Track Entry."}],[21343,{name:"CueRefNumber",level:5,type:"u",webm:!1,default:1,range:"not 0",description:"Number of the referenced Block of Track X in the specified Cluster."}],[219,{name:"CueReference",level:4,type:"m",multiple:!0,minver:2,webm:!1,description:"The Clusters containing the required referenced Blocks."}],[234,{name:"CueCodecState",level:4,type:"u",minver:2,webm:!1,default:0,description:"The position of the Codec State corresponding to this Cue element. 0 means that the data is taken from the initial Track Entry."}],[178,{name:"CueDuration",level:4,type:"u",mandatory:!1,minver:4,webm:!1,description:"The duration of the block according to the segment time base. If missing the track's DefaultDuration does not apply and no duration information is available in terms of the cues."}],[240,{name:"CueRelativePosition",level:4,type:"u",mandatory:!1,minver:4,webm:!1,description:"The relative position of the referenced block inside the cluster with 0 being the first possible position for an element inside that cluster."}],[241,{name:"CueClusterPosition",level:4,type:"u",mandatory:!0,minver:1,description:"The position of the Cluster containing the required Block."}],[247,{name:"CueTrack",level:4,type:"u",mandatory:!0,minver:1,range:"not 0",description:"The track for which a position is given."}],[183,{name:"CueTrackPositions",level:3,type:"m",mandatory:!0,multiple:!0,minver:1,description:"Contain positions for different tracks corresponding to the timestamp."}],[179,{name:"CueTime",level:3,type:"u",mandatory:!0,minver:1,description:"Absolute timestamp according to the segment time base."}],[187,{name:"CuePoint",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,description:"Contains all information relative to a seek point in the segment."}],[475249515,{name:"Cues",level:1,type:"m",minver:1,description:'A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non "live" streams.'}],[18406,{name:"ContentSigHashAlgo",level:6,type:"u",minver:1,webm:!1,default:0,br:["",""],description:"The hash algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - SHA1-160 2 - MD5"}],[18405,{name:"ContentSigAlgo",level:6,type:"u",minver:1,webm:!1,default:0,br:"",description:"The algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - RSA"}],[18404,{name:"ContentSigKeyID",level:6,type:"b",minver:1,webm:!1,description:"This is the ID of the private key the data was signed with."}],[18403,{name:"ContentSignature",level:6,type:"b",minver:1,webm:!1,description:"A cryptographic signature of the contents."}],[18402,{name:"ContentEncKeyID",level:6,type:"b",minver:1,webm:!1,description:"For public key algorithms this is the ID of the public key the the data was encrypted with."}],[18401,{name:"ContentEncAlgo",level:6,type:"u",minver:1,webm:!1,default:0,br:"",description:"The encryption algorithm used. The value '0' means that the contents have not been encrypted but only signed. Predefined values: 1 - DES, 2 - 3DES, 3 - Twofish, 4 - Blowfish, 5 - AES"}],[28032,{name:"ContentEncodings",level:3,type:"m",minver:1,webm:!1,description:"Settings for several content encoding mechanisms like compression or encryption."}],[196,{name:"TrickMasterTrackSegmentUID",level:3,type:"b",divx:!0,bytesize:16,description:"DivX trick track extenstions"}],[199,{name:"TrickMasterTrackUID",level:3,type:"u",divx:!0,description:"DivX trick track extenstions"}],[198,{name:"TrickTrackFlag",level:3,type:"u",divx:!0,default:0,description:"DivX trick track extenstions"}],[193,{name:"TrickTrackSegmentUID",level:3,type:"b",divx:!0,bytesize:16,description:"DivX trick track extenstions"}],[192,{name:"TrickTrackUID",level:3,type:"u",divx:!0,description:"DivX trick track extenstions"}],[237,{name:"TrackJoinUID",level:5,type:"u",mandatory:!0,multiple:!0,minver:3,webm:!1,range:"not 0",description:"The trackUID number of a track whose blocks are used to create this virtual track."}],[233,{name:"TrackJoinBlocks",level:4,type:"m",minver:3,webm:!1,description:"Contains the list of all tracks whose Blocks need to be combined to create this virtual track"}],[230,{name:"TrackPlaneType",level:6,type:"u",mandatory:!0,minver:3,webm:!1,description:"The kind of plane this track corresponds to (0: left eye, 1: right eye, 2: background)."}],[229,{name:"TrackPlaneUID",level:6,type:"u",mandatory:!0,minver:3,webm:!1,range:"not 0",description:"The trackUID number of the track representing the plane."}],[228,{name:"TrackPlane",level:5,type:"m",mandatory:!0,multiple:!0,minver:3,webm:!1,description:"Contains a video plane track that need to be combined to create this 3D track"}],[227,{name:"TrackCombinePlanes",level:4,type:"m",minver:3,webm:!1,description:"Contains the list of all video plane tracks that need to be combined to create this 3D track"}],[226,{name:"TrackOperation",level:3,type:"m",minver:3,webm:!1,description:"Operation that needs to be applied on tracks to create this virtual track. For more details look at the Specification Notes on the subject."}],[32123,{name:"ChannelPositions",cppname:"AudioPosition",level:4,type:"b",webm:!1,description:"Table of horizontal angles for each successive channel, see appendix."}],[159,{name:"Channels",cppname:"AudioChannels",level:4,type:"u",mandatory:!0,minver:1,default:1,range:"not 0",description:"Numbers of channels in the track."}],[30901,{name:"OutputSamplingFrequency",cppname:"AudioOutputSamplingFreq",level:4,type:"f",minver:1,default:"Sampling Frequency",range:"> 0",description:"Real output sampling frequency in Hz (used for SBR techniques)."}],[181,{name:"SamplingFrequency",cppname:"AudioSamplingFreq",level:4,type:"f",mandatory:!0,minver:1,default:"8000.0",range:"> 0",description:"Sampling frequency in Hz."}],[225,{name:"Audio",cppname:"TrackAudio",level:3,type:"m",minver:1,description:"Audio settings."}],[2327523,{name:"FrameRate",cppname:"VideoFrameRate",level:4,type:"f",range:"> 0",strong:"Informational",description:"Number of frames per second.  only."}],[3126563,{name:"GammaValue",cppname:"VideoGamma",level:4,type:"f",webm:!1,range:"> 0",description:"Gamma Value."}],[3061028,{name:"ColourSpace",cppname:"VideoColourSpace",level:4,type:"b",minver:1,webm:!1,bytesize:4,description:"Same value as in AVI (32 bits)."}],[21683,{name:"AspectRatioType",cppname:"VideoAspectRatio",level:4,type:"u",minver:1,default:0,description:"Specify the possible modifications to the aspect ratio (0: free resizing, 1: keep aspect ratio, 2: fixed)."}],[21682,{name:"DisplayUnit",cppname:"VideoDisplayUnit",level:4,type:"u",minver:1,default:0,description:"How DisplayWidth & DisplayHeight should be interpreted (0: pixels, 1: centimeters, 2: inches, 3: Display Aspect Ratio)."}],[21690,{name:"DisplayHeight",cppname:"VideoDisplayHeight",level:4,type:"u",minver:1,default:"PixelHeight",range:"not 0",description:"Height of the video frames to display. The default value is only valid when DisplayUnit is 0."}],[21680,{name:"DisplayWidth",cppname:"VideoDisplayWidth",level:4,type:"u",minver:1,default:"PixelWidth",range:"not 0",description:"Width of the video frames to display. The default value is only valid when DisplayUnit is 0."}],[21725,{name:"PixelCropRight",cppname:"VideoPixelCropRight",level:4,type:"u",minver:1,default:0,description:"The number of video pixels to remove on the right of the image."}],[21708,{name:"PixelCropLeft",cppname:"VideoPixelCropLeft",level:4,type:"u",minver:1,default:0,description:"The number of video pixels to remove on the left of the image."}],[21691,{name:"PixelCropTop",cppname:"VideoPixelCropTop",level:4,type:"u",minver:1,default:0,description:"The number of video pixels to remove at the top of the image."}],[21674,{name:"PixelCropBottom",cppname:"VideoPixelCropBottom",level:4,type:"u",minver:1,default:0,description:"The number of video pixels to remove at the bottom of the image (for HDTV content)."}],[186,{name:"PixelHeight",cppname:"VideoPixelHeight",level:4,type:"u",mandatory:!0,minver:1,range:"not 0",description:"Height of the encoded video frames in pixels."}],[176,{name:"PixelWidth",cppname:"VideoPixelWidth",level:4,type:"u",mandatory:!0,minver:1,range:"not 0",description:"Width of the encoded video frames in pixels."}],[21433,{name:"OldStereoMode",level:4,type:"u",maxver:"0",webm:!1,divx:!1,description:"DEPRECATED, DO NOT USE. Bogus StereoMode value used in old versions of libmatroska. (0: mono, 1: right eye, 2: left eye, 3: both eyes)."}],[21440,{name:"AlphaMode",cppname:"VideoAlphaMode",level:4,type:"u",minver:3,webm:!0,default:0,description:"Alpha Video Mode. Presence of this element indicates that the BlockAdditional element could contain Alpha data."}],[21432,{name:"StereoMode",cppname:"VideoStereoMode",level:4,type:"u",minver:3,webm:!0,default:0,description:"Stereo-3D video mode (0: mono, 1: side by side (left eye is first), 2: top-bottom (right eye is first), 3: top-bottom (left eye is first), 4: checkboard (right is first), 5: checkboard (left is first), 6: row interleaved (right is first), 7: row interleaved (left is first), 8: column interleaved (right is first), 9: column interleaved (left is first), 10: anaglyph (cyan/red), 11: side by side (right eye is first), 12: anaglyph (green/magenta), 13 both eyes laced in one Block (left eye is first), 14 both eyes laced in one Block (right eye is first)) . There are some more details on 3D support in the Specification Notes."}],[154,{name:"FlagInterlaced",cppname:"VideoFlagInterlaced",level:4,type:"u",mandatory:!0,minver:2,webm:!0,default:0,range:"0-1",description:"Set if the video is interlaced. (1 bit)"}],[224,{name:"Video",cppname:"TrackVideo",level:3,type:"m",minver:1,description:"Video settings."}],[26277,{name:"TrackTranslateTrackID",level:4,type:"b",mandatory:!0,minver:1,webm:!1,description:"The binary value used to represent this track in the chapter codec data. The format depends on the ChapProcessCodecID used."}],[26303,{name:"TrackTranslateCodec",level:4,type:"u",mandatory:!0,minver:1,webm:!1,description:"The chapter codec using this ID (0: Matroska Script, 1: DVD-menu)."}],[26364,{name:"TrackTranslateEditionUID",level:4,type:"u",multiple:!0,minver:1,webm:!1,description:"Specify an edition UID on which this translation applies. When not specified, it means for all editions found in the segment."}],[22203,{name:"SeekPreRoll",level:3,type:"u",mandatory:!0,multiple:!1,default:0,minver:4,webm:!0,description:"After a discontinuity, SeekPreRoll is the duration in nanoseconds of the data the decoder must decode before the decoded data is valid."}],[22186,{name:"CodecDelay",level:3,type:"u",multiple:!1,default:0,minver:4,webm:!0,description:"CodecDelay is The codec-built-in delay in nanoseconds. This value must be subtracted from each block timestamp in order to get the actual timestamp. The value should be small so the muxing of tracks with the same actual timestamp are in the same Cluster."}],[28587,{name:"TrackOverlay",level:3,type:"u",multiple:!0,minver:1,webm:!1,description:"Specify that this track is an overlay track for the Track specified (in the u-integer). That means when this track has a gap (see SilentTracks) the overlay track should be used instead. The order of multiple TrackOverlay matters, the first one is the one that should be used. If not found it should be the second, etc."}],[170,{name:"CodecDecodeAll",level:3,type:"u",mandatory:!0,minver:2,webm:!1,default:1,range:"0-1",description:"The codec can decode potentially damaged data (1 bit)."}],[2536e3,{name:"CodecDownloadURL",level:3,type:"s",multiple:!0,webm:!1,description:"A URL to download about the codec used."}],[3883072,{name:"CodecInfoURL",level:3,type:"s",multiple:!0,webm:!1,description:"A URL to find information about the codec used."}],[3839639,{name:"CodecSettings",level:3,type:"8",webm:!1,description:"A string describing the encoding setting used."}],[25506,{name:"CodecPrivate",level:3,type:"b",minver:1,description:"Private data only known to the codec."}],[2274716,{name:"Language",cppname:"TrackLanguage",level:3,type:"s",minver:1,default:"eng",description:"Specifies the language of the track in the Matroska languages form."}],[21358,{name:"Name",cppname:"TrackName",level:3,type:"8",minver:1,description:"A human-readable track name."}],[21998,{name:"MaxBlockAdditionID",level:3,type:"u",mandatory:!0,minver:1,webm:!1,default:0,description:"The maximum value of BlockAdditions for this track."}],[21375,{name:"TrackOffset",level:3,type:"i",webm:!1,default:0,description:"A value to add to the Block's Timestamp. This can be used to adjust the playback offset of a track."}],[2306383,{name:"TrackTimecodeScale",level:3,type:"f",mandatory:!0,minver:1,maxver:"3",webm:!1,default:"1.0",range:"> 0",description:"DEPRECATED, DO NOT USE. The scale to apply on this track to work at normal speed in relation with other tracks (mostly used to adjust video speed when the audio length differs)."}],[2313850,{name:"DefaultDecodedFieldDuration",cppname:"TrackDefaultDecodedFieldDuration",level:3,type:"u",minver:4,range:"not 0",description:"The period in nanoseconds (not scaled by TimcodeScale)\nbetween two successive fields at the output of the decoding process (see the notes)"}],[2352003,{name:"DefaultDuration",cppname:"TrackDefaultDuration",level:3,type:"u",minver:1,range:"not 0",description:"Number of nanoseconds (not scaled via TimecodeScale) per frame ('frame' in the Matroska sense -- one element put into a (Simple)Block)."}],[28152,{name:"MaxCache",cppname:"TrackMaxCache",level:3,type:"u",minver:1,webm:!1,description:"The maximum cache size required to store referenced frames in and the current frame. 0 means no cache is needed."}],[28135,{name:"MinCache",cppname:"TrackMinCache",level:3,type:"u",mandatory:!0,minver:1,webm:!1,default:0,description:"The minimum number of frames a player should be able to cache during playback. If set to 0, the reference pseudo-cache system is not used."}],[156,{name:"FlagLacing",cppname:"TrackFlagLacing",level:3,type:"u",mandatory:!0,minver:1,default:1,range:"0-1",description:"Set if the track may contain blocks using lacing. (1 bit)"}],[21930,{name:"FlagForced",cppname:"TrackFlagForced",level:3,type:"u",mandatory:!0,minver:1,default:0,range:"0-1",description:"Set if that track MUST be active during playback. There can be many forced track for a kind (audio, video or subs), the player should select the one which language matches the user preference or the default + forced track. Overlay MAY happen between a forced and non-forced track of the same kind. (1 bit)"}],[185,{name:"FlagEnabled",cppname:"TrackFlagEnabled",level:3,type:"u",mandatory:!0,minver:2,webm:!0,default:1,range:"0-1",description:"Set if the track is usable. (1 bit)"}],[29637,{name:"TrackUID",level:3,type:"u",mandatory:!0,minver:1,range:"not 0",description:"A unique ID to identify the Track. This should be kept the same when making a direct stream copy of the Track to another file."}],[215,{name:"TrackNumber",level:3,type:"u",mandatory:!0,minver:1,range:"not 0",description:"The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number)."}],[174,{name:"TrackEntry",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,description:"Describes a track with all elements."}],[374648427,{name:"Tracks",level:1,type:"m",multiple:!0,minver:1,description:"A top-level block of information with many tracks described."}],[175,{name:"EncryptedBlock",level:2,type:"b",multiple:!0,webm:!1,description:"Similar to EncryptedBlock Structure)"}],[202,{name:"ReferenceTimeCode",level:4,type:"u",multiple:!1,mandatory:!0,minver:0,webm:!1,divx:!0,description:"DivX trick track extenstions"}],[201,{name:"ReferenceOffset",level:4,type:"u",multiple:!1,mandatory:!0,minver:0,webm:!1,divx:!0,description:"DivX trick track extenstions"}],[200,{name:"ReferenceFrame",level:3,type:"m",multiple:!1,minver:0,webm:!1,divx:!0,description:"DivX trick track extenstions"}],[207,{name:"SliceDuration",level:5,type:"u",default:0,description:"The (scaled) duration to apply to the element."}],[206,{name:"Delay",cppname:"SliceDelay",level:5,type:"u",default:0,description:"The (scaled) delay to apply to the element."}],[203,{name:"BlockAdditionID",cppname:"SliceBlockAddID",level:5,type:"u",default:0,description:"The ID of the BlockAdditional element (0 is the main Block)."}],[205,{name:"FrameNumber",cppname:"SliceFrameNumber",level:5,type:"u",default:0,description:"The number of the frame to generate from this lace with this delay (allow you to generate many frames from the same Block/Frame)."}],[204,{name:"LaceNumber",cppname:"SliceLaceNumber",level:5,type:"u",minver:1,default:0,divx:!1,description:"The reverse number of the frame in the lace (0 is the last frame, 1 is the next to last, etc). While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback."}],[232,{name:"TimeSlice",level:4,type:"m",multiple:!0,minver:1,divx:!1,description:"Contains extra time information about the data contained in the Block. While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback."}],[142,{name:"Slices",level:3,type:"m",minver:1,divx:!1,description:"Contains slices description."}],[30114,{name:"DiscardPadding",level:3,type:"i",minver:4,webm:!0,description:"Duration in nanoseconds of the silent data added to the Block (padding at the end of the Block for positive value, at the beginning of the Block for negative value). The duration of DiscardPadding is not calculated in the duration of the TrackEntry and should be discarded during playback."}],[164,{name:"CodecState",level:3,type:"b",minver:2,webm:!1,description:"The new codec state to use. Data interpretation is private to the codec. This information should always be referenced by a seek entry."}],[253,{name:"ReferenceVirtual",level:3,type:"i",webm:!1,description:"Relative position of the data that should be in position of the virtual block."}],[251,{name:"ReferenceBlock",level:3,type:"i",multiple:!0,minver:1,description:"Timestamp of another frame used as a reference (ie: B or P frame). The timestamp is relative to the block it's attached to."}],[250,{name:"ReferencePriority",cppname:"FlagReferenced",level:3,type:"u",mandatory:!0,minver:1,webm:!1,default:0,description:"This frame is referenced and has the specified cache priority. In cache only a frame of the same or higher priority can replace this frame. A value of 0 means the frame is not referenced."}],[155,{name:"BlockDuration",level:3,type:"u",minver:1,default:"TrackDuration",description:'The duration of the Block (based on TimecodeScale). This element is mandatory when DefaultDuration is set for the track (but can be omitted as other default values). When not written and with no DefaultDuration, the value is assumed to be the difference between the timestamp of this Block and the timestamp of the next Block in "display" order (not coding order). This element can be useful at the end of a Track (as there is not other Block available), or when there is a break in a track like for subtitle tracks. When set to 0 that means the frame is not a keyframe.'}],[165,{name:"BlockAdditional",level:5,type:"b",mandatory:!0,minver:1,webm:!1,description:"Interpreted by the codec as it wishes (using the BlockAddID)."}],[238,{name:"BlockAddID",level:5,type:"u",mandatory:!0,minver:1,webm:!1,default:1,range:"not 0",description:"An ID to identify the BlockAdditional level."}],[166,{name:"BlockMore",level:4,type:"m",mandatory:!0,multiple:!0,minver:1,webm:!1,description:"Contain the BlockAdditional and some parameters."}],[30113,{name:"BlockAdditions",level:3,type:"m",minver:1,webm:!1,description:"Contain additional blocks to complete the main one. An EBML parser that has no knowledge of the Block structure could still see and use/skip these data."}],[162,{name:"BlockVirtual",level:3,type:"b",webm:!1,description:"A Block with no data. It must be stored in the stream at the place the real Block should be in display order. (see Block Virtual)"}],[161,{name:"Block",level:3,type:"b",mandatory:!0,minver:1,description:"Block containing the actual data to be rendered and a timestamp relative to the Cluster Timecode. (see Block Structure)"}],[160,{name:"BlockGroup",level:2,type:"m",multiple:!0,minver:1,description:"Basic container of information containing a single Block or BlockVirtual, and information specific to that Block/VirtualBlock."}],[163,{name:"SimpleBlock",level:2,type:"b",multiple:!0,minver:2,webm:!0,divx:!0,description:"Similar to SimpleBlock Structure)"}],[171,{name:"PrevSize",cppname:"ClusterPrevSize",level:2,type:"u",minver:1,description:"Size of the previous Cluster, in octets. Can be useful for backward playing."}],[167,{name:"Position",cppname:"ClusterPosition",level:2,type:"u",minver:1,webm:!1,description:"The Position of the Cluster in the segment (0 in live broadcast streams). It might help to resynchronise offset on damaged streams."}],[22743,{name:"SilentTrackNumber",cppname:"ClusterSilentTrackNumber",level:3,type:"u",multiple:!0,minver:1,webm:!1,description:"One of the track number that are not used from now on in the stream. It could change later if not specified as silent in a further Cluster."}],[231,{name:"Timecode",cppname:"ClusterTimecode",level:2,type:"u",mandatory:!0,minver:1,description:"Absolute timestamp of the cluster (based on TimecodeScale)."}],[524531317,{name:"Cluster",level:1,type:"m",multiple:!0,minver:1,description:"The lower level element containing the (monolithic) Block structure."}],[19840,{name:"MuxingApp",level:2,type:"8",mandatory:!0,minver:1,description:'Muxing application or library ("libmatroska-0.4.3").'}],[31657,{name:"Title",level:2,type:"8",minver:1,webm:!1,description:"General name of the segment."}],[2807730,{name:"TimecodeScaleDenominator",level:2,type:"u",mandatory:!0,minver:4,default:1e9,description:"Timestamp scale numerator, see TimecodeScale."}],[2807729,{name:"TimecodeScale",level:2,type:"u",mandatory:!0,minver:1,default:1e6,description:"Timestamp scale in nanoseconds (1.000.000 means all timestamps in the segment are expressed in milliseconds)."}],[27045,{name:"ChapterTranslateID",level:3,type:"b",mandatory:!0,minver:1,webm:!1,description:"The binary value used to represent this segment in the chapter codec data. The format depends on the ChapProcessCodecID used."}],[27071,{name:"ChapterTranslateCodec",level:3,type:"u",mandatory:!0,minver:1,webm:!1,description:"The chapter codec using this ID (0: Matroska Script, 1: DVD-menu)."}],[27132,{name:"ChapterTranslateEditionUID",level:3,type:"u",multiple:!0,minver:1,webm:!1,description:"Specify an edition UID on which this correspondance applies. When not specified, it means for all editions found in the segment."}],[4096955,{name:"NextFilename",level:2,type:"8",minver:1,webm:!1,description:"An escaped filename corresponding to the next segment."}],[4110627,{name:"NextUID",level:2,type:"b",minver:1,webm:!1,bytesize:16,description:"A unique ID to identify the next chained segment (128 bits)."}],[3965867,{name:"PrevFilename",level:2,type:"8",minver:1,webm:!1,description:"An escaped filename corresponding to the previous segment."}],[3979555,{name:"PrevUID",level:2,type:"b",minver:1,webm:!1,bytesize:16,description:"A unique ID to identify the previous chained segment (128 bits)."}],[29604,{name:"SegmentUID",level:2,type:"b",minver:1,webm:!1,range:"not 0",bytesize:16,description:"A randomly generated unique ID to identify the current segment between many others (128 bits)."}],[357149030,{name:"Info",level:1,type:"m",mandatory:!0,multiple:!0,minver:1,description:"Contains miscellaneous general information and statistics on the file."}],[21420,{name:"SeekPosition",level:3,type:"u",mandatory:!0,minver:1,description:"The position of the element in the segment in octets (0 = first level 1 element)."}],[21419,{name:"SeekID",level:3,type:"b",mandatory:!0,minver:1,description:"The binary ID corresponding to the element name."}],[19899,{name:"Seek",cppname:"SeekPoint",level:2,type:"m",mandatory:!0,multiple:!0,minver:1,description:"Contains a single seek entry to an EBML element."}],[290298740,{name:"SeekHead",cppname:"SeekHeader",level:1,type:"m",multiple:!0,minver:1,description:"Contains the position of other level 1 elements."}],[32379,{name:"SignatureElementList",level:2,type:"m",multiple:!0,webm:!1,i:"Cluster|Block|BlockAdditional",description:"A list consists of a number of consecutive elements that represent one case where data is used in signature. 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o=Li(n);o||n.corked||n.bufferProcessing||!n.bufferedRequest||Ri(e,n),r?br(xi,e,n,o,i):xi(e,n,o,i)}}(t,e)},this.writecb=null,this.writelen=0,this.bufferedRequest=null,this.lastBufferedRequest=null,this.pendingcb=0,this.prefinished=!1,this.errorEmitted=!1,this.bufferedRequestCount=0,this.corkedRequestsFree=new Bi(this)}function _i(e){if(!(this instanceof _i||this instanceof Fi))return new _i(e);this._writableState=new Ei(e,this),this.writable=!0,e&&("function"==typeof e.write&&(this._write=e.write),"function"==typeof e.writev&&(this._writev=e.writev)),nr.call(this)}function Ai(e,t,n,r,i,o,a){t.writelen=r,t.writecb=a,t.writing=!0,t.sync=!0,n?e._writev(i,t.onwrite):e._write(i,o,t.onwrite),t.sync=!1}function xi(e,t,n,r){n||function(e,t){0===t.length&&t.needDrain&&(t.needDrain=!1,e.emit("drain"))}(e,t),t.pendingcb--,r(),Di(e,t)}function Ri(e,t){t.bufferProcessing=!0;var n=t.bufferedRequest;if(e._writev&&n&&n.next){var r=t.bufferedRequestCount,i=new Array(r),o=t.corkedRequestsFree;o.entry=n;for(var a=0;n;)i[a]=n,n=n.next,a+=1;Ai(e,t,!0,t.length,i,"",o.finish),t.pendingcb++,t.lastBufferedRequest=null,o.next?(t.corkedRequestsFree=o.next,o.next=null):t.corkedRequestsFree=new Bi(t)}else{for(;n;){var s=n.chunk,u=n.encoding,l=n.callback;if(Ai(e,t,!1,t.objectMode?1:s.length,s,u,l),n=n.next,t.writing)break}null===n&&(t.lastBufferedRequest=null)}t.bufferedRequestCount=0,t.bufferedRequest=n,t.bufferProcessing=!1}function Li(e){return e.ending&&0===e.length&&null===e.bufferedRequest&&!e.finished&&!e.writing}function Mi(e,t){t.prefinished||(t.prefinished=!0,e.emit("prefinish"))}function Di(e,t){var n=Li(t);return n&&(0===t.pendingcb?(Mi(e,t),t.finished=!0,e.emit("finish")):Mi(e,t)),n}function Bi(e){var t=this;this.next=null,this.entry=null,this.finish=function(n){var r=t.entry;for(t.entry=null;r;){var i=r.callback;e.pendingcb--,i(n),r=r.next}e.corkedRequestsFree?e.corkedRequestsFree.next=t:e.corkedRequestsFree=t}}fi.prototype.read=function(e){ui("read",e),e=parseInt(e,10);var t=this._readableState,n=e;if(0!==e&&(t.emittedReadable=!1),0===e&&t.needReadable&&(t.length>=t.highWaterMark||t.ended))return ui("read: emitReadable",t.length,t.ended),0===t.length&&t.ended?wi(this):di(this),null;if(0===(e=hi(e,t))&&t.ended)return 0===t.length&&wi(this),null;var r,i=t.needReadable;return ui("need readable",i),(0===t.length||t.length-e<t.highWaterMark)&&ui("length less than watermark",i=!0),t.ended||t.reading?ui("reading or ended",i=!1):i&&(ui("do read"),t.reading=!0,t.sync=!0,0===t.length&&(t.needReadable=!0),this._read(t.highWaterMark),t.sync=!1,t.reading||(e=hi(n,t))),null===(r=e>0?bi(e,t):null)?(t.needReadable=!0,e=0):t.length-=e,0===t.length&&(t.ended||(t.needReadable=!0),n!==e&&t.ended&&wi(this)),null!==r&&this.emit("data",r),r},fi.prototype._read=function(e){this.emit("error",new Error("not implemented"))},fi.prototype.pipe=function(e,t){var n=this,r=this._readableState;switch(r.pipesCount){case 0:r.pipes=e;break;case 1:r.pipes=[r.pipes,e];break;default:r.pipes.push(e)}r.pipesCount+=1,ui("pipe count=%d opts=%j",r.pipesCount,t);var i=t&&!1===t.end?l:a;function o(e){ui("onunpipe"),e===n&&l()}function a(){ui("onend"),e.end()}r.endEmitted?br(i):n.once("end",i),e.on("unpipe",o);var s=function(e){return function(){var t=e._readableState;ui("pipeOnDrain",t.awaitDrain),t.awaitDrain&&t.awaitDrain--,0===t.awaitDrain&&e.listeners("data").length&&(t.flowing=!0,vi(e))}}(n);e.on("drain",s);var u=!1;function l(){ui("cleanup"),e.removeListener("close",d),e.removeListener("finish",p),e.removeListener("drain",s),e.removeListener("error",h),e.removeListener("unpipe",o),n.removeListener("end",a),n.removeListener("end",l),n.removeListener("data",c),u=!0,!r.awaitDrain||e._writableState&&!e._writableState.needDrain||s()}var f=!1;function c(t){ui("ondata"),f=!1,!1!==e.write(t)||f||((1===r.pipesCount&&r.pipes===e||r.pipesCount>1&&-1!==Si(r.pipes,e))&&!u&&(ui("false write response, pause",n._readableState.awaitDrain),n._readableState.awaitDrain++,f=!0),n.pause())}function h(t){ui("onerror",t),m(),e.removeListener("error",h),0===("error",e.listeners("error").length)&&e.emit("error",t)}function d(){e.removeListener("finish",p),m()}function p(){ui("onfinish"),e.removeListener("close",d),m()}function m(){ui("unpipe"),n.unpipe(e)}return n.on("data",c),function(e,t,n){if("function"==typeof e.prependListener)return e.prependListener("error",n);e._events&&e._events.error?Array.isArray(e._events.error)?e._events.error.unshift(n):e._events.error=[n,e._events.error]:e.on("error",n)}(e,0,h),e.once("close",d),e.once("finish",p),e.emit("pipe",n),r.flowing||(ui("pipe resume"),n.resume()),e},fi.prototype.unpipe=function(e){var t=this._readableState;if(0===t.pipesCount)return this;if(1===t.pipesCount)return e&&e!==t.pipes||(e||(e=t.pipes),t.pipes=null,t.pipesCount=0,t.flowing=!1,e&&e.emit("unpipe",this)),this;if(!e){var n=t.pipes,r=t.pipesCount;t.pipes=null,t.pipesCount=0,t.flowing=!1;for(var i=0;i<r;i++)n[i].emit("unpipe",this);return this}var o=Si(t.pipes,e);return-1===o||(t.pipes.splice(o,1),t.pipesCount-=1,1===t.pipesCount&&(t.pipes=t.pipes[0]),e.emit("unpipe",this)),this},fi.prototype.on=function(e,t){var n=nr.prototype.on.call(this,e,t);if("data"===e)!1!==this._readableState.flowing&&this.resume();else if("readable"===e){var r=this._readableState;r.endEmitted||r.readableListening||(r.readableListening=r.needReadable=!0,r.emittedReadable=!1,r.reading?r.length&&di(this):br(gi,this))}return n},fi.prototype.addListener=fi.prototype.on,fi.prototype.resume=function(){var e=this._readableState;return e.flowing||(ui("resume"),e.flowing=!0,function(e,t){t.resumeScheduled||(t.resumeScheduled=!0,br(yi,e,t))}(this,e)),this},fi.prototype.pause=function(){return ui("call pause 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t},_i.prototype.pipe=function(){this.emit("error",new Error("Cannot pipe, not readable"))},_i.prototype.write=function(e,t,n){var r=this._writableState,i=!1;return"function"==typeof t&&(n=t,t=null),g.isBuffer(e)?t="buffer":t||(t=r.defaultEncoding),"function"!=typeof n&&(n=Ti),r.ended?function(e,t){var n=new Error("write after end");e.emit("error",n),br(t,n)}(this,n):function(e,t,n,r){var i=!0,o=!1;return null===n?o=new TypeError("May not write null values to stream"):g.isBuffer(n)||"string"==typeof n||void 0===n||t.objectMode||(o=new TypeError("Invalid non-string/buffer chunk")),o&&(e.emit("error",o),br(r,o),i=!1),i}(this,r,e,n)&&(r.pendingcb++,i=function(e,t,n,r,i){n=function(e,t,n){return e.objectMode||!1===e.decodeStrings||"string"!=typeof t||(t=g.from(t,n)),t}(t,n,r),g.isBuffer(n)&&(r="buffer");var o=t.objectMode?1:n.length;t.length+=o;var a=t.length<t.highWaterMark;if(a||(t.needDrain=!0),t.writing||t.corked){var s=t.lastBufferedRequest;t.lastBufferedRequest=new Ci(n,r,i),s?s.next=t.lastBufferedRequest:t.bufferedRequest=t.lastBufferedRequest,t.bufferedRequestCount+=1}else Ai(e,t,!1,o,n,r,i);return a}(this,r,e,t,n)),i},_i.prototype.cork=function(){this._writableState.corked++},_i.prototype.uncork=function(){var e=this._writableState;e.corked&&(e.corked--,e.writing||e.corked||e.finished||e.bufferProcessing||!e.bufferedRequest||Ri(this,e))},_i.prototype.setDefaultEncoding=function(e){if("string"==typeof e&&(e=e.toLowerCase()),!(["hex","utf8","utf-8","ascii","binary","base64","ucs2","ucs-2","utf16le","utf-16le","raw"].indexOf((e+"").toLowerCase())>-1))throw new TypeError("Unknown encoding: "+e);return this._writableState.defaultEncoding=e,this},_i.prototype._write=function(e,t,n){n(new Error("not implemented"))},_i.prototype._writev=null,_i.prototype.end=function(e,t,n){var r=this._writableState;"function"==typeof e?(n=e,e=null,t=null):"function"==typeof t&&(n=t,t=null),null!=e&&this.write(e,t),r.corked&&(r.corked=1,this.uncork()),r.ending||r.finished||function(e,t,n){t.ending=!0,Di(e,t),n&&(t.finished?br(n):e.once("finish",n)),t.ended=!0,e.writable=!1}(this,r,n)},Br(Fi,fi);for(var Ii=Object.keys(_i.prototype),Oi=0;Oi<Ii.length;Oi++){var Pi=Ii[Oi];Fi.prototype[Pi]||(Fi.prototype[Pi]=_i.prototype[Pi])}function Fi(e){if(!(this instanceof Fi))return new Fi(e);fi.call(this,e),_i.call(this,e),e&&!1===e.readable&&(this.readable=!1),e&&!1===e.writable&&(this.writable=!1),this.allowHalfOpen=!0,e&&!1===e.allowHalfOpen&&(this.allowHalfOpen=!1),this.once("end",Ui)}function Ui(){this.allowHalfOpen||this._writableState.ended||br(ji,this)}function ji(e){e.end()}function Ni(e){this.afterTransform=function(t,n){return function(e,t,n){var r=e._transformState;r.transforming=!1;var i=r.writecb;if(!i)return e.emit("error",new Error("no writecb in Transform class"));r.writechunk=null,r.writecb=null,null!=n&&e.push(n),i(t);var o=e._readableState;o.reading=!1,(o.needReadable||o.length<o.highWaterMark)&&e._read(o.highWaterMark)}(e,t,n)},this.needTransform=!1,this.transforming=!1,this.writecb=null,this.writechunk=null,this.writeencoding=null}function qi(e){if(!(this instanceof qi))return new qi(e);Fi.call(this,e),this._transformState=new Ni(this);var t=this;this._readableState.needReadable=!0,this._readableState.sync=!1,e&&("function"==typeof e.transform&&(this._transform=e.transform),"function"==typeof e.flush&&(this._flush=e.flush)),this.once("prefinish",(function(){"function"==typeof this._flush?this._flush((function(e){zi(t,e)})):zi(t)}))}function zi(e,t){if(t)return e.emit("error",t);var n=e._writableState,r=e._transformState;if(n.length)throw new Error("Calling transform done when ws.length != 0");if(r.transforming)throw new Error("Calling transform done when still transforming");return e.push(null)}function Wi(e){if(!(this instanceof Wi))return new Wi(e);qi.call(this,e)}function Vi(){nr.call(this)}Br(qi,Fi),qi.prototype.push=function(e,t){return this._transformState.needTransform=!1,Fi.prototype.push.call(this,e,t)},qi.prototype._transform=function(e,t,n){throw new Error("Not implemented")},qi.prototype._write=function(e,t,n){var r=this._transformState;if(r.writecb=n,r.writechunk=e,r.writeencoding=t,!r.transforming){var i=this._readableState;(r.needTransform||i.needReadable||i.length<i.highWaterMark)&&this._read(i.highWaterMark)}},qi.prototype._read=function(e){var t=this._transformState;null!==t.writechunk&&t.writecb&&!t.transforming?(t.transforming=!0,this._transform(t.writechunk,t.writeencoding,t.afterTransform)):t.needTransform=!0},Br(Wi,qi),Wi.prototype._transform=function(e,t,n){n(null,e)},Br(Vi,nr),Vi.Readable=fi,Vi.Writable=_i,Vi.Duplex=Fi,Vi.Transform=qi,Vi.PassThrough=Wi,Vi.Stream=Vi,Vi.prototype.pipe=function(e,t){var n=this;function r(t){e.writable&&!1===e.write(t)&&n.pause&&n.pause()}function i(){n.readable&&n.resume&&n.resume()}n.on("data",r),e.on("drain",i),e._isStdio||t&&!1===t.end||(n.on("end",a),n.on("close",s));var o=!1;function a(){o||(o=!0,e.end())}function s(){o||(o=!0,"function"==typeof e.destroy&&e.destroy())}function u(e){if(l(),0===nr.listenerCount(this,"error"))throw e}function l(){n.removeListener("data",r),e.removeListener("drain",i),n.removeListener("end",a),n.removeListener("close",s),n.removeListener("error",u),e.removeListener("error",u),n.removeListener("end",l),n.removeListener("close",l),e.removeListener("close",l)}return n.on("error",u),e.on("error",u),n.on("end",l),n.on("close",l),e.on("close",l),e.emit("pipe",n),e};var Yi,Hi,Gi=Fe("ebml:decoder"),Xi=function(e){function t(){var e,n=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};return Q(this,t),ne(se(se(e=ue(this,oe(t).call(this,re({},n,{readableObjectMode:!0}))))),"mBuffer",null),ne(se(se(e)),"mTagStack",[]),ne(se(se(e)),"mState",1),ne(se(se(e)),"mCursor",0),ne(se(se(e)),"mTotal",0),e}return ie(t,qi),te(t,[{key:"_transform",value:function(e,t,n){for(this.buffer?this.buffer=ln.concatenate(this.buffer,g.from(e)):this.buffer=g.from(e);this.cursor<this.buffer.length&&(1!==this.state||this.readTag())&&(2!==this.state||this.readSize())&&(3!==this.state||this.readContent()););n()}},{key:"readTag",value:function(){if(Gi.enabled&&Gi("parsing tag"),this.cursor>=this.buffer.length)return Gi.enabled&&Gi("waiting for more data"),!1;var e=this.total,n=ln.readVint(this.buffer,this.cursor);if(null==n)return Gi.enabled&&Gi("waiting for more data"),!1;var r=ln.readHexString(this.buffer,this.cursor,this.cursor+n.length),i=Number.parseInt(r,16);this.cursor+=n.length,this.total+=n.length,this.state=2;var o={tag:n.value,tagStr:r,type:t.getSchemaInfo(i).type,name:t.getSchemaInfo(i).name,start:e,end:e+n.length};return this.tagStack.push(o),Gi.enabled&&Gi("read tag: ".concat(r)),!0}},{key:"readSize",value:function(){var e=this.tagStack[this.tagStack.length-1];if(Gi.enabled&&Gi("parsing size for tag: ".concat(e.tagStr)),this.cursor>=this.buffer.length)return Gi.enabled&&Gi("waiting for more data"),!1;var t=ln.readVint(this.buffer,this.cursor);return null==t?(Gi.enabled&&Gi("waiting for more data"),!1):(this.cursor+=t.length,this.total+=t.length,this.state=3,e.dataSize=t.value,-1===t.value?e.end=-1:e.end+=t.value+t.length,Gi.enabled&&Gi("read size: ".concat(t.value)),!0)}},{key:"readContent",value:function(){var e=this.tagStack[this.tagStack.length-1],t=e.tagStr,n=e.type,r=e.dataSize,i=ae(e,["tagStr","type","dataSize"]);if(Gi.enabled&&Gi("parsing content for tag: ".concat(t)),"m"===n)return Gi.enabled&&Gi("content should be 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diff --git a/index2.js b/index2.js
deleted file mode 100644
index b5f0413..0000000
--- a/index2.js
+++ /dev/null
@@ -1,16491 +0,0 @@
-(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
-'use strict'
-
-exports.byteLength = byteLength
-exports.toByteArray = toByteArray
-exports.fromByteArray = fromByteArray
-
-var lookup = []
-var revLookup = []
-var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
-
-var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-for (var i = 0, len = code.length; i < len; ++i) {
-  lookup[i] = code[i]
-  revLookup[code.charCodeAt(i)] = i
-}
-
-// Support decoding URL-safe base64 strings, as Node.js does.
-// See: https://en.wikipedia.org/wiki/Base64#URL_applications
-revLookup['-'.charCodeAt(0)] = 62
-revLookup['_'.charCodeAt(0)] = 63
-
-function getLens (b64) {
-  var len = b64.length
-
-  if (len % 4 > 0) {
-    throw new Error('Invalid string. Length must be a multiple of 4')
-  }
-
-  // Trim off extra bytes after placeholder bytes are found
-  // See: https://github.com/beatgammit/base64-js/issues/42
-  var validLen = b64.indexOf('=')
-  if (validLen === -1) validLen = len
-
-  var placeHoldersLen = validLen === len
-    ? 0
-    : 4 - (validLen % 4)
-
-  return [validLen, placeHoldersLen]
-}
-
-// base64 is 4/3 + up to two characters of the original data
-function byteLength (b64) {
-  var lens = getLens(b64)
-  var validLen = lens[0]
-  var placeHoldersLen = lens[1]
-  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
-}
-
-function _byteLength (b64, validLen, placeHoldersLen) {
-  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
-}
-
-function toByteArray (b64) {
-  var tmp
-  var lens = getLens(b64)
-  var validLen = lens[0]
-  var placeHoldersLen = lens[1]
-
-  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
-
-  var curByte = 0
-
-  // if there are placeholders, only get up to the last complete 4 chars
-  var len = placeHoldersLen > 0
-    ? validLen - 4
-    : validLen
-
-  var i
-  for (i = 0; i < len; i += 4) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 18) |
-      (revLookup[b64.charCodeAt(i + 1)] << 12) |
-      (revLookup[b64.charCodeAt(i + 2)] << 6) |
-      revLookup[b64.charCodeAt(i + 3)]
-    arr[curByte++] = (tmp >> 16) & 0xFF
-    arr[curByte++] = (tmp >> 8) & 0xFF
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  if (placeHoldersLen === 2) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 2) |
-      (revLookup[b64.charCodeAt(i + 1)] >> 4)
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  if (placeHoldersLen === 1) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 10) |
-      (revLookup[b64.charCodeAt(i + 1)] << 4) |
-      (revLookup[b64.charCodeAt(i + 2)] >> 2)
-    arr[curByte++] = (tmp >> 8) & 0xFF
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  return arr
-}
-
-function tripletToBase64 (num) {
-  return lookup[num >> 18 & 0x3F] +
-    lookup[num >> 12 & 0x3F] +
-    lookup[num >> 6 & 0x3F] +
-    lookup[num & 0x3F]
-}
-
-function encodeChunk (uint8, start, end) {
-  var tmp
-  var output = []
-  for (var i = start; i < end; i += 3) {
-    tmp =
-      ((uint8[i] << 16) & 0xFF0000) +
-      ((uint8[i + 1] << 8) & 0xFF00) +
-      (uint8[i + 2] & 0xFF)
-    output.push(tripletToBase64(tmp))
-  }
-  return output.join('')
-}
-
-function fromByteArray (uint8) {
-  var tmp
-  var len = uint8.length
-  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
-  var parts = []
-  var maxChunkLength = 16383 // must be multiple of 3
-
-  // go through the array every three bytes, we'll deal with trailing stuff later
-  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
-    parts.push(encodeChunk(
-      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)
-    ))
-  }
-
-  // pad the end with zeros, but make sure to not forget the extra bytes
-  if (extraBytes === 1) {
-    tmp = uint8[len - 1]
-    parts.push(
-      lookup[tmp >> 2] +
-      lookup[(tmp << 4) & 0x3F] +
-      '=='
-    )
-  } else if (extraBytes === 2) {
-    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
-    parts.push(
-      lookup[tmp >> 10] +
-      lookup[(tmp >> 4) & 0x3F] +
-      lookup[(tmp << 2) & 0x3F] +
-      '='
-    )
-  }
-
-  return parts.join('')
-}
-
-},{}],2:[function(require,module,exports){
-
-},{}],3:[function(require,module,exports){
-(function (Buffer){
-/*!
- * The buffer module from node.js, for the browser.
- *
- * @author   Feross Aboukhadijeh <https://feross.org>
- * @license  MIT
- */
-/* eslint-disable no-proto */
-
-'use strict'
-
-var base64 = require('base64-js')
-var ieee754 = require('ieee754')
-
-exports.Buffer = Buffer
-exports.SlowBuffer = SlowBuffer
-exports.INSPECT_MAX_BYTES = 50
-
-var K_MAX_LENGTH = 0x7fffffff
-exports.kMaxLength = K_MAX_LENGTH
-
-/**
- * If `Buffer.TYPED_ARRAY_SUPPORT`:
- *   === true    Use Uint8Array implementation (fastest)
- *   === false   Print warning and recommend using `buffer` v4.x which has an Object
- *               implementation (most compatible, even IE6)
- *
- * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
- * Opera 11.6+, iOS 4.2+.
- *
- * We report that the browser does not support typed arrays if the are not subclassable
- * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
- * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
- * for __proto__ and has a buggy typed array implementation.
- */
-Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
-
-if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
-    typeof console.error === 'function') {
-  console.error(
-    'This browser lacks typed array (Uint8Array) support which is required by ' +
-    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
-  )
-}
-
-function typedArraySupport () {
-  // Can typed array instances can be augmented?
-  try {
-    var arr = new Uint8Array(1)
-    arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
-    return arr.foo() === 42
-  } catch (e) {
-    return false
-  }
-}
-
-Object.defineProperty(Buffer.prototype, 'parent', {
-  enumerable: true,
-  get: function () {
-    if (!Buffer.isBuffer(this)) return undefined
-    return this.buffer
-  }
-})
-
-Object.defineProperty(Buffer.prototype, 'offset', {
-  enumerable: true,
-  get: function () {
-    if (!Buffer.isBuffer(this)) return undefined
-    return this.byteOffset
-  }
-})
-
-function createBuffer (length) {
-  if (length > K_MAX_LENGTH) {
-    throw new RangeError('The value "' + length + '" is invalid for option "size"')
-  }
-  // Return an augmented `Uint8Array` instance
-  var buf = new Uint8Array(length)
-  buf.__proto__ = Buffer.prototype
-  return buf
-}
-
-/**
- * The Buffer constructor returns instances of `Uint8Array` that have their
- * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
- * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
- * and the `Uint8Array` methods. Square bracket notation works as expected -- it
- * returns a single octet.
- *
- * The `Uint8Array` prototype remains unmodified.
- */
-
-function Buffer (arg, encodingOrOffset, length) {
-  // Common case.
-  if (typeof arg === 'number') {
-    if (typeof encodingOrOffset === 'string') {
-      throw new TypeError(
-        'The "string" argument must be of type string. Received type number'
-      )
-    }
-    return allocUnsafe(arg)
-  }
-  return from(arg, encodingOrOffset, length)
-}
-
-// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
-if (typeof Symbol !== 'undefined' && Symbol.species != null &&
-    Buffer[Symbol.species] === Buffer) {
-  Object.defineProperty(Buffer, Symbol.species, {
-    value: null,
-    configurable: true,
-    enumerable: false,
-    writable: false
-  })
-}
-
-Buffer.poolSize = 8192 // not used by this implementation
-
-function from (value, encodingOrOffset, length) {
-  if (typeof value === 'string') {
-    return fromString(value, encodingOrOffset)
-  }
-
-  if (ArrayBuffer.isView(value)) {
-    return fromArrayLike(value)
-  }
-
-  if (value == null) {
-    throw TypeError(
-      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
-      'or Array-like Object. Received type ' + (typeof value)
-    )
-  }
-
-  if (isInstance(value, ArrayBuffer) ||
-      (value && isInstance(value.buffer, ArrayBuffer))) {
-    return fromArrayBuffer(value, encodingOrOffset, length)
-  }
-
-  if (typeof value === 'number') {
-    throw new TypeError(
-      'The "value" argument must not be of type number. Received type number'
-    )
-  }
-
-  var valueOf = value.valueOf && value.valueOf()
-  if (valueOf != null && valueOf !== value) {
-    return Buffer.from(valueOf, encodingOrOffset, length)
-  }
-
-  var b = fromObject(value)
-  if (b) return b
-
-  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
-      typeof value[Symbol.toPrimitive] === 'function') {
-    return Buffer.from(
-      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
-    )
-  }
-
-  throw new TypeError(
-    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
-    'or Array-like Object. Received type ' + (typeof value)
-  )
-}
-
-/**
- * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
- * if value is a number.
- * Buffer.from(str[, encoding])
- * Buffer.from(array)
- * Buffer.from(buffer)
- * Buffer.from(arrayBuffer[, byteOffset[, length]])
- **/
-Buffer.from = function (value, encodingOrOffset, length) {
-  return from(value, encodingOrOffset, length)
-}
-
-// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
-// https://github.com/feross/buffer/pull/148
-Buffer.prototype.__proto__ = Uint8Array.prototype
-Buffer.__proto__ = Uint8Array
-
-function assertSize (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('"size" argument must be of type number')
-  } else if (size < 0) {
-    throw new RangeError('The value "' + size + '" is invalid for option "size"')
-  }
-}
-
-function alloc (size, fill, encoding) {
-  assertSize(size)
-  if (size <= 0) {
-    return createBuffer(size)
-  }
-  if (fill !== undefined) {
-    // Only pay attention to encoding if it's a string. This
-    // prevents accidentally sending in a number that would
-    // be interpretted as a start offset.
-    return typeof encoding === 'string'
-      ? createBuffer(size).fill(fill, encoding)
-      : createBuffer(size).fill(fill)
-  }
-  return createBuffer(size)
-}
-
-/**
- * Creates a new filled Buffer instance.
- * alloc(size[, fill[, encoding]])
- **/
-Buffer.alloc = function (size, fill, encoding) {
-  return alloc(size, fill, encoding)
-}
-
-function allocUnsafe (size) {
-  assertSize(size)
-  return createBuffer(size < 0 ? 0 : checked(size) | 0)
-}
-
-/**
- * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
- * */
-Buffer.allocUnsafe = function (size) {
-  return allocUnsafe(size)
-}
-/**
- * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
- */
-Buffer.allocUnsafeSlow = function (size) {
-  return allocUnsafe(size)
-}
-
-function fromString (string, encoding) {
-  if (typeof encoding !== 'string' || encoding === '') {
-    encoding = 'utf8'
-  }
-
-  if (!Buffer.isEncoding(encoding)) {
-    throw new TypeError('Unknown encoding: ' + encoding)
-  }
-
-  var length = byteLength(string, encoding) | 0
-  var buf = createBuffer(length)
-
-  var actual = buf.write(string, encoding)
-
-  if (actual !== length) {
-    // Writing a hex string, for example, that contains invalid characters will
-    // cause everything after the first invalid character to be ignored. (e.g.
-    // 'abxxcd' will be treated as 'ab')
-    buf = buf.slice(0, actual)
-  }
-
-  return buf
-}
-
-function fromArrayLike (array) {
-  var length = array.length < 0 ? 0 : checked(array.length) | 0
-  var buf = createBuffer(length)
-  for (var i = 0; i < length; i += 1) {
-    buf[i] = array[i] & 255
-  }
-  return buf
-}
-
-function fromArrayBuffer (array, byteOffset, length) {
-  if (byteOffset < 0 || array.byteLength < byteOffset) {
-    throw new RangeError('"offset" is outside of buffer bounds')
-  }
-
-  if (array.byteLength < byteOffset + (length || 0)) {
-    throw new RangeError('"length" is outside of buffer bounds')
-  }
-
-  var buf
-  if (byteOffset === undefined && length === undefined) {
-    buf = new Uint8Array(array)
-  } else if (length === undefined) {
-    buf = new Uint8Array(array, byteOffset)
-  } else {
-    buf = new Uint8Array(array, byteOffset, length)
-  }
-
-  // Return an augmented `Uint8Array` instance
-  buf.__proto__ = Buffer.prototype
-  return buf
-}
-
-function fromObject (obj) {
-  if (Buffer.isBuffer(obj)) {
-    var len = checked(obj.length) | 0
-    var buf = createBuffer(len)
-
-    if (buf.length === 0) {
-      return buf
-    }
-
-    obj.copy(buf, 0, 0, len)
-    return buf
-  }
-
-  if (obj.length !== undefined) {
-    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
-      return createBuffer(0)
-    }
-    return fromArrayLike(obj)
-  }
-
-  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
-    return fromArrayLike(obj.data)
-  }
-}
-
-function checked (length) {
-  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
-  // length is NaN (which is otherwise coerced to zero.)
-  if (length >= K_MAX_LENGTH) {
-    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
-                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
-  }
-  return length | 0
-}
-
-function SlowBuffer (length) {
-  if (+length != length) { // eslint-disable-line eqeqeq
-    length = 0
-  }
-  return Buffer.alloc(+length)
-}
-
-Buffer.isBuffer = function isBuffer (b) {
-  return b != null && b._isBuffer === true &&
-    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
-}
-
-Buffer.compare = function compare (a, b) {
-  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
-  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
-  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
-    throw new TypeError(
-      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
-    )
-  }
-
-  if (a === b) return 0
-
-  var x = a.length
-  var y = b.length
-
-  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
-    if (a[i] !== b[i]) {
-      x = a[i]
-      y = b[i]
-      break
-    }
-  }
-
-  if (x < y) return -1
-  if (y < x) return 1
-  return 0
-}
-
-Buffer.isEncoding = function isEncoding (encoding) {
-  switch (String(encoding).toLowerCase()) {
-    case 'hex':
-    case 'utf8':
-    case 'utf-8':
-    case 'ascii':
-    case 'latin1':
-    case 'binary':
-    case 'base64':
-    case 'ucs2':
-    case 'ucs-2':
-    case 'utf16le':
-    case 'utf-16le':
-      return true
-    default:
-      return false
-  }
-}
-
-Buffer.concat = function concat (list, length) {
-  if (!Array.isArray(list)) {
-    throw new TypeError('"list" argument must be an Array of Buffers')
-  }
-
-  if (list.length === 0) {
-    return Buffer.alloc(0)
-  }
-
-  var i
-  if (length === undefined) {
-    length = 0
-    for (i = 0; i < list.length; ++i) {
-      length += list[i].length
-    }
-  }
-
-  var buffer = Buffer.allocUnsafe(length)
-  var pos = 0
-  for (i = 0; i < list.length; ++i) {
-    var buf = list[i]
-    if (isInstance(buf, Uint8Array)) {
-      buf = Buffer.from(buf)
-    }
-    if (!Buffer.isBuffer(buf)) {
-      throw new TypeError('"list" argument must be an Array of Buffers')
-    }
-    buf.copy(buffer, pos)
-    pos += buf.length
-  }
-  return buffer
-}
-
-function byteLength (string, encoding) {
-  if (Buffer.isBuffer(string)) {
-    return string.length
-  }
-  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
-    return string.byteLength
-  }
-  if (typeof string !== 'string') {
-    throw new TypeError(
-      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
-      'Received type ' + typeof string
-    )
-  }
-
-  var len = string.length
-  var mustMatch = (arguments.length > 2 && arguments[2] === true)
-  if (!mustMatch && len === 0) return 0
-
-  // Use a for loop to avoid recursion
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'ascii':
-      case 'latin1':
-      case 'binary':
-        return len
-      case 'utf8':
-      case 'utf-8':
-        return utf8ToBytes(string).length
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return len * 2
-      case 'hex':
-        return len >>> 1
-      case 'base64':
-        return base64ToBytes(string).length
-      default:
-        if (loweredCase) {
-          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
-        }
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-Buffer.byteLength = byteLength
-
-function slowToString (encoding, start, end) {
-  var loweredCase = false
-
-  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
-  // property of a typed array.
-
-  // This behaves neither like String nor Uint8Array in that we set start/end
-  // to their upper/lower bounds if the value passed is out of range.
-  // undefined is handled specially as per ECMA-262 6th Edition,
-  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
-  if (start === undefined || start < 0) {
-    start = 0
-  }
-  // Return early if start > this.length. Done here to prevent potential uint32
-  // coercion fail below.
-  if (start > this.length) {
-    return ''
-  }
-
-  if (end === undefined || end > this.length) {
-    end = this.length
-  }
-
-  if (end <= 0) {
-    return ''
-  }
-
-  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
-  end >>>= 0
-  start >>>= 0
-
-  if (end <= start) {
-    return ''
-  }
-
-  if (!encoding) encoding = 'utf8'
-
-  while (true) {
-    switch (encoding) {
-      case 'hex':
-        return hexSlice(this, start, end)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Slice(this, start, end)
-
-      case 'ascii':
-        return asciiSlice(this, start, end)
-
-      case 'latin1':
-      case 'binary':
-        return latin1Slice(this, start, end)
-
-      case 'base64':
-        return base64Slice(this, start, end)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return utf16leSlice(this, start, end)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = (encoding + '').toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
-// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
-// reliably in a browserify context because there could be multiple different
-// copies of the 'buffer' package in use. This method works even for Buffer
-// instances that were created from another copy of the `buffer` package.
-// See: https://github.com/feross/buffer/issues/154
-Buffer.prototype._isBuffer = true
-
-function swap (b, n, m) {
-  var i = b[n]
-  b[n] = b[m]
-  b[m] = i
-}
-
-Buffer.prototype.swap16 = function swap16 () {
-  var len = this.length
-  if (len % 2 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 16-bits')
-  }
-  for (var i = 0; i < len; i += 2) {
-    swap(this, i, i + 1)
-  }
-  return this
-}
-
-Buffer.prototype.swap32 = function swap32 () {
-  var len = this.length
-  if (len % 4 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 32-bits')
-  }
-  for (var i = 0; i < len; i += 4) {
-    swap(this, i, i + 3)
-    swap(this, i + 1, i + 2)
-  }
-  return this
-}
-
-Buffer.prototype.swap64 = function swap64 () {
-  var len = this.length
-  if (len % 8 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 64-bits')
-  }
-  for (var i = 0; i < len; i += 8) {
-    swap(this, i, i + 7)
-    swap(this, i + 1, i + 6)
-    swap(this, i + 2, i + 5)
-    swap(this, i + 3, i + 4)
-  }
-  return this
-}
-
-Buffer.prototype.toString = function toString () {
-  var length = this.length
-  if (length === 0) return ''
-  if (arguments.length === 0) return utf8Slice(this, 0, length)
-  return slowToString.apply(this, arguments)
-}
-
-Buffer.prototype.toLocaleString = Buffer.prototype.toString
-
-Buffer.prototype.equals = function equals (b) {
-  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-  if (this === b) return true
-  return Buffer.compare(this, b) === 0
-}
-
-Buffer.prototype.inspect = function inspect () {
-  var str = ''
-  var max = exports.INSPECT_MAX_BYTES
-  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
-  if (this.length > max) str += ' ... '
-  return '<Buffer ' + str + '>'
-}
-
-Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
-  if (isInstance(target, Uint8Array)) {
-    target = Buffer.from(target, target.offset, target.byteLength)
-  }
-  if (!Buffer.isBuffer(target)) {
-    throw new TypeError(
-      'The "target" argument must be one of type Buffer or Uint8Array. ' +
-      'Received type ' + (typeof target)
-    )
-  }
-
-  if (start === undefined) {
-    start = 0
-  }
-  if (end === undefined) {
-    end = target ? target.length : 0
-  }
-  if (thisStart === undefined) {
-    thisStart = 0
-  }
-  if (thisEnd === undefined) {
-    thisEnd = this.length
-  }
-
-  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
-    throw new RangeError('out of range index')
-  }
-
-  if (thisStart >= thisEnd && start >= end) {
-    return 0
-  }
-  if (thisStart >= thisEnd) {
-    return -1
-  }
-  if (start >= end) {
-    return 1
-  }
-
-  start >>>= 0
-  end >>>= 0
-  thisStart >>>= 0
-  thisEnd >>>= 0
-
-  if (this === target) return 0
-
-  var x = thisEnd - thisStart
-  var y = end - start
-  var len = Math.min(x, y)
-
-  var thisCopy = this.slice(thisStart, thisEnd)
-  var targetCopy = target.slice(start, end)
-
-  for (var i = 0; i < len; ++i) {
-    if (thisCopy[i] !== targetCopy[i]) {
-      x = thisCopy[i]
-      y = targetCopy[i]
-      break
-    }
-  }
-
-  if (x < y) return -1
-  if (y < x) return 1
-  return 0
-}
-
-// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
-// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
-//
-// Arguments:
-// - buffer - a Buffer to search
-// - val - a string, Buffer, or number
-// - byteOffset - an index into `buffer`; will be clamped to an int32
-// - encoding - an optional encoding, relevant is val is a string
-// - dir - true for indexOf, false for lastIndexOf
-function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
-  // Empty buffer means no match
-  if (buffer.length === 0) return -1
-
-  // Normalize byteOffset
-  if (typeof byteOffset === 'string') {
-    encoding = byteOffset
-    byteOffset = 0
-  } else if (byteOffset > 0x7fffffff) {
-    byteOffset = 0x7fffffff
-  } else if (byteOffset < -0x80000000) {
-    byteOffset = -0x80000000
-  }
-  byteOffset = +byteOffset // Coerce to Number.
-  if (numberIsNaN(byteOffset)) {
-    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
-    byteOffset = dir ? 0 : (buffer.length - 1)
-  }
-
-  // Normalize byteOffset: negative offsets start from the end of the buffer
-  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
-  if (byteOffset >= buffer.length) {
-    if (dir) return -1
-    else byteOffset = buffer.length - 1
-  } else if (byteOffset < 0) {
-    if (dir) byteOffset = 0
-    else return -1
-  }
-
-  // Normalize val
-  if (typeof val === 'string') {
-    val = Buffer.from(val, encoding)
-  }
-
-  // Finally, search either indexOf (if dir is true) or lastIndexOf
-  if (Buffer.isBuffer(val)) {
-    // Special case: looking for empty string/buffer always fails
-    if (val.length === 0) {
-      return -1
-    }
-    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
-  } else if (typeof val === 'number') {
-    val = val & 0xFF // Search for a byte value [0-255]
-    if (typeof Uint8Array.prototype.indexOf === 'function') {
-      if (dir) {
-        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
-      } else {
-        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
-      }
-    }
-    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
-  }
-
-  throw new TypeError('val must be string, number or Buffer')
-}
-
-function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
-  var indexSize = 1
-  var arrLength = arr.length
-  var valLength = val.length
-
-  if (encoding !== undefined) {
-    encoding = String(encoding).toLowerCase()
-    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
-        encoding === 'utf16le' || encoding === 'utf-16le') {
-      if (arr.length < 2 || val.length < 2) {
-        return -1
-      }
-      indexSize = 2
-      arrLength /= 2
-      valLength /= 2
-      byteOffset /= 2
-    }
-  }
-
-  function read (buf, i) {
-    if (indexSize === 1) {
-      return buf[i]
-    } else {
-      return buf.readUInt16BE(i * indexSize)
-    }
-  }
-
-  var i
-  if (dir) {
-    var foundIndex = -1
-    for (i = byteOffset; i < arrLength; i++) {
-      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
-        if (foundIndex === -1) foundIndex = i
-        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
-      } else {
-        if (foundIndex !== -1) i -= i - foundIndex
-        foundIndex = -1
-      }
-    }
-  } else {
-    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
-    for (i = byteOffset; i >= 0; i--) {
-      var found = true
-      for (var j = 0; j < valLength; j++) {
-        if (read(arr, i + j) !== read(val, j)) {
-          found = false
-          break
-        }
-      }
-      if (found) return i
-    }
-  }
-
-  return -1
-}
-
-Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
-  return this.indexOf(val, byteOffset, encoding) !== -1
-}
-
-Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
-  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
-}
-
-Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
-  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
-}
-
-function hexWrite (buf, string, offset, length) {
-  offset = Number(offset) || 0
-  var remaining = buf.length - offset
-  if (!length) {
-    length = remaining
-  } else {
-    length = Number(length)
-    if (length > remaining) {
-      length = remaining
-    }
-  }
-
-  var strLen = string.length
-
-  if (length > strLen / 2) {
-    length = strLen / 2
-  }
-  for (var i = 0; i < length; ++i) {
-    var parsed = parseInt(string.substr(i * 2, 2), 16)
-    if (numberIsNaN(parsed)) return i
-    buf[offset + i] = parsed
-  }
-  return i
-}
-
-function utf8Write (buf, string, offset, length) {
-  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-function asciiWrite (buf, string, offset, length) {
-  return blitBuffer(asciiToBytes(string), buf, offset, length)
-}
-
-function latin1Write (buf, string, offset, length) {
-  return asciiWrite(buf, string, offset, length)
-}
-
-function base64Write (buf, string, offset, length) {
-  return blitBuffer(base64ToBytes(string), buf, offset, length)
-}
-
-function ucs2Write (buf, string, offset, length) {
-  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-Buffer.prototype.write = function write (string, offset, length, encoding) {
-  // Buffer#write(string)
-  if (offset === undefined) {
-    encoding = 'utf8'
-    length = this.length
-    offset = 0
-  // Buffer#write(string, encoding)
-  } else if (length === undefined && typeof offset === 'string') {
-    encoding = offset
-    length = this.length
-    offset = 0
-  // Buffer#write(string, offset[, length][, encoding])
-  } else if (isFinite(offset)) {
-    offset = offset >>> 0
-    if (isFinite(length)) {
-      length = length >>> 0
-      if (encoding === undefined) encoding = 'utf8'
-    } else {
-      encoding = length
-      length = undefined
-    }
-  } else {
-    throw new Error(
-      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
-    )
-  }
-
-  var remaining = this.length - offset
-  if (length === undefined || length > remaining) length = remaining
-
-  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-    throw new RangeError('Attempt to write outside buffer bounds')
-  }
-
-  if (!encoding) encoding = 'utf8'
-
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'hex':
-        return hexWrite(this, string, offset, length)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Write(this, string, offset, length)
-
-      case 'ascii':
-        return asciiWrite(this, string, offset, length)
-
-      case 'latin1':
-      case 'binary':
-        return latin1Write(this, string, offset, length)
-
-      case 'base64':
-        // Warning: maxLength not taken into account in base64Write
-        return base64Write(this, string, offset, length)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return ucs2Write(this, string, offset, length)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-Buffer.prototype.toJSON = function toJSON () {
-  return {
-    type: 'Buffer',
-    data: Array.prototype.slice.call(this._arr || this, 0)
-  }
-}
-
-function base64Slice (buf, start, end) {
-  if (start === 0 && end === buf.length) {
-    return base64.fromByteArray(buf)
-  } else {
-    return base64.fromByteArray(buf.slice(start, end))
-  }
-}
-
-function utf8Slice (buf, start, end) {
-  end = Math.min(buf.length, end)
-  var res = []
-
-  var i = start
-  while (i < end) {
-    var firstByte = buf[i]
-    var codePoint = null
-    var bytesPerSequence = (firstByte > 0xEF) ? 4
-      : (firstByte > 0xDF) ? 3
-        : (firstByte > 0xBF) ? 2
-          : 1
-
-    if (i + bytesPerSequence <= end) {
-      var secondByte, thirdByte, fourthByte, tempCodePoint
-
-      switch (bytesPerSequence) {
-        case 1:
-          if (firstByte < 0x80) {
-            codePoint = firstByte
-          }
-          break
-        case 2:
-          secondByte = buf[i + 1]
-          if ((secondByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
-            if (tempCodePoint > 0x7F) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 3:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
-            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 4:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          fourthByte = buf[i + 3]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
-            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
-              codePoint = tempCodePoint
-            }
-          }
-      }
-    }
-
-    if (codePoint === null) {
-      // we did not generate a valid codePoint so insert a
-      // replacement char (U+FFFD) and advance only 1 byte
-      codePoint = 0xFFFD
-      bytesPerSequence = 1
-    } else if (codePoint > 0xFFFF) {
-      // encode to utf16 (surrogate pair dance)
-      codePoint -= 0x10000
-      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
-      codePoint = 0xDC00 | codePoint & 0x3FF
-    }
-
-    res.push(codePoint)
-    i += bytesPerSequence
-  }
-
-  return decodeCodePointsArray(res)
-}
-
-// Based on http://stackoverflow.com/a/22747272/680742, the browser with
-// the lowest limit is Chrome, with 0x10000 args.
-// We go 1 magnitude less, for safety
-var MAX_ARGUMENTS_LENGTH = 0x1000
-
-function decodeCodePointsArray (codePoints) {
-  var len = codePoints.length
-  if (len <= MAX_ARGUMENTS_LENGTH) {
-    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
-  }
-
-  // Decode in chunks to avoid "call stack size exceeded".
-  var res = ''
-  var i = 0
-  while (i < len) {
-    res += String.fromCharCode.apply(
-      String,
-      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
-    )
-  }
-  return res
-}
-
-function asciiSlice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; ++i) {
-    ret += String.fromCharCode(buf[i] & 0x7F)
-  }
-  return ret
-}
-
-function latin1Slice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; ++i) {
-    ret += String.fromCharCode(buf[i])
-  }
-  return ret
-}
-
-function hexSlice (buf, start, end) {
-  var len = buf.length
-
-  if (!start || start < 0) start = 0
-  if (!end || end < 0 || end > len) end = len
-
-  var out = ''
-  for (var i = start; i < end; ++i) {
-    out += toHex(buf[i])
-  }
-  return out
-}
-
-function utf16leSlice (buf, start, end) {
-  var bytes = buf.slice(start, end)
-  var res = ''
-  for (var i = 0; i < bytes.length; i += 2) {
-    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
-  }
-  return res
-}
-
-Buffer.prototype.slice = function slice (start, end) {
-  var len = this.length
-  start = ~~start
-  end = end === undefined ? len : ~~end
-
-  if (start < 0) {
-    start += len
-    if (start < 0) start = 0
-  } else if (start > len) {
-    start = len
-  }
-
-  if (end < 0) {
-    end += len
-    if (end < 0) end = 0
-  } else if (end > len) {
-    end = len
-  }
-
-  if (end < start) end = start
-
-  var newBuf = this.subarray(start, end)
-  // Return an augmented `Uint8Array` instance
-  newBuf.__proto__ = Buffer.prototype
-  return newBuf
-}
-
-/*
- * Need to make sure that buffer isn't trying to write out of bounds.
- */
-function checkOffset (offset, ext, length) {
-  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
-  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
-}
-
-Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var val = this[offset]
-  var mul = 1
-  var i = 0
-  while (++i < byteLength && (mul *= 0x100)) {
-    val += this[offset + i] * mul
-  }
-
-  return val
-}
-
-Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    checkOffset(offset, byteLength, this.length)
-  }
-
-  var val = this[offset + --byteLength]
-  var mul = 1
-  while (byteLength > 0 && (mul *= 0x100)) {
-    val += this[offset + --byteLength] * mul
-  }
-
-  return val
-}
-
-Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 1, this.length)
-  return this[offset]
-}
-
-Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  return this[offset] | (this[offset + 1] << 8)
-}
-
-Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  return (this[offset] << 8) | this[offset + 1]
-}
-
-Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return ((this[offset]) |
-      (this[offset + 1] << 8) |
-      (this[offset + 2] << 16)) +
-      (this[offset + 3] * 0x1000000)
-}
-
-Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset] * 0x1000000) +
-    ((this[offset + 1] << 16) |
-    (this[offset + 2] << 8) |
-    this[offset + 3])
-}
-
-Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var val = this[offset]
-  var mul = 1
-  var i = 0
-  while (++i < byteLength && (mul *= 0x100)) {
-    val += this[offset + i] * mul
-  }
-  mul *= 0x80
-
-  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-  return val
-}
-
-Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var i = byteLength
-  var mul = 1
-  var val = this[offset + --i]
-  while (i > 0 && (mul *= 0x100)) {
-    val += this[offset + --i] * mul
-  }
-  mul *= 0x80
-
-  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-  return val
-}
-
-Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 1, this.length)
-  if (!(this[offset] & 0x80)) return (this[offset])
-  return ((0xff - this[offset] + 1) * -1)
-}
-
-Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  var val = this[offset] | (this[offset + 1] << 8)
-  return (val & 0x8000) ? val | 0xFFFF0000 : val
-}
-
-Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  var val = this[offset + 1] | (this[offset] << 8)
-  return (val & 0x8000) ? val | 0xFFFF0000 : val
-}
-
-Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset]) |
-    (this[offset + 1] << 8) |
-    (this[offset + 2] << 16) |
-    (this[offset + 3] << 24)
-}
-
-Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset] << 24) |
-    (this[offset + 1] << 16) |
-    (this[offset + 2] << 8) |
-    (this[offset + 3])
-}
-
-Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-  return ieee754.read(this, offset, true, 23, 4)
-}
-
-Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-  return ieee754.read(this, offset, false, 23, 4)
-}
-
-Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 8, this.length)
-  return ieee754.read(this, offset, true, 52, 8)
-}
-
-Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 8, this.length)
-  return ieee754.read(this, offset, false, 52, 8)
-}
-
-function checkInt (buf, value, offset, ext, max, min) {
-  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
-  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
-  if (offset + ext > buf.length) throw new RangeError('Index out of range')
-}
-
-Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    var maxBytes = Math.pow(2, 8 * byteLength) - 1
-    checkInt(this, value, offset, byteLength, maxBytes, 0)
-  }
-
-  var mul = 1
-  var i = 0
-  this[offset] = value & 0xFF
-  while (++i < byteLength && (mul *= 0x100)) {
-    this[offset + i] = (value / mul) & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    var maxBytes = Math.pow(2, 8 * byteLength) - 1
-    checkInt(this, value, offset, byteLength, maxBytes, 0)
-  }
-
-  var i = byteLength - 1
-  var mul = 1
-  this[offset + i] = value & 0xFF
-  while (--i >= 0 && (mul *= 0x100)) {
-    this[offset + i] = (value / mul) & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
-  this[offset] = (value & 0xff)
-  return offset + 1
-}
-
-Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  return offset + 2
-}
-
-Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  this[offset] = (value >>> 8)
-  this[offset + 1] = (value & 0xff)
-  return offset + 2
-}
-
-Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  this[offset + 3] = (value >>> 24)
-  this[offset + 2] = (value >>> 16)
-  this[offset + 1] = (value >>> 8)
-  this[offset] = (value & 0xff)
-  return offset + 4
-}
-
-Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  this[offset] = (value >>> 24)
-  this[offset + 1] = (value >>> 16)
-  this[offset + 2] = (value >>> 8)
-  this[offset + 3] = (value & 0xff)
-  return offset + 4
-}
-
-Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    var limit = Math.pow(2, (8 * byteLength) - 1)
-
-    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-  }
-
-  var i = 0
-  var mul = 1
-  var sub = 0
-  this[offset] = value & 0xFF
-  while (++i < byteLength && (mul *= 0x100)) {
-    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
-      sub = 1
-    }
-    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    var limit = Math.pow(2, (8 * byteLength) - 1)
-
-    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-  }
-
-  var i = byteLength - 1
-  var mul = 1
-  var sub = 0
-  this[offset + i] = value & 0xFF
-  while (--i >= 0 && (mul *= 0x100)) {
-    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
-      sub = 1
-    }
-    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
-  if (value < 0) value = 0xff + value + 1
-  this[offset] = (value & 0xff)
-  return offset + 1
-}
-
-Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  return offset + 2
-}
-
-Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  this[offset] = (value >>> 8)
-  this[offset + 1] = (value & 0xff)
-  return offset + 2
-}
-
-Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  this[offset + 2] = (value >>> 16)
-  this[offset + 3] = (value >>> 24)
-  return offset + 4
-}
-
-Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-  if (value < 0) value = 0xffffffff + value + 1
-  this[offset] = (value >>> 24)
-  this[offset + 1] = (value >>> 16)
-  this[offset + 2] = (value >>> 8)
-  this[offset + 3] = (value & 0xff)
-  return offset + 4
-}
-
-function checkIEEE754 (buf, value, offset, ext, max, min) {
-  if (offset + ext > buf.length) throw new RangeError('Index out of range')
-  if (offset < 0) throw new RangeError('Index out of range')
-}
-
-function writeFloat (buf, value, offset, littleEndian, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
-  }
-  ieee754.write(buf, value, offset, littleEndian, 23, 4)
-  return offset + 4
-}
-
-Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
-  return writeFloat(this, value, offset, true, noAssert)
-}
-
-Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
-  return writeFloat(this, value, offset, false, noAssert)
-}
-
-function writeDouble (buf, value, offset, littleEndian, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
-  }
-  ieee754.write(buf, value, offset, littleEndian, 52, 8)
-  return offset + 8
-}
-
-Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
-  return writeDouble(this, value, offset, true, noAssert)
-}
-
-Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
-  return writeDouble(this, value, offset, false, noAssert)
-}
-
-// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
-Buffer.prototype.copy = function copy (target, targetStart, start, end) {
-  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
-  if (!start) start = 0
-  if (!end && end !== 0) end = this.length
-  if (targetStart >= target.length) targetStart = target.length
-  if (!targetStart) targetStart = 0
-  if (end > 0 && end < start) end = start
-
-  // Copy 0 bytes; we're done
-  if (end === start) return 0
-  if (target.length === 0 || this.length === 0) return 0
-
-  // Fatal error conditions
-  if (targetStart < 0) {
-    throw new RangeError('targetStart out of bounds')
-  }
-  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
-  if (end < 0) throw new RangeError('sourceEnd out of bounds')
-
-  // Are we oob?
-  if (end > this.length) end = this.length
-  if (target.length - targetStart < end - start) {
-    end = target.length - targetStart + start
-  }
-
-  var len = end - start
-
-  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
-    // Use built-in when available, missing from IE11
-    this.copyWithin(targetStart, start, end)
-  } else if (this === target && start < targetStart && targetStart < end) {
-    // descending copy from end
-    for (var i = len - 1; i >= 0; --i) {
-      target[i + targetStart] = this[i + start]
-    }
-  } else {
-    Uint8Array.prototype.set.call(
-      target,
-      this.subarray(start, end),
-      targetStart
-    )
-  }
-
-  return len
-}
-
-// Usage:
-//    buffer.fill(number[, offset[, end]])
-//    buffer.fill(buffer[, offset[, end]])
-//    buffer.fill(string[, offset[, end]][, encoding])
-Buffer.prototype.fill = function fill (val, start, end, encoding) {
-  // Handle string cases:
-  if (typeof val === 'string') {
-    if (typeof start === 'string') {
-      encoding = start
-      start = 0
-      end = this.length
-    } else if (typeof end === 'string') {
-      encoding = end
-      end = this.length
-    }
-    if (encoding !== undefined && typeof encoding !== 'string') {
-      throw new TypeError('encoding must be a string')
-    }
-    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
-      throw new TypeError('Unknown encoding: ' + encoding)
-    }
-    if (val.length === 1) {
-      var code = val.charCodeAt(0)
-      if ((encoding === 'utf8' && code < 128) ||
-          encoding === 'latin1') {
-        // Fast path: If `val` fits into a single byte, use that numeric value.
-        val = code
-      }
-    }
-  } else if (typeof val === 'number') {
-    val = val & 255
-  }
-
-  // Invalid ranges are not set to a default, so can range check early.
-  if (start < 0 || this.length < start || this.length < end) {
-    throw new RangeError('Out of range index')
-  }
-
-  if (end <= start) {
-    return this
-  }
-
-  start = start >>> 0
-  end = end === undefined ? this.length : end >>> 0
-
-  if (!val) val = 0
-
-  var i
-  if (typeof val === 'number') {
-    for (i = start; i < end; ++i) {
-      this[i] = val
-    }
-  } else {
-    var bytes = Buffer.isBuffer(val)
-      ? val
-      : Buffer.from(val, encoding)
-    var len = bytes.length
-    if (len === 0) {
-      throw new TypeError('The value "' + val +
-        '" is invalid for argument "value"')
-    }
-    for (i = 0; i < end - start; ++i) {
-      this[i + start] = bytes[i % len]
-    }
-  }
-
-  return this
-}
-
-// HELPER FUNCTIONS
-// ================
-
-var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
-
-function base64clean (str) {
-  // Node takes equal signs as end of the Base64 encoding
-  str = str.split('=')[0]
-  // Node strips out invalid characters like \n and \t from the string, base64-js does not
-  str = str.trim().replace(INVALID_BASE64_RE, '')
-  // Node converts strings with length < 2 to ''
-  if (str.length < 2) return ''
-  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
-  while (str.length % 4 !== 0) {
-    str = str + '='
-  }
-  return str
-}
-
-function toHex (n) {
-  if (n < 16) return '0' + n.toString(16)
-  return n.toString(16)
-}
-
-function utf8ToBytes (string, units) {
-  units = units || Infinity
-  var codePoint
-  var length = string.length
-  var leadSurrogate = null
-  var bytes = []
-
-  for (var i = 0; i < length; ++i) {
-    codePoint = string.charCodeAt(i)
-
-    // is surrogate component
-    if (codePoint > 0xD7FF && codePoint < 0xE000) {
-      // last char was a lead
-      if (!leadSurrogate) {
-        // no lead yet
-        if (codePoint > 0xDBFF) {
-          // unexpected trail
-          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-          continue
-        } else if (i + 1 === length) {
-          // unpaired lead
-          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-          continue
-        }
-
-        // valid lead
-        leadSurrogate = codePoint
-
-        continue
-      }
-
-      // 2 leads in a row
-      if (codePoint < 0xDC00) {
-        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-        leadSurrogate = codePoint
-        continue
-      }
-
-      // valid surrogate pair
-      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
-    } else if (leadSurrogate) {
-      // valid bmp char, but last char was a lead
-      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-    }
-
-    leadSurrogate = null
-
-    // encode utf8
-    if (codePoint < 0x80) {
-      if ((units -= 1) < 0) break
-      bytes.push(codePoint)
-    } else if (codePoint < 0x800) {
-      if ((units -= 2) < 0) break
-      bytes.push(
-        codePoint >> 0x6 | 0xC0,
-        codePoint & 0x3F | 0x80
-      )
-    } else if (codePoint < 0x10000) {
-      if ((units -= 3) < 0) break
-      bytes.push(
-        codePoint >> 0xC | 0xE0,
-        codePoint >> 0x6 & 0x3F | 0x80,
-        codePoint & 0x3F | 0x80
-      )
-    } else if (codePoint < 0x110000) {
-      if ((units -= 4) < 0) break
-      bytes.push(
-        codePoint >> 0x12 | 0xF0,
-        codePoint >> 0xC & 0x3F | 0x80,
-        codePoint >> 0x6 & 0x3F | 0x80,
-        codePoint & 0x3F | 0x80
-      )
-    } else {
-      throw new Error('Invalid code point')
-    }
-  }
-
-  return bytes
-}
-
-function asciiToBytes (str) {
-  var byteArray = []
-  for (var i = 0; i < str.length; ++i) {
-    // Node's code seems to be doing this and not & 0x7F..
-    byteArray.push(str.charCodeAt(i) & 0xFF)
-  }
-  return byteArray
-}
-
-function utf16leToBytes (str, units) {
-  var c, hi, lo
-  var byteArray = []
-  for (var i = 0; i < str.length; ++i) {
-    if ((units -= 2) < 0) break
-
-    c = str.charCodeAt(i)
-    hi = c >> 8
-    lo = c % 256
-    byteArray.push(lo)
-    byteArray.push(hi)
-  }
-
-  return byteArray
-}
-
-function base64ToBytes (str) {
-  return base64.toByteArray(base64clean(str))
-}
-
-function blitBuffer (src, dst, offset, length) {
-  for (var i = 0; i < length; ++i) {
-    if ((i + offset >= dst.length) || (i >= src.length)) break
-    dst[i + offset] = src[i]
-  }
-  return i
-}
-
-// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
-// the `instanceof` check but they should be treated as of that type.
-// See: https://github.com/feross/buffer/issues/166
-function isInstance (obj, type) {
-  return obj instanceof type ||
-    (obj != null && obj.constructor != null && obj.constructor.name != null &&
-      obj.constructor.name === type.name)
-}
-function numberIsNaN (obj) {
-  // For IE11 support
-  return obj !== obj // eslint-disable-line no-self-compare
-}
-
-}).call(this,require("buffer").Buffer)
-},{"base64-js":1,"buffer":3,"ieee754":6}],4:[function(require,module,exports){
-(function (Buffer){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-
-function isArray(arg) {
-  if (Array.isArray) {
-    return Array.isArray(arg);
-  }
-  return objectToString(arg) === '[object Array]';
-}
-exports.isArray = isArray;
-
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
-
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
-
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
-
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-exports.isNumber = isNumber;
-
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
-
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
-
-function isUndefined(arg) {
-  return arg === void 0;
-}
-exports.isUndefined = isUndefined;
-
-function isRegExp(re) {
-  return objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
-
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
-
-function isDate(d) {
-  return objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
-
-function isError(e) {
-  return (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
-
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
-
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
-}
-exports.isPrimitive = isPrimitive;
-
-exports.isBuffer = Buffer.isBuffer;
-
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
-
-}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
-},{"../../is-buffer/index.js":8}],5:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var objectCreate = Object.create || objectCreatePolyfill
-var objectKeys = Object.keys || objectKeysPolyfill
-var bind = Function.prototype.bind || functionBindPolyfill
-
-function EventEmitter() {
-  if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
-    this._events = objectCreate(null);
-    this._eventsCount = 0;
-  }
-
-  this._maxListeners = this._maxListeners || undefined;
-}
-module.exports = EventEmitter;
-
-// Backwards-compat with node 0.10.x
-EventEmitter.EventEmitter = EventEmitter;
-
-EventEmitter.prototype._events = undefined;
-EventEmitter.prototype._maxListeners = undefined;
-
-// By default EventEmitters will print a warning if more than 10 listeners are
-// added to it. This is a useful default which helps finding memory leaks.
-var defaultMaxListeners = 10;
-
-var hasDefineProperty;
-try {
-  var o = {};
-  if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
-  hasDefineProperty = o.x === 0;
-} catch (err) { hasDefineProperty = false }
-if (hasDefineProperty) {
-  Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
-    enumerable: true,
-    get: function() {
-      return defaultMaxListeners;
-    },
-    set: function(arg) {
-      // check whether the input is a positive number (whose value is zero or
-      // greater and not a NaN).
-      if (typeof arg !== 'number' || arg < 0 || arg !== arg)
-        throw new TypeError('"defaultMaxListeners" must be a positive number');
-      defaultMaxListeners = arg;
-    }
-  });
-} else {
-  EventEmitter.defaultMaxListeners = defaultMaxListeners;
-}
-
-// Obviously not all Emitters should be limited to 10. This function allows
-// that to be increased. Set to zero for unlimited.
-EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
-  if (typeof n !== 'number' || n < 0 || isNaN(n))
-    throw new TypeError('"n" argument must be a positive number');
-  this._maxListeners = n;
-  return this;
-};
-
-function $getMaxListeners(that) {
-  if (that._maxListeners === undefined)
-    return EventEmitter.defaultMaxListeners;
-  return that._maxListeners;
-}
-
-EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
-  return $getMaxListeners(this);
-};
-
-// These standalone emit* functions are used to optimize calling of event
-// handlers for fast cases because emit() itself often has a variable number of
-// arguments and can be deoptimized because of that. These functions always have
-// the same number of arguments and thus do not get deoptimized, so the code
-// inside them can execute faster.
-function emitNone(handler, isFn, self) {
-  if (isFn)
-    handler.call(self);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self);
-  }
-}
-function emitOne(handler, isFn, self, arg1) {
-  if (isFn)
-    handler.call(self, arg1);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1);
-  }
-}
-function emitTwo(handler, isFn, self, arg1, arg2) {
-  if (isFn)
-    handler.call(self, arg1, arg2);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1, arg2);
-  }
-}
-function emitThree(handler, isFn, self, arg1, arg2, arg3) {
-  if (isFn)
-    handler.call(self, arg1, arg2, arg3);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1, arg2, arg3);
-  }
-}
-
-function emitMany(handler, isFn, self, args) {
-  if (isFn)
-    handler.apply(self, args);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].apply(self, args);
-  }
-}
-
-EventEmitter.prototype.emit = function emit(type) {
-  var er, handler, len, args, i, events;
-  var doError = (type === 'error');
-
-  events = this._events;
-  if (events)
-    doError = (doError && events.error == null);
-  else if (!doError)
-    return false;
-
-  // If there is no 'error' event listener then throw.
-  if (doError) {
-    if (arguments.length > 1)
-      er = arguments[1];
-    if (er instanceof Error) {
-      throw er; // Unhandled 'error' event
-    } else {
-      // At least give some kind of context to the user
-      var err = new Error('Unhandled "error" event. (' + er + ')');
-      err.context = er;
-      throw err;
-    }
-    return false;
-  }
-
-  handler = events[type];
-
-  if (!handler)
-    return false;
-
-  var isFn = typeof handler === 'function';
-  len = arguments.length;
-  switch (len) {
-      // fast cases
-    case 1:
-      emitNone(handler, isFn, this);
-      break;
-    case 2:
-      emitOne(handler, isFn, this, arguments[1]);
-      break;
-    case 3:
-      emitTwo(handler, isFn, this, arguments[1], arguments[2]);
-      break;
-    case 4:
-      emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
-      break;
-      // slower
-    default:
-      args = new Array(len - 1);
-      for (i = 1; i < len; i++)
-        args[i - 1] = arguments[i];
-      emitMany(handler, isFn, this, args);
-  }
-
-  return true;
-};
-
-function _addListener(target, type, listener, prepend) {
-  var m;
-  var events;
-  var existing;
-
-  if (typeof listener !== 'function')
-    throw new TypeError('"listener" argument must be a function');
-
-  events = target._events;
-  if (!events) {
-    events = target._events = objectCreate(null);
-    target._eventsCount = 0;
-  } else {
-    // To avoid recursion in the case that type === "newListener"! Before
-    // adding it to the listeners, first emit "newListener".
-    if (events.newListener) {
-      target.emit('newListener', type,
-          listener.listener ? listener.listener : listener);
-
-      // Re-assign `events` because a newListener handler could have caused the
-      // this._events to be assigned to a new object
-      events = target._events;
-    }
-    existing = events[type];
-  }
-
-  if (!existing) {
-    // Optimize the case of one listener. Don't need the extra array object.
-    existing = events[type] = listener;
-    ++target._eventsCount;
-  } else {
-    if (typeof existing === 'function') {
-      // Adding the second element, need to change to array.
-      existing = events[type] =
-          prepend ? [listener, existing] : [existing, listener];
-    } else {
-      // If we've already got an array, just append.
-      if (prepend) {
-        existing.unshift(listener);
-      } else {
-        existing.push(listener);
-      }
-    }
-
-    // Check for listener leak
-    if (!existing.warned) {
-      m = $getMaxListeners(target);
-      if (m && m > 0 && existing.length > m) {
-        existing.warned = true;
-        var w = new Error('Possible EventEmitter memory leak detected. ' +
-            existing.length + ' "' + String(type) + '" listeners ' +
-            'added. Use emitter.setMaxListeners() to ' +
-            'increase limit.');
-        w.name = 'MaxListenersExceededWarning';
-        w.emitter = target;
-        w.type = type;
-        w.count = existing.length;
-        if (typeof console === 'object' && console.warn) {
-          console.warn('%s: %s', w.name, w.message);
-        }
-      }
-    }
-  }
-
-  return target;
-}
-
-EventEmitter.prototype.addListener = function addListener(type, listener) {
-  return _addListener(this, type, listener, false);
-};
-
-EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-EventEmitter.prototype.prependListener =
-    function prependListener(type, listener) {
-      return _addListener(this, type, listener, true);
-    };
-
-function onceWrapper() {
-  if (!this.fired) {
-    this.target.removeListener(this.type, this.wrapFn);
-    this.fired = true;
-    switch (arguments.length) {
-      case 0:
-        return this.listener.call(this.target);
-      case 1:
-        return this.listener.call(this.target, arguments[0]);
-      case 2:
-        return this.listener.call(this.target, arguments[0], arguments[1]);
-      case 3:
-        return this.listener.call(this.target, arguments[0], arguments[1],
-            arguments[2]);
-      default:
-        var args = new Array(arguments.length);
-        for (var i = 0; i < args.length; ++i)
-          args[i] = arguments[i];
-        this.listener.apply(this.target, args);
-    }
-  }
-}
-
-function _onceWrap(target, type, listener) {
-  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
-  var wrapped = bind.call(onceWrapper, state);
-  wrapped.listener = listener;
-  state.wrapFn = wrapped;
-  return wrapped;
-}
-
-EventEmitter.prototype.once = function once(type, listener) {
-  if (typeof listener !== 'function')
-    throw new TypeError('"listener" argument must be a function');
-  this.on(type, _onceWrap(this, type, listener));
-  return this;
-};
-
-EventEmitter.prototype.prependOnceListener =
-    function prependOnceListener(type, listener) {
-      if (typeof listener !== 'function')
-        throw new TypeError('"listener" argument must be a function');
-      this.prependListener(type, _onceWrap(this, type, listener));
-      return this;
-    };
-
-// Emits a 'removeListener' event if and only if the listener was removed.
-EventEmitter.prototype.removeListener =
-    function removeListener(type, listener) {
-      var list, events, position, i, originalListener;
-
-      if (typeof listener !== 'function')
-        throw new TypeError('"listener" argument must be a function');
-
-      events = this._events;
-      if (!events)
-        return this;
-
-      list = events[type];
-      if (!list)
-        return this;
-
-      if (list === listener || list.listener === listener) {
-        if (--this._eventsCount === 0)
-          this._events = objectCreate(null);
-        else {
-          delete events[type];
-          if (events.removeListener)
-            this.emit('removeListener', type, list.listener || listener);
-        }
-      } else if (typeof list !== 'function') {
-        position = -1;
-
-        for (i = list.length - 1; i >= 0; i--) {
-          if (list[i] === listener || list[i].listener === listener) {
-            originalListener = list[i].listener;
-            position = i;
-            break;
-          }
-        }
-
-        if (position < 0)
-          return this;
-
-        if (position === 0)
-          list.shift();
-        else
-          spliceOne(list, position);
-
-        if (list.length === 1)
-          events[type] = list[0];
-
-        if (events.removeListener)
-          this.emit('removeListener', type, originalListener || listener);
-      }
-
-      return this;
-    };
-
-EventEmitter.prototype.removeAllListeners =
-    function removeAllListeners(type) {
-      var listeners, events, i;
-
-      events = this._events;
-      if (!events)
-        return this;
-
-      // not listening for removeListener, no need to emit
-      if (!events.removeListener) {
-        if (arguments.length === 0) {
-          this._events = objectCreate(null);
-          this._eventsCount = 0;
-        } else if (events[type]) {
-          if (--this._eventsCount === 0)
-            this._events = objectCreate(null);
-          else
-            delete events[type];
-        }
-        return this;
-      }
-
-      // emit removeListener for all listeners on all events
-      if (arguments.length === 0) {
-        var keys = objectKeys(events);
-        var key;
-        for (i = 0; i < keys.length; ++i) {
-          key = keys[i];
-          if (key === 'removeListener') continue;
-          this.removeAllListeners(key);
-        }
-        this.removeAllListeners('removeListener');
-        this._events = objectCreate(null);
-        this._eventsCount = 0;
-        return this;
-      }
-
-      listeners = events[type];
-
-      if (typeof listeners === 'function') {
-        this.removeListener(type, listeners);
-      } else if (listeners) {
-        // LIFO order
-        for (i = listeners.length - 1; i >= 0; i--) {
-          this.removeListener(type, listeners[i]);
-        }
-      }
-
-      return this;
-    };
-
-function _listeners(target, type, unwrap) {
-  var events = target._events;
-
-  if (!events)
-    return [];
-
-  var evlistener = events[type];
-  if (!evlistener)
-    return [];
-
-  if (typeof evlistener === 'function')
-    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
-
-  return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
-}
-
-EventEmitter.prototype.listeners = function listeners(type) {
-  return _listeners(this, type, true);
-};
-
-EventEmitter.prototype.rawListeners = function rawListeners(type) {
-  return _listeners(this, type, false);
-};
-
-EventEmitter.listenerCount = function(emitter, type) {
-  if (typeof emitter.listenerCount === 'function') {
-    return emitter.listenerCount(type);
-  } else {
-    return listenerCount.call(emitter, type);
-  }
-};
-
-EventEmitter.prototype.listenerCount = listenerCount;
-function listenerCount(type) {
-  var events = this._events;
-
-  if (events) {
-    var evlistener = events[type];
-
-    if (typeof evlistener === 'function') {
-      return 1;
-    } else if (evlistener) {
-      return evlistener.length;
-    }
-  }
-
-  return 0;
-}
-
-EventEmitter.prototype.eventNames = function eventNames() {
-  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
-};
-
-// About 1.5x faster than the two-arg version of Array#splice().
-function spliceOne(list, index) {
-  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
-    list[i] = list[k];
-  list.pop();
-}
-
-function arrayClone(arr, n) {
-  var copy = new Array(n);
-  for (var i = 0; i < n; ++i)
-    copy[i] = arr[i];
-  return copy;
-}
-
-function unwrapListeners(arr) {
-  var ret = new Array(arr.length);
-  for (var i = 0; i < ret.length; ++i) {
-    ret[i] = arr[i].listener || arr[i];
-  }
-  return ret;
-}
-
-function objectCreatePolyfill(proto) {
-  var F = function() {};
-  F.prototype = proto;
-  return new F;
-}
-function objectKeysPolyfill(obj) {
-  var keys = [];
-  for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) {
-    keys.push(k);
-  }
-  return k;
-}
-function functionBindPolyfill(context) {
-  var fn = this;
-  return function () {
-    return fn.apply(context, arguments);
-  };
-}
-
-},{}],6:[function(require,module,exports){
-exports.read = function (buffer, offset, isLE, mLen, nBytes) {
-  var e, m
-  var eLen = (nBytes * 8) - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var nBits = -7
-  var i = isLE ? (nBytes - 1) : 0
-  var d = isLE ? -1 : 1
-  var s = buffer[offset + i]
-
-  i += d
-
-  e = s & ((1 << (-nBits)) - 1)
-  s >>= (-nBits)
-  nBits += eLen
-  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
-
-  m = e & ((1 << (-nBits)) - 1)
-  e >>= (-nBits)
-  nBits += mLen
-  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
-
-  if (e === 0) {
-    e = 1 - eBias
-  } else if (e === eMax) {
-    return m ? NaN : ((s ? -1 : 1) * Infinity)
-  } else {
-    m = m + Math.pow(2, mLen)
-    e = e - eBias
-  }
-  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-}
-
-exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
-  var e, m, c
-  var eLen = (nBytes * 8) - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
-  var i = isLE ? 0 : (nBytes - 1)
-  var d = isLE ? 1 : -1
-  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
-
-  value = Math.abs(value)
-
-  if (isNaN(value) || value === Infinity) {
-    m = isNaN(value) ? 1 : 0
-    e = eMax
-  } else {
-    e = Math.floor(Math.log(value) / Math.LN2)
-    if (value * (c = Math.pow(2, -e)) < 1) {
-      e--
-      c *= 2
-    }
-    if (e + eBias >= 1) {
-      value += rt / c
-    } else {
-      value += rt * Math.pow(2, 1 - eBias)
-    }
-    if (value * c >= 2) {
-      e++
-      c /= 2
-    }
-
-    if (e + eBias >= eMax) {
-      m = 0
-      e = eMax
-    } else if (e + eBias >= 1) {
-      m = ((value * c) - 1) * Math.pow(2, mLen)
-      e = e + eBias
-    } else {
-      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
-      e = 0
-    }
-  }
-
-  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
-
-  e = (e << mLen) | m
-  eLen += mLen
-  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
-
-  buffer[offset + i - d] |= s * 128
-}
-
-},{}],7:[function(require,module,exports){
-if (typeof Object.create === 'function') {
-  // implementation from standard node.js 'util' module
-  module.exports = function inherits(ctor, superCtor) {
-    if (superCtor) {
-      ctor.super_ = superCtor
-      ctor.prototype = Object.create(superCtor.prototype, {
-        constructor: {
-          value: ctor,
-          enumerable: false,
-          writable: true,
-          configurable: true
-        }
-      })
-    }
-  };
-} else {
-  // old school shim for old browsers
-  module.exports = function inherits(ctor, superCtor) {
-    if (superCtor) {
-      ctor.super_ = superCtor
-      var TempCtor = function () {}
-      TempCtor.prototype = superCtor.prototype
-      ctor.prototype = new TempCtor()
-      ctor.prototype.constructor = ctor
-    }
-  }
-}
-
-},{}],8:[function(require,module,exports){
-/*!
- * Determine if an object is a Buffer
- *
- * @author   Feross Aboukhadijeh <https://feross.org>
- * @license  MIT
- */
-
-// The _isBuffer check is for Safari 5-7 support, because it's missing
-// Object.prototype.constructor. Remove this eventually
-module.exports = function (obj) {
-  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
-}
-
-function isBuffer (obj) {
-  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
-}
-
-// For Node v0.10 support. Remove this eventually.
-function isSlowBuffer (obj) {
-  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
-}
-
-},{}],9:[function(require,module,exports){
-var toString = {}.toString;
-
-module.exports = Array.isArray || function (arr) {
-  return toString.call(arr) == '[object Array]';
-};
-
-},{}],10:[function(require,module,exports){
-(function (process){
-'use strict';
-
-if (typeof process === 'undefined' ||
-    !process.version ||
-    process.version.indexOf('v0.') === 0 ||
-    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
-  module.exports = { nextTick: nextTick };
-} else {
-  module.exports = process
-}
-
-function nextTick(fn, arg1, arg2, arg3) {
-  if (typeof fn !== 'function') {
-    throw new TypeError('"callback" argument must be a function');
-  }
-  var len = arguments.length;
-  var args, i;
-  switch (len) {
-  case 0:
-  case 1:
-    return process.nextTick(fn);
-  case 2:
-    return process.nextTick(function afterTickOne() {
-      fn.call(null, arg1);
-    });
-  case 3:
-    return process.nextTick(function afterTickTwo() {
-      fn.call(null, arg1, arg2);
-    });
-  case 4:
-    return process.nextTick(function afterTickThree() {
-      fn.call(null, arg1, arg2, arg3);
-    });
-  default:
-    args = new Array(len - 1);
-    i = 0;
-    while (i < args.length) {
-      args[i++] = arguments[i];
-    }
-    return process.nextTick(function afterTick() {
-      fn.apply(null, args);
-    });
-  }
-}
-
-
-}).call(this,require('_process'))
-},{"_process":11}],11:[function(require,module,exports){
-// shim for using process in browser
-var process = module.exports = {};
-
-// cached from whatever global is present so that test runners that stub it
-// don't break things.  But we need to wrap it in a try catch in case it is
-// wrapped in strict mode code which doesn't define any globals.  It's inside a
-// function because try/catches deoptimize in certain engines.
-
-var cachedSetTimeout;
-var cachedClearTimeout;
-
-function defaultSetTimout() {
-    throw new Error('setTimeout has not been defined');
-}
-function defaultClearTimeout () {
-    throw new Error('clearTimeout has not been defined');
-}
-(function () {
-    try {
-        if (typeof setTimeout === 'function') {
-            cachedSetTimeout = setTimeout;
-        } else {
-            cachedSetTimeout = defaultSetTimout;
-        }
-    } catch (e) {
-        cachedSetTimeout = defaultSetTimout;
-    }
-    try {
-        if (typeof clearTimeout === 'function') {
-            cachedClearTimeout = clearTimeout;
-        } else {
-            cachedClearTimeout = defaultClearTimeout;
-        }
-    } catch (e) {
-        cachedClearTimeout = defaultClearTimeout;
-    }
-} ())
-function runTimeout(fun) {
-    if (cachedSetTimeout === setTimeout) {
-        //normal enviroments in sane situations
-        return setTimeout(fun, 0);
-    }
-    // if setTimeout wasn't available but was latter defined
-    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-        cachedSetTimeout = setTimeout;
-        return setTimeout(fun, 0);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedSetTimeout(fun, 0);
-    } catch(e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-            return cachedSetTimeout.call(null, fun, 0);
-        } catch(e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-            return cachedSetTimeout.call(this, fun, 0);
-        }
-    }
-
-
-}
-function runClearTimeout(marker) {
-    if (cachedClearTimeout === clearTimeout) {
-        //normal enviroments in sane situations
-        return clearTimeout(marker);
-    }
-    // if clearTimeout wasn't available but was latter defined
-    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-        cachedClearTimeout = clearTimeout;
-        return clearTimeout(marker);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedClearTimeout(marker);
-    } catch (e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-            return cachedClearTimeout.call(null, marker);
-        } catch (e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-            return cachedClearTimeout.call(this, marker);
-        }
-    }
-
-
-
-}
-var queue = [];
-var draining = false;
-var currentQueue;
-var queueIndex = -1;
-
-function cleanUpNextTick() {
-    if (!draining || !currentQueue) {
-        return;
-    }
-    draining = false;
-    if (currentQueue.length) {
-        queue = currentQueue.concat(queue);
-    } else {
-        queueIndex = -1;
-    }
-    if (queue.length) {
-        drainQueue();
-    }
-}
-
-function drainQueue() {
-    if (draining) {
-        return;
-    }
-    var timeout = runTimeout(cleanUpNextTick);
-    draining = true;
-
-    var len = queue.length;
-    while(len) {
-        currentQueue = queue;
-        queue = [];
-        while (++queueIndex < len) {
-            if (currentQueue) {
-                currentQueue[queueIndex].run();
-            }
-        }
-        queueIndex = -1;
-        len = queue.length;
-    }
-    currentQueue = null;
-    draining = false;
-    runClearTimeout(timeout);
-}
-
-process.nextTick = function (fun) {
-    var args = new Array(arguments.length - 1);
-    if (arguments.length > 1) {
-        for (var i = 1; i < arguments.length; i++) {
-            args[i - 1] = arguments[i];
-        }
-    }
-    queue.push(new Item(fun, args));
-    if (queue.length === 1 && !draining) {
-        runTimeout(drainQueue);
-    }
-};
-
-// v8 likes predictible objects
-function Item(fun, array) {
-    this.fun = fun;
-    this.array = array;
-}
-Item.prototype.run = function () {
-    this.fun.apply(null, this.array);
-};
-process.title = 'browser';
-process.browser = true;
-process.env = {};
-process.argv = [];
-process.version = ''; // empty string to avoid regexp issues
-process.versions = {};
-
-function noop() {}
-
-process.on = noop;
-process.addListener = noop;
-process.once = noop;
-process.off = noop;
-process.removeListener = noop;
-process.removeAllListeners = noop;
-process.emit = noop;
-process.prependListener = noop;
-process.prependOnceListener = noop;
-
-process.listeners = function (name) { return [] }
-
-process.binding = function (name) {
-    throw new Error('process.binding is not supported');
-};
-
-process.cwd = function () { return '/' };
-process.chdir = function (dir) {
-    throw new Error('process.chdir is not supported');
-};
-process.umask = function() { return 0; };
-
-},{}],12:[function(require,module,exports){
-module.exports = require('./lib/_stream_duplex.js');
-
-},{"./lib/_stream_duplex.js":13}],13:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
-
-module.exports = Duplex;
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-var Readable = require('./_stream_readable');
-var Writable = require('./_stream_writable');
-
-util.inherits(Duplex, Readable);
-
-{
-  // avoid scope creep, the keys array can then be collected
-  var keys = objectKeys(Writable.prototype);
-  for (var v = 0; v < keys.length; v++) {
-    var method = keys[v];
-    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-  }
-}
-
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
-
-  Readable.call(this, options);
-  Writable.call(this, options);
-
-  if (options && options.readable === false) this.readable = false;
-
-  if (options && options.writable === false) this.writable = false;
-
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-  this.once('end', onend);
-}
-
-Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._writableState.highWaterMark;
-  }
-});
-
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
-
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  pna.nextTick(onEndNT, this);
-}
-
-function onEndNT(self) {
-  self.end();
-}
-
-Object.defineProperty(Duplex.prototype, 'destroyed', {
-  get: function () {
-    if (this._readableState === undefined || this._writableState === undefined) {
-      return false;
-    }
-    return this._readableState.destroyed && this._writableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (this._readableState === undefined || this._writableState === undefined) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._readableState.destroyed = value;
-    this._writableState.destroyed = value;
-  }
-});
-
-Duplex.prototype._destroy = function (err, cb) {
-  this.push(null);
-  this.end();
-
-  pna.nextTick(cb, err);
-};
-},{"./_stream_readable":15,"./_stream_writable":17,"core-util-is":4,"inherits":7,"process-nextick-args":10}],14:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
-
-'use strict';
-
-module.exports = PassThrough;
-
-var Transform = require('./_stream_transform');
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(PassThrough, Transform);
-
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-  Transform.call(this, options);
-}
-
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
-},{"./_stream_transform":16,"core-util-is":4,"inherits":7}],15:[function(require,module,exports){
-(function (process,global){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-module.exports = Readable;
-
-/*<replacement>*/
-var isArray = require('isarray');
-/*</replacement>*/
-
-/*<replacement>*/
-var Duplex;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-
-/*<replacement>*/
-var EE = require('events').EventEmitter;
-
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream = require('./internal/streams/stream');
-/*</replacement>*/
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-var OurUint8Array = global.Uint8Array || function () {};
-function _uint8ArrayToBuffer(chunk) {
-  return Buffer.from(chunk);
-}
-function _isUint8Array(obj) {
-  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
-}
-
-/*</replacement>*/
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var debugUtil = require('util');
-var debug = void 0;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
-
-var BufferList = require('./internal/streams/BufferList');
-var destroyImpl = require('./internal/streams/destroy');
-var StringDecoder;
-
-util.inherits(Readable, Stream);
-
-var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
-
-function prependListener(emitter, event, fn) {
-  // Sadly this is not cacheable as some libraries bundle their own
-  // event emitter implementation with them.
-  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);
-
-  // This is a hack to make sure that our error handler is attached before any
-  // userland ones.  NEVER DO THIS. This is here only because this code needs
-  // to continue to work with older versions of Node.js that do not include
-  // the prependListener() method. The goal is to eventually remove this hack.
-  if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
-}
-
-function ReadableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // Duplex streams are both readable and writable, but share
-  // the same options object.
-  // However, some cases require setting options to different
-  // values for the readable and the writable sides of the duplex stream.
-  // These options can be provided separately as readableXXX and writableXXX.
-  var isDuplex = stream instanceof Duplex;
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var readableHwm = options.readableHighWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-
-  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = Math.floor(this.highWaterMark);
-
-  // A linked list is used to store data chunks instead of an array because the
-  // linked list can remove elements from the beginning faster than
-  // array.shift()
-  this.buffer = new BufferList();
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
-
-  // a flag to be able to tell if the event 'readable'/'data' is emitted
-  // immediately, or on a later tick.  We set this to true at first, because
-  // any actions that shouldn't happen until "later" should generally also
-  // not happen before the first read call.
-  this.sync = true;
-
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
-
-  // has it been destroyed
-  this.destroyed = false;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
-
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
-
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
-
-function Readable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  if (!(this instanceof Readable)) return new Readable(options);
-
-  this._readableState = new ReadableState(options, this);
-
-  // legacy
-  this.readable = true;
-
-  if (options) {
-    if (typeof options.read === 'function') this._read = options.read;
-
-    if (typeof options.destroy === 'function') this._destroy = options.destroy;
-  }
-
-  Stream.call(this);
-}
-
-Object.defineProperty(Readable.prototype, 'destroyed', {
-  get: function () {
-    if (this._readableState === undefined) {
-      return false;
-    }
-    return this._readableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (!this._readableState) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._readableState.destroyed = value;
-  }
-});
-
-Readable.prototype.destroy = destroyImpl.destroy;
-Readable.prototype._undestroy = destroyImpl.undestroy;
-Readable.prototype._destroy = function (err, cb) {
-  this.push(null);
-  cb(err);
-};
-
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
-  var skipChunkCheck;
-
-  if (!state.objectMode) {
-    if (typeof chunk === 'string') {
-      encoding = encoding || state.defaultEncoding;
-      if (encoding !== state.encoding) {
-        chunk = Buffer.from(chunk, encoding);
-        encoding = '';
-      }
-      skipChunkCheck = true;
-    }
-  } else {
-    skipChunkCheck = true;
-  }
-
-  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
-};
-
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  return readableAddChunk(this, chunk, null, true, false);
-};
-
-function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
-  var state = stream._readableState;
-  if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else {
-    var er;
-    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
-    if (er) {
-      stream.emit('error', er);
-    } else if (state.objectMode || chunk && chunk.length > 0) {
-      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
-        chunk = _uint8ArrayToBuffer(chunk);
-      }
-
-      if (addToFront) {
-        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
-      } else if (state.ended) {
-        stream.emit('error', new Error('stream.push() after EOF'));
-      } else {
-        state.reading = false;
-        if (state.decoder && !encoding) {
-          chunk = state.decoder.write(chunk);
-          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
-        } else {
-          addChunk(stream, state, chunk, false);
-        }
-      }
-    } else if (!addToFront) {
-      state.reading = false;
-    }
-  }
-
-  return needMoreData(state);
-}
-
-function addChunk(stream, state, chunk, addToFront) {
-  if (state.flowing && state.length === 0 && !state.sync) {
-    stream.emit('data', chunk);
-    stream.read(0);
-  } else {
-    // update the buffer info.
-    state.length += state.objectMode ? 1 : chunk.length;
-    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-    if (state.needReadable) emitReadable(stream);
-  }
-  maybeReadMore(stream, state);
-}
-
-function chunkInvalid(state, chunk) {
-  var er;
-  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
-
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
-
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2 to prevent increasing hwm excessively in
-    // tiny amounts
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
-  }
-  return n;
-}
-
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function howMuchToRead(n, state) {
-  if (n <= 0 || state.length === 0 && state.ended) return 0;
-  if (state.objectMode) return 1;
-  if (n !== n) {
-    // Only flow one buffer at a time
-    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
-  }
-  // If we're asking for more than the current hwm, then raise the hwm.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-  if (n <= state.length) return n;
-  // Don't have enough
-  if (!state.ended) {
-    state.needReadable = true;
-    return 0;
-  }
-  return state.length;
-}
-
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  n = parseInt(n, 10);
-  var state = this._readableState;
-  var nOrig = n;
-
-  if (n !== 0) state.emittedReadable = false;
-
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
-  }
-
-  n = howMuchToRead(n, state);
-
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
-  }
-
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
-
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
-
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
-
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
-  } else if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
-    // If _read pushed data synchronously, then `reading` will be false,
-    // and we need to re-evaluate how much data we can return to the user.
-    if (!state.reading) n = howMuchToRead(nOrig, state);
-  }
-
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
-
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
-  } else {
-    state.length -= n;
-  }
-
-  if (state.length === 0) {
-    // If we have nothing in the buffer, then we want to know
-    // as soon as we *do* get something into the buffer.
-    if (!state.ended) state.needReadable = true;
-
-    // If we tried to read() past the EOF, then emit end on the next tick.
-    if (nOrig !== n && state.ended) endReadable(this);
-  }
-
-  if (ret !== null) this.emit('data', ret);
-
-  return ret;
-};
-
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
-  }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
-}
-
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);
-  }
-}
-
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
-}
-
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    pna.nextTick(maybeReadMore_, stream, state);
-  }
-}
-
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
-  }
-  state.readingMore = false;
-}
-
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('_read() is not implemented'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
-
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
-
-  var endFn = doEnd ? onend : unpipe;
-  if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn);
-
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable, unpipeInfo) {
-    debug('onunpipe');
-    if (readable === src) {
-      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
-        unpipeInfo.hasUnpiped = true;
-        cleanup();
-      }
-    }
-  }
-
-  function onend() {
-    debug('onend');
-    dest.end();
-  }
-
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
-
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', unpipe);
-    src.removeListener('data', ondata);
-
-    cleanedUp = true;
-
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
-
-  // If the user pushes more data while we're writing to dest then we'll end up
-  // in ondata again. However, we only want to increase awaitDrain once because
-  // dest will only emit one 'drain' event for the multiple writes.
-  // => Introduce a guard on increasing awaitDrain.
-  var increasedAwaitDrain = false;
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    increasedAwaitDrain = false;
-    var ret = dest.write(chunk);
-    if (false === ret && !increasedAwaitDrain) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      // => Check whether `dest` is still a piping destination.
-      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-        increasedAwaitDrain = true;
-      }
-      src.pause();
-    }
-  }
-
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-
-  // Make sure our error handler is attached before userland ones.
-  prependListener(dest, 'error', onerror);
-
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
-  }
-  dest.once('finish', onfinish);
-
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
-
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
-
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
-
-  return dest;
-};
-
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
-
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
-  var unpipeInfo = { hasUnpiped: false };
-
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
-
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
-
-    if (!dest) dest = state.pipes;
-
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this, unpipeInfo);
-    return this;
-  }
-
-  // slow case. multiple pipe destinations.
-
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-
-    for (var i = 0; i < len; i++) {
-      dests[i].emit('unpipe', this, unpipeInfo);
-    }return this;
-  }
-
-  // try to find the right one.
-  var index = indexOf(state.pipes, dest);
-  if (index === -1) return this;
-
-  state.pipes.splice(index, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-  dest.emit('unpipe', this, unpipeInfo);
-
-  return this;
-};
-
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
-
-  if (ev === 'data') {
-    // Start flowing on next tick if stream isn't explicitly paused
-    if (this._readableState.flowing !== false) this.resume();
-  } else if (ev === 'readable') {
-    var state = this._readableState;
-    if (!state.endEmitted && !state.readableListening) {
-      state.readableListening = state.needReadable = true;
-      state.emittedReadable = false;
-      if (!state.reading) {
-        pna.nextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this);
-      }
-    }
-  }
-
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
-
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
-
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
-
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    pna.nextTick(resume_, stream, state);
-  }
-}
-
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  state.awaitDrain = 0;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
-
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  while (state.flowing && stream.read() !== null) {}
-}
-
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var _this = this;
-
-  var state = this._readableState;
-  var paused = false;
-
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) _this.push(chunk);
-    }
-
-    _this.push(null);
-  });
-
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
-
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-    var ret = _this.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
-    }
-  });
-
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
-    }
-  }
-
-  // proxy certain important events.
-  for (var n = 0; n < kProxyEvents.length; n++) {
-    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
-  }
-
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  this._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
-    }
-  };
-
-  return this;
-};
-
-Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._readableState.highWaterMark;
-  }
-});
-
-// exposed for testing purposes only.
-Readable._fromList = fromList;
-
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function fromList(n, state) {
-  // nothing buffered
-  if (state.length === 0) return null;
-
-  var ret;
-  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
-    // read it all, truncate the list
-    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
-    state.buffer.clear();
-  } else {
-    // read part of list
-    ret = fromListPartial(n, state.buffer, state.decoder);
-  }
-
-  return ret;
-}
-
-// Extracts only enough buffered data to satisfy the amount requested.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function fromListPartial(n, list, hasStrings) {
-  var ret;
-  if (n < list.head.data.length) {
-    // slice is the same for buffers and strings
-    ret = list.head.data.slice(0, n);
-    list.head.data = list.head.data.slice(n);
-  } else if (n === list.head.data.length) {
-    // first chunk is a perfect match
-    ret = list.shift();
-  } else {
-    // result spans more than one buffer
-    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
-  }
-  return ret;
-}
-
-// Copies a specified amount of characters from the list of buffered data
-// chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBufferString(n, list) {
-  var p = list.head;
-  var c = 1;
-  var ret = p.data;
-  n -= ret.length;
-  while (p = p.next) {
-    var str = p.data;
-    var nb = n > str.length ? str.length : n;
-    if (nb === str.length) ret += str;else ret += str.slice(0, n);
-    n -= nb;
-    if (n === 0) {
-      if (nb === str.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = str.slice(nb);
-      }
-      break;
-    }
-    ++c;
-  }
-  list.length -= c;
-  return ret;
-}
-
-// Copies a specified amount of bytes from the list of buffered data chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBuffer(n, list) {
-  var ret = Buffer.allocUnsafe(n);
-  var p = list.head;
-  var c = 1;
-  p.data.copy(ret);
-  n -= p.data.length;
-  while (p = p.next) {
-    var buf = p.data;
-    var nb = n > buf.length ? buf.length : n;
-    buf.copy(ret, ret.length - n, 0, nb);
-    n -= nb;
-    if (n === 0) {
-      if (nb === buf.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = buf.slice(nb);
-      }
-      break;
-    }
-    ++c;
-  }
-  list.length -= c;
-  return ret;
-}
-
-function endReadable(stream) {
-  var state = stream._readableState;
-
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
-
-  if (!state.endEmitted) {
-    state.ended = true;
-    pna.nextTick(endReadableNT, state, stream);
-  }
-}
-
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
-  }
-}
-
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
-}
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"./_stream_duplex":13,"./internal/streams/BufferList":18,"./internal/streams/destroy":19,"./internal/streams/stream":20,"_process":11,"core-util-is":4,"events":5,"inherits":7,"isarray":9,"process-nextick-args":10,"safe-buffer":21,"string_decoder/":22,"util":2}],16:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
-
-'use strict';
-
-module.exports = Transform;
-
-var Duplex = require('./_stream_duplex');
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(Transform, Duplex);
-
-function afterTransform(er, data) {
-  var ts = this._transformState;
-  ts.transforming = false;
-
-  var cb = ts.writecb;
-
-  if (!cb) {
-    return this.emit('error', new Error('write callback called multiple times'));
-  }
-
-  ts.writechunk = null;
-  ts.writecb = null;
-
-  if (data != null) // single equals check for both `null` and `undefined`
-    this.push(data);
-
-  cb(er);
-
-  var rs = this._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    this._read(rs.highWaterMark);
-  }
-}
-
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
-
-  Duplex.call(this, options);
-
-  this._transformState = {
-    afterTransform: afterTransform.bind(this),
-    needTransform: false,
-    transforming: false,
-    writecb: null,
-    writechunk: null,
-    writeencoding: null
-  };
-
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
-
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
-
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
-
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
-
-  // When the writable side finishes, then flush out anything remaining.
-  this.on('prefinish', prefinish);
-}
-
-function prefinish() {
-  var _this = this;
-
-  if (typeof this._flush === 'function') {
-    this._flush(function (er, data) {
-      done(_this, er, data);
-    });
-  } else {
-    done(this, null, null);
-  }
-}
-
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('_transform() is not implemented');
-};
-
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
-
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
-
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
-
-Transform.prototype._destroy = function (err, cb) {
-  var _this2 = this;
-
-  Duplex.prototype._destroy.call(this, err, function (err2) {
-    cb(err2);
-    _this2.emit('close');
-  });
-};
-
-function done(stream, er, data) {
-  if (er) return stream.emit('error', er);
-
-  if (data != null) // single equals check for both `null` and `undefined`
-    stream.push(data);
-
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');
-
-  if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');
-
-  return stream.push(null);
-}
-},{"./_stream_duplex":13,"core-util-is":4,"inherits":7}],17:[function(require,module,exports){
-(function (process,global,setImmediate){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-module.exports = Writable;
-
-/* <replacement> */
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
-
-  this.next = null;
-  this.entry = null;
-  this.finish = function () {
-    onCorkedFinish(_this, state);
-  };
-}
-/* </replacement> */
-
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
-/*</replacement>*/
-
-/*<replacement>*/
-var Duplex;
-/*</replacement>*/
-
-Writable.WritableState = WritableState;
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var internalUtil = {
-  deprecate: require('util-deprecate')
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream = require('./internal/streams/stream');
-/*</replacement>*/
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-var OurUint8Array = global.Uint8Array || function () {};
-function _uint8ArrayToBuffer(chunk) {
-  return Buffer.from(chunk);
-}
-function _isUint8Array(obj) {
-  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
-}
-
-/*</replacement>*/
-
-var destroyImpl = require('./internal/streams/destroy');
-
-util.inherits(Writable, Stream);
-
-function nop() {}
-
-function WritableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // Duplex streams are both readable and writable, but share
-  // the same options object.
-  // However, some cases require setting options to different
-  // values for the readable and the writable sides of the duplex stream.
-  // These options can be provided separately as readableXXX and writableXXX.
-  var isDuplex = stream instanceof Duplex;
-
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
-
-  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var writableHwm = options.writableHighWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-
-  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = Math.floor(this.highWaterMark);
-
-  // if _final has been called
-  this.finalCalled = false;
-
-  // drain event flag.
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
-
-  // has it been destroyed
-  this.destroyed = false;
-
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
-
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
-
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
-
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
-
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
-
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
-
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
-
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
-
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
-
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
-
-  // count buffered requests
-  this.bufferedRequestCount = 0;
-
-  // allocate the first CorkedRequest, there is always
-  // one allocated and free to use, and we maintain at most two
-  this.corkedRequestsFree = new CorkedRequest(this);
-}
-
-WritableState.prototype.getBuffer = function getBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
-
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
-    });
-  } catch (_) {}
-})();
-
-// Test _writableState for inheritance to account for Duplex streams,
-// whose prototype chain only points to Readable.
-var realHasInstance;
-if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
-  realHasInstance = Function.prototype[Symbol.hasInstance];
-  Object.defineProperty(Writable, Symbol.hasInstance, {
-    value: function (object) {
-      if (realHasInstance.call(this, object)) return true;
-      if (this !== Writable) return false;
-
-      return object && object._writableState instanceof WritableState;
-    }
-  });
-} else {
-  realHasInstance = function (object) {
-    return object instanceof this;
-  };
-}
-
-function Writable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  // Writable ctor is applied to Duplexes, too.
-  // `realHasInstance` is necessary because using plain `instanceof`
-  // would return false, as no `_writableState` property is attached.
-
-  // Trying to use the custom `instanceof` for Writable here will also break the
-  // Node.js LazyTransform implementation, which has a non-trivial getter for
-  // `_writableState` that would lead to infinite recursion.
-  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
-    return new Writable(options);
-  }
-
-  this._writableState = new WritableState(options, this);
-
-  // legacy.
-  this.writable = true;
-
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
-
-    if (typeof options.writev === 'function') this._writev = options.writev;
-
-    if (typeof options.destroy === 'function') this._destroy = options.destroy;
-
-    if (typeof options.final === 'function') this._final = options.final;
-  }
-
-  Stream.call(this);
-}
-
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe, not readable'));
-};
-
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  pna.nextTick(cb, er);
-}
-
-// Checks that a user-supplied chunk is valid, especially for the particular
-// mode the stream is in. Currently this means that `null` is never accepted
-// and undefined/non-string values are only allowed in object mode.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
-  var er = false;
-
-  if (chunk === null) {
-    er = new TypeError('May not write null values to stream');
-  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  if (er) {
-    stream.emit('error', er);
-    pna.nextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
-
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
-  var isBuf = !state.objectMode && _isUint8Array(chunk);
-
-  if (isBuf && !Buffer.isBuffer(chunk)) {
-    chunk = _uint8ArrayToBuffer(chunk);
-  }
-
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-  if (typeof cb !== 'function') cb = nop;
-
-  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
-  }
-
-  return ret;
-};
-
-Writable.prototype.cork = function () {
-  var state = this._writableState;
-
-  state.corked++;
-};
-
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
-
-  if (state.corked) {
-    state.corked--;
-
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
-
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-  return this;
-};
-
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = Buffer.from(chunk, encoding);
-  }
-  return chunk;
-}
-
-Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._writableState.highWaterMark;
-  }
-});
-
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
-  if (!isBuf) {
-    var newChunk = decodeChunk(state, chunk, encoding);
-    if (chunk !== newChunk) {
-      isBuf = true;
-      encoding = 'buffer';
-      chunk = newChunk;
-    }
-  }
-  var len = state.objectMode ? 1 : chunk.length;
-
-  state.length += len;
-
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
-
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = {
-      chunk: chunk,
-      encoding: encoding,
-      isBuf: isBuf,
-      callback: cb,
-      next: null
-    };
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
-
-  return ret;
-}
-
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
-
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-
-  if (sync) {
-    // defer the callback if we are being called synchronously
-    // to avoid piling up things on the stack
-    pna.nextTick(cb, er);
-    // this can emit finish, and it will always happen
-    // after error
-    pna.nextTick(finishMaybe, stream, state);
-    stream._writableState.errorEmitted = true;
-    stream.emit('error', er);
-  } else {
-    // the caller expect this to happen before if
-    // it is async
-    cb(er);
-    stream._writableState.errorEmitted = true;
-    stream.emit('error', er);
-    // this can emit finish, but finish must
-    // always follow error
-    finishMaybe(stream, state);
-  }
-}
-
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
-
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
-
-  onwriteStateUpdate(state);
-
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
-
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
-
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-      afterWrite(stream, state, finished, cb);
-    }
-  }
-}
-
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
-
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
-
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
-
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
-
-    var count = 0;
-    var allBuffers = true;
-    while (entry) {
-      buffer[count] = entry;
-      if (!entry.isBuf) allBuffers = false;
-      entry = entry.next;
-      count += 1;
-    }
-    buffer.allBuffers = allBuffers;
-
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-    // doWrite is almost always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    if (holder.next) {
-      state.corkedRequestsFree = holder.next;
-      holder.next = null;
-    } else {
-      state.corkedRequestsFree = new CorkedRequest(state);
-    }
-    state.bufferedRequestCount = 0;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
-
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      state.bufferedRequestCount--;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
-
-    if (entry === null) state.lastBufferedRequest = null;
-  }
-
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
-
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('_write() is not implemented'));
-};
-
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
-
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
-
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
-
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-}
-function callFinal(stream, state) {
-  stream._final(function (err) {
-    state.pendingcb--;
-    if (err) {
-      stream.emit('error', err);
-    }
-    state.prefinished = true;
-    stream.emit('prefinish');
-    finishMaybe(stream, state);
-  });
-}
-function prefinish(stream, state) {
-  if (!state.prefinished && !state.finalCalled) {
-    if (typeof stream._final === 'function') {
-      state.pendingcb++;
-      state.finalCalled = true;
-      pna.nextTick(callFinal, stream, state);
-    } else {
-      state.prefinished = true;
-      stream.emit('prefinish');
-    }
-  }
-}
-
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    prefinish(stream, state);
-    if (state.pendingcb === 0) {
-      state.finished = true;
-      stream.emit('finish');
-    }
-  }
-  return need;
-}
-
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
-
-function onCorkedFinish(corkReq, state, err) {
-  var entry = corkReq.entry;
-  corkReq.entry = null;
-  while (entry) {
-    var cb = entry.callback;
-    state.pendingcb--;
-    cb(err);
-    entry = entry.next;
-  }
-  if (state.corkedRequestsFree) {
-    state.corkedRequestsFree.next = corkReq;
-  } else {
-    state.corkedRequestsFree = corkReq;
-  }
-}
-
-Object.defineProperty(Writable.prototype, 'destroyed', {
-  get: function () {
-    if (this._writableState === undefined) {
-      return false;
-    }
-    return this._writableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (!this._writableState) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._writableState.destroyed = value;
-  }
-});
-
-Writable.prototype.destroy = destroyImpl.destroy;
-Writable.prototype._undestroy = destroyImpl.undestroy;
-Writable.prototype._destroy = function (err, cb) {
-  this.end();
-  cb(err);
-};
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("timers").setImmediate)
-},{"./_stream_duplex":13,"./internal/streams/destroy":19,"./internal/streams/stream":20,"_process":11,"core-util-is":4,"inherits":7,"process-nextick-args":10,"safe-buffer":21,"timers":28,"util-deprecate":29}],18:[function(require,module,exports){
-'use strict';
-
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-var Buffer = require('safe-buffer').Buffer;
-var util = require('util');
-
-function copyBuffer(src, target, offset) {
-  src.copy(target, offset);
-}
-
-module.exports = function () {
-  function BufferList() {
-    _classCallCheck(this, BufferList);
-
-    this.head = null;
-    this.tail = null;
-    this.length = 0;
-  }
-
-  BufferList.prototype.push = function push(v) {
-    var entry = { data: v, next: null };
-    if (this.length > 0) this.tail.next = entry;else this.head = entry;
-    this.tail = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.unshift = function unshift(v) {
-    var entry = { data: v, next: this.head };
-    if (this.length === 0) this.tail = entry;
-    this.head = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.shift = function shift() {
-    if (this.length === 0) return;
-    var ret = this.head.data;
-    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-    --this.length;
-    return ret;
-  };
-
-  BufferList.prototype.clear = function clear() {
-    this.head = this.tail = null;
-    this.length = 0;
-  };
-
-  BufferList.prototype.join = function join(s) {
-    if (this.length === 0) return '';
-    var p = this.head;
-    var ret = '' + p.data;
-    while (p = p.next) {
-      ret += s + p.data;
-    }return ret;
-  };
-
-  BufferList.prototype.concat = function concat(n) {
-    if (this.length === 0) return Buffer.alloc(0);
-    if (this.length === 1) return this.head.data;
-    var ret = Buffer.allocUnsafe(n >>> 0);
-    var p = this.head;
-    var i = 0;
-    while (p) {
-      copyBuffer(p.data, ret, i);
-      i += p.data.length;
-      p = p.next;
-    }
-    return ret;
-  };
-
-  return BufferList;
-}();
-
-if (util && util.inspect && util.inspect.custom) {
-  module.exports.prototype[util.inspect.custom] = function () {
-    var obj = util.inspect({ length: this.length });
-    return this.constructor.name + ' ' + obj;
-  };
-}
-},{"safe-buffer":21,"util":2}],19:[function(require,module,exports){
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-// undocumented cb() API, needed for core, not for public API
-function destroy(err, cb) {
-  var _this = this;
-
-  var readableDestroyed = this._readableState && this._readableState.destroyed;
-  var writableDestroyed = this._writableState && this._writableState.destroyed;
-
-  if (readableDestroyed || writableDestroyed) {
-    if (cb) {
-      cb(err);
-    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
-      pna.nextTick(emitErrorNT, this, err);
-    }
-    return this;
-  }
-
-  // we set destroyed to true before firing error callbacks in order
-  // to make it re-entrance safe in case destroy() is called within callbacks
-
-  if (this._readableState) {
-    this._readableState.destroyed = true;
-  }
-
-  // if this is a duplex stream mark the writable part as destroyed as well
-  if (this._writableState) {
-    this._writableState.destroyed = true;
-  }
-
-  this._destroy(err || null, function (err) {
-    if (!cb && err) {
-      pna.nextTick(emitErrorNT, _this, err);
-      if (_this._writableState) {
-        _this._writableState.errorEmitted = true;
-      }
-    } else if (cb) {
-      cb(err);
-    }
-  });
-
-  return this;
-}
-
-function undestroy() {
-  if (this._readableState) {
-    this._readableState.destroyed = false;
-    this._readableState.reading = false;
-    this._readableState.ended = false;
-    this._readableState.endEmitted = false;
-  }
-
-  if (this._writableState) {
-    this._writableState.destroyed = false;
-    this._writableState.ended = false;
-    this._writableState.ending = false;
-    this._writableState.finished = false;
-    this._writableState.errorEmitted = false;
-  }
-}
-
-function emitErrorNT(self, err) {
-  self.emit('error', err);
-}
-
-module.exports = {
-  destroy: destroy,
-  undestroy: undestroy
-};
-},{"process-nextick-args":10}],20:[function(require,module,exports){
-module.exports = require('events').EventEmitter;
-
-},{"events":5}],21:[function(require,module,exports){
-/* eslint-disable node/no-deprecated-api */
-var buffer = require('buffer')
-var Buffer = buffer.Buffer
-
-// alternative to using Object.keys for old browsers
-function copyProps (src, dst) {
-  for (var key in src) {
-    dst[key] = src[key]
-  }
-}
-if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
-  module.exports = buffer
-} else {
-  // Copy properties from require('buffer')
-  copyProps(buffer, exports)
-  exports.Buffer = SafeBuffer
-}
-
-function SafeBuffer (arg, encodingOrOffset, length) {
-  return Buffer(arg, encodingOrOffset, length)
-}
-
-// Copy static methods from Buffer
-copyProps(Buffer, SafeBuffer)
-
-SafeBuffer.from = function (arg, encodingOrOffset, length) {
-  if (typeof arg === 'number') {
-    throw new TypeError('Argument must not be a number')
-  }
-  return Buffer(arg, encodingOrOffset, length)
-}
-
-SafeBuffer.alloc = function (size, fill, encoding) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  var buf = Buffer(size)
-  if (fill !== undefined) {
-    if (typeof encoding === 'string') {
-      buf.fill(fill, encoding)
-    } else {
-      buf.fill(fill)
-    }
-  } else {
-    buf.fill(0)
-  }
-  return buf
-}
-
-SafeBuffer.allocUnsafe = function (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  return Buffer(size)
-}
-
-SafeBuffer.allocUnsafeSlow = function (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  return buffer.SlowBuffer(size)
-}
-
-},{"buffer":3}],22:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-'use strict';
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-/*</replacement>*/
-
-var isEncoding = Buffer.isEncoding || function (encoding) {
-  encoding = '' + encoding;
-  switch (encoding && encoding.toLowerCase()) {
-    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
-      return true;
-    default:
-      return false;
-  }
-};
-
-function _normalizeEncoding(enc) {
-  if (!enc) return 'utf8';
-  var retried;
-  while (true) {
-    switch (enc) {
-      case 'utf8':
-      case 'utf-8':
-        return 'utf8';
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return 'utf16le';
-      case 'latin1':
-      case 'binary':
-        return 'latin1';
-      case 'base64':
-      case 'ascii':
-      case 'hex':
-        return enc;
-      default:
-        if (retried) return; // undefined
-        enc = ('' + enc).toLowerCase();
-        retried = true;
-    }
-  }
-};
-
-// Do not cache `Buffer.isEncoding` when checking encoding names as some
-// modules monkey-patch it to support additional encodings
-function normalizeEncoding(enc) {
-  var nenc = _normalizeEncoding(enc);
-  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
-  return nenc || enc;
-}
-
-// StringDecoder provides an interface for efficiently splitting a series of
-// buffers into a series of JS strings without breaking apart multi-byte
-// characters.
-exports.StringDecoder = StringDecoder;
-function StringDecoder(encoding) {
-  this.encoding = normalizeEncoding(encoding);
-  var nb;
-  switch (this.encoding) {
-    case 'utf16le':
-      this.text = utf16Text;
-      this.end = utf16End;
-      nb = 4;
-      break;
-    case 'utf8':
-      this.fillLast = utf8FillLast;
-      nb = 4;
-      break;
-    case 'base64':
-      this.text = base64Text;
-      this.end = base64End;
-      nb = 3;
-      break;
-    default:
-      this.write = simpleWrite;
-      this.end = simpleEnd;
-      return;
-  }
-  this.lastNeed = 0;
-  this.lastTotal = 0;
-  this.lastChar = Buffer.allocUnsafe(nb);
-}
-
-StringDecoder.prototype.write = function (buf) {
-  if (buf.length === 0) return '';
-  var r;
-  var i;
-  if (this.lastNeed) {
-    r = this.fillLast(buf);
-    if (r === undefined) return '';
-    i = this.lastNeed;
-    this.lastNeed = 0;
-  } else {
-    i = 0;
-  }
-  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
-  return r || '';
-};
-
-StringDecoder.prototype.end = utf8End;
-
-// Returns only complete characters in a Buffer
-StringDecoder.prototype.text = utf8Text;
-
-// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
-StringDecoder.prototype.fillLast = function (buf) {
-  if (this.lastNeed <= buf.length) {
-    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
-    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
-  }
-  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
-  this.lastNeed -= buf.length;
-};
-
-// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
-// continuation byte. If an invalid byte is detected, -2 is returned.
-function utf8CheckByte(byte) {
-  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
-  return byte >> 6 === 0x02 ? -1 : -2;
-}
-
-// Checks at most 3 bytes at the end of a Buffer in order to detect an
-// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
-// needed to complete the UTF-8 character (if applicable) are returned.
-function utf8CheckIncomplete(self, buf, i) {
-  var j = buf.length - 1;
-  if (j < i) return 0;
-  var nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) self.lastNeed = nb - 1;
-    return nb;
-  }
-  if (--j < i || nb === -2) return 0;
-  nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) self.lastNeed = nb - 2;
-    return nb;
-  }
-  if (--j < i || nb === -2) return 0;
-  nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) {
-      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
-    }
-    return nb;
-  }
-  return 0;
-}
-
-// Validates as many continuation bytes for a multi-byte UTF-8 character as
-// needed or are available. If we see a non-continuation byte where we expect
-// one, we "replace" the validated continuation bytes we've seen so far with
-// a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding
-// behavior. The continuation byte check is included three times in the case
-// where all of the continuation bytes for a character exist in the same buffer.
-// It is also done this way as a slight performance increase instead of using a
-// loop.
-function utf8CheckExtraBytes(self, buf, p) {
-  if ((buf[0] & 0xC0) !== 0x80) {
-    self.lastNeed = 0;
-    return '\ufffd';
-  }
-  if (self.lastNeed > 1 && buf.length > 1) {
-    if ((buf[1] & 0xC0) !== 0x80) {
-      self.lastNeed = 1;
-      return '\ufffd';
-    }
-    if (self.lastNeed > 2 && buf.length > 2) {
-      if ((buf[2] & 0xC0) !== 0x80) {
-        self.lastNeed = 2;
-        return '\ufffd';
-      }
-    }
-  }
-}
-
-// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
-function utf8FillLast(buf) {
-  var p = this.lastTotal - this.lastNeed;
-  var r = utf8CheckExtraBytes(this, buf, p);
-  if (r !== undefined) return r;
-  if (this.lastNeed <= buf.length) {
-    buf.copy(this.lastChar, p, 0, this.lastNeed);
-    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
-  }
-  buf.copy(this.lastChar, p, 0, buf.length);
-  this.lastNeed -= buf.length;
-}
-
-// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
-// partial character, the character's bytes are buffered until the required
-// number of bytes are available.
-function utf8Text(buf, i) {
-  var total = utf8CheckIncomplete(this, buf, i);
-  if (!this.lastNeed) return buf.toString('utf8', i);
-  this.lastTotal = total;
-  var end = buf.length - (total - this.lastNeed);
-  buf.copy(this.lastChar, 0, end);
-  return buf.toString('utf8', i, end);
-}
-
-// For UTF-8, a replacement character is added when ending on a partial
-// character.
-function utf8End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) return r + '\ufffd';
-  return r;
-}
-
-// UTF-16LE typically needs two bytes per character, but even if we have an even
-// number of bytes available, we need to check if we end on a leading/high
-// surrogate. In that case, we need to wait for the next two bytes in order to
-// decode the last character properly.
-function utf16Text(buf, i) {
-  if ((buf.length - i) % 2 === 0) {
-    var r = buf.toString('utf16le', i);
-    if (r) {
-      var c = r.charCodeAt(r.length - 1);
-      if (c >= 0xD800 && c <= 0xDBFF) {
-        this.lastNeed = 2;
-        this.lastTotal = 4;
-        this.lastChar[0] = buf[buf.length - 2];
-        this.lastChar[1] = buf[buf.length - 1];
-        return r.slice(0, -1);
-      }
-    }
-    return r;
-  }
-  this.lastNeed = 1;
-  this.lastTotal = 2;
-  this.lastChar[0] = buf[buf.length - 1];
-  return buf.toString('utf16le', i, buf.length - 1);
-}
-
-// For UTF-16LE we do not explicitly append special replacement characters if we
-// end on a partial character, we simply let v8 handle that.
-function utf16End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) {
-    var end = this.lastTotal - this.lastNeed;
-    return r + this.lastChar.toString('utf16le', 0, end);
-  }
-  return r;
-}
-
-function base64Text(buf, i) {
-  var n = (buf.length - i) % 3;
-  if (n === 0) return buf.toString('base64', i);
-  this.lastNeed = 3 - n;
-  this.lastTotal = 3;
-  if (n === 1) {
-    this.lastChar[0] = buf[buf.length - 1];
-  } else {
-    this.lastChar[0] = buf[buf.length - 2];
-    this.lastChar[1] = buf[buf.length - 1];
-  }
-  return buf.toString('base64', i, buf.length - n);
-}
-
-function base64End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
-  return r;
-}
-
-// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
-function simpleWrite(buf) {
-  return buf.toString(this.encoding);
-}
-
-function simpleEnd(buf) {
-  return buf && buf.length ? this.write(buf) : '';
-}
-},{"safe-buffer":21}],23:[function(require,module,exports){
-module.exports = require('./readable').PassThrough
-
-},{"./readable":24}],24:[function(require,module,exports){
-exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = exports;
-exports.Readable = exports;
-exports.Writable = require('./lib/_stream_writable.js');
-exports.Duplex = require('./lib/_stream_duplex.js');
-exports.Transform = require('./lib/_stream_transform.js');
-exports.PassThrough = require('./lib/_stream_passthrough.js');
-
-},{"./lib/_stream_duplex.js":13,"./lib/_stream_passthrough.js":14,"./lib/_stream_readable.js":15,"./lib/_stream_transform.js":16,"./lib/_stream_writable.js":17}],25:[function(require,module,exports){
-module.exports = require('./readable').Transform
-
-},{"./readable":24}],26:[function(require,module,exports){
-module.exports = require('./lib/_stream_writable.js');
-
-},{"./lib/_stream_writable.js":17}],27:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-module.exports = Stream;
-
-var EE = require('events').EventEmitter;
-var inherits = require('inherits');
-
-inherits(Stream, EE);
-Stream.Readable = require('readable-stream/readable.js');
-Stream.Writable = require('readable-stream/writable.js');
-Stream.Duplex = require('readable-stream/duplex.js');
-Stream.Transform = require('readable-stream/transform.js');
-Stream.PassThrough = require('readable-stream/passthrough.js');
-
-// Backwards-compat with node 0.4.x
-Stream.Stream = Stream;
-
-
-
-// old-style streams.  Note that the pipe method (the only relevant
-// part of this class) is overridden in the Readable class.
-
-function Stream() {
-  EE.call(this);
-}
-
-Stream.prototype.pipe = function(dest, options) {
-  var source = this;
-
-  function ondata(chunk) {
-    if (dest.writable) {
-      if (false === dest.write(chunk) && source.pause) {
-        source.pause();
-      }
-    }
-  }
-
-  source.on('data', ondata);
-
-  function ondrain() {
-    if (source.readable && source.resume) {
-      source.resume();
-    }
-  }
-
-  dest.on('drain', ondrain);
-
-  // If the 'end' option is not supplied, dest.end() will be called when
-  // source gets the 'end' or 'close' events.  Only dest.end() once.
-  if (!dest._isStdio && (!options || options.end !== false)) {
-    source.on('end', onend);
-    source.on('close', onclose);
-  }
-
-  var didOnEnd = false;
-  function onend() {
-    if (didOnEnd) return;
-    didOnEnd = true;
-
-    dest.end();
-  }
-
-
-  function onclose() {
-    if (didOnEnd) return;
-    didOnEnd = true;
-
-    if (typeof dest.destroy === 'function') dest.destroy();
-  }
-
-  // don't leave dangling pipes when there are errors.
-  function onerror(er) {
-    cleanup();
-    if (EE.listenerCount(this, 'error') === 0) {
-      throw er; // Unhandled stream error in pipe.
-    }
-  }
-
-  source.on('error', onerror);
-  dest.on('error', onerror);
-
-  // remove all the event listeners that were added.
-  function cleanup() {
-    source.removeListener('data', ondata);
-    dest.removeListener('drain', ondrain);
-
-    source.removeListener('end', onend);
-    source.removeListener('close', onclose);
-
-    source.removeListener('error', onerror);
-    dest.removeListener('error', onerror);
-
-    source.removeListener('end', cleanup);
-    source.removeListener('close', cleanup);
-
-    dest.removeListener('close', cleanup);
-  }
-
-  source.on('end', cleanup);
-  source.on('close', cleanup);
-
-  dest.on('close', cleanup);
-
-  dest.emit('pipe', source);
-
-  // Allow for unix-like usage: A.pipe(B).pipe(C)
-  return dest;
-};
-
-},{"events":5,"inherits":7,"readable-stream/duplex.js":12,"readable-stream/passthrough.js":23,"readable-stream/readable.js":24,"readable-stream/transform.js":25,"readable-stream/writable.js":26}],28:[function(require,module,exports){
-(function (setImmediate,clearImmediate){
-var nextTick = require('process/browser.js').nextTick;
-var apply = Function.prototype.apply;
-var slice = Array.prototype.slice;
-var immediateIds = {};
-var nextImmediateId = 0;
-
-// DOM APIs, for completeness
-
-exports.setTimeout = function() {
-  return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
-};
-exports.setInterval = function() {
-  return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
-};
-exports.clearTimeout =
-exports.clearInterval = function(timeout) { timeout.close(); };
-
-function Timeout(id, clearFn) {
-  this._id = id;
-  this._clearFn = clearFn;
-}
-Timeout.prototype.unref = Timeout.prototype.ref = function() {};
-Timeout.prototype.close = function() {
-  this._clearFn.call(window, this._id);
-};
-
-// Does not start the time, just sets up the members needed.
-exports.enroll = function(item, msecs) {
-  clearTimeout(item._idleTimeoutId);
-  item._idleTimeout = msecs;
-};
-
-exports.unenroll = function(item) {
-  clearTimeout(item._idleTimeoutId);
-  item._idleTimeout = -1;
-};
-
-exports._unrefActive = exports.active = function(item) {
-  clearTimeout(item._idleTimeoutId);
-
-  var msecs = item._idleTimeout;
-  if (msecs >= 0) {
-    item._idleTimeoutId = setTimeout(function onTimeout() {
-      if (item._onTimeout)
-        item._onTimeout();
-    }, msecs);
-  }
-};
-
-// That's not how node.js implements it but the exposed api is the same.
-exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
-  var id = nextImmediateId++;
-  var args = arguments.length < 2 ? false : slice.call(arguments, 1);
-
-  immediateIds[id] = true;
-
-  nextTick(function onNextTick() {
-    if (immediateIds[id]) {
-      // fn.call() is faster so we optimize for the common use-case
-      // @see http://jsperf.com/call-apply-segu
-      if (args) {
-        fn.apply(null, args);
-      } else {
-        fn.call(null);
-      }
-      // Prevent ids from leaking
-      exports.clearImmediate(id);
-    }
-  });
-
-  return id;
-};
-
-exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) {
-  delete immediateIds[id];
-};
-}).call(this,require("timers").setImmediate,require("timers").clearImmediate)
-},{"process/browser.js":11,"timers":28}],29:[function(require,module,exports){
-(function (global){
-
-/**
- * Module exports.
- */
-
-module.exports = deprecate;
-
-/**
- * Mark that a method should not be used.
- * Returns a modified function which warns once by default.
- *
- * If `localStorage.noDeprecation = true` is set, then it is a no-op.
- *
- * If `localStorage.throwDeprecation = true` is set, then deprecated functions
- * will throw an Error when invoked.
- *
- * If `localStorage.traceDeprecation = true` is set, then deprecated functions
- * will invoke `console.trace()` instead of `console.error()`.
- *
- * @param {Function} fn - the function to deprecate
- * @param {String} msg - the string to print to the console when `fn` is invoked
- * @returns {Function} a new "deprecated" version of `fn`
- * @api public
- */
-
-function deprecate (fn, msg) {
-  if (config('noDeprecation')) {
-    return fn;
-  }
-
-  var warned = false;
-  function deprecated() {
-    if (!warned) {
-      if (config('throwDeprecation')) {
-        throw new Error(msg);
-      } else if (config('traceDeprecation')) {
-        console.trace(msg);
-      } else {
-        console.warn(msg);
-      }
-      warned = true;
-    }
-    return fn.apply(this, arguments);
-  }
-
-  return deprecated;
-}
-
-/**
- * Checks `localStorage` for boolean values for the given `name`.
- *
- * @param {String} name
- * @returns {Boolean}
- * @api private
- */
-
-function config (name) {
-  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
-  try {
-    if (!global.localStorage) return false;
-  } catch (_) {
-    return false;
-  }
-  var val = global.localStorage[name];
-  if (null == val) return false;
-  return String(val).toLowerCase() === 'true';
-}
-
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{}],30:[function(require,module,exports){
-const Writable = require('stream').Writable
-const ebml = require('ebml')
-const ebmlBlock = require('ebml-block')
-const readElement = require('./lib/read-element')
-
-// track elements we care about
-const TRACK_ELEMENTS = ['TrackNumber', 'TrackType', 'Language', 'CodecID', 'CodecPrivate']
-const SUBTITLE_TYPES = ['S_TEXT/UTF8', 'S_TEXT/SSA', 'S_TEXT/ASS']
-const ASS_KEYS = ['readOrder', 'layer', 'style', 'name', 'marginL', 'marginR', 'marginV', 'effect', 'text']
-
-class MatroskaSubtitles extends Writable {
-  constructor (prevInstance) {
-    super()
-
-    let currentTrack = null
-    let currentSubtitleBlock = null
-    let currentClusterTimecode = null
-
-    this.decoder = new ebml.Decoder()
-
-    if (prevInstance instanceof MatroskaSubtitles) {
-      prevInstance.end()
-      // copy previous metadata
-      this.subtitleTracks = prevInstance.subtitleTracks
-      this.timecodeScale = prevInstance.timecodeScale
-      this.decoder.on('data', _onClusterData)
-    } else {
-      this.subtitleTracks = new Map()
-      this.timecodeScale = 1
-      this.decoder.on('data', _onMetaData)
-    }
-
-    const self = this
-
-    function _onMetaData (chunk) {
-      // Segment Information
-      if (chunk[1].name === 'TimecodeScale') {
-        self.timecodeScale = readElement(chunk[1]) / 1000000
-      }
-
-      // Tracks
-      if (chunk[0] === 'start' && chunk[1].name === 'TrackEntry') {
-        currentTrack = {}
-      }
-
-      if (currentTrack && chunk[0] === 'tag') {
-        // save info about track currently being scanned
-        if (TRACK_ELEMENTS.includes(chunk[1].name)) {
-          currentTrack[chunk[1].name] = readElement(chunk[1])
-        }
-      }
-
-      if (chunk[0] === 'end' && chunk[1].name === 'TrackEntry') {
-        if (currentTrack.TrackType === 0x11) { // Subtitle Track
-          if (SUBTITLE_TYPES.includes(currentTrack.CodecID)) {
-            const track = {
-              number: currentTrack.TrackNumber,
-              language: currentTrack.Language,
-              type: currentTrack.CodecID.substring(7).toLowerCase()
-            }
-
-            if (currentTrack.CodecPrivate) {
-              // only SSA/ASS
-              track.header = currentTrack.CodecPrivate.toString('utf8')
-            }
-
-            self.subtitleTracks.set(currentTrack.TrackNumber, track)
-          }
-        }
-        currentTrack = null
-      }
-
-      if (chunk[0] === 'end' && chunk[1].name === 'Tracks') {
-        self.decoder.removeListener('data', _onMetaData)
-
-        if (self.subtitleTracks.size <= 0) return self.end()
-
-        self.decoder.on('data', _onClusterData)
-        self.emit('tracks', Array.from(self.subtitleTracks.values()))
-      }
-    }
-
-    function _onClusterData (chunk) {
-      // TODO: assuming this is a Cluster `Timecode`
-      if (chunk[1].name === 'Timecode') {
-        currentClusterTimecode = readElement(chunk[1])
-      }
-
-      if (chunk[1].name === 'Block') {
-        const block = ebmlBlock(chunk[1].data)
-
-        if (self.subtitleTracks.has(block.trackNumber)) {
-          const type = self.subtitleTracks.get(block.trackNumber).type
-
-          let subtitle = {
-            text: block.frames[0].toString('utf8'),
-            time: (block.timecode + currentClusterTimecode) * self.timecodeScale
-          }
-
-          if (type === 'ass' || type === 'ssa') {
-            // extract SSA/ASS keys
-            const values = subtitle.text.split(',')
-            // ignore read-order, and skip layer if ssa
-            let i = type === 'ssa' ? 2 : 1
-            for (; i < 9; i++) {
-              subtitle[ASS_KEYS[i]] = values[i]
-            }
-            // re-append extra text that might have been split
-            for (i = 9; i < values.length; i++) {
-              subtitle.text += ',' + values[i]
-            }
-          }
-
-          currentSubtitleBlock = [subtitle, block.trackNumber]
-        }
-      }
-
-      // TODO: assuming `BlockDuration` exists and always comes after `Block`
-      if (currentSubtitleBlock && chunk[1].name === 'BlockDuration') {
-        currentSubtitleBlock[0].duration = readElement(chunk[1]) * self.timecodeScale
-
-        self.emit('subtitle', ...currentSubtitleBlock)
-
-        currentSubtitleBlock = null
-      }
-    }
-  }
-
-  _write (chunk, _, callback) {
-    this.decoder.write(chunk)
-    callback(null)
-  }
-}
-
-module.exports = MatroskaSubtitles
-
-},{"./lib/read-element":31,"ebml":37,"ebml-block":34,"stream":27}],31:[function(require,module,exports){
-const millennium = Date.UTC(2001, 0)
-
-module.exports = function (tag) {
-  switch (tag.type) {
-    case 's': return tag.data.toString('ascii')
-    case '8': return tag.data.toString('utf8')
-    case 'u': return tag.data.readUIntBE(0, tag.dataSize)
-    case 'i': return tag.data.readIntBE(0, tag.dataSize)
-    case 'f': return tag.dataSize === 4
-      ? tag.data.readFloatBE()
-      : tag.data.readDoubleBE()
-    case 'd': return new Date(millennium + tag.data.readIntBE(0, 8) / 1000000)
-    case 'b': case 'm': default: return tag.data
-  }
-}
-},{}],32:[function(require,module,exports){
-(function (process){
-/**
- * This is the web browser implementation of `debug()`.
- *
- * Expose `debug()` as the module.
- */
-
-exports = module.exports = require('./debug');
-exports.log = log;
-exports.formatArgs = formatArgs;
-exports.save = save;
-exports.load = load;
-exports.useColors = useColors;
-exports.storage = 'undefined' != typeof chrome
-               && 'undefined' != typeof chrome.storage
-                  ? chrome.storage.local
-                  : localstorage();
-
-/**
- * Colors.
- */
-
-exports.colors = [
-  '#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC',
-  '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF',
-  '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC',
-  '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF',
-  '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC',
-  '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033',
-  '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366',
-  '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933',
-  '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC',
-  '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF',
-  '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'
-];
-
-/**
- * Currently only WebKit-based Web Inspectors, Firefox >= v31,
- * and the Firebug extension (any Firefox version) are known
- * to support "%c" CSS customizations.
- *
- * TODO: add a `localStorage` variable to explicitly enable/disable colors
- */
-
-function useColors() {
-  // NB: In an Electron preload script, document will be defined but not fully
-  // initialized. Since we know we're in Chrome, we'll just detect this case
-  // explicitly
-  if (typeof window !== 'undefined' && window.process && window.process.type === 'renderer') {
-    return true;
-  }
-
-  // Internet Explorer and Edge do not support colors.
-  if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
-    return false;
-  }
-
-  // is webkit? http://stackoverflow.com/a/16459606/376773
-  // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
-  return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
-    // is firebug? http://stackoverflow.com/a/398120/376773
-    (typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
-    // is firefox >= v31?
-    // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
-    (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
-    // double check webkit in userAgent just in case we are in a worker
-    (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
-}
-
-/**
- * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
- */
-
-exports.formatters.j = function(v) {
-  try {
-    return JSON.stringify(v);
-  } catch (err) {
-    return '[UnexpectedJSONParseError]: ' + err.message;
-  }
-};
-
-
-/**
- * Colorize log arguments if enabled.
- *
- * @api public
- */
-
-function formatArgs(args) {
-  var useColors = this.useColors;
-
-  args[0] = (useColors ? '%c' : '')
-    + this.namespace
-    + (useColors ? ' %c' : ' ')
-    + args[0]
-    + (useColors ? '%c ' : ' ')
-    + '+' + exports.humanize(this.diff);
-
-  if (!useColors) return;
-
-  var c = 'color: ' + this.color;
-  args.splice(1, 0, c, 'color: inherit')
-
-  // the final "%c" is somewhat tricky, because there could be other
-  // arguments passed either before or after the %c, so we need to
-  // figure out the correct index to insert the CSS into
-  var index = 0;
-  var lastC = 0;
-  args[0].replace(/%[a-zA-Z%]/g, function(match) {
-    if ('%%' === match) return;
-    index++;
-    if ('%c' === match) {
-      // we only are interested in the *last* %c
-      // (the user may have provided their own)
-      lastC = index;
-    }
-  });
-
-  args.splice(lastC, 0, c);
-}
-
-/**
- * Invokes `console.log()` when available.
- * No-op when `console.log` is not a "function".
- *
- * @api public
- */
-
-function log() {
-  // this hackery is required for IE8/9, where
-  // the `console.log` function doesn't have 'apply'
-  return 'object' === typeof console
-    && console.log
-    && Function.prototype.apply.call(console.log, console, arguments);
-}
-
-/**
- * Save `namespaces`.
- *
- * @param {String} namespaces
- * @api private
- */
-
-function save(namespaces) {
-  try {
-    if (null == namespaces) {
-      exports.storage.removeItem('debug');
-    } else {
-      exports.storage.debug = namespaces;
-    }
-  } catch(e) {}
-}
-
-/**
- * Load `namespaces`.
- *
- * @return {String} returns the previously persisted debug modes
- * @api private
- */
-
-function load() {
-  var r;
-  try {
-    r = exports.storage.debug;
-  } catch(e) {}
-
-  // If debug isn't set in LS, and we're in Electron, try to load $DEBUG
-  if (!r && typeof process !== 'undefined' && 'env' in process) {
-    r = process.env.DEBUG;
-  }
-
-  return r;
-}
-
-/**
- * Enable namespaces listed in `localStorage.debug` initially.
- */
-
-exports.enable(load());
-
-/**
- * Localstorage attempts to return the localstorage.
- *
- * This is necessary because safari throws
- * when a user disables cookies/localstorage
- * and you attempt to access it.
- *
- * @return {LocalStorage}
- * @api private
- */
-
-function localstorage() {
-  try {
-    return window.localStorage;
-  } catch (e) {}
-}
-
-}).call(this,require('_process'))
-},{"./debug":33,"_process":11}],33:[function(require,module,exports){
-
-/**
- * This is the common logic for both the Node.js and web browser
- * implementations of `debug()`.
- *
- * Expose `debug()` as the module.
- */
-
-exports = module.exports = createDebug.debug = createDebug['default'] = createDebug;
-exports.coerce = coerce;
-exports.disable = disable;
-exports.enable = enable;
-exports.enabled = enabled;
-exports.humanize = require('ms');
-
-/**
- * Active `debug` instances.
- */
-exports.instances = [];
-
-/**
- * The currently active debug mode names, and names to skip.
- */
-
-exports.names = [];
-exports.skips = [];
-
-/**
- * Map of special "%n" handling functions, for the debug "format" argument.
- *
- * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
- */
-
-exports.formatters = {};
-
-/**
- * Select a color.
- * @param {String} namespace
- * @return {Number}
- * @api private
- */
-
-function selectColor(namespace) {
-  var hash = 0, i;
-
-  for (i in namespace) {
-    hash  = ((hash << 5) - hash) + namespace.charCodeAt(i);
-    hash |= 0; // Convert to 32bit integer
-  }
-
-  return exports.colors[Math.abs(hash) % exports.colors.length];
-}
-
-/**
- * Create a debugger with the given `namespace`.
- *
- * @param {String} namespace
- * @return {Function}
- * @api public
- */
-
-function createDebug(namespace) {
-
-  var prevTime;
-
-  function debug() {
-    // disabled?
-    if (!debug.enabled) return;
-
-    var self = debug;
-
-    // set `diff` timestamp
-    var curr = +new Date();
-    var ms = curr - (prevTime || curr);
-    self.diff = ms;
-    self.prev = prevTime;
-    self.curr = curr;
-    prevTime = curr;
-
-    // turn the `arguments` into a proper Array
-    var args = new Array(arguments.length);
-    for (var i = 0; i < args.length; i++) {
-      args[i] = arguments[i];
-    }
-
-    args[0] = exports.coerce(args[0]);
-
-    if ('string' !== typeof args[0]) {
-      // anything else let's inspect with %O
-      args.unshift('%O');
-    }
-
-    // apply any `formatters` transformations
-    var index = 0;
-    args[0] = args[0].replace(/%([a-zA-Z%])/g, function(match, format) {
-      // if we encounter an escaped % then don't increase the array index
-      if (match === '%%') return match;
-      index++;
-      var formatter = exports.formatters[format];
-      if ('function' === typeof formatter) {
-        var val = args[index];
-        match = formatter.call(self, val);
-
-        // now we need to remove `args[index]` since it's inlined in the `format`
-        args.splice(index, 1);
-        index--;
-      }
-      return match;
-    });
-
-    // apply env-specific formatting (colors, etc.)
-    exports.formatArgs.call(self, args);
-
-    var logFn = debug.log || exports.log || console.log.bind(console);
-    logFn.apply(self, args);
-  }
-
-  debug.namespace = namespace;
-  debug.enabled = exports.enabled(namespace);
-  debug.useColors = exports.useColors();
-  debug.color = selectColor(namespace);
-  debug.destroy = destroy;
-
-  // env-specific initialization logic for debug instances
-  if ('function' === typeof exports.init) {
-    exports.init(debug);
-  }
-
-  exports.instances.push(debug);
-
-  return debug;
-}
-
-function destroy () {
-  var index = exports.instances.indexOf(this);
-  if (index !== -1) {
-    exports.instances.splice(index, 1);
-    return true;
-  } else {
-    return false;
-  }
-}
-
-/**
- * Enables a debug mode by namespaces. This can include modes
- * separated by a colon and wildcards.
- *
- * @param {String} namespaces
- * @api public
- */
-
-function enable(namespaces) {
-  exports.save(namespaces);
-
-  exports.names = [];
-  exports.skips = [];
-
-  var i;
-  var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
-  var len = split.length;
-
-  for (i = 0; i < len; i++) {
-    if (!split[i]) continue; // ignore empty strings
-    namespaces = split[i].replace(/\*/g, '.*?');
-    if (namespaces[0] === '-') {
-      exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
-    } else {
-      exports.names.push(new RegExp('^' + namespaces + '$'));
-    }
-  }
-
-  for (i = 0; i < exports.instances.length; i++) {
-    var instance = exports.instances[i];
-    instance.enabled = exports.enabled(instance.namespace);
-  }
-}
-
-/**
- * Disable debug output.
- *
- * @api public
- */
-
-function disable() {
-  exports.enable('');
-}
-
-/**
- * Returns true if the given mode name is enabled, false otherwise.
- *
- * @param {String} name
- * @return {Boolean}
- * @api public
- */
-
-function enabled(name) {
-  if (name[name.length - 1] === '*') {
-    return true;
-  }
-  var i, len;
-  for (i = 0, len = exports.skips.length; i < len; i++) {
-    if (exports.skips[i].test(name)) {
-      return false;
-    }
-  }
-  for (i = 0, len = exports.names.length; i < len; i++) {
-    if (exports.names[i].test(name)) {
-      return true;
-    }
-  }
-  return false;
-}
-
-/**
- * Coerce `val`.
- *
- * @param {Mixed} val
- * @return {Mixed}
- * @api private
- */
-
-function coerce(val) {
-  if (val instanceof Error) return val.stack || val.message;
-  return val;
-}
-
-},{"ms":38}],34:[function(require,module,exports){
-var BufferReader = require('./lib/buffer-reader')
-
-var XIPH_LACING = 1
-var EBML_LACING = 3
-var FIXED_SIZE_LACING = 2
-
-module.exports = function (buffer) {
-  var block = {}
-  var reader = new BufferReader(buffer)
-
-  block.trackNumber = reader.nextUIntV()
-  block.timecode = reader.nextInt16BE()
-
-  var flags = reader.nextUInt8()
-
-  block.invisible = !!(flags & 0x8)
-
-  // only valid for SimpleBlock
-  block.keyframe = !!(flags & 0x80)
-  block.discardable = !!(flags & 0x1)
-
-  var lacing = (flags & 0x6) >> 1
-
-  block.frames = readLacedData(reader, lacing)
-
-  return block
-}
-
-function readLacedData (reader, lacing) {
-  if (!lacing) return [reader.nextBuffer()]
-
-  var i, frameSize
-  var frames = []
-  var framesNum = reader.nextUInt8() + 1 // number of frames
-
-  if (lacing === FIXED_SIZE_LACING) {
-    // remaining data should be divisible by the number of frames
-    if (reader.length % framesNum !== 0) throw new Error('Fixed-Size Lacing Error')
-
-    frameSize = reader.length / framesNum
-    for (i = 0; i < framesNum; i++) {
-      frames.push(reader.nextBuffer(frameSize))
-    }
-    return frames
-  }
-
-  var frameSizes = []
-
-  if (lacing === XIPH_LACING) {
-    for (i = 0; i < framesNum - 1; i++) {
-      var val
-      frameSize = 0
-      do {
-        val = reader.nextUInt8()
-        frameSize += val
-      } while (val === 0xff)
-      frameSizes.push(frameSize)
-    }
-  } else if (lacing === EBML_LACING) {
-    // first frame
-    frameSize = reader.nextUIntV()
-    frameSizes.push(frameSize)
-
-    // middle frames
-    for (i = 1; i < framesNum - 1; i++) {
-      frameSize += reader.nextIntV()
-      frameSizes.push(frameSize)
-    }
-  }
-
-  for (i = 0; i < framesNum - 1; i++) {
-    frames.push(reader.nextBuffer(frameSizes[i]))
-  }
-
-  // last frame (remaining buffer)
-  frames.push(reader.nextBuffer())
-
-  return frames
-}
-
-},{"./lib/buffer-reader":35}],35:[function(require,module,exports){
-var vint = require('./vint')
-
-function BufferReader (buffer) {
-  this.buffer = buffer
-  this.offset = 0
-}
-
-// a super limited subset of the node buffer API
-BufferReader.prototype.nextInt16BE = function () {
-  var value = this.buffer.readInt16BE(this.offset)
-  this.offset += 2
-  return value
-}
-
-BufferReader.prototype.nextUInt8 = function () {
-  var value = this.buffer.readUInt8(this.offset)
-  this.offset += 1
-  return value
-}
-
-// EBML variable sized integers
-BufferReader.prototype.nextUIntV = function () {
-  var v = vint(this.buffer, this.offset)
-  this.offset += v.length
-  return v.value
-}
-
-BufferReader.prototype.nextIntV = function () {
-  var v = vint(this.buffer, this.offset, true)
-  this.offset += v.length
-  return v.value
-}
-
-// buffer slice
-BufferReader.prototype.nextBuffer = function (length) {
-  var buffer = length
-    ? this.buffer.slice(this.offset, this.offset + length)
-    : this.buffer.slice(this.offset)
-  this.offset += length || this.length
-  return buffer
-}
-
-// remaining bytes to read
-Object.defineProperty(BufferReader.prototype, 'length', {
-  get: function () { return this.buffer.length - this.offset }
-})
-
-module.exports = BufferReader
-
-},{"./vint":36}],36:[function(require,module,exports){
-// https://github.com/themasch/node-ebml/blob/master/lib/ebml/tools.js
-module.exports = function (buffer, start, signed) {
-  start = start || 0
-  for (var length = 1; length <= 8; length++) {
-    if (buffer[start] >= Math.pow(2, 8 - length)) {
-      break
-    }
-  }
-  if (length > 8) {
-    throw new Error('Unrepresentable length: ' + length + ' ' +
-      buffer.toString('hex', start, start + length))
-  }
-  if (start + length > buffer.length) {
-    return null
-  }
-  var i
-  var value = buffer[start] & (1 << (8 - length)) - 1
-  for (i = 1; i < length; i++) {
-    if (i === 7) {
-      if (value >= Math.pow(2, 53 - 8) && buffer[start + 7] > 0) {
-        return {
-          length: length,
-          value: -1
-        }
-      }
-    }
-    value *= Math.pow(2, 8)
-    value += buffer[start + i]
-  }
-  if (signed) {
-    value -= Math.pow(2, length * 7 - 1) - 1
-  }
-  return {
-    length: length,
-    value: value
-  }
-}
-
-},{}],37:[function(require,module,exports){
-(function (global,Buffer){
-var EBML = (function (exports) {
-            'use strict';
-
-            var global$1 = (typeof global !== "undefined" ? global :
-                        typeof self !== "undefined" ? self :
-                        typeof window !== "undefined" ? window : {});
-
-            var lookup = [];
-            var revLookup = [];
-            var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array;
-            var inited = false;
-            function init () {
-              inited = true;
-              var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
-              for (var i = 0, len = code.length; i < len; ++i) {
-                lookup[i] = code[i];
-                revLookup[code.charCodeAt(i)] = i;
-              }
-
-              revLookup['-'.charCodeAt(0)] = 62;
-              revLookup['_'.charCodeAt(0)] = 63;
-            }
-
-            function toByteArray (b64) {
-              if (!inited) {
-                init();
-              }
-              var i, j, l, tmp, placeHolders, arr;
-              var len = b64.length;
-
-              if (len % 4 > 0) {
-                throw new Error('Invalid string. Length must be a multiple of 4')
-              }
-
-              // the number of equal signs (place holders)
-              // if there are two placeholders, than the two characters before it
-              // represent one byte
-              // if there is only one, then the three characters before it represent 2 bytes
-              // this is just a cheap hack to not do indexOf twice
-              placeHolders = b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0;
-
-              // base64 is 4/3 + up to two characters of the original data
-              arr = new Arr(len * 3 / 4 - placeHolders);
-
-              // if there are placeholders, only get up to the last complete 4 chars
-              l = placeHolders > 0 ? len - 4 : len;
-
-              var L = 0;
-
-              for (i = 0, j = 0; i < l; i += 4, j += 3) {
-                tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)];
-                arr[L++] = (tmp >> 16) & 0xFF;
-                arr[L++] = (tmp >> 8) & 0xFF;
-                arr[L++] = tmp & 0xFF;
-              }
-
-              if (placeHolders === 2) {
-                tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4);
-                arr[L++] = tmp & 0xFF;
-              } else if (placeHolders === 1) {
-                tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2);
-                arr[L++] = (tmp >> 8) & 0xFF;
-                arr[L++] = tmp & 0xFF;
-              }
-
-              return arr
-            }
-
-            function tripletToBase64 (num) {
-              return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
-            }
-
-            function encodeChunk (uint8, start, end) {
-              var tmp;
-              var output = [];
-              for (var i = start; i < end; i += 3) {
-                tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]);
-                output.push(tripletToBase64(tmp));
-              }
-              return output.join('')
-            }
-
-            function fromByteArray (uint8) {
-              if (!inited) {
-                init();
-              }
-              var tmp;
-              var len = uint8.length;
-              var extraBytes = len % 3; // if we have 1 byte left, pad 2 bytes
-              var output = '';
-              var parts = [];
-              var maxChunkLength = 16383; // must be multiple of 3
-
-              // go through the array every three bytes, we'll deal with trailing stuff later
-              for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
-                parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)));
-              }
-
-              // pad the end with zeros, but make sure to not forget the extra bytes
-              if (extraBytes === 1) {
-                tmp = uint8[len - 1];
-                output += lookup[tmp >> 2];
-                output += lookup[(tmp << 4) & 0x3F];
-                output += '==';
-              } else if (extraBytes === 2) {
-                tmp = (uint8[len - 2] << 8) + (uint8[len - 1]);
-                output += lookup[tmp >> 10];
-                output += lookup[(tmp >> 4) & 0x3F];
-                output += lookup[(tmp << 2) & 0x3F];
-                output += '=';
-              }
-
-              parts.push(output);
-
-              return parts.join('')
-            }
-
-            function read (buffer, offset, isLE, mLen, nBytes) {
-              var e, m;
-              var eLen = nBytes * 8 - mLen - 1;
-              var eMax = (1 << eLen) - 1;
-              var eBias = eMax >> 1;
-              var nBits = -7;
-              var i = isLE ? (nBytes - 1) : 0;
-              var d = isLE ? -1 : 1;
-              var s = buffer[offset + i];
-
-              i += d;
-
-              e = s & ((1 << (-nBits)) - 1);
-              s >>= (-nBits);
-              nBits += eLen;
-              for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
-
-              m = e & ((1 << (-nBits)) - 1);
-              e >>= (-nBits);
-              nBits += mLen;
-              for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
-
-              if (e === 0) {
-                e = 1 - eBias;
-              } else if (e === eMax) {
-                return m ? NaN : ((s ? -1 : 1) * Infinity)
-              } else {
-                m = m + Math.pow(2, mLen);
-                e = e - eBias;
-              }
-              return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-            }
-
-            function write (buffer, value, offset, isLE, mLen, nBytes) {
-              var e, m, c;
-              var eLen = nBytes * 8 - mLen - 1;
-              var eMax = (1 << eLen) - 1;
-              var eBias = eMax >> 1;
-              var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0);
-              var i = isLE ? 0 : (nBytes - 1);
-              var d = isLE ? 1 : -1;
-              var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;
-
-              value = Math.abs(value);
-
-              if (isNaN(value) || value === Infinity) {
-                m = isNaN(value) ? 1 : 0;
-                e = eMax;
-              } else {
-                e = Math.floor(Math.log(value) / Math.LN2);
-                if (value * (c = Math.pow(2, -e)) < 1) {
-                  e--;
-                  c *= 2;
-                }
-                if (e + eBias >= 1) {
-                  value += rt / c;
-                } else {
-                  value += rt * Math.pow(2, 1 - eBias);
-                }
-                if (value * c >= 2) {
-                  e++;
-                  c /= 2;
-                }
-
-                if (e + eBias >= eMax) {
-                  m = 0;
-                  e = eMax;
-                } else if (e + eBias >= 1) {
-                  m = (value * c - 1) * Math.pow(2, mLen);
-                  e = e + eBias;
-                } else {
-                  m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
-                  e = 0;
-                }
-              }
-
-              for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
-
-              e = (e << mLen) | m;
-              eLen += mLen;
-              for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
-
-              buffer[offset + i - d] |= s * 128;
-            }
-
-            var toString = {}.toString;
-
-            var isArray = Array.isArray || function (arr) {
-              return toString.call(arr) == '[object Array]';
-            };
-
-            var INSPECT_MAX_BYTES = 50;
-
-            /**
-             * If `Buffer.TYPED_ARRAY_SUPPORT`:
-             *   === true    Use Uint8Array implementation (fastest)
-             *   === false   Use Object implementation (most compatible, even IE6)
-             *
-             * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
-             * Opera 11.6+, iOS 4.2+.
-             *
-             * Due to various browser bugs, sometimes the Object implementation will be used even
-             * when the browser supports typed arrays.
-             *
-             * Note:
-             *
-             *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,
-             *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.
-             *
-             *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.
-             *
-             *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of
-             *     incorrect length in some situations.
-
-             * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they
-             * get the Object implementation, which is slower but behaves correctly.
-             */
-            Buffer.TYPED_ARRAY_SUPPORT = global$1.TYPED_ARRAY_SUPPORT !== undefined
-              ? global$1.TYPED_ARRAY_SUPPORT
-              : true;
-
-            function kMaxLength () {
-              return Buffer.TYPED_ARRAY_SUPPORT
-                ? 0x7fffffff
-                : 0x3fffffff
-            }
-
-            function createBuffer (that, length) {
-              if (kMaxLength() < length) {
-                throw new RangeError('Invalid typed array length')
-              }
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                // Return an augmented `Uint8Array` instance, for best performance
-                that = new Uint8Array(length);
-                that.__proto__ = Buffer.prototype;
-              } else {
-                // Fallback: Return an object instance of the Buffer class
-                if (that === null) {
-                  that = new Buffer(length);
-                }
-                that.length = length;
-              }
-
-              return that
-            }
-
-            /**
-             * The Buffer constructor returns instances of `Uint8Array` that have their
-             * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
-             * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
-             * and the `Uint8Array` methods. Square bracket notation works as expected -- it
-             * returns a single octet.
-             *
-             * The `Uint8Array` prototype remains unmodified.
-             */
-
-            function Buffer (arg, encodingOrOffset, length) {
-              if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {
-                return new Buffer(arg, encodingOrOffset, length)
-              }
-
-              // Common case.
-              if (typeof arg === 'number') {
-                if (typeof encodingOrOffset === 'string') {
-                  throw new Error(
-                    'If encoding is specified then the first argument must be a string'
-                  )
-                }
-                return allocUnsafe(this, arg)
-              }
-              return from(this, arg, encodingOrOffset, length)
-            }
-
-            Buffer.poolSize = 8192; // not used by this implementation
-
-            // TODO: Legacy, not needed anymore. Remove in next major version.
-            Buffer._augment = function (arr) {
-              arr.__proto__ = Buffer.prototype;
-              return arr
-            };
-
-            function from (that, value, encodingOrOffset, length) {
-              if (typeof value === 'number') {
-                throw new TypeError('"value" argument must not be a number')
-              }
-
-              if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {
-                return fromArrayBuffer(that, value, encodingOrOffset, length)
-              }
-
-              if (typeof value === 'string') {
-                return fromString(that, value, encodingOrOffset)
-              }
-
-              return fromObject(that, value)
-            }
-
-            /**
-             * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
-             * if value is a number.
-             * Buffer.from(str[, encoding])
-             * Buffer.from(array)
-             * Buffer.from(buffer)
-             * Buffer.from(arrayBuffer[, byteOffset[, length]])
-             **/
-            Buffer.from = function (value, encodingOrOffset, length) {
-              return from(null, value, encodingOrOffset, length)
-            };
-
-            if (Buffer.TYPED_ARRAY_SUPPORT) {
-              Buffer.prototype.__proto__ = Uint8Array.prototype;
-              Buffer.__proto__ = Uint8Array;
-            }
-
-            function assertSize (size) {
-              if (typeof size !== 'number') {
-                throw new TypeError('"size" argument must be a number')
-              } else if (size < 0) {
-                throw new RangeError('"size" argument must not be negative')
-              }
-            }
-
-            function alloc (that, size, fill, encoding) {
-              assertSize(size);
-              if (size <= 0) {
-                return createBuffer(that, size)
-              }
-              if (fill !== undefined) {
-                // Only pay attention to encoding if it's a string. This
-                // prevents accidentally sending in a number that would
-                // be interpretted as a start offset.
-                return typeof encoding === 'string'
-                  ? createBuffer(that, size).fill(fill, encoding)
-                  : createBuffer(that, size).fill(fill)
-              }
-              return createBuffer(that, size)
-            }
-
-            /**
-             * Creates a new filled Buffer instance.
-             * alloc(size[, fill[, encoding]])
-             **/
-            Buffer.alloc = function (size, fill, encoding) {
-              return alloc(null, size, fill, encoding)
-            };
-
-            function allocUnsafe (that, size) {
-              assertSize(size);
-              that = createBuffer(that, size < 0 ? 0 : checked(size) | 0);
-              if (!Buffer.TYPED_ARRAY_SUPPORT) {
-                for (var i = 0; i < size; ++i) {
-                  that[i] = 0;
-                }
-              }
-              return that
-            }
-
-            /**
-             * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
-             * */
-            Buffer.allocUnsafe = function (size) {
-              return allocUnsafe(null, size)
-            };
-            /**
-             * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
-             */
-            Buffer.allocUnsafeSlow = function (size) {
-              return allocUnsafe(null, size)
-            };
-
-            function fromString (that, string, encoding) {
-              if (typeof encoding !== 'string' || encoding === '') {
-                encoding = 'utf8';
-              }
-
-              if (!Buffer.isEncoding(encoding)) {
-                throw new TypeError('"encoding" must be a valid string encoding')
-              }
-
-              var length = byteLength(string, encoding) | 0;
-              that = createBuffer(that, length);
-
-              var actual = that.write(string, encoding);
-
-              if (actual !== length) {
-                // Writing a hex string, for example, that contains invalid characters will
-                // cause everything after the first invalid character to be ignored. (e.g.
-                // 'abxxcd' will be treated as 'ab')
-                that = that.slice(0, actual);
-              }
-
-              return that
-            }
-
-            function fromArrayLike (that, array) {
-              var length = array.length < 0 ? 0 : checked(array.length) | 0;
-              that = createBuffer(that, length);
-              for (var i = 0; i < length; i += 1) {
-                that[i] = array[i] & 255;
-              }
-              return that
-            }
-
-            function fromArrayBuffer (that, array, byteOffset, length) {
-              array.byteLength; // this throws if `array` is not a valid ArrayBuffer
-
-              if (byteOffset < 0 || array.byteLength < byteOffset) {
-                throw new RangeError('\'offset\' is out of bounds')
-              }
-
-              if (array.byteLength < byteOffset + (length || 0)) {
-                throw new RangeError('\'length\' is out of bounds')
-              }
-
-              if (byteOffset === undefined && length === undefined) {
-                array = new Uint8Array(array);
-              } else if (length === undefined) {
-                array = new Uint8Array(array, byteOffset);
-              } else {
-                array = new Uint8Array(array, byteOffset, length);
-              }
-
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                // Return an augmented `Uint8Array` instance, for best performance
-                that = array;
-                that.__proto__ = Buffer.prototype;
-              } else {
-                // Fallback: Return an object instance of the Buffer class
-                that = fromArrayLike(that, array);
-              }
-              return that
-            }
-
-            function fromObject (that, obj) {
-              if (internalIsBuffer(obj)) {
-                var len = checked(obj.length) | 0;
-                that = createBuffer(that, len);
-
-                if (that.length === 0) {
-                  return that
-                }
-
-                obj.copy(that, 0, 0, len);
-                return that
-              }
-
-              if (obj) {
-                if ((typeof ArrayBuffer !== 'undefined' &&
-                    obj.buffer instanceof ArrayBuffer) || 'length' in obj) {
-                  if (typeof obj.length !== 'number' || isnan(obj.length)) {
-                    return createBuffer(that, 0)
-                  }
-                  return fromArrayLike(that, obj)
-                }
-
-                if (obj.type === 'Buffer' && isArray(obj.data)) {
-                  return fromArrayLike(that, obj.data)
-                }
-              }
-
-              throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
-            }
-
-            function checked (length) {
-              // Note: cannot use `length < kMaxLength()` here because that fails when
-              // length is NaN (which is otherwise coerced to zero.)
-              if (length >= kMaxLength()) {
-                throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
-                                     'size: 0x' + kMaxLength().toString(16) + ' bytes')
-              }
-              return length | 0
-            }
-            Buffer.isBuffer = isBuffer;
-            function internalIsBuffer (b) {
-              return !!(b != null && b._isBuffer)
-            }
-
-            Buffer.compare = function compare (a, b) {
-              if (!internalIsBuffer(a) || !internalIsBuffer(b)) {
-                throw new TypeError('Arguments must be Buffers')
-              }
-
-              if (a === b) return 0
-
-              var x = a.length;
-              var y = b.length;
-
-              for (var i = 0, len = Math.min(x, y); i < len; ++i) {
-                if (a[i] !== b[i]) {
-                  x = a[i];
-                  y = b[i];
-                  break
-                }
-              }
-
-              if (x < y) return -1
-              if (y < x) return 1
-              return 0
-            };
-
-            Buffer.isEncoding = function isEncoding (encoding) {
-              switch (String(encoding).toLowerCase()) {
-                case 'hex':
-                case 'utf8':
-                case 'utf-8':
-                case 'ascii':
-                case 'latin1':
-                case 'binary':
-                case 'base64':
-                case 'ucs2':
-                case 'ucs-2':
-                case 'utf16le':
-                case 'utf-16le':
-                  return true
-                default:
-                  return false
-              }
-            };
-
-            Buffer.concat = function concat (list, length) {
-              if (!isArray(list)) {
-                throw new TypeError('"list" argument must be an Array of Buffers')
-              }
-
-              if (list.length === 0) {
-                return Buffer.alloc(0)
-              }
-
-              var i;
-              if (length === undefined) {
-                length = 0;
-                for (i = 0; i < list.length; ++i) {
-                  length += list[i].length;
-                }
-              }
-
-              var buffer = Buffer.allocUnsafe(length);
-              var pos = 0;
-              for (i = 0; i < list.length; ++i) {
-                var buf = list[i];
-                if (!internalIsBuffer(buf)) {
-                  throw new TypeError('"list" argument must be an Array of Buffers')
-                }
-                buf.copy(buffer, pos);
-                pos += buf.length;
-              }
-              return buffer
-            };
-
-            function byteLength (string, encoding) {
-              if (internalIsBuffer(string)) {
-                return string.length
-              }
-              if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&
-                  (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {
-                return string.byteLength
-              }
-              if (typeof string !== 'string') {
-                string = '' + string;
-              }
-
-              var len = string.length;
-              if (len === 0) return 0
-
-              // Use a for loop to avoid recursion
-              var loweredCase = false;
-              for (;;) {
-                switch (encoding) {
-                  case 'ascii':
-                  case 'latin1':
-                  case 'binary':
-                    return len
-                  case 'utf8':
-                  case 'utf-8':
-                  case undefined:
-                    return utf8ToBytes(string).length
-                  case 'ucs2':
-                  case 'ucs-2':
-                  case 'utf16le':
-                  case 'utf-16le':
-                    return len * 2
-                  case 'hex':
-                    return len >>> 1
-                  case 'base64':
-                    return base64ToBytes(string).length
-                  default:
-                    if (loweredCase) return utf8ToBytes(string).length // assume utf8
-                    encoding = ('' + encoding).toLowerCase();
-                    loweredCase = true;
-                }
-              }
-            }
-            Buffer.byteLength = byteLength;
-
-            function slowToString (encoding, start, end) {
-              var loweredCase = false;
-
-              // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
-              // property of a typed array.
-
-              // This behaves neither like String nor Uint8Array in that we set start/end
-              // to their upper/lower bounds if the value passed is out of range.
-              // undefined is handled specially as per ECMA-262 6th Edition,
-              // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
-              if (start === undefined || start < 0) {
-                start = 0;
-              }
-              // Return early if start > this.length. Done here to prevent potential uint32
-              // coercion fail below.
-              if (start > this.length) {
-                return ''
-              }
-
-              if (end === undefined || end > this.length) {
-                end = this.length;
-              }
-
-              if (end <= 0) {
-                return ''
-              }
-
-              // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
-              end >>>= 0;
-              start >>>= 0;
-
-              if (end <= start) {
-                return ''
-              }
-
-              if (!encoding) encoding = 'utf8';
-
-              while (true) {
-                switch (encoding) {
-                  case 'hex':
-                    return hexSlice(this, start, end)
-
-                  case 'utf8':
-                  case 'utf-8':
-                    return utf8Slice(this, start, end)
-
-                  case 'ascii':
-                    return asciiSlice(this, start, end)
-
-                  case 'latin1':
-                  case 'binary':
-                    return latin1Slice(this, start, end)
-
-                  case 'base64':
-                    return base64Slice(this, start, end)
-
-                  case 'ucs2':
-                  case 'ucs-2':
-                  case 'utf16le':
-                  case 'utf-16le':
-                    return utf16leSlice(this, start, end)
-
-                  default:
-                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-                    encoding = (encoding + '').toLowerCase();
-                    loweredCase = true;
-                }
-              }
-            }
-
-            // The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect
-            // Buffer instances.
-            Buffer.prototype._isBuffer = true;
-
-            function swap (b, n, m) {
-              var i = b[n];
-              b[n] = b[m];
-              b[m] = i;
-            }
-
-            Buffer.prototype.swap16 = function swap16 () {
-              var len = this.length;
-              if (len % 2 !== 0) {
-                throw new RangeError('Buffer size must be a multiple of 16-bits')
-              }
-              for (var i = 0; i < len; i += 2) {
-                swap(this, i, i + 1);
-              }
-              return this
-            };
-
-            Buffer.prototype.swap32 = function swap32 () {
-              var len = this.length;
-              if (len % 4 !== 0) {
-                throw new RangeError('Buffer size must be a multiple of 32-bits')
-              }
-              for (var i = 0; i < len; i += 4) {
-                swap(this, i, i + 3);
-                swap(this, i + 1, i + 2);
-              }
-              return this
-            };
-
-            Buffer.prototype.swap64 = function swap64 () {
-              var len = this.length;
-              if (len % 8 !== 0) {
-                throw new RangeError('Buffer size must be a multiple of 64-bits')
-              }
-              for (var i = 0; i < len; i += 8) {
-                swap(this, i, i + 7);
-                swap(this, i + 1, i + 6);
-                swap(this, i + 2, i + 5);
-                swap(this, i + 3, i + 4);
-              }
-              return this
-            };
-
-            Buffer.prototype.toString = function toString () {
-              var length = this.length | 0;
-              if (length === 0) return ''
-              if (arguments.length === 0) return utf8Slice(this, 0, length)
-              return slowToString.apply(this, arguments)
-            };
-
-            Buffer.prototype.equals = function equals (b) {
-              if (!internalIsBuffer(b)) throw new TypeError('Argument must be a Buffer')
-              if (this === b) return true
-              return Buffer.compare(this, b) === 0
-            };
-
-            Buffer.prototype.inspect = function inspect () {
-              var str = '';
-              var max = INSPECT_MAX_BYTES;
-              if (this.length > 0) {
-                str = this.toString('hex', 0, max).match(/.{2}/g).join(' ');
-                if (this.length > max) str += ' ... ';
-              }
-              return '<Buffer ' + str + '>'
-            };
-
-            Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
-              if (!internalIsBuffer(target)) {
-                throw new TypeError('Argument must be a Buffer')
-              }
-
-              if (start === undefined) {
-                start = 0;
-              }
-              if (end === undefined) {
-                end = target ? target.length : 0;
-              }
-              if (thisStart === undefined) {
-                thisStart = 0;
-              }
-              if (thisEnd === undefined) {
-                thisEnd = this.length;
-              }
-
-              if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
-                throw new RangeError('out of range index')
-              }
-
-              if (thisStart >= thisEnd && start >= end) {
-                return 0
-              }
-              if (thisStart >= thisEnd) {
-                return -1
-              }
-              if (start >= end) {
-                return 1
-              }
-
-              start >>>= 0;
-              end >>>= 0;
-              thisStart >>>= 0;
-              thisEnd >>>= 0;
-
-              if (this === target) return 0
-
-              var x = thisEnd - thisStart;
-              var y = end - start;
-              var len = Math.min(x, y);
-
-              var thisCopy = this.slice(thisStart, thisEnd);
-              var targetCopy = target.slice(start, end);
-
-              for (var i = 0; i < len; ++i) {
-                if (thisCopy[i] !== targetCopy[i]) {
-                  x = thisCopy[i];
-                  y = targetCopy[i];
-                  break
-                }
-              }
-
-              if (x < y) return -1
-              if (y < x) return 1
-              return 0
-            };
-
-            // Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
-            // OR the last index of `val` in `buffer` at offset <= `byteOffset`.
-            //
-            // Arguments:
-            // - buffer - a Buffer to search
-            // - val - a string, Buffer, or number
-            // - byteOffset - an index into `buffer`; will be clamped to an int32
-            // - encoding - an optional encoding, relevant is val is a string
-            // - dir - true for indexOf, false for lastIndexOf
-            function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
-              // Empty buffer means no match
-              if (buffer.length === 0) return -1
-
-              // Normalize byteOffset
-              if (typeof byteOffset === 'string') {
-                encoding = byteOffset;
-                byteOffset = 0;
-              } else if (byteOffset > 0x7fffffff) {
-                byteOffset = 0x7fffffff;
-              } else if (byteOffset < -0x80000000) {
-                byteOffset = -0x80000000;
-              }
-              byteOffset = +byteOffset;  // Coerce to Number.
-              if (isNaN(byteOffset)) {
-                // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
-                byteOffset = dir ? 0 : (buffer.length - 1);
-              }
-
-              // Normalize byteOffset: negative offsets start from the end of the buffer
-              if (byteOffset < 0) byteOffset = buffer.length + byteOffset;
-              if (byteOffset >= buffer.length) {
-                if (dir) return -1
-                else byteOffset = buffer.length - 1;
-              } else if (byteOffset < 0) {
-                if (dir) byteOffset = 0;
-                else return -1
-              }
-
-              // Normalize val
-              if (typeof val === 'string') {
-                val = Buffer.from(val, encoding);
-              }
-
-              // Finally, search either indexOf (if dir is true) or lastIndexOf
-              if (internalIsBuffer(val)) {
-                // Special case: looking for empty string/buffer always fails
-                if (val.length === 0) {
-                  return -1
-                }
-                return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
-              } else if (typeof val === 'number') {
-                val = val & 0xFF; // Search for a byte value [0-255]
-                if (Buffer.TYPED_ARRAY_SUPPORT &&
-                    typeof Uint8Array.prototype.indexOf === 'function') {
-                  if (dir) {
-                    return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
-                  } else {
-                    return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
-                  }
-                }
-                return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
-              }
-
-              throw new TypeError('val must be string, number or Buffer')
-            }
-
-            function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
-              var indexSize = 1;
-              var arrLength = arr.length;
-              var valLength = val.length;
-
-              if (encoding !== undefined) {
-                encoding = String(encoding).toLowerCase();
-                if (encoding === 'ucs2' || encoding === 'ucs-2' ||
-                    encoding === 'utf16le' || encoding === 'utf-16le') {
-                  if (arr.length < 2 || val.length < 2) {
-                    return -1
-                  }
-                  indexSize = 2;
-                  arrLength /= 2;
-                  valLength /= 2;
-                  byteOffset /= 2;
-                }
-              }
-
-              function read$$1 (buf, i) {
-                if (indexSize === 1) {
-                  return buf[i]
-                } else {
-                  return buf.readUInt16BE(i * indexSize)
-                }
-              }
-
-              var i;
-              if (dir) {
-                var foundIndex = -1;
-                for (i = byteOffset; i < arrLength; i++) {
-                  if (read$$1(arr, i) === read$$1(val, foundIndex === -1 ? 0 : i - foundIndex)) {
-                    if (foundIndex === -1) foundIndex = i;
-                    if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
-                  } else {
-                    if (foundIndex !== -1) i -= i - foundIndex;
-                    foundIndex = -1;
-                  }
-                }
-              } else {
-                if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength;
-                for (i = byteOffset; i >= 0; i--) {
-                  var found = true;
-                  for (var j = 0; j < valLength; j++) {
-                    if (read$$1(arr, i + j) !== read$$1(val, j)) {
-                      found = false;
-                      break
-                    }
-                  }
-                  if (found) return i
-                }
-              }
-
-              return -1
-            }
-
-            Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
-              return this.indexOf(val, byteOffset, encoding) !== -1
-            };
-
-            Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
-              return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
-            };
-
-            Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
-              return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
-            };
-
-            function hexWrite (buf, string, offset, length) {
-              offset = Number(offset) || 0;
-              var remaining = buf.length - offset;
-              if (!length) {
-                length = remaining;
-              } else {
-                length = Number(length);
-                if (length > remaining) {
-                  length = remaining;
-                }
-              }
-
-              // must be an even number of digits
-              var strLen = string.length;
-              if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')
-
-              if (length > strLen / 2) {
-                length = strLen / 2;
-              }
-              for (var i = 0; i < length; ++i) {
-                var parsed = parseInt(string.substr(i * 2, 2), 16);
-                if (isNaN(parsed)) return i
-                buf[offset + i] = parsed;
-              }
-              return i
-            }
-
-            function utf8Write (buf, string, offset, length) {
-              return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
-            }
-
-            function asciiWrite (buf, string, offset, length) {
-              return blitBuffer(asciiToBytes(string), buf, offset, length)
-            }
-
-            function latin1Write (buf, string, offset, length) {
-              return asciiWrite(buf, string, offset, length)
-            }
-
-            function base64Write (buf, string, offset, length) {
-              return blitBuffer(base64ToBytes(string), buf, offset, length)
-            }
-
-            function ucs2Write (buf, string, offset, length) {
-              return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
-            }
-
-            Buffer.prototype.write = function write$$1 (string, offset, length, encoding) {
-              // Buffer#write(string)
-              if (offset === undefined) {
-                encoding = 'utf8';
-                length = this.length;
-                offset = 0;
-              // Buffer#write(string, encoding)
-              } else if (length === undefined && typeof offset === 'string') {
-                encoding = offset;
-                length = this.length;
-                offset = 0;
-              // Buffer#write(string, offset[, length][, encoding])
-              } else if (isFinite(offset)) {
-                offset = offset | 0;
-                if (isFinite(length)) {
-                  length = length | 0;
-                  if (encoding === undefined) encoding = 'utf8';
-                } else {
-                  encoding = length;
-                  length = undefined;
-                }
-              // legacy write(string, encoding, offset, length) - remove in v0.13
-              } else {
-                throw new Error(
-                  'Buffer.write(string, encoding, offset[, length]) is no longer supported'
-                )
-              }
-
-              var remaining = this.length - offset;
-              if (length === undefined || length > remaining) length = remaining;
-
-              if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-                throw new RangeError('Attempt to write outside buffer bounds')
-              }
-
-              if (!encoding) encoding = 'utf8';
-
-              var loweredCase = false;
-              for (;;) {
-                switch (encoding) {
-                  case 'hex':
-                    return hexWrite(this, string, offset, length)
-
-                  case 'utf8':
-                  case 'utf-8':
-                    return utf8Write(this, string, offset, length)
-
-                  case 'ascii':
-                    return asciiWrite(this, string, offset, length)
-
-                  case 'latin1':
-                  case 'binary':
-                    return latin1Write(this, string, offset, length)
-
-                  case 'base64':
-                    // Warning: maxLength not taken into account in base64Write
-                    return base64Write(this, string, offset, length)
-
-                  case 'ucs2':
-                  case 'ucs-2':
-                  case 'utf16le':
-                  case 'utf-16le':
-                    return ucs2Write(this, string, offset, length)
-
-                  default:
-                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-                    encoding = ('' + encoding).toLowerCase();
-                    loweredCase = true;
-                }
-              }
-            };
-
-            Buffer.prototype.toJSON = function toJSON () {
-              return {
-                type: 'Buffer',
-                data: Array.prototype.slice.call(this._arr || this, 0)
-              }
-            };
-
-            function base64Slice (buf, start, end) {
-              if (start === 0 && end === buf.length) {
-                return fromByteArray(buf)
-              } else {
-                return fromByteArray(buf.slice(start, end))
-              }
-            }
-
-            function utf8Slice (buf, start, end) {
-              end = Math.min(buf.length, end);
-              var res = [];
-
-              var i = start;
-              while (i < end) {
-                var firstByte = buf[i];
-                var codePoint = null;
-                var bytesPerSequence = (firstByte > 0xEF) ? 4
-                  : (firstByte > 0xDF) ? 3
-                  : (firstByte > 0xBF) ? 2
-                  : 1;
-
-                if (i + bytesPerSequence <= end) {
-                  var secondByte, thirdByte, fourthByte, tempCodePoint;
-
-                  switch (bytesPerSequence) {
-                    case 1:
-                      if (firstByte < 0x80) {
-                        codePoint = firstByte;
-                      }
-                      break
-                    case 2:
-                      secondByte = buf[i + 1];
-                      if ((secondByte & 0xC0) === 0x80) {
-                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F);
-                        if (tempCodePoint > 0x7F) {
-                          codePoint = tempCodePoint;
-                        }
-                      }
-                      break
-                    case 3:
-                      secondByte = buf[i + 1];
-                      thirdByte = buf[i + 2];
-                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
-                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F);
-                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
-                          codePoint = tempCodePoint;
-                        }
-                      }
-                      break
-                    case 4:
-                      secondByte = buf[i + 1];
-                      thirdByte = buf[i + 2];
-                      fourthByte = buf[i + 3];
-                      if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
-                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F);
-                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
-                          codePoint = tempCodePoint;
-                        }
-                      }
-                  }
-                }
-
-                if (codePoint === null) {
-                  // we did not generate a valid codePoint so insert a
-                  // replacement char (U+FFFD) and advance only 1 byte
-                  codePoint = 0xFFFD;
-                  bytesPerSequence = 1;
-                } else if (codePoint > 0xFFFF) {
-                  // encode to utf16 (surrogate pair dance)
-                  codePoint -= 0x10000;
-                  res.push(codePoint >>> 10 & 0x3FF | 0xD800);
-                  codePoint = 0xDC00 | codePoint & 0x3FF;
-                }
-
-                res.push(codePoint);
-                i += bytesPerSequence;
-              }
-
-              return decodeCodePointsArray(res)
-            }
-
-            // Based on http://stackoverflow.com/a/22747272/680742, the browser with
-            // the lowest limit is Chrome, with 0x10000 args.
-            // We go 1 magnitude less, for safety
-            var MAX_ARGUMENTS_LENGTH = 0x1000;
-
-            function decodeCodePointsArray (codePoints) {
-              var len = codePoints.length;
-              if (len <= MAX_ARGUMENTS_LENGTH) {
-                return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
-              }
-
-              // Decode in chunks to avoid "call stack size exceeded".
-              var res = '';
-              var i = 0;
-              while (i < len) {
-                res += String.fromCharCode.apply(
-                  String,
-                  codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
-                );
-              }
-              return res
-            }
-
-            function asciiSlice (buf, start, end) {
-              var ret = '';
-              end = Math.min(buf.length, end);
-
-              for (var i = start; i < end; ++i) {
-                ret += String.fromCharCode(buf[i] & 0x7F);
-              }
-              return ret
-            }
-
-            function latin1Slice (buf, start, end) {
-              var ret = '';
-              end = Math.min(buf.length, end);
-
-              for (var i = start; i < end; ++i) {
-                ret += String.fromCharCode(buf[i]);
-              }
-              return ret
-            }
-
-            function hexSlice (buf, start, end) {
-              var len = buf.length;
-
-              if (!start || start < 0) start = 0;
-              if (!end || end < 0 || end > len) end = len;
-
-              var out = '';
-              for (var i = start; i < end; ++i) {
-                out += toHex(buf[i]);
-              }
-              return out
-            }
-
-            function utf16leSlice (buf, start, end) {
-              var bytes = buf.slice(start, end);
-              var res = '';
-              for (var i = 0; i < bytes.length; i += 2) {
-                res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256);
-              }
-              return res
-            }
-
-            Buffer.prototype.slice = function slice (start, end) {
-              var len = this.length;
-              start = ~~start;
-              end = end === undefined ? len : ~~end;
-
-              if (start < 0) {
-                start += len;
-                if (start < 0) start = 0;
-              } else if (start > len) {
-                start = len;
-              }
-
-              if (end < 0) {
-                end += len;
-                if (end < 0) end = 0;
-              } else if (end > len) {
-                end = len;
-              }
-
-              if (end < start) end = start;
-
-              var newBuf;
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                newBuf = this.subarray(start, end);
-                newBuf.__proto__ = Buffer.prototype;
-              } else {
-                var sliceLen = end - start;
-                newBuf = new Buffer(sliceLen, undefined);
-                for (var i = 0; i < sliceLen; ++i) {
-                  newBuf[i] = this[i + start];
-                }
-              }
-
-              return newBuf
-            };
-
-            /*
-             * Need to make sure that buffer isn't trying to write out of bounds.
-             */
-            function checkOffset (offset, ext, length) {
-              if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
-              if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
-            }
-
-            Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) checkOffset(offset, byteLength, this.length);
-
-              var val = this[offset];
-              var mul = 1;
-              var i = 0;
-              while (++i < byteLength && (mul *= 0x100)) {
-                val += this[offset + i] * mul;
-              }
-
-              return val
-            };
-
-            Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) {
-                checkOffset(offset, byteLength, this.length);
-              }
-
-              var val = this[offset + --byteLength];
-              var mul = 1;
-              while (byteLength > 0 && (mul *= 0x100)) {
-                val += this[offset + --byteLength] * mul;
-              }
-
-              return val
-            };
-
-            Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 1, this.length);
-              return this[offset]
-            };
-
-            Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 2, this.length);
-              return this[offset] | (this[offset + 1] << 8)
-            };
-
-            Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 2, this.length);
-              return (this[offset] << 8) | this[offset + 1]
-            };
-
-            Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-
-              return ((this[offset]) |
-                  (this[offset + 1] << 8) |
-                  (this[offset + 2] << 16)) +
-                  (this[offset + 3] * 0x1000000)
-            };
-
-            Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-
-              return (this[offset] * 0x1000000) +
-                ((this[offset + 1] << 16) |
-                (this[offset + 2] << 8) |
-                this[offset + 3])
-            };
-
-            Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) checkOffset(offset, byteLength, this.length);
-
-              var val = this[offset];
-              var mul = 1;
-              var i = 0;
-              while (++i < byteLength && (mul *= 0x100)) {
-                val += this[offset + i] * mul;
-              }
-              mul *= 0x80;
-
-              if (val >= mul) val -= Math.pow(2, 8 * byteLength);
-
-              return val
-            };
-
-            Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) checkOffset(offset, byteLength, this.length);
-
-              var i = byteLength;
-              var mul = 1;
-              var val = this[offset + --i];
-              while (i > 0 && (mul *= 0x100)) {
-                val += this[offset + --i] * mul;
-              }
-              mul *= 0x80;
-
-              if (val >= mul) val -= Math.pow(2, 8 * byteLength);
-
-              return val
-            };
-
-            Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 1, this.length);
-              if (!(this[offset] & 0x80)) return (this[offset])
-              return ((0xff - this[offset] + 1) * -1)
-            };
-
-            Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 2, this.length);
-              var val = this[offset] | (this[offset + 1] << 8);
-              return (val & 0x8000) ? val | 0xFFFF0000 : val
-            };
-
-            Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 2, this.length);
-              var val = this[offset + 1] | (this[offset] << 8);
-              return (val & 0x8000) ? val | 0xFFFF0000 : val
-            };
-
-            Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-
-              return (this[offset]) |
-                (this[offset + 1] << 8) |
-                (this[offset + 2] << 16) |
-                (this[offset + 3] << 24)
-            };
-
-            Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-
-              return (this[offset] << 24) |
-                (this[offset + 1] << 16) |
-                (this[offset + 2] << 8) |
-                (this[offset + 3])
-            };
-
-            Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-              return read(this, offset, true, 23, 4)
-            };
-
-            Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 4, this.length);
-              return read(this, offset, false, 23, 4)
-            };
-
-            Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 8, this.length);
-              return read(this, offset, true, 52, 8)
-            };
-
-            Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
-              if (!noAssert) checkOffset(offset, 8, this.length);
-              return read(this, offset, false, 52, 8)
-            };
-
-            function checkInt (buf, value, offset, ext, max, min) {
-              if (!internalIsBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
-              if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
-              if (offset + ext > buf.length) throw new RangeError('Index out of range')
-            }
-
-            Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) {
-                var maxBytes = Math.pow(2, 8 * byteLength) - 1;
-                checkInt(this, value, offset, byteLength, maxBytes, 0);
-              }
-
-              var mul = 1;
-              var i = 0;
-              this[offset] = value & 0xFF;
-              while (++i < byteLength && (mul *= 0x100)) {
-                this[offset + i] = (value / mul) & 0xFF;
-              }
-
-              return offset + byteLength
-            };
-
-            Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              byteLength = byteLength | 0;
-              if (!noAssert) {
-                var maxBytes = Math.pow(2, 8 * byteLength) - 1;
-                checkInt(this, value, offset, byteLength, maxBytes, 0);
-              }
-
-              var i = byteLength - 1;
-              var mul = 1;
-              this[offset + i] = value & 0xFF;
-              while (--i >= 0 && (mul *= 0x100)) {
-                this[offset + i] = (value / mul) & 0xFF;
-              }
-
-              return offset + byteLength
-            };
-
-            Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0);
-              if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
-              this[offset] = (value & 0xff);
-              return offset + 1
-            };
-
-            function objectWriteUInt16 (buf, value, offset, littleEndian) {
-              if (value < 0) value = 0xffff + value + 1;
-              for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {
-                buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>
-                  (littleEndian ? i : 1 - i) * 8;
-              }
-            }
-
-            Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value & 0xff);
-                this[offset + 1] = (value >>> 8);
-              } else {
-                objectWriteUInt16(this, value, offset, true);
-              }
-              return offset + 2
-            };
-
-            Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value >>> 8);
-                this[offset + 1] = (value & 0xff);
-              } else {
-                objectWriteUInt16(this, value, offset, false);
-              }
-              return offset + 2
-            };
-
-            function objectWriteUInt32 (buf, value, offset, littleEndian) {
-              if (value < 0) value = 0xffffffff + value + 1;
-              for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {
-                buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff;
-              }
-            }
-
-            Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset + 3] = (value >>> 24);
-                this[offset + 2] = (value >>> 16);
-                this[offset + 1] = (value >>> 8);
-                this[offset] = (value & 0xff);
-              } else {
-                objectWriteUInt32(this, value, offset, true);
-              }
-              return offset + 4
-            };
-
-            Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value >>> 24);
-                this[offset + 1] = (value >>> 16);
-                this[offset + 2] = (value >>> 8);
-                this[offset + 3] = (value & 0xff);
-              } else {
-                objectWriteUInt32(this, value, offset, false);
-              }
-              return offset + 4
-            };
-
-            Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) {
-                var limit = Math.pow(2, 8 * byteLength - 1);
-
-                checkInt(this, value, offset, byteLength, limit - 1, -limit);
-              }
-
-              var i = 0;
-              var mul = 1;
-              var sub = 0;
-              this[offset] = value & 0xFF;
-              while (++i < byteLength && (mul *= 0x100)) {
-                if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
-                  sub = 1;
-                }
-                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
-              }
-
-              return offset + byteLength
-            };
-
-            Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) {
-                var limit = Math.pow(2, 8 * byteLength - 1);
-
-                checkInt(this, value, offset, byteLength, limit - 1, -limit);
-              }
-
-              var i = byteLength - 1;
-              var mul = 1;
-              var sub = 0;
-              this[offset + i] = value & 0xFF;
-              while (--i >= 0 && (mul *= 0x100)) {
-                if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
-                  sub = 1;
-                }
-                this[offset + i] = ((value / mul) >> 0) - sub & 0xFF;
-              }
-
-              return offset + byteLength
-            };
-
-            Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80);
-              if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value);
-              if (value < 0) value = 0xff + value + 1;
-              this[offset] = (value & 0xff);
-              return offset + 1
-            };
-
-            Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value & 0xff);
-                this[offset + 1] = (value >>> 8);
-              } else {
-                objectWriteUInt16(this, value, offset, true);
-              }
-              return offset + 2
-            };
-
-            Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value >>> 8);
-                this[offset + 1] = (value & 0xff);
-              } else {
-                objectWriteUInt16(this, value, offset, false);
-              }
-              return offset + 2
-            };
-
-            Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value & 0xff);
-                this[offset + 1] = (value >>> 8);
-                this[offset + 2] = (value >>> 16);
-                this[offset + 3] = (value >>> 24);
-              } else {
-                objectWriteUInt32(this, value, offset, true);
-              }
-              return offset + 4
-            };
-
-            Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
-              value = +value;
-              offset = offset | 0;
-              if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000);
-              if (value < 0) value = 0xffffffff + value + 1;
-              if (Buffer.TYPED_ARRAY_SUPPORT) {
-                this[offset] = (value >>> 24);
-                this[offset + 1] = (value >>> 16);
-                this[offset + 2] = (value >>> 8);
-                this[offset + 3] = (value & 0xff);
-              } else {
-                objectWriteUInt32(this, value, offset, false);
-              }
-              return offset + 4
-            };
-
-            function checkIEEE754 (buf, value, offset, ext, max, min) {
-              if (offset + ext > buf.length) throw new RangeError('Index out of range')
-              if (offset < 0) throw new RangeError('Index out of range')
-            }
-
-            function writeFloat (buf, value, offset, littleEndian, noAssert) {
-              if (!noAssert) {
-                checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38);
-              }
-              write(buf, value, offset, littleEndian, 23, 4);
-              return offset + 4
-            }
-
-            Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
-              return writeFloat(this, value, offset, true, noAssert)
-            };
-
-            Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
-              return writeFloat(this, value, offset, false, noAssert)
-            };
-
-            function writeDouble (buf, value, offset, littleEndian, noAssert) {
-              if (!noAssert) {
-                checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308);
-              }
-              write(buf, value, offset, littleEndian, 52, 8);
-              return offset + 8
-            }
-
-            Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
-              return writeDouble(this, value, offset, true, noAssert)
-            };
-
-            Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
-              return writeDouble(this, value, offset, false, noAssert)
-            };
-
-            // copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
-            Buffer.prototype.copy = function copy (target, targetStart, start, end) {
-              if (!start) start = 0;
-              if (!end && end !== 0) end = this.length;
-              if (targetStart >= target.length) targetStart = target.length;
-              if (!targetStart) targetStart = 0;
-              if (end > 0 && end < start) end = start;
-
-              // Copy 0 bytes; we're done
-              if (end === start) return 0
-              if (target.length === 0 || this.length === 0) return 0
-
-              // Fatal error conditions
-              if (targetStart < 0) {
-                throw new RangeError('targetStart out of bounds')
-              }
-              if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
-              if (end < 0) throw new RangeError('sourceEnd out of bounds')
-
-              // Are we oob?
-              if (end > this.length) end = this.length;
-              if (target.length - targetStart < end - start) {
-                end = target.length - targetStart + start;
-              }
-
-              var len = end - start;
-              var i;
-
-              if (this === target && start < targetStart && targetStart < end) {
-                // descending copy from end
-                for (i = len - 1; i >= 0; --i) {
-                  target[i + targetStart] = this[i + start];
-                }
-              } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {
-                // ascending copy from start
-                for (i = 0; i < len; ++i) {
-                  target[i + targetStart] = this[i + start];
-                }
-              } else {
-                Uint8Array.prototype.set.call(
-                  target,
-                  this.subarray(start, start + len),
-                  targetStart
-                );
-              }
-
-              return len
-            };
-
-            // Usage:
-            //    buffer.fill(number[, offset[, end]])
-            //    buffer.fill(buffer[, offset[, end]])
-            //    buffer.fill(string[, offset[, end]][, encoding])
-            Buffer.prototype.fill = function fill (val, start, end, encoding) {
-              // Handle string cases:
-              if (typeof val === 'string') {
-                if (typeof start === 'string') {
-                  encoding = start;
-                  start = 0;
-                  end = this.length;
-                } else if (typeof end === 'string') {
-                  encoding = end;
-                  end = this.length;
-                }
-                if (val.length === 1) {
-                  var code = val.charCodeAt(0);
-                  if (code < 256) {
-                    val = code;
-                  }
-                }
-                if (encoding !== undefined && typeof encoding !== 'string') {
-                  throw new TypeError('encoding must be a string')
-                }
-                if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
-                  throw new TypeError('Unknown encoding: ' + encoding)
-                }
-              } else if (typeof val === 'number') {
-                val = val & 255;
-              }
-
-              // Invalid ranges are not set to a default, so can range check early.
-              if (start < 0 || this.length < start || this.length < end) {
-                throw new RangeError('Out of range index')
-              }
-
-              if (end <= start) {
-                return this
-              }
-
-              start = start >>> 0;
-              end = end === undefined ? this.length : end >>> 0;
-
-              if (!val) val = 0;
-
-              var i;
-              if (typeof val === 'number') {
-                for (i = start; i < end; ++i) {
-                  this[i] = val;
-                }
-              } else {
-                var bytes = internalIsBuffer(val)
-                  ? val
-                  : utf8ToBytes(new Buffer(val, encoding).toString());
-                var len = bytes.length;
-                for (i = 0; i < end - start; ++i) {
-                  this[i + start] = bytes[i % len];
-                }
-              }
-
-              return this
-            };
-
-            // HELPER FUNCTIONS
-            // ================
-
-            var INVALID_BASE64_RE = /[^+\/0-9A-Za-z-_]/g;
-
-            function base64clean (str) {
-              // Node strips out invalid characters like \n and \t from the string, base64-js does not
-              str = stringtrim(str).replace(INVALID_BASE64_RE, '');
-              // Node converts strings with length < 2 to ''
-              if (str.length < 2) return ''
-              // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
-              while (str.length % 4 !== 0) {
-                str = str + '=';
-              }
-              return str
-            }
-
-            function stringtrim (str) {
-              if (str.trim) return str.trim()
-              return str.replace(/^\s+|\s+$/g, '')
-            }
-
-            function toHex (n) {
-              if (n < 16) return '0' + n.toString(16)
-              return n.toString(16)
-            }
-
-            function utf8ToBytes (string, units) {
-              units = units || Infinity;
-              var codePoint;
-              var length = string.length;
-              var leadSurrogate = null;
-              var bytes = [];
-
-              for (var i = 0; i < length; ++i) {
-                codePoint = string.charCodeAt(i);
-
-                // is surrogate component
-                if (codePoint > 0xD7FF && codePoint < 0xE000) {
-                  // last char was a lead
-                  if (!leadSurrogate) {
-                    // no lead yet
-                    if (codePoint > 0xDBFF) {
-                      // unexpected trail
-                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
-                      continue
-                    } else if (i + 1 === length) {
-                      // unpaired lead
-                      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
-                      continue
-                    }
-
-                    // valid lead
-                    leadSurrogate = codePoint;
-
-                    continue
-                  }
-
-                  // 2 leads in a row
-                  if (codePoint < 0xDC00) {
-                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
-                    leadSurrogate = codePoint;
-                    continue
-                  }
-
-                  // valid surrogate pair
-                  codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000;
-                } else if (leadSurrogate) {
-                  // valid bmp char, but last char was a lead
-                  if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD);
-                }
-
-                leadSurrogate = null;
-
-                // encode utf8
-                if (codePoint < 0x80) {
-                  if ((units -= 1) < 0) break
-                  bytes.push(codePoint);
-                } else if (codePoint < 0x800) {
-                  if ((units -= 2) < 0) break
-                  bytes.push(
-                    codePoint >> 0x6 | 0xC0,
-                    codePoint & 0x3F | 0x80
-                  );
-                } else if (codePoint < 0x10000) {
-                  if ((units -= 3) < 0) break
-                  bytes.push(
-                    codePoint >> 0xC | 0xE0,
-                    codePoint >> 0x6 & 0x3F | 0x80,
-                    codePoint & 0x3F | 0x80
-                  );
-                } else if (codePoint < 0x110000) {
-                  if ((units -= 4) < 0) break
-                  bytes.push(
-                    codePoint >> 0x12 | 0xF0,
-                    codePoint >> 0xC & 0x3F | 0x80,
-                    codePoint >> 0x6 & 0x3F | 0x80,
-                    codePoint & 0x3F | 0x80
-                  );
-                } else {
-                  throw new Error('Invalid code point')
-                }
-              }
-
-              return bytes
-            }
-
-            function asciiToBytes (str) {
-              var byteArray = [];
-              for (var i = 0; i < str.length; ++i) {
-                // Node's code seems to be doing this and not & 0x7F..
-                byteArray.push(str.charCodeAt(i) & 0xFF);
-              }
-              return byteArray
-            }
-
-            function utf16leToBytes (str, units) {
-              var c, hi, lo;
-              var byteArray = [];
-              for (var i = 0; i < str.length; ++i) {
-                if ((units -= 2) < 0) break
-
-                c = str.charCodeAt(i);
-                hi = c >> 8;
-                lo = c % 256;
-                byteArray.push(lo);
-                byteArray.push(hi);
-              }
-
-              return byteArray
-            }
-
-
-            function base64ToBytes (str) {
-              return toByteArray(base64clean(str))
-            }
-
-            function blitBuffer (src, dst, offset, length) {
-              for (var i = 0; i < length; ++i) {
-                if ((i + offset >= dst.length) || (i >= src.length)) break
-                dst[i + offset] = src[i];
-              }
-              return i
-            }
-
-            function isnan (val) {
-              return val !== val // eslint-disable-line no-self-compare
-            }
-
-
-            // the following is from is-buffer, also by Feross Aboukhadijeh and with same lisence
-            // The _isBuffer check is for Safari 5-7 support, because it's missing
-            // Object.prototype.constructor. Remove this eventually
-            function isBuffer(obj) {
-              return obj != null && (!!obj._isBuffer || isFastBuffer(obj) || isSlowBuffer(obj))
-            }
-
-            function isFastBuffer (obj) {
-              return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
-            }
-
-            // For Node v0.10 support. Remove this eventually.
-            function isSlowBuffer (obj) {
-              return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isFastBuffer(obj.slice(0, 0))
-            }
-
-            function _classCallCheck(instance, Constructor) {
-              if (!(instance instanceof Constructor)) {
-                throw new TypeError("Cannot call a class as a function");
-              }
-            }
-
-            function _defineProperties(target, props) {
-              for (var i = 0; i < props.length; i++) {
-                var descriptor = props[i];
-                descriptor.enumerable = descriptor.enumerable || false;
-                descriptor.configurable = true;
-                if ("value" in descriptor) descriptor.writable = true;
-                Object.defineProperty(target, descriptor.key, descriptor);
-              }
-            }
-
-            function _createClass(Constructor, protoProps, staticProps) {
-              if (protoProps) _defineProperties(Constructor.prototype, protoProps);
-              if (staticProps) _defineProperties(Constructor, staticProps);
-              return Constructor;
-            }
-
-            function _defineProperty(obj, key, value) {
-              if (key in obj) {
-                Object.defineProperty(obj, key, {
-                  value: value,
-                  enumerable: true,
-                  configurable: true,
-                  writable: true
-                });
-              } else {
-                obj[key] = value;
-              }
-
-              return obj;
-            }
-
-            function _objectSpread(target) {
-              for (var i = 1; i < arguments.length; i++) {
-                var source = arguments[i] != null ? arguments[i] : {};
-                var ownKeys = Object.keys(source);
-
-                if (typeof Object.getOwnPropertySymbols === 'function') {
-                  ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) {
-                    return Object.getOwnPropertyDescriptor(source, sym).enumerable;
-                  }));
-                }
-
-                ownKeys.forEach(function (key) {
-                  _defineProperty(target, key, source[key]);
-                });
-              }
-
-              return target;
-            }
-
-            function _inherits(subClass, superClass) {
-              if (typeof superClass !== "function" && superClass !== null) {
-                throw new TypeError("Super expression must either be null or a function");
-              }
-
-              subClass.prototype = Object.create(superClass && superClass.prototype, {
-                constructor: {
-                  value: subClass,
-                  writable: true,
-                  configurable: true
-                }
-              });
-              if (superClass) _setPrototypeOf(subClass, superClass);
-            }
-
-            function _getPrototypeOf(o) {
-              _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
-                return o.__proto__ || Object.getPrototypeOf(o);
-              };
-              return _getPrototypeOf(o);
-            }
-
-            function _setPrototypeOf(o, p) {
-              _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
-                o.__proto__ = p;
-                return o;
-              };
-
-              return _setPrototypeOf(o, p);
-            }
-
-            function _objectWithoutPropertiesLoose(source, excluded) {
-              if (source == null) return {};
-              var target = {};
-              var sourceKeys = Object.keys(source);
-              var key, i;
-
-              for (i = 0; i < sourceKeys.length; i++) {
-                key = sourceKeys[i];
-                if (excluded.indexOf(key) >= 0) continue;
-                target[key] = source[key];
-              }
-
-              return target;
-            }
-
-            function _objectWithoutProperties(source, excluded) {
-              if (source == null) return {};
-
-              var target = _objectWithoutPropertiesLoose(source, excluded);
-
-              var key, i;
-
-              if (Object.getOwnPropertySymbols) {
-                var sourceSymbolKeys = Object.getOwnPropertySymbols(source);
-
-                for (i = 0; i < sourceSymbolKeys.length; i++) {
-                  key = sourceSymbolKeys[i];
-                  if (excluded.indexOf(key) >= 0) continue;
-                  if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue;
-                  target[key] = source[key];
-                }
-              }
-
-              return target;
-            }
-
-            function _assertThisInitialized(self) {
-              if (self === void 0) {
-                throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
-              }
-
-              return self;
-            }
-
-            function _possibleConstructorReturn(self, call) {
-              if (call && (typeof call === "object" || typeof call === "function")) {
-                return call;
-              }
-
-              return _assertThisInitialized(self);
-            }
-
-            function _slicedToArray(arr, i) {
-              return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest();
-            }
-
-            function _toConsumableArray(arr) {
-              return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
-            }
-
-            function _arrayWithoutHoles(arr) {
-              if (Array.isArray(arr)) {
-                for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];
-
-                return arr2;
-              }
-            }
-
-            function _arrayWithHoles(arr) {
-              if (Array.isArray(arr)) return arr;
-            }
-
-            function _iterableToArray(iter) {
-              if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
-            }
-
-            function _iterableToArrayLimit(arr, i) {
-              var _arr = [];
-              var _n = true;
-              var _d = false;
-              var _e = undefined;
-
-              try {
-                for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
-                  _arr.push(_s.value);
-
-                  if (i && _arr.length === i) break;
-                }
-              } catch (err) {
-                _d = true;
-                _e = err;
-              } finally {
-                try {
-                  if (!_n && _i["return"] != null) _i["return"]();
-                } finally {
-                  if (_d) throw _e;
-                }
-              }
-
-              return _arr;
-            }
-
-            function _nonIterableSpread() {
-              throw new TypeError("Invalid attempt to spread non-iterable instance");
-            }
-
-            function _nonIterableRest() {
-              throw new TypeError("Invalid attempt to destructure non-iterable instance");
-            }
-
-            var _isObject = function (it) {
-              return typeof it === 'object' ? it !== null : typeof it === 'function';
-            };
-
-            var _anObject = function (it) {
-              if (!_isObject(it)) throw TypeError(it + ' is not an object!');
-              return it;
-            };
-
-            var _fails = function (exec) {
-              try {
-                return !!exec();
-              } catch (e) {
-                return true;
-              }
-            };
-
-            // Thank's IE8 for his funny defineProperty
-            var _descriptors = !_fails(function () {
-              return Object.defineProperty({}, 'a', { get: function () { return 7; } }).a != 7;
-            });
-
-            function createCommonjsModule(fn, module) {
-            	return module = { exports: {} }, fn(module, module.exports), module.exports;
-            }
-
-            var _global = createCommonjsModule(function (module) {
-            // https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
-            var global = module.exports = typeof window != 'undefined' && window.Math == Math
-              ? window : typeof self != 'undefined' && self.Math == Math ? self
-              // eslint-disable-next-line no-new-func
-              : Function('return this')();
-            if (typeof __g == 'number') __g = global; // eslint-disable-line no-undef
-            });
-
-            var document = _global.document;
-            // typeof document.createElement is 'object' in old IE
-            var is = _isObject(document) && _isObject(document.createElement);
-            var _domCreate = function (it) {
-              return is ? document.createElement(it) : {};
-            };
-
-            var _ie8DomDefine = !_descriptors && !_fails(function () {
-              return Object.defineProperty(_domCreate('div'), 'a', { get: function () { return 7; } }).a != 7;
-            });
-
-            // 7.1.1 ToPrimitive(input [, PreferredType])
-
-            // instead of the ES6 spec version, we didn't implement @@toPrimitive case
-            // and the second argument - flag - preferred type is a string
-            var _toPrimitive = function (it, S) {
-              if (!_isObject(it)) return it;
-              var fn, val;
-              if (S && typeof (fn = it.toString) == 'function' && !_isObject(val = fn.call(it))) return val;
-              if (typeof (fn = it.valueOf) == 'function' && !_isObject(val = fn.call(it))) return val;
-              if (!S && typeof (fn = it.toString) == 'function' && !_isObject(val = fn.call(it))) return val;
-              throw TypeError("Can't convert object to primitive value");
-            };
-
-            var dP = Object.defineProperty;
-
-            var f = _descriptors ? Object.defineProperty : function defineProperty(O, P, Attributes) {
-              _anObject(O);
-              P = _toPrimitive(P, true);
-              _anObject(Attributes);
-              if (_ie8DomDefine) try {
-                return dP(O, P, Attributes);
-              } catch (e) { /* empty */ }
-              if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported!');
-              if ('value' in Attributes) O[P] = Attributes.value;
-              return O;
-            };
-
-            var _objectDp = {
-            	f: f
-            };
-
-            var dP$1 = _objectDp.f;
-            var FProto = Function.prototype;
-            var nameRE = /^\s*function ([^ (]*)/;
-            var NAME = 'name';
-
-            // 19.2.4.2 name
-            NAME in FProto || _descriptors && dP$1(FProto, NAME, {
-              configurable: true,
-              get: function () {
-                try {
-                  return ('' + this).match(nameRE)[1];
-                } catch (e) {
-                  return '';
-                }
-              }
-            });
-
-            var _core = createCommonjsModule(function (module) {
-            var core = module.exports = { version: '2.5.7' };
-            if (typeof __e == 'number') __e = core; // eslint-disable-line no-undef
-            });
-            var _core_1 = _core.version;
-
-            var _propertyDesc = function (bitmap, value) {
-              return {
-                enumerable: !(bitmap & 1),
-                configurable: !(bitmap & 2),
-                writable: !(bitmap & 4),
-                value: value
-              };
-            };
-
-            var _hide = _descriptors ? function (object, key, value) {
-              return _objectDp.f(object, key, _propertyDesc(1, value));
-            } : function (object, key, value) {
-              object[key] = value;
-              return object;
-            };
-
-            var hasOwnProperty = {}.hasOwnProperty;
-            var _has = function (it, key) {
-              return hasOwnProperty.call(it, key);
-            };
-
-            var id$1 = 0;
-            var px = Math.random();
-            var _uid = function (key) {
-              return 'Symbol('.concat(key === undefined ? '' : key, ')_', (++id$1 + px).toString(36));
-            };
-
-            var _redefine = createCommonjsModule(function (module) {
-            var SRC = _uid('src');
-            var TO_STRING = 'toString';
-            var $toString = Function[TO_STRING];
-            var TPL = ('' + $toString).split(TO_STRING);
-
-            _core.inspectSource = function (it) {
-              return $toString.call(it);
-            };
-
-            (module.exports = function (O, key, val, safe) {
-              var isFunction = typeof val == 'function';
-              if (isFunction) _has(val, 'name') || _hide(val, 'name', key);
-              if (O[key] === val) return;
-              if (isFunction) _has(val, SRC) || _hide(val, SRC, O[key] ? '' + O[key] : TPL.join(String(key)));
-              if (O === _global) {
-                O[key] = val;
-              } else if (!safe) {
-                delete O[key];
-                _hide(O, key, val);
-              } else if (O[key]) {
-                O[key] = val;
-              } else {
-                _hide(O, key, val);
-              }
-            // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
-            })(Function.prototype, TO_STRING, function toString() {
-              return typeof this == 'function' && this[SRC] || $toString.call(this);
-            });
-            });
-
-            var _aFunction = function (it) {
-              if (typeof it != 'function') throw TypeError(it + ' is not a function!');
-              return it;
-            };
-
-            // optional / simple context binding
-
-            var _ctx = function (fn, that, length) {
-              _aFunction(fn);
-              if (that === undefined) return fn;
-              switch (length) {
-                case 1: return function (a) {
-                  return fn.call(that, a);
-                };
-                case 2: return function (a, b) {
-                  return fn.call(that, a, b);
-                };
-                case 3: return function (a, b, c) {
-                  return fn.call(that, a, b, c);
-                };
-              }
-              return function (/* ...args */) {
-                return fn.apply(that, arguments);
-              };
-            };
-
-            var PROTOTYPE = 'prototype';
-
-            var $export = function (type, name, source) {
-              var IS_FORCED = type & $export.F;
-              var IS_GLOBAL = type & $export.G;
-              var IS_STATIC = type & $export.S;
-              var IS_PROTO = type & $export.P;
-              var IS_BIND = type & $export.B;
-              var target = IS_GLOBAL ? _global : IS_STATIC ? _global[name] || (_global[name] = {}) : (_global[name] || {})[PROTOTYPE];
-              var exports = IS_GLOBAL ? _core : _core[name] || (_core[name] = {});
-              var expProto = exports[PROTOTYPE] || (exports[PROTOTYPE] = {});
-              var key, own, out, exp;
-              if (IS_GLOBAL) source = name;
-              for (key in source) {
-                // contains in native
-                own = !IS_FORCED && target && target[key] !== undefined;
-                // export native or passed
-                out = (own ? target : source)[key];
-                // bind timers to global for call from export context
-                exp = IS_BIND && own ? _ctx(out, _global) : IS_PROTO && typeof out == 'function' ? _ctx(Function.call, out) : out;
-                // extend global
-                if (target) _redefine(target, key, out, type & $export.U);
-                // export
-                if (exports[key] != out) _hide(exports, key, exp);
-                if (IS_PROTO && expProto[key] != out) expProto[key] = out;
-              }
-            };
-            _global.core = _core;
-            // type bitmap
-            $export.F = 1;   // forced
-            $export.G = 2;   // global
-            $export.S = 4;   // static
-            $export.P = 8;   // proto
-            $export.B = 16;  // bind
-            $export.W = 32;  // wrap
-            $export.U = 64;  // safe
-            $export.R = 128; // real proto method for `library`
-            var _export = $export;
-
-            // 7.1.4 ToInteger
-            var ceil = Math.ceil;
-            var floor = Math.floor;
-            var _toInteger = function (it) {
-              return isNaN(it = +it) ? 0 : (it > 0 ? floor : ceil)(it);
-            };
-
-            // 7.1.15 ToLength
-
-            var min = Math.min;
-            var _toLength = function (it) {
-              return it > 0 ? min(_toInteger(it), 0x1fffffffffffff) : 0; // pow(2, 53) - 1 == 9007199254740991
-            };
-
-            // 7.2.1 RequireObjectCoercible(argument)
-            var _defined = function (it) {
-              if (it == undefined) throw TypeError("Can't call method on  " + it);
-              return it;
-            };
-
-            var _stringRepeat = function repeat(count) {
-              var str = String(_defined(this));
-              var res = '';
-              var n = _toInteger(count);
-              if (n < 0 || n == Infinity) throw RangeError("Count can't be negative");
-              for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) res += str;
-              return res;
-            };
-
-            // https://github.com/tc39/proposal-string-pad-start-end
-
-
-
-
-            var _stringPad = function (that, maxLength, fillString, left) {
-              var S = String(_defined(that));
-              var stringLength = S.length;
-              var fillStr = fillString === undefined ? ' ' : String(fillString);
-              var intMaxLength = _toLength(maxLength);
-              if (intMaxLength <= stringLength || fillStr == '') return S;
-              var fillLen = intMaxLength - stringLength;
-              var stringFiller = _stringRepeat.call(fillStr, Math.ceil(fillLen / fillStr.length));
-              if (stringFiller.length > fillLen) stringFiller = stringFiller.slice(0, fillLen);
-              return left ? stringFiller + S : S + stringFiller;
-            };
-
-            var navigator = _global.navigator;
-
-            var _userAgent = navigator && navigator.userAgent || '';
-
-            // https://github.com/tc39/proposal-string-pad-start-end
-
-
-
-
-            // https://github.com/zloirock/core-js/issues/280
-            _export(_export.P + _export.F * /Version\/10\.\d+(\.\d+)? Safari\//.test(_userAgent), 'String', {
-              padStart: function padStart(maxLength /* , fillString = ' ' */) {
-                return _stringPad(this, maxLength, arguments.length > 1 ? arguments[1] : undefined, true);
-              }
-            });
-
-            var toString$1 = {}.toString;
-
-            var _cof = function (it) {
-              return toString$1.call(it).slice(8, -1);
-            };
-
-            var f$1 = {}.propertyIsEnumerable;
-
-            var _objectPie = {
-            	f: f$1
-            };
-
-            // fallback for non-array-like ES3 and non-enumerable old V8 strings
-
-            // eslint-disable-next-line no-prototype-builtins
-            var _iobject = Object('z').propertyIsEnumerable(0) ? Object : function (it) {
-              return _cof(it) == 'String' ? it.split('') : Object(it);
-            };
-
-            // to indexed object, toObject with fallback for non-array-like ES3 strings
-
-
-            var _toIobject = function (it) {
-              return _iobject(_defined(it));
-            };
-
-            var gOPD = Object.getOwnPropertyDescriptor;
-
-            var f$2 = _descriptors ? gOPD : function getOwnPropertyDescriptor(O, P) {
-              O = _toIobject(O);
-              P = _toPrimitive(P, true);
-              if (_ie8DomDefine) try {
-                return gOPD(O, P);
-              } catch (e) { /* empty */ }
-              if (_has(O, P)) return _propertyDesc(!_objectPie.f.call(O, P), O[P]);
-            };
-
-            var _objectGopd = {
-            	f: f$2
-            };
-
-            // Works with __proto__ only. Old v8 can't work with null proto objects.
-            /* eslint-disable no-proto */
-
-
-            var check = function (O, proto) {
-              _anObject(O);
-              if (!_isObject(proto) && proto !== null) throw TypeError(proto + ": can't set as prototype!");
-            };
-            var _setProto = {
-              set: Object.setPrototypeOf || ('__proto__' in {} ? // eslint-disable-line
-                function (test, buggy, set) {
-                  try {
-                    set = _ctx(Function.call, _objectGopd.f(Object.prototype, '__proto__').set, 2);
-                    set(test, []);
-                    buggy = !(test instanceof Array);
-                  } catch (e) { buggy = true; }
-                  return function setPrototypeOf(O, proto) {
-                    check(O, proto);
-                    if (buggy) O.__proto__ = proto;
-                    else set(O, proto);
-                    return O;
-                  };
-                }({}, false) : undefined),
-              check: check
-            };
-
-            var setPrototypeOf = _setProto.set;
-            var _inheritIfRequired = function (that, target, C) {
-              var S = target.constructor;
-              var P;
-              if (S !== C && typeof S == 'function' && (P = S.prototype) !== C.prototype && _isObject(P) && setPrototypeOf) {
-                setPrototypeOf(that, P);
-              } return that;
-            };
-
-            var max = Math.max;
-            var min$1 = Math.min;
-            var _toAbsoluteIndex = function (index, length) {
-              index = _toInteger(index);
-              return index < 0 ? max(index + length, 0) : min$1(index, length);
-            };
-
-            // false -> Array#indexOf
-            // true  -> Array#includes
-
-
-
-            var _arrayIncludes = function (IS_INCLUDES) {
-              return function ($this, el, fromIndex) {
-                var O = _toIobject($this);
-                var length = _toLength(O.length);
-                var index = _toAbsoluteIndex(fromIndex, length);
-                var value;
-                // Array#includes uses SameValueZero equality algorithm
-                // eslint-disable-next-line no-self-compare
-                if (IS_INCLUDES && el != el) while (length > index) {
-                  value = O[index++];
-                  // eslint-disable-next-line no-self-compare
-                  if (value != value) return true;
-                // Array#indexOf ignores holes, Array#includes - not
-                } else for (;length > index; index++) if (IS_INCLUDES || index in O) {
-                  if (O[index] === el) return IS_INCLUDES || index || 0;
-                } return !IS_INCLUDES && -1;
-              };
-            };
-
-            var _library = false;
-
-            var _shared = createCommonjsModule(function (module) {
-            var SHARED = '__core-js_shared__';
-            var store = _global[SHARED] || (_global[SHARED] = {});
-
-            (module.exports = function (key, value) {
-              return store[key] || (store[key] = value !== undefined ? value : {});
-            })('versions', []).push({
-              version: _core.version,
-              mode: _library ? 'pure' : 'global',
-              copyright: '© 2018 Denis Pushkarev (zloirock.ru)'
-            });
-            });
-
-            var shared = _shared('keys');
-
-            var _sharedKey = function (key) {
-              return shared[key] || (shared[key] = _uid(key));
-            };
-
-            var arrayIndexOf$1 = _arrayIncludes(false);
-            var IE_PROTO = _sharedKey('IE_PROTO');
-
-            var _objectKeysInternal = function (object, names) {
-              var O = _toIobject(object);
-              var i = 0;
-              var result = [];
-              var key;
-              for (key in O) if (key != IE_PROTO) _has(O, key) && result.push(key);
-              // Don't enum bug & hidden keys
-              while (names.length > i) if (_has(O, key = names[i++])) {
-                ~arrayIndexOf$1(result, key) || result.push(key);
-              }
-              return result;
-            };
-
-            // IE 8- don't enum bug keys
-            var _enumBugKeys = (
-              'constructor,hasOwnProperty,isPrototypeOf,propertyIsEnumerable,toLocaleString,toString,valueOf'
-            ).split(',');
-
-            // 19.1.2.7 / 15.2.3.4 Object.getOwnPropertyNames(O)
-
-            var hiddenKeys = _enumBugKeys.concat('length', 'prototype');
-
-            var f$3 = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {
-              return _objectKeysInternal(O, hiddenKeys);
-            };
-
-            var _objectGopn = {
-            	f: f$3
-            };
-
-            var _stringWs = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003' +
-              '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
-
-            var space = '[' + _stringWs + ']';
-            var non = '\u200b\u0085';
-            var ltrim = RegExp('^' + space + space + '*');
-            var rtrim = RegExp(space + space + '*$');
-
-            var exporter = function (KEY, exec, ALIAS) {
-              var exp = {};
-              var FORCE = _fails(function () {
-                return !!_stringWs[KEY]() || non[KEY]() != non;
-              });
-              var fn = exp[KEY] = FORCE ? exec(trim) : _stringWs[KEY];
-              if (ALIAS) exp[ALIAS] = fn;
-              _export(_export.P + _export.F * FORCE, 'String', exp);
-            };
-
-            // 1 -> String#trimLeft
-            // 2 -> String#trimRight
-            // 3 -> String#trim
-            var trim = exporter.trim = function (string, TYPE) {
-              string = String(_defined(string));
-              if (TYPE & 1) string = string.replace(ltrim, '');
-              if (TYPE & 2) string = string.replace(rtrim, '');
-              return string;
-            };
-
-            var _stringTrim = exporter;
-
-            // 19.1.2.14 / 15.2.3.14 Object.keys(O)
-
-
-
-            var _objectKeys = Object.keys || function keys(O) {
-              return _objectKeysInternal(O, _enumBugKeys);
-            };
-
-            var _objectDps = _descriptors ? Object.defineProperties : function defineProperties(O, Properties) {
-              _anObject(O);
-              var keys = _objectKeys(Properties);
-              var length = keys.length;
-              var i = 0;
-              var P;
-              while (length > i) _objectDp.f(O, P = keys[i++], Properties[P]);
-              return O;
-            };
-
-            var document$1 = _global.document;
-            var _html = document$1 && document$1.documentElement;
-
-            // 19.1.2.2 / 15.2.3.5 Object.create(O [, Properties])
-
-
-
-            var IE_PROTO$1 = _sharedKey('IE_PROTO');
-            var Empty = function () { /* empty */ };
-            var PROTOTYPE$1 = 'prototype';
-
-            // Create object with fake `null` prototype: use iframe Object with cleared prototype
-            var createDict = function () {
-              // Thrash, waste and sodomy: IE GC bug
-              var iframe = _domCreate('iframe');
-              var i = _enumBugKeys.length;
-              var lt = '<';
-              var gt = '>';
-              var iframeDocument;
-              iframe.style.display = 'none';
-              _html.appendChild(iframe);
-              iframe.src = 'javascript:'; // eslint-disable-line no-script-url
-              // createDict = iframe.contentWindow.Object;
-              // html.removeChild(iframe);
-              iframeDocument = iframe.contentWindow.document;
-              iframeDocument.open();
-              iframeDocument.write(lt + 'script' + gt + 'document.F=Object' + lt + '/script' + gt);
-              iframeDocument.close();
-              createDict = iframeDocument.F;
-              while (i--) delete createDict[PROTOTYPE$1][_enumBugKeys[i]];
-              return createDict();
-            };
-
-            var _objectCreate = Object.create || function create(O, Properties) {
-              var result;
-              if (O !== null) {
-                Empty[PROTOTYPE$1] = _anObject(O);
-                result = new Empty();
-                Empty[PROTOTYPE$1] = null;
-                // add "__proto__" for Object.getPrototypeOf polyfill
-                result[IE_PROTO$1] = O;
-              } else result = createDict();
-              return Properties === undefined ? result : _objectDps(result, Properties);
-            };
-
-            var gOPN = _objectGopn.f;
-            var gOPD$1 = _objectGopd.f;
-            var dP$2 = _objectDp.f;
-            var $trim = _stringTrim.trim;
-            var NUMBER = 'Number';
-            var $Number = _global[NUMBER];
-            var Base = $Number;
-            var proto = $Number.prototype;
-            // Opera ~12 has broken Object#toString
-            var BROKEN_COF = _cof(_objectCreate(proto)) == NUMBER;
-            var TRIM = 'trim' in String.prototype;
-
-            // 7.1.3 ToNumber(argument)
-            var toNumber = function (argument) {
-              var it = _toPrimitive(argument, false);
-              if (typeof it == 'string' && it.length > 2) {
-                it = TRIM ? it.trim() : $trim(it, 3);
-                var first = it.charCodeAt(0);
-                var third, radix, maxCode;
-                if (first === 43 || first === 45) {
-                  third = it.charCodeAt(2);
-                  if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix
-                } else if (first === 48) {
-                  switch (it.charCodeAt(1)) {
-                    case 66: case 98: radix = 2; maxCode = 49; break; // fast equal /^0b[01]+$/i
-                    case 79: case 111: radix = 8; maxCode = 55; break; // fast equal /^0o[0-7]+$/i
-                    default: return +it;
-                  }
-                  for (var digits = it.slice(2), i = 0, l = digits.length, code; i < l; i++) {
-                    code = digits.charCodeAt(i);
-                    // parseInt parses a string to a first unavailable symbol
-                    // but ToNumber should return NaN if a string contains unavailable symbols
-                    if (code < 48 || code > maxCode) return NaN;
-                  } return parseInt(digits, radix);
-                }
-              } return +it;
-            };
-
-            if (!$Number(' 0o1') || !$Number('0b1') || $Number('+0x1')) {
-              $Number = function Number(value) {
-                var it = arguments.length < 1 ? 0 : value;
-                var that = this;
-                return that instanceof $Number
-                  // check on 1..constructor(foo) case
-                  && (BROKEN_COF ? _fails(function () { proto.valueOf.call(that); }) : _cof(that) != NUMBER)
-                    ? _inheritIfRequired(new Base(toNumber(it)), that, $Number) : toNumber(it);
-              };
-              for (var keys = _descriptors ? gOPN(Base) : (
-                // ES3:
-                'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +
-                // ES6 (in case, if modules with ES6 Number statics required before):
-                'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +
-                'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger'
-              ).split(','), j = 0, key; keys.length > j; j++) {
-                if (_has(Base, key = keys[j]) && !_has($Number, key)) {
-                  dP$2($Number, key, gOPD$1(Base, key));
-                }
-              }
-              $Number.prototype = proto;
-              proto.constructor = $Number;
-              _redefine(_global, NUMBER, $Number);
-            }
-
-            // 21.2.5.3 get RegExp.prototype.flags
-
-            var _flags = function () {
-              var that = _anObject(this);
-              var result = '';
-              if (that.global) result += 'g';
-              if (that.ignoreCase) result += 'i';
-              if (that.multiline) result += 'm';
-              if (that.unicode) result += 'u';
-              if (that.sticky) result += 'y';
-              return result;
-            };
-
-            // 21.2.5.3 get RegExp.prototype.flags()
-            if (_descriptors && /./g.flags != 'g') _objectDp.f(RegExp.prototype, 'flags', {
-              configurable: true,
-              get: _flags
-            });
-
-            var TO_STRING = 'toString';
-            var $toString = /./[TO_STRING];
-
-            var define = function (fn) {
-              _redefine(RegExp.prototype, TO_STRING, fn, true);
-            };
-
-            // 21.2.5.14 RegExp.prototype.toString()
-            if (_fails(function () { return $toString.call({ source: 'a', flags: 'b' }) != '/a/b'; })) {
-              define(function toString() {
-                var R = _anObject(this);
-                return '/'.concat(R.source, '/',
-                  'flags' in R ? R.flags : !_descriptors && R instanceof RegExp ? _flags.call(R) : undefined);
-              });
-            // FF44- RegExp#toString has a wrong name
-            } else if ($toString.name != TO_STRING) {
-              define(function toString() {
-                return $toString.call(this);
-              });
-            }
-
-            // 7.1.13 ToObject(argument)
-
-            var _toObject = function (it) {
-              return Object(_defined(it));
-            };
-
-            // call something on iterator step with safe closing on error
-
-            var _iterCall = function (iterator, fn, value, entries) {
-              try {
-                return entries ? fn(_anObject(value)[0], value[1]) : fn(value);
-              // 7.4.6 IteratorClose(iterator, completion)
-              } catch (e) {
-                var ret = iterator['return'];
-                if (ret !== undefined) _anObject(ret.call(iterator));
-                throw e;
-              }
-            };
-
-            var _iterators = {};
-
-            var _wks = createCommonjsModule(function (module) {
-            var store = _shared('wks');
-
-            var Symbol = _global.Symbol;
-            var USE_SYMBOL = typeof Symbol == 'function';
-
-            var $exports = module.exports = function (name) {
-              return store[name] || (store[name] =
-                USE_SYMBOL && Symbol[name] || (USE_SYMBOL ? Symbol : _uid)('Symbol.' + name));
-            };
-
-            $exports.store = store;
-            });
-
-            // check on default Array iterator
-
-            var ITERATOR = _wks('iterator');
-            var ArrayProto = Array.prototype;
-
-            var _isArrayIter = function (it) {
-              return it !== undefined && (_iterators.Array === it || ArrayProto[ITERATOR] === it);
-            };
-
-            var _createProperty = function (object, index, value) {
-              if (index in object) _objectDp.f(object, index, _propertyDesc(0, value));
-              else object[index] = value;
-            };
-
-            // getting tag from 19.1.3.6 Object.prototype.toString()
-
-            var TAG = _wks('toStringTag');
-            // ES3 wrong here
-            var ARG = _cof(function () { return arguments; }()) == 'Arguments';
-
-            // fallback for IE11 Script Access Denied error
-            var tryGet = function (it, key) {
-              try {
-                return it[key];
-              } catch (e) { /* empty */ }
-            };
-
-            var _classof = function (it) {
-              var O, T, B;
-              return it === undefined ? 'Undefined' : it === null ? 'Null'
-                // @@toStringTag case
-                : typeof (T = tryGet(O = Object(it), TAG)) == 'string' ? T
-                // builtinTag case
-                : ARG ? _cof(O)
-                // ES3 arguments fallback
-                : (B = _cof(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : B;
-            };
-
-            var ITERATOR$1 = _wks('iterator');
-
-            var core_getIteratorMethod = _core.getIteratorMethod = function (it) {
-              if (it != undefined) return it[ITERATOR$1]
-                || it['@@iterator']
-                || _iterators[_classof(it)];
-            };
-
-            var ITERATOR$2 = _wks('iterator');
-            var SAFE_CLOSING = false;
-
-            try {
-              var riter = [7][ITERATOR$2]();
-              riter['return'] = function () { SAFE_CLOSING = true; };
-            } catch (e) { /* empty */ }
-
-            var _iterDetect = function (exec, skipClosing) {
-              if (!skipClosing && !SAFE_CLOSING) return false;
-              var safe = false;
-              try {
-                var arr = [7];
-                var iter = arr[ITERATOR$2]();
-                iter.next = function () { return { done: safe = true }; };
-                arr[ITERATOR$2] = function () { return iter; };
-                exec(arr);
-              } catch (e) { /* empty */ }
-              return safe;
-            };
-
-            _export(_export.S + _export.F * !_iterDetect(function (iter) { }), 'Array', {
-              // 22.1.2.1 Array.from(arrayLike, mapfn = undefined, thisArg = undefined)
-              from: function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {
-                var O = _toObject(arrayLike);
-                var C = typeof this == 'function' ? this : Array;
-                var aLen = arguments.length;
-                var mapfn = aLen > 1 ? arguments[1] : undefined;
-                var mapping = mapfn !== undefined;
-                var index = 0;
-                var iterFn = core_getIteratorMethod(O);
-                var length, result, step, iterator;
-                if (mapping) mapfn = _ctx(mapfn, aLen > 2 ? arguments[2] : undefined, 2);
-                // if object isn't iterable or it's array with default iterator - use simple case
-                if (iterFn != undefined && !(C == Array && _isArrayIter(iterFn))) {
-                  for (iterator = iterFn.call(O), result = new C(); !(step = iterator.next()).done; index++) {
-                    _createProperty(result, index, mapping ? _iterCall(iterator, mapfn, [step.value, index], true) : step.value);
-                  }
-                } else {
-                  length = _toLength(O.length);
-                  for (result = new C(length); length > index; index++) {
-                    _createProperty(result, index, mapping ? mapfn(O[index], index) : O[index]);
-                  }
-                }
-                result.length = index;
-                return result;
-              }
-            });
-
-            // 20.2.2.22 Math.log2(x)
-
-
-            _export(_export.S, 'Math', {
-              log2: function log2(x) {
-                return Math.log(x) / Math.LN2;
-              }
-            });
-
-            var Tools =
-            /*#__PURE__*/
-            function () {
-              function Tools() {
-                _classCallCheck(this, Tools);
-              }
-
-              _createClass(Tools, null, [{
-                key: "readVint",
-
-                /**
-                 * read variable length integer per
-                 * https://www.matroska.org/technical/specs/index.html#EBML_ex
-                 * @param {Buffer} buffer containing input
-                 * @param {Number} [start=0] position in buffer
-                 * @returns {{length: Number, value: number}}  value / length object
-                 */
-                value: function readVint(buffer) {
-                  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
-                  var length = 8 - Math.floor(Math.log2(buffer[start]));
-
-                  if (length > 8) {
-                    var number = Tools.readHexString(buffer, start, start + length);
-                    throw new Error("Unrepresentable length: ".concat(length, " ").concat(number));
-                  }
-
-                  if (start + length > buffer.length) {
-                    return null;
-                  }
-
-                  var value = buffer[start] & (1 << 8 - length) - 1;
-
-                  for (var i = 1; i < length; i += 1) {
-                    if (i === 7) {
-                      if (value >= Math.pow(2, 8) && buffer[start + 7] > 0) {
-                        return {
-                          length: length,
-                          value: -1
-                        };
-                      }
-                    }
-
-                    value *= Math.pow(2, 8);
-                    value += buffer[start + i];
-                  }
-
-                  return {
-                    length: length,
-                    value: value
-                  };
-                }
-                /**
-                 * write variable length integer
-                 * @param {Number} value to store into buffer
-                 * @returns {Buffer} containing the value
-                 */
-
-              }, {
-                key: "writeVint",
-                value: function writeVint(value) {
-                  if (value < 0 || value > Math.pow(2, 53)) {
-                    throw new Error("Unrepresentable value: ".concat(value));
-                  }
-
-                  var length = 1;
-
-                  for (length = 1; length <= 8; length += 1) {
-                    if (value < Math.pow(2, 7 * length) - 1) {
-                      break;
-                    }
-                  }
-
-                  var buffer = Buffer.alloc(length);
-                  var val = value;
-
-                  for (var i = 1; i <= length; i += 1) {
-                    var b = val & 0xff;
-                    buffer[length - i] = b;
-                    val -= b;
-                    val /= Math.pow(2, 8);
-                  }
-
-                  buffer[0] |= 1 << 8 - length;
-                  return buffer;
-                }
-                /**
-                 * *
-                 * concatenate two arrays of bytes
-                 * @param {Buffer} a1  First array
-                 * @param {Buffer} a2  Second array
-                 * @returns  {Buffer} concatenated arrays
-                 */
-
-              }, {
-                key: "concatenate",
-                value: function concatenate(a1, a2) {
-                  if (!a1 || a1.byteLength === 0) {
-                    return a2;
-                  }
-
-                  if (!a2 || a2.byteLength === 0) {
-                    return a1;
-                  }
-
-                  return Buffer.from(_toConsumableArray(a1).concat(_toConsumableArray(a2)));
-                }
-                /**
-                 * get a hex text string from Buff[start,end)
-                 * @param {Buffer} buff from which to read the string
-                 * @param {Number} [start=0] starting point (default 0)
-                 * @param {Number} [end=buff.byteLength] ending point (default the whole buffer)
-                 * @returns {string} the hex string
-                 */
-
-              }, {
-                key: "readHexString",
-                value: function readHexString(buff) {
-                  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
-                  var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : buff.byteLength;
-                  return Array.from(buff.slice(start, end)).map(function (q) {
-                    return Number(q).toString(16);
-                  }).reduce(function (acc, current) {
-                    return "".concat(acc).concat(current.padStart(2, '0'));
-                  }, '');
-                }
-                /**
-                 * tries to read out a UTF-8 encoded string
-                 * @param  {Buffer} buff the buffer to attempt to read from
-                 * @return {string|null}      the decoded text, or null if unable to
-                 */
-
-              }, {
-                key: "readUtf8",
-                value: function readUtf8(buff) {
-                  try {
-                    return Buffer.from(buff).toString('utf8');
-                  } catch (exception) {
-                    return null;
-                  }
-                }
-                /**
-                 * get an unsigned number from a buffer
-                 * @param {Buffer} buff from which to read variable-length unsigned number
-                 * @returns {number|string} result (in hex for lengths > 6)
-                 */
-
-              }, {
-                key: "readUnsigned",
-                value: function readUnsigned(buff) {
-                  var b = new DataView(buff.buffer, buff.byteOffset, buff.byteLength);
-
-                  switch (buff.byteLength) {
-                    case 1:
-                      return b.getUint8(0);
-
-                    case 2:
-                      return b.getUint16(0);
-
-                    case 4:
-                      return b.getUint32(0);
-
-                    default:
-                      break;
-                  }
-
-                  if (buff.byteLength <= 6) {
-                    return buff.reduce(function (acc, current) {
-                      return acc * 256 + current;
-                    }, 0);
-                  }
-
-                  return Tools.readHexString(buff, 0, buff.byteLength);
-                }
-                /**
-                 * get an signed number from a buffer
-                 * @static
-                 * @param {Buffer} buff from which to read variable-length signed number
-                 * @returns {number} result
-                 */
-
-              }, {
-                key: "readSigned",
-                value: function readSigned(buff) {
-                  var b = new DataView(buff.buffer, buff.byteOffset, buff.byteLength);
-
-                  switch (buff.byteLength) {
-                    case 1:
-                      return b.getInt8(0);
-
-                    case 2:
-                      return b.getInt16(0);
-
-                    case 4:
-                      return b.getInt32(0);
-
-                    default:
-                      return NaN;
-                  }
-                }
-                /**
-                 * get an floating-point number from a buffer
-                 * @static
-                 * @param {Buffer} buff from which to read variable-length floating-point number
-                 * @returns {number} result
-                 */
-
-              }, {
-                key: "readFloat",
-                value: function readFloat(buff) {
-                  var b = new DataView(buff.buffer, buff.byteOffset, buff.byteLength);
-
-                  switch (buff.byteLength) {
-                    case 4:
-                      return b.getFloat32(0);
-
-                    case 8:
-                      return b.getFloat64(0);
-
-                    default:
-                      return NaN;
-                  }
-                }
-                /**
-                 * Reads the data from a tag
-                 * @static
-                 * @param  {TagData} tagObj The tag object to be read
-                 * @param  {Buffer} data Data to be transformed
-                 * @return {Tag} result
-                 */
-
-              }, {
-                key: "readDataFromTag",
-                value: function readDataFromTag(tagObj, data) {
-                  var type = tagObj.type,
-                      name = tagObj.name;
-                  var track = tagObj.track;
-                  var discardable = tagObj.discardable || false;
-                  var keyframe = tagObj.keyframe || false;
-                  var payload = null;
-                  var value;
-
-                  switch (type) {
-                    case 'u':
-                      value = Tools.readUnsigned(data);
-                      break;
-
-                    case 'f':
-                      value = Tools.readFloat(data);
-                      break;
-
-                    case 'i':
-                      value = Tools.readSigned(data);
-                      break;
-
-                    case 's':
-                      value = String.fromCharCode.apply(String, _toConsumableArray(data));
-                      break;
-
-                    case '8':
-                      value = Tools.readUtf8(data);
-                      break;
-
-                    default:
-                      break;
-                  }
-
-                  if (name === 'SimpleBlock' || name === 'Block') {
-                    var p = 0;
-
-                    var _Tools$readVint = Tools.readVint(data, p),
-                        length = _Tools$readVint.length,
-                        trak = _Tools$readVint.value;
-
-                    p += length;
-                    track = trak;
-                    value = Tools.readSigned(data.subarray(p, p + 2));
-                    p += 2;
-
-                    if (name === 'SimpleBlock') {
-                      keyframe = Boolean(data[length + 2] & 0x80);
-                      discardable = Boolean(data[length + 2] & 0x01);
-                    }
-
-                    p += 1;
-                    payload = data.subarray(p);
-                  }
-
-                  return _objectSpread({}, tagObj, {
-                    data: data,
-                    discardable: discardable,
-                    keyframe: keyframe,
-                    payload: payload,
-                    track: track,
-                    value: value
-                  });
-                }
-              }]);
-
-              return Tools;
-            }();
-
-            // 22.1.3.31 Array.prototype[@@unscopables]
-            var UNSCOPABLES = _wks('unscopables');
-            var ArrayProto$1 = Array.prototype;
-            if (ArrayProto$1[UNSCOPABLES] == undefined) _hide(ArrayProto$1, UNSCOPABLES, {});
-            var _addToUnscopables = function (key) {
-              ArrayProto$1[UNSCOPABLES][key] = true;
-            };
-
-            var _iterStep = function (done, value) {
-              return { value: value, done: !!done };
-            };
-
-            var def = _objectDp.f;
-
-            var TAG$1 = _wks('toStringTag');
-
-            var _setToStringTag = function (it, tag, stat) {
-              if (it && !_has(it = stat ? it : it.prototype, TAG$1)) def(it, TAG$1, { configurable: true, value: tag });
-            };
-
-            var IteratorPrototype = {};
-
-            // 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
-            _hide(IteratorPrototype, _wks('iterator'), function () { return this; });
-
-            var _iterCreate = function (Constructor, NAME, next) {
-              Constructor.prototype = _objectCreate(IteratorPrototype, { next: _propertyDesc(1, next) });
-              _setToStringTag(Constructor, NAME + ' Iterator');
-            };
-
-            // 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)
-
-
-            var IE_PROTO$2 = _sharedKey('IE_PROTO');
-            var ObjectProto = Object.prototype;
-
-            var _objectGpo = Object.getPrototypeOf || function (O) {
-              O = _toObject(O);
-              if (_has(O, IE_PROTO$2)) return O[IE_PROTO$2];
-              if (typeof O.constructor == 'function' && O instanceof O.constructor) {
-                return O.constructor.prototype;
-              } return O instanceof Object ? ObjectProto : null;
-            };
-
-            var ITERATOR$3 = _wks('iterator');
-            var BUGGY = !([].keys && 'next' in [].keys()); // Safari has buggy iterators w/o `next`
-            var FF_ITERATOR = '@@iterator';
-            var KEYS = 'keys';
-            var VALUES = 'values';
-
-            var returnThis = function () { return this; };
-
-            var _iterDefine = function (Base, NAME, Constructor, next, DEFAULT, IS_SET, FORCED) {
-              _iterCreate(Constructor, NAME, next);
-              var getMethod = function (kind) {
-                if (!BUGGY && kind in proto) return proto[kind];
-                switch (kind) {
-                  case KEYS: return function keys() { return new Constructor(this, kind); };
-                  case VALUES: return function values() { return new Constructor(this, kind); };
-                } return function entries() { return new Constructor(this, kind); };
-              };
-              var TAG = NAME + ' Iterator';
-              var DEF_VALUES = DEFAULT == VALUES;
-              var VALUES_BUG = false;
-              var proto = Base.prototype;
-              var $native = proto[ITERATOR$3] || proto[FF_ITERATOR] || DEFAULT && proto[DEFAULT];
-              var $default = $native || getMethod(DEFAULT);
-              var $entries = DEFAULT ? !DEF_VALUES ? $default : getMethod('entries') : undefined;
-              var $anyNative = NAME == 'Array' ? proto.entries || $native : $native;
-              var methods, key, IteratorPrototype;
-              // Fix native
-              if ($anyNative) {
-                IteratorPrototype = _objectGpo($anyNative.call(new Base()));
-                if (IteratorPrototype !== Object.prototype && IteratorPrototype.next) {
-                  // Set @@toStringTag to native iterators
-                  _setToStringTag(IteratorPrototype, TAG, true);
-                  // fix for some old engines
-                  if (!_library && typeof IteratorPrototype[ITERATOR$3] != 'function') _hide(IteratorPrototype, ITERATOR$3, returnThis);
-                }
-              }
-              // fix Array#{values, @@iterator}.name in V8 / FF
-              if (DEF_VALUES && $native && $native.name !== VALUES) {
-                VALUES_BUG = true;
-                $default = function values() { return $native.call(this); };
-              }
-              // Define iterator
-              if ((!_library || FORCED) && (BUGGY || VALUES_BUG || !proto[ITERATOR$3])) {
-                _hide(proto, ITERATOR$3, $default);
-              }
-              // Plug for library
-              _iterators[NAME] = $default;
-              _iterators[TAG] = returnThis;
-              if (DEFAULT) {
-                methods = {
-                  values: DEF_VALUES ? $default : getMethod(VALUES),
-                  keys: IS_SET ? $default : getMethod(KEYS),
-                  entries: $entries
-                };
-                if (FORCED) for (key in methods) {
-                  if (!(key in proto)) _redefine(proto, key, methods[key]);
-                } else _export(_export.P + _export.F * (BUGGY || VALUES_BUG), NAME, methods);
-              }
-              return methods;
-            };
-
-            // 22.1.3.4 Array.prototype.entries()
-            // 22.1.3.13 Array.prototype.keys()
-            // 22.1.3.29 Array.prototype.values()
-            // 22.1.3.30 Array.prototype[@@iterator]()
-            var es6_array_iterator = _iterDefine(Array, 'Array', function (iterated, kind) {
-              this._t = _toIobject(iterated); // target
-              this._i = 0;                   // next index
-              this._k = kind;                // kind
-            // 22.1.5.2.1 %ArrayIteratorPrototype%.next()
-            }, function () {
-              var O = this._t;
-              var kind = this._k;
-              var index = this._i++;
-              if (!O || index >= O.length) {
-                this._t = undefined;
-                return _iterStep(1);
-              }
-              if (kind == 'keys') return _iterStep(0, index);
-              if (kind == 'values') return _iterStep(0, O[index]);
-              return _iterStep(0, [index, O[index]]);
-            }, 'values');
-
-            // argumentsList[@@iterator] is %ArrayProto_values% (9.4.4.6, 9.4.4.7)
-            _iterators.Arguments = _iterators.Array;
-
-            _addToUnscopables('keys');
-            _addToUnscopables('values');
-            _addToUnscopables('entries');
-
-            var ITERATOR$4 = _wks('iterator');
-            var TO_STRING_TAG = _wks('toStringTag');
-            var ArrayValues = _iterators.Array;
-
-            var DOMIterables = {
-              CSSRuleList: true, // TODO: Not spec compliant, should be false.
-              CSSStyleDeclaration: false,
-              CSSValueList: false,
-              ClientRectList: false,
-              DOMRectList: false,
-              DOMStringList: false,
-              DOMTokenList: true,
-              DataTransferItemList: false,
-              FileList: false,
-              HTMLAllCollection: false,
-              HTMLCollection: false,
-              HTMLFormElement: false,
-              HTMLSelectElement: false,
-              MediaList: true, // TODO: Not spec compliant, should be false.
-              MimeTypeArray: false,
-              NamedNodeMap: false,
-              NodeList: true,
-              PaintRequestList: false,
-              Plugin: false,
-              PluginArray: false,
-              SVGLengthList: false,
-              SVGNumberList: false,
-              SVGPathSegList: false,
-              SVGPointList: false,
-              SVGStringList: false,
-              SVGTransformList: false,
-              SourceBufferList: false,
-              StyleSheetList: true, // TODO: Not spec compliant, should be false.
-              TextTrackCueList: false,
-              TextTrackList: false,
-              TouchList: false
-            };
-
-            for (var collections = _objectKeys(DOMIterables), i = 0; i < collections.length; i++) {
-              var NAME$1 = collections[i];
-              var explicit = DOMIterables[NAME$1];
-              var Collection = _global[NAME$1];
-              var proto$1 = Collection && Collection.prototype;
-              var key$1;
-              if (proto$1) {
-                if (!proto$1[ITERATOR$4]) _hide(proto$1, ITERATOR$4, ArrayValues);
-                if (!proto$1[TO_STRING_TAG]) _hide(proto$1, TO_STRING_TAG, NAME$1);
-                _iterators[NAME$1] = ArrayValues;
-                if (explicit) for (key$1 in es6_array_iterator) if (!proto$1[key$1]) _redefine(proto$1, key$1, es6_array_iterator[key$1], true);
-              }
-            }
-
-            var _redefineAll = function (target, src, safe) {
-              for (var key in src) _redefine(target, key, src[key], safe);
-              return target;
-            };
-
-            var _anInstance = function (it, Constructor, name, forbiddenField) {
-              if (!(it instanceof Constructor) || (forbiddenField !== undefined && forbiddenField in it)) {
-                throw TypeError(name + ': incorrect invocation!');
-              } return it;
-            };
-
-            var _forOf = createCommonjsModule(function (module) {
-            var BREAK = {};
-            var RETURN = {};
-            var exports = module.exports = function (iterable, entries, fn, that, ITERATOR) {
-              var iterFn = ITERATOR ? function () { return iterable; } : core_getIteratorMethod(iterable);
-              var f = _ctx(fn, that, entries ? 2 : 1);
-              var index = 0;
-              var length, step, iterator, result;
-              if (typeof iterFn != 'function') throw TypeError(iterable + ' is not iterable!');
-              // fast case for arrays with default iterator
-              if (_isArrayIter(iterFn)) for (length = _toLength(iterable.length); length > index; index++) {
-                result = entries ? f(_anObject(step = iterable[index])[0], step[1]) : f(iterable[index]);
-                if (result === BREAK || result === RETURN) return result;
-              } else for (iterator = iterFn.call(iterable); !(step = iterator.next()).done;) {
-                result = _iterCall(iterator, f, step.value, entries);
-                if (result === BREAK || result === RETURN) return result;
-              }
-            };
-            exports.BREAK = BREAK;
-            exports.RETURN = RETURN;
-            });
-
-            var SPECIES = _wks('species');
-
-            var _setSpecies = function (KEY) {
-              var C = _global[KEY];
-              if (_descriptors && C && !C[SPECIES]) _objectDp.f(C, SPECIES, {
-                configurable: true,
-                get: function () { return this; }
-              });
-            };
-
-            var _meta = createCommonjsModule(function (module) {
-            var META = _uid('meta');
-
-
-            var setDesc = _objectDp.f;
-            var id = 0;
-            var isExtensible = Object.isExtensible || function () {
-              return true;
-            };
-            var FREEZE = !_fails(function () {
-              return isExtensible(Object.preventExtensions({}));
-            });
-            var setMeta = function (it) {
-              setDesc(it, META, { value: {
-                i: 'O' + ++id, // object ID
-                w: {}          // weak collections IDs
-              } });
-            };
-            var fastKey = function (it, create) {
-              // return primitive with prefix
-              if (!_isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
-              if (!_has(it, META)) {
-                // can't set metadata to uncaught frozen object
-                if (!isExtensible(it)) return 'F';
-                // not necessary to add metadata
-                if (!create) return 'E';
-                // add missing metadata
-                setMeta(it);
-              // return object ID
-              } return it[META].i;
-            };
-            var getWeak = function (it, create) {
-              if (!_has(it, META)) {
-                // can't set metadata to uncaught frozen object
-                if (!isExtensible(it)) return true;
-                // not necessary to add metadata
-                if (!create) return false;
-                // add missing metadata
-                setMeta(it);
-              // return hash weak collections IDs
-              } return it[META].w;
-            };
-            // add metadata on freeze-family methods calling
-            var onFreeze = function (it) {
-              if (FREEZE && meta.NEED && isExtensible(it) && !_has(it, META)) setMeta(it);
-              return it;
-            };
-            var meta = module.exports = {
-              KEY: META,
-              NEED: false,
-              fastKey: fastKey,
-              getWeak: getWeak,
-              onFreeze: onFreeze
-            };
-            });
-            var _meta_1 = _meta.KEY;
-            var _meta_2 = _meta.NEED;
-            var _meta_3 = _meta.fastKey;
-            var _meta_4 = _meta.getWeak;
-            var _meta_5 = _meta.onFreeze;
-
-            var _validateCollection = function (it, TYPE) {
-              if (!_isObject(it) || it._t !== TYPE) throw TypeError('Incompatible receiver, ' + TYPE + ' required!');
-              return it;
-            };
-
-            var dP$3 = _objectDp.f;
-
-
-
-
-
-
-
-
-
-            var fastKey = _meta.fastKey;
-
-            var SIZE = _descriptors ? '_s' : 'size';
-
-            var getEntry = function (that, key) {
-              // fast case
-              var index = fastKey(key);
-              var entry;
-              if (index !== 'F') return that._i[index];
-              // frozen object case
-              for (entry = that._f; entry; entry = entry.n) {
-                if (entry.k == key) return entry;
-              }
-            };
-
-            var _collectionStrong = {
-              getConstructor: function (wrapper, NAME, IS_MAP, ADDER) {
-                var C = wrapper(function (that, iterable) {
-                  _anInstance(that, C, NAME, '_i');
-                  that._t = NAME;         // collection type
-                  that._i = _objectCreate(null); // index
-                  that._f = undefined;    // first entry
-                  that._l = undefined;    // last entry
-                  that[SIZE] = 0;         // size
-                  if (iterable != undefined) _forOf(iterable, IS_MAP, that[ADDER], that);
-                });
-                _redefineAll(C.prototype, {
-                  // 23.1.3.1 Map.prototype.clear()
-                  // 23.2.3.2 Set.prototype.clear()
-                  clear: function clear() {
-                    for (var that = _validateCollection(this, NAME), data = that._i, entry = that._f; entry; entry = entry.n) {
-                      entry.r = true;
-                      if (entry.p) entry.p = entry.p.n = undefined;
-                      delete data[entry.i];
-                    }
-                    that._f = that._l = undefined;
-                    that[SIZE] = 0;
-                  },
-                  // 23.1.3.3 Map.prototype.delete(key)
-                  // 23.2.3.4 Set.prototype.delete(value)
-                  'delete': function (key) {
-                    var that = _validateCollection(this, NAME);
-                    var entry = getEntry(that, key);
-                    if (entry) {
-                      var next = entry.n;
-                      var prev = entry.p;
-                      delete that._i[entry.i];
-                      entry.r = true;
-                      if (prev) prev.n = next;
-                      if (next) next.p = prev;
-                      if (that._f == entry) that._f = next;
-                      if (that._l == entry) that._l = prev;
-                      that[SIZE]--;
-                    } return !!entry;
-                  },
-                  // 23.2.3.6 Set.prototype.forEach(callbackfn, thisArg = undefined)
-                  // 23.1.3.5 Map.prototype.forEach(callbackfn, thisArg = undefined)
-                  forEach: function forEach(callbackfn /* , that = undefined */) {
-                    _validateCollection(this, NAME);
-                    var f = _ctx(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
-                    var entry;
-                    while (entry = entry ? entry.n : this._f) {
-                      f(entry.v, entry.k, this);
-                      // revert to the last existing entry
-                      while (entry && entry.r) entry = entry.p;
-                    }
-                  },
-                  // 23.1.3.7 Map.prototype.has(key)
-                  // 23.2.3.7 Set.prototype.has(value)
-                  has: function has(key) {
-                    return !!getEntry(_validateCollection(this, NAME), key);
-                  }
-                });
-                if (_descriptors) dP$3(C.prototype, 'size', {
-                  get: function () {
-                    return _validateCollection(this, NAME)[SIZE];
-                  }
-                });
-                return C;
-              },
-              def: function (that, key, value) {
-                var entry = getEntry(that, key);
-                var prev, index;
-                // change existing entry
-                if (entry) {
-                  entry.v = value;
-                // create new entry
-                } else {
-                  that._l = entry = {
-                    i: index = fastKey(key, true), // <- index
-                    k: key,                        // <- key
-                    v: value,                      // <- value
-                    p: prev = that._l,             // <- previous entry
-                    n: undefined,                  // <- next entry
-                    r: false                       // <- removed
-                  };
-                  if (!that._f) that._f = entry;
-                  if (prev) prev.n = entry;
-                  that[SIZE]++;
-                  // add to index
-                  if (index !== 'F') that._i[index] = entry;
-                } return that;
-              },
-              getEntry: getEntry,
-              setStrong: function (C, NAME, IS_MAP) {
-                // add .keys, .values, .entries, [@@iterator]
-                // 23.1.3.4, 23.1.3.8, 23.1.3.11, 23.1.3.12, 23.2.3.5, 23.2.3.8, 23.2.3.10, 23.2.3.11
-                _iterDefine(C, NAME, function (iterated, kind) {
-                  this._t = _validateCollection(iterated, NAME); // target
-                  this._k = kind;                     // kind
-                  this._l = undefined;                // previous
-                }, function () {
-                  var that = this;
-                  var kind = that._k;
-                  var entry = that._l;
-                  // revert to the last existing entry
-                  while (entry && entry.r) entry = entry.p;
-                  // get next entry
-                  if (!that._t || !(that._l = entry = entry ? entry.n : that._t._f)) {
-                    // or finish the iteration
-                    that._t = undefined;
-                    return _iterStep(1);
-                  }
-                  // return step by kind
-                  if (kind == 'keys') return _iterStep(0, entry.k);
-                  if (kind == 'values') return _iterStep(0, entry.v);
-                  return _iterStep(0, [entry.k, entry.v]);
-                }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);
-
-                // add [@@species], 23.1.2.2, 23.2.2.2
-                _setSpecies(NAME);
-              }
-            };
-
-            var _collection = function (NAME, wrapper, methods, common, IS_MAP, IS_WEAK) {
-              var Base = _global[NAME];
-              var C = Base;
-              var ADDER = IS_MAP ? 'set' : 'add';
-              var proto = C && C.prototype;
-              var O = {};
-              var fixMethod = function (KEY) {
-                var fn = proto[KEY];
-                _redefine(proto, KEY,
-                  KEY == 'delete' ? function (a) {
-                    return IS_WEAK && !_isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);
-                  } : KEY == 'has' ? function has(a) {
-                    return IS_WEAK && !_isObject(a) ? false : fn.call(this, a === 0 ? 0 : a);
-                  } : KEY == 'get' ? function get(a) {
-                    return IS_WEAK && !_isObject(a) ? undefined : fn.call(this, a === 0 ? 0 : a);
-                  } : KEY == 'add' ? function add(a) { fn.call(this, a === 0 ? 0 : a); return this; }
-                    : function set(a, b) { fn.call(this, a === 0 ? 0 : a, b); return this; }
-                );
-              };
-              if (typeof C != 'function' || !(IS_WEAK || proto.forEach && !_fails(function () {
-                new C().entries().next();
-              }))) {
-                // create collection constructor
-                C = common.getConstructor(wrapper, NAME, IS_MAP, ADDER);
-                _redefineAll(C.prototype, methods);
-                _meta.NEED = true;
-              } else {
-                var instance = new C();
-                // early implementations not supports chaining
-                var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;
-                // V8 ~  Chromium 40- weak-collections throws on primitives, but should return false
-                var THROWS_ON_PRIMITIVES = _fails(function () { instance.has(1); });
-                // most early implementations doesn't supports iterables, most modern - not close it correctly
-                var ACCEPT_ITERABLES = _iterDetect(function (iter) { new C(iter); }); // eslint-disable-line no-new
-                // for early implementations -0 and +0 not the same
-                var BUGGY_ZERO = !IS_WEAK && _fails(function () {
-                  // V8 ~ Chromium 42- fails only with 5+ elements
-                  var $instance = new C();
-                  var index = 5;
-                  while (index--) $instance[ADDER](index, index);
-                  return !$instance.has(-0);
-                });
-                if (!ACCEPT_ITERABLES) {
-                  C = wrapper(function (target, iterable) {
-                    _anInstance(target, C, NAME);
-                    var that = _inheritIfRequired(new Base(), target, C);
-                    if (iterable != undefined) _forOf(iterable, IS_MAP, that[ADDER], that);
-                    return that;
-                  });
-                  C.prototype = proto;
-                  proto.constructor = C;
-                }
-                if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
-                  fixMethod('delete');
-                  fixMethod('has');
-                  IS_MAP && fixMethod('get');
-                }
-                if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);
-                // weak collections should not contains .clear method
-                if (IS_WEAK && proto.clear) delete proto.clear;
-              }
-
-              _setToStringTag(C, NAME);
-
-              O[NAME] = C;
-              _export(_export.G + _export.W + _export.F * (C != Base), O);
-
-              if (!IS_WEAK) common.setStrong(C, NAME, IS_MAP);
-
-              return C;
-            };
-
-            var MAP = 'Map';
-
-            // 23.1 Map Objects
-            var es6_map = _collection(MAP, function (get) {
-              return function Map() { return get(this, arguments.length > 0 ? arguments[0] : undefined); };
-            }, {
-              // 23.1.3.6 Map.prototype.get(key)
-              get: function get(key) {
-                var entry = _collectionStrong.getEntry(_validateCollection(this, MAP), key);
-                return entry && entry.v;
-              },
-              // 23.1.3.9 Map.prototype.set(key, value)
-              set: function set(key, value) {
-                return _collectionStrong.def(_validateCollection(this, MAP), key === 0 ? 0 : key, value);
-              }
-            }, _collectionStrong, true);
-
-            var schema = new Map([[0x80, {
-              name: 'ChapterDisplay',
-              level: 4,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: true,
-              description: 'Contains all possible strings to use for the chapter display.'
-            }], [0x83, {
-              name: 'TrackType',
-              level: 3,
-              type: 'u',
-              multiple: false,
-              mandatory: true,
-              minver: 1,
-              range: '1-254',
-              description: 'A set of track types coded on 8 bits (1: video, 2: audio, 3: complex, 0x10: logo, 0x11: subtitle, 0x12: buttons, 0x20: control).',
-              webm: false
-            }], [0x85, {
-              name: 'ChapString',
-              cppname: 'ChapterString',
-              level: 5,
-              type: '8',
-              multiple: false,
-              mandatory: true,
-              minver: 1,
-              webm: true,
-              description: 'Contains the string to use as the chapter atom.'
-            }], [0x86, {
-              name: 'CodecID',
-              level: 3,
-              type: 's',
-              mandatory: true,
-              minver: 1,
-              description: 'An ID corresponding to the codec, see the codec page for more info.',
-              multiple: false,
-              webm: false
-            }], [0x88, {
-              name: 'FlagDefault',
-              cppname: 'TrackFlagDefault',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              default: 1,
-              range: '0-1',
-              description: 'Set if that track (audio, video or subs) SHOULD be active if no language found matches the user preference. (1 bit)',
-              multiple: false,
-              webm: false
-            }], [0x89, {
-              name: 'ChapterTrackNumber',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              description: 'UID of the Track to apply this chapter too. In the absense of a control track, choosing this chapter will select the listed Tracks and deselect unlisted tracks. Absense of this element indicates that the Chapter should be applied to any currently used Tracks.'
-            }], [0x91, {
-              name: 'ChapterTimeStart',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: true,
-              description: 'Timestamp of the start of Chapter (not scaled).',
-              multiple: false
-            }], [0x92, {
-              name: 'ChapterTimeEnd',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              description: 'Timestamp of the end of Chapter (timestamp excluded, not scaled).',
-              multiple: false
-            }], [0x96, {
-              name: 'CueRefTime',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 2,
-              webm: false,
-              description: 'Timestamp of the referenced Block.',
-              multiple: false
-            }], [0x97, {
-              name: 'CueRefCluster',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              webm: false,
-              description: 'The Position of the Cluster containing the referenced Block.',
-              minver: 0,
-              multiple: false
-            }], [0x98, {
-              name: 'ChapterFlagHidden',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              range: '0-1',
-              description: 'If a chapter is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)',
-              multiple: false
-            }], [0x4254, {
-              name: 'ContentCompAlgo',
-              level: 6,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              br: ['', '', '', ''],
-              del: ['1 - bzlib,', '2 - lzo1x'],
-              description: 'The compression algorithm used. Algorithms that have been specified so far are: 0 - zlib,   3 - Header Stripping',
-              multiple: false
-            }], [0x4255, {
-              name: 'ContentCompSettings',
-              level: 6,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'Settings that might be needed by the decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that were removed from the beggining of each frames of the track.',
-              multiple: false
-            }], [0x4282, {
-              name: 'DocType',
-              level: 1,
-              type: 's',
-              mandatory: true,
-              default: 'matroska',
-              minver: 1,
-              description: "A string that describes the type of document that follows this EBML header. 'matroska' in our case or 'webm' for webm files.",
-              multiple: false,
-              webm: false
-            }], [0x4285, {
-              name: 'DocTypeReadVersion',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 1,
-              minver: 1,
-              description: 'The minimum DocType version an interpreter has to support to read this file.',
-              multiple: false,
-              webm: false
-            }], [0x4286, {
-              name: 'EBMLVersion',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 1,
-              minver: 1,
-              description: 'The version of EBML parser used to create the file.',
-              multiple: false,
-              webm: false
-            }], [0x4287, {
-              name: 'DocTypeVersion',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 1,
-              minver: 1,
-              description: 'The version of DocType interpreter used to create the file.',
-              multiple: false,
-              webm: false
-            }], [0x4444, {
-              name: 'SegmentFamily',
-              level: 2,
-              type: 'b',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              bytesize: 16,
-              description: 'A randomly generated unique ID that all segments related to each other must use (128 bits).'
-            }], [0x4461, {
-              name: 'DateUTC',
-              level: 2,
-              type: 'd',
-              minver: 1,
-              description: 'Date of the origin of timestamp (value 0), i.e. production date.',
-              multiple: false,
-              webm: false
-            }], [0x4484, {
-              name: 'TagDefault',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 1,
-              range: '0-1',
-              description: 'Indication to know if this is the default/original language to use for the given tag. (1 bit)',
-              multiple: false
-            }], [0x4485, {
-              name: 'TagBinary',
-              level: 4,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString.',
-              multiple: false
-            }], [0x4487, {
-              name: 'TagString',
-              level: 4,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'The value of the Tag.',
-              multiple: false
-            }], [0x4489, {
-              name: 'Duration',
-              level: 2,
-              type: 'f',
-              minver: 1,
-              range: '> 0',
-              description: 'Duration of the segment (based on TimecodeScale).',
-              multiple: false,
-              webm: false
-            }], [0x4598, {
-              name: 'ChapterFlagEnabled',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 1,
-              range: '0-1',
-              description: 'Specify wether the chapter is enabled. It can be enabled/disabled by a Control Track. When disabled, the movie should skip all the content between the TimeStart and TimeEnd of this chapter (see flag notes). (1 bit)',
-              multiple: false
-            }], [0x4660, {
-              name: 'FileMimeType',
-              level: 3,
-              type: 's',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'MIME type of the file.',
-              multiple: false
-            }], [0x4661, {
-              name: 'FileUsedStartTime',
-              level: 3,
-              type: 'u',
-              divx: true,
-              description: 'DivX font extension',
-              multiple: false
-            }], [0x4662, {
-              name: 'FileUsedEndTime',
-              level: 3,
-              type: 'u',
-              divx: true,
-              multiple: false,
-              description: 'DivX font extension'
-            }], [0x4675, {
-              name: 'FileReferral',
-              level: 3,
-              type: 'b',
-              webm: false,
-              description: 'A binary value that a track/codec can refer to when the attachment is needed.',
-              multiple: false
-            }], [0x5031, {
-              name: 'ContentEncodingOrder',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              multiple: false,
-              description: 'Tells when this modification was used during encoding/muxing starting with 0 and counting upwards. The decoder/demuxer has to start with the highest order number it finds and work its way down. This value has to be unique over all ContentEncodingOrder elements in the segment.'
-            }], [0x5032, {
-              name: 'ContentEncodingScope',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 1,
-              range: 'not 0',
-              br: ['', '', ''],
-              description: "A bit field that describes which elements have been modified in this way. Values (big endian) can be OR'ed. Possible values: 1 - all frame contents, 2 - the track's private data, 4 - the next ContentEncoding (next ContentEncodingOrder. Either the data inside ContentCompression and/or ContentEncryption)",
-              multiple: false
-            }], [0x5033, {
-              name: 'ContentEncodingType',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              br: ['', ''],
-              description: 'A value describing what kind of transformation has been done. Possible values: 0 - compression, 1 - encryption',
-              multiple: false
-            }], [0x5034, {
-              name: 'ContentCompression',
-              level: 5,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'Settings describing the compression used. Must be present if the value of ContentEncodingType is 0 and absent otherwise. Each block must be decompressable even if no previous block is available in order not to prevent seeking.',
-              multiple: false
-            }], [0x5035, {
-              name: 'ContentEncryption',
-              level: 5,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'Settings describing the encryption used. Must be present if the value of ContentEncodingType is 1 and absent otherwise.',
-              multiple: false
-            }], [0x5378, {
-              name: 'CueBlockNumber',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 1,
-              range: 'not 0',
-              description: 'Number of the Block in the specified Cluster.',
-              multiple: false
-            }], [0x5654, {
-              name: 'ChapterStringUID',
-              level: 4,
-              type: '8',
-              mandatory: false,
-              minver: 3,
-              webm: true,
-              description: 'A unique string ID to identify the Chapter. Use for WebVTT cue identifier storage.',
-              multiple: false
-            }], [0x5741, {
-              name: 'WritingApp',
-              level: 2,
-              type: '8',
-              mandatory: true,
-              minver: 1,
-              multiple: false,
-              description: 'Writing application ("mkvmerge-0.3.3").'
-            }], [0x5854, {
-              name: 'SilentTracks',
-              cppname: 'ClusterSilentTracks',
-              level: 2,
-              type: 'm',
-              minver: 1,
-              multiple: false,
-              webm: false,
-              description: 'The list of tracks that are not used in that part of the stream. It is useful when using overlay tracks on seeking. Then you should decide what track to use.'
-            }], [0x6240, {
-              name: 'ContentEncoding',
-              level: 4,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Settings for one content encoding like compression or encryption.'
-            }], [0x6264, {
-              name: 'BitDepth',
-              cppname: 'AudioBitDepth',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              range: 'not 0',
-              multiple: false,
-              description: 'Bits per sample, mostly used for PCM.'
-            }], [0x6532, {
-              name: 'SignedElement',
-              level: 3,
-              type: 'b',
-              multiple: true,
-              webm: false,
-              description: 'An element ID whose data will be used to compute the signature.'
-            }], [0x6624, {
-              name: 'TrackTranslate',
-              level: 3,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'The track identification for the given Chapter Codec.'
-            }], [0x6911, {
-              name: 'ChapProcessCommand',
-              cppname: 'ChapterProcessCommand',
-              level: 5,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Contains all the commands associated to the Atom.'
-            }], [0x6922, {
-              name: 'ChapProcessTime',
-              cppname: 'ChapterProcessTime',
-              level: 6,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'Defines when the process command should be handled (0: during the whole chapter, 1: before starting playback, 2: after playback of the chapter).'
-            }], [0x6924, {
-              name: 'ChapterTranslate',
-              level: 2,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'A tuple of corresponding ID used by chapter codecs to represent this segment.'
-            }], [0x6933, {
-              name: 'ChapProcessData',
-              cppname: 'ChapterProcessData',
-              level: 6,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'Contains the command information. The data should be interpreted depending on the ChapProcessCodecID value. For ChapProcessCodecID = 1, the data correspond to the binary DVD cell pre/post commands.'
-            }], [0x6944, {
-              name: 'ChapProcess',
-              cppname: 'ChapterProcess',
-              level: 4,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Contains all the commands associated to the Atom.'
-            }], [0x6955, {
-              name: 'ChapProcessCodecID',
-              cppname: 'ChapterProcessCodecID',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'Contains the type of the codec used for the processing. A value of 0 means native Matroska processing (to be defined), a value of 1 means the DVD command set is used. More codec IDs can be added later.'
-            }], [0x7373, {
-              name: 'Tag',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Element containing elements specific to Tracks/Chapters.'
-            }], [0x7384, {
-              name: 'SegmentFilename',
-              level: 2,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'A filename corresponding to this segment.'
-            }], [0x7446, {
-              name: 'AttachmentLink',
-              cppname: 'TrackAttachmentLink',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              description: 'The UID of an attachment that is used by this codec.'
-            }], [0x258688, {
-              name: 'CodecName',
-              level: 3,
-              type: '8',
-              minver: 1,
-              description: 'A human-readable string specifying the codec.'
-            }], [0x18538067, {
-              name: 'Segment',
-              level: 0,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'This element contains all other top-level (level 1) elements. Typically a Matroska file is composed of 1 segment.'
-            }], [0x447a, {
-              name: 'TagLanguage',
-              level: 4,
-              type: 's',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 'und',
-              description: 'Specifies the language of the tag specified, in the Matroska languages form.'
-            }], [0x45a3, {
-              name: 'TagName',
-              level: 4,
-              type: '8',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The name of the Tag that is going to be stored.'
-            }], [0x67c8, {
-              name: 'SimpleTag',
-              cppname: 'TagSimple',
-              level: 3,
-              recursive: true,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Contains general information about the target.'
-            }], [0x63c6, {
-              name: 'TagAttachmentUID',
-              level: 4,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'A unique ID to identify the Attachment(s) the tags belong to. If the value is 0 at this level, the tags apply to all the attachments in the Segment.'
-            }], [0x63c4, {
-              name: 'TagChapterUID',
-              level: 4,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'A unique ID to identify the Chapter(s) the tags belong to. If the value is 0 at this level, the tags apply to all chapters in the Segment.'
-            }], [0x63c9, {
-              name: 'TagEditionUID',
-              level: 4,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'A unique ID to identify the EditionEntry(s) the tags belong to. If the value is 0 at this level, the tags apply to all editions in the Segment.'
-            }], [0x63c5, {
-              name: 'TagTrackUID',
-              level: 4,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'A unique ID to identify the Track(s) the tags belong to. If the value is 0 at this level, the tags apply to all tracks in the Segment.'
-            }], [0x63ca, {
-              name: 'TargetType',
-              cppname: 'TagTargetType',
-              level: 4,
-              type: 's',
-              minver: 1,
-              webm: false,
-              strong: 'informational',
-              description: 'An  string that can be used to display the logical level of the target like "ALBUM", "TRACK", "MOVIE", "CHAPTER", etc (see TargetType).'
-            }], [0x68ca, {
-              name: 'TargetTypeValue',
-              cppname: 'TagTargetTypeValue',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              default: 50,
-              description: 'A number to indicate the logical level of the target (see TargetType).'
-            }], [0x63c0, {
-              name: 'Targets',
-              cppname: 'TagTargets',
-              level: 3,
-              type: 'm',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'Contain all UIDs where the specified meta data apply. It is empty to describe everything in the segment.'
-            }], [0x1254c367, {
-              name: 'Tags',
-              level: 1,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Element containing elements specific to Tracks/Chapters. A list of valid tags can be found here.'
-            }], [0x450d, {
-              name: 'ChapProcessPrivate',
-              cppname: 'ChapterProcessPrivate',
-              level: 5,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'Some optional data attached to the ChapProcessCodecID information. For ChapProcessCodecID = 1, it is the "DVD level" equivalent.'
-            }], [0x437e, {
-              name: 'ChapCountry',
-              cppname: 'ChapterCountry',
-              level: 5,
-              type: 's',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'The countries corresponding to the string, same 2 octets as in Internet domains.'
-            }], [0x437c, {
-              name: 'ChapLanguage',
-              cppname: 'ChapterLanguage',
-              level: 5,
-              type: 's',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: true,
-              default: 'eng',
-              description: 'The languages corresponding to the string, in the bibliographic ISO-639-2 form.'
-            }], [0x8f, {
-              name: 'ChapterTrack',
-              level: 4,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'List of tracks on which the chapter applies. If this element is not present, all tracks apply'
-            }], [0x63c3, {
-              name: 'ChapterPhysicalEquiv',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              description: 'Specify the physical equivalent of this ChapterAtom like "DVD" (60) or "SIDE" (50), see complete list of values.'
-            }], [0x6ebc, {
-              name: 'ChapterSegmentEditionUID',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              description: 'The EditionUID to play from the segment linked in ChapterSegmentUID.'
-            }], [0x6e67, {
-              name: 'ChapterSegmentUID',
-              level: 4,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              range: '>0',
-              bytesize: 16,
-              description: 'A segment to play in place of this chapter. Edition ChapterSegmentEditionUID should be used for this segment, otherwise no edition is used.'
-            }], [0x73c4, {
-              name: 'ChapterUID',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: true,
-              range: 'not 0',
-              description: 'A unique ID to identify the Chapter.'
-            }], [0xb6, {
-              name: 'ChapterAtom',
-              level: 3,
-              recursive: true,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: true,
-              description: 'Contains the atom information to use as the chapter atom (apply to all tracks).'
-            }], [0x45dd, {
-              name: 'EditionFlagOrdered',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              default: 0,
-              range: '0-1',
-              description: 'Specify if the chapters can be defined multiple times and the order to play them is enforced. (1 bit)'
-            }], [0x45db, {
-              name: 'EditionFlagDefault',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              range: '0-1',
-              description: 'If a flag is set (1) the edition should be used as the default one. (1 bit)'
-            }], [0x45bd, {
-              name: 'EditionFlagHidden',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              range: '0-1',
-              description: 'If an edition is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)'
-            }], [0x45bc, {
-              name: 'EditionUID',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              description: "A unique ID to identify the edition. It's useful for tagging an edition."
-            }], [0x45b9, {
-              name: 'EditionEntry',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: true,
-              description: 'Contains all information about a segment edition.'
-            }], [0x1043a770, {
-              name: 'Chapters',
-              level: 1,
-              type: 'm',
-              minver: 1,
-              webm: true,
-              description: 'A system to define basic menus and partition data. For more detailed information, look at the Chapters Explanation.'
-            }], [0x46ae, {
-              name: 'FileUID',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              description: 'Unique ID representing the file, as random as possible.'
-            }], [0x465c, {
-              name: 'FileData',
-              level: 3,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The data of the file.'
-            }], [0x466e, {
-              name: 'FileName',
-              level: 3,
-              type: '8',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'Filename of the attached file.'
-            }], [0x467e, {
-              name: 'FileDescription',
-              level: 3,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'A human-friendly name for the attached file.'
-            }], [0x61a7, {
-              name: 'AttachedFile',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'An attached file.'
-            }], [0x1941a469, {
-              name: 'Attachments',
-              level: 1,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'Contain attached files.'
-            }], [0xeb, {
-              name: 'CueRefCodecState',
-              level: 5,
-              type: 'u',
-              webm: false,
-              default: 0,
-              description: 'The position of the Codec State corresponding to this referenced element. 0 means that the data is taken from the initial Track Entry.'
-            }], [0x535f, {
-              name: 'CueRefNumber',
-              level: 5,
-              type: 'u',
-              webm: false,
-              default: 1,
-              range: 'not 0',
-              description: 'Number of the referenced Block of Track X in the specified Cluster.'
-            }], [0xdb, {
-              name: 'CueReference',
-              level: 4,
-              type: 'm',
-              multiple: true,
-              minver: 2,
-              webm: false,
-              description: 'The Clusters containing the required referenced Blocks.'
-            }], [0xea, {
-              name: 'CueCodecState',
-              level: 4,
-              type: 'u',
-              minver: 2,
-              webm: false,
-              default: 0,
-              description: 'The position of the Codec State corresponding to this Cue element. 0 means that the data is taken from the initial Track Entry.'
-            }], [0xb2, {
-              name: 'CueDuration',
-              level: 4,
-              type: 'u',
-              mandatory: false,
-              minver: 4,
-              webm: false,
-              description: "The duration of the block according to the segment time base. If missing the track's DefaultDuration does not apply and no duration information is available in terms of the cues."
-            }], [0xf0, {
-              name: 'CueRelativePosition',
-              level: 4,
-              type: 'u',
-              mandatory: false,
-              minver: 4,
-              webm: false,
-              description: 'The relative position of the referenced block inside the cluster with 0 being the first possible position for an element inside that cluster.'
-            }], [0xf1, {
-              name: 'CueClusterPosition',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              description: 'The position of the Cluster containing the required Block.'
-            }], [0xf7, {
-              name: 'CueTrack',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              range: 'not 0',
-              description: 'The track for which a position is given.'
-            }], [0xb7, {
-              name: 'CueTrackPositions',
-              level: 3,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Contain positions for different tracks corresponding to the timestamp.'
-            }], [0xb3, {
-              name: 'CueTime',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              description: 'Absolute timestamp according to the segment time base.'
-            }], [0xbb, {
-              name: 'CuePoint',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Contains all information relative to a seek point in the segment.'
-            }], [0x1c53bb6b, {
-              name: 'Cues',
-              level: 1,
-              type: 'm',
-              minver: 1,
-              description: 'A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non "live" streams.'
-            }], [0x47e6, {
-              name: 'ContentSigHashAlgo',
-              level: 6,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              default: 0,
-              br: ['', ''],
-              description: "The hash algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - SHA1-160 2 - MD5"
-            }], [0x47e5, {
-              name: 'ContentSigAlgo',
-              level: 6,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              default: 0,
-              br: '',
-              description: "The algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - RSA"
-            }], [0x47e4, {
-              name: 'ContentSigKeyID',
-              level: 6,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'This is the ID of the private key the data was signed with.'
-            }], [0x47e3, {
-              name: 'ContentSignature',
-              level: 6,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'A cryptographic signature of the contents.'
-            }], [0x47e2, {
-              name: 'ContentEncKeyID',
-              level: 6,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: 'For public key algorithms this is the ID of the public key the the data was encrypted with.'
-            }], [0x47e1, {
-              name: 'ContentEncAlgo',
-              level: 6,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              default: 0,
-              br: '',
-              description: "The encryption algorithm used. The value '0' means that the contents have not been encrypted but only signed. Predefined values: 1 - DES, 2 - 3DES, 3 - Twofish, 4 - Blowfish, 5 - AES"
-            }], [0x6d80, {
-              name: 'ContentEncodings',
-              level: 3,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'Settings for several content encoding mechanisms like compression or encryption.'
-            }], [0xc4, {
-              name: 'TrickMasterTrackSegmentUID',
-              level: 3,
-              type: 'b',
-              divx: true,
-              bytesize: 16,
-              description: 'DivX trick track extenstions'
-            }], [0xc7, {
-              name: 'TrickMasterTrackUID',
-              level: 3,
-              type: 'u',
-              divx: true,
-              description: 'DivX trick track extenstions'
-            }], [0xc6, {
-              name: 'TrickTrackFlag',
-              level: 3,
-              type: 'u',
-              divx: true,
-              default: 0,
-              description: 'DivX trick track extenstions'
-            }], [0xc1, {
-              name: 'TrickTrackSegmentUID',
-              level: 3,
-              type: 'b',
-              divx: true,
-              bytesize: 16,
-              description: 'DivX trick track extenstions'
-            }], [0xc0, {
-              name: 'TrickTrackUID',
-              level: 3,
-              type: 'u',
-              divx: true,
-              description: 'DivX trick track extenstions'
-            }], [0xed, {
-              name: 'TrackJoinUID',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              multiple: true,
-              minver: 3,
-              webm: false,
-              range: 'not 0',
-              description: 'The trackUID number of a track whose blocks are used to create this virtual track.'
-            }], [0xe9, {
-              name: 'TrackJoinBlocks',
-              level: 4,
-              type: 'm',
-              minver: 3,
-              webm: false,
-              description: 'Contains the list of all tracks whose Blocks need to be combined to create this virtual track'
-            }], [0xe6, {
-              name: 'TrackPlaneType',
-              level: 6,
-              type: 'u',
-              mandatory: true,
-              minver: 3,
-              webm: false,
-              description: 'The kind of plane this track corresponds to (0: left eye, 1: right eye, 2: background).'
-            }], [0xe5, {
-              name: 'TrackPlaneUID',
-              level: 6,
-              type: 'u',
-              mandatory: true,
-              minver: 3,
-              webm: false,
-              range: 'not 0',
-              description: 'The trackUID number of the track representing the plane.'
-            }], [0xe4, {
-              name: 'TrackPlane',
-              level: 5,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 3,
-              webm: false,
-              description: 'Contains a video plane track that need to be combined to create this 3D track'
-            }], [0xe3, {
-              name: 'TrackCombinePlanes',
-              level: 4,
-              type: 'm',
-              minver: 3,
-              webm: false,
-              description: 'Contains the list of all video plane tracks that need to be combined to create this 3D track'
-            }], [0xe2, {
-              name: 'TrackOperation',
-              level: 3,
-              type: 'm',
-              minver: 3,
-              webm: false,
-              description: 'Operation that needs to be applied on tracks to create this virtual track. For more details look at the Specification Notes on the subject.'
-            }], [0x7d7b, {
-              name: 'ChannelPositions',
-              cppname: 'AudioPosition',
-              level: 4,
-              type: 'b',
-              webm: false,
-              description: 'Table of horizontal angles for each successive channel, see appendix.'
-            }], [0x9f, {
-              name: 'Channels',
-              cppname: 'AudioChannels',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              default: 1,
-              range: 'not 0',
-              description: 'Numbers of channels in the track.'
-            }], [0x78b5, {
-              name: 'OutputSamplingFrequency',
-              cppname: 'AudioOutputSamplingFreq',
-              level: 4,
-              type: 'f',
-              minver: 1,
-              default: 'Sampling Frequency',
-              range: '> 0',
-              description: 'Real output sampling frequency in Hz (used for SBR techniques).'
-            }], [0xb5, {
-              name: 'SamplingFrequency',
-              cppname: 'AudioSamplingFreq',
-              level: 4,
-              type: 'f',
-              mandatory: true,
-              minver: 1,
-              default: '8000.0',
-              range: '> 0',
-              description: 'Sampling frequency in Hz.'
-            }], [0xe1, {
-              name: 'Audio',
-              cppname: 'TrackAudio',
-              level: 3,
-              type: 'm',
-              minver: 1,
-              description: 'Audio settings.'
-            }], [0x2383e3, {
-              name: 'FrameRate',
-              cppname: 'VideoFrameRate',
-              level: 4,
-              type: 'f',
-              range: '> 0',
-              strong: 'Informational',
-              description: 'Number of frames per second.  only.'
-            }], [0x2fb523, {
-              name: 'GammaValue',
-              cppname: 'VideoGamma',
-              level: 4,
-              type: 'f',
-              webm: false,
-              range: '> 0',
-              description: 'Gamma Value.'
-            }], [0x2eb524, {
-              name: 'ColourSpace',
-              cppname: 'VideoColourSpace',
-              level: 4,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              bytesize: 4,
-              description: 'Same value as in AVI (32 bits).'
-            }], [0x54b3, {
-              name: 'AspectRatioType',
-              cppname: 'VideoAspectRatio',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'Specify the possible modifications to the aspect ratio (0: free resizing, 1: keep aspect ratio, 2: fixed).'
-            }], [0x54b2, {
-              name: 'DisplayUnit',
-              cppname: 'VideoDisplayUnit',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'How DisplayWidth & DisplayHeight should be interpreted (0: pixels, 1: centimeters, 2: inches, 3: Display Aspect Ratio).'
-            }], [0x54ba, {
-              name: 'DisplayHeight',
-              cppname: 'VideoDisplayHeight',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 'PixelHeight',
-              range: 'not 0',
-              description: 'Height of the video frames to display. The default value is only valid when DisplayUnit is 0.'
-            }], [0x54b0, {
-              name: 'DisplayWidth',
-              cppname: 'VideoDisplayWidth',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 'PixelWidth',
-              range: 'not 0',
-              description: 'Width of the video frames to display. The default value is only valid when DisplayUnit is 0.'
-            }], [0x54dd, {
-              name: 'PixelCropRight',
-              cppname: 'VideoPixelCropRight',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'The number of video pixels to remove on the right of the image.'
-            }], [0x54cc, {
-              name: 'PixelCropLeft',
-              cppname: 'VideoPixelCropLeft',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'The number of video pixels to remove on the left of the image.'
-            }], [0x54bb, {
-              name: 'PixelCropTop',
-              cppname: 'VideoPixelCropTop',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'The number of video pixels to remove at the top of the image.'
-            }], [0x54aa, {
-              name: 'PixelCropBottom',
-              cppname: 'VideoPixelCropBottom',
-              level: 4,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              description: 'The number of video pixels to remove at the bottom of the image (for HDTV content).'
-            }], [0xba, {
-              name: 'PixelHeight',
-              cppname: 'VideoPixelHeight',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              range: 'not 0',
-              description: 'Height of the encoded video frames in pixels.'
-            }], [0xb0, {
-              name: 'PixelWidth',
-              cppname: 'VideoPixelWidth',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              range: 'not 0',
-              description: 'Width of the encoded video frames in pixels.'
-            }], [0x53b9, {
-              name: 'OldStereoMode',
-              level: 4,
-              type: 'u',
-              maxver: '0',
-              webm: false,
-              divx: false,
-              description: 'DEPRECATED, DO NOT USE. Bogus StereoMode value used in old versions of libmatroska. (0: mono, 1: right eye, 2: left eye, 3: both eyes).'
-            }], [0x53c0, {
-              name: 'AlphaMode',
-              cppname: 'VideoAlphaMode',
-              level: 4,
-              type: 'u',
-              minver: 3,
-              webm: true,
-              default: 0,
-              description: 'Alpha Video Mode. Presence of this element indicates that the BlockAdditional element could contain Alpha data.'
-            }], [0x53b8, {
-              name: 'StereoMode',
-              cppname: 'VideoStereoMode',
-              level: 4,
-              type: 'u',
-              minver: 3,
-              webm: true,
-              default: 0,
-              description: 'Stereo-3D video mode (0: mono, 1: side by side (left eye is first), 2: top-bottom (right eye is first), 3: top-bottom (left eye is first), 4: checkboard (right is first), 5: checkboard (left is first), 6: row interleaved (right is first), 7: row interleaved (left is first), 8: column interleaved (right is first), 9: column interleaved (left is first), 10: anaglyph (cyan/red), 11: side by side (right eye is first), 12: anaglyph (green/magenta), 13 both eyes laced in one Block (left eye is first), 14 both eyes laced in one Block (right eye is first)) . There are some more details on 3D support in the Specification Notes.'
-            }], [0x9a, {
-              name: 'FlagInterlaced',
-              cppname: 'VideoFlagInterlaced',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 2,
-              webm: true,
-              default: 0,
-              range: '0-1',
-              description: 'Set if the video is interlaced. (1 bit)'
-            }], [0xe0, {
-              name: 'Video',
-              cppname: 'TrackVideo',
-              level: 3,
-              type: 'm',
-              minver: 1,
-              description: 'Video settings.'
-            }], [0x66a5, {
-              name: 'TrackTranslateTrackID',
-              level: 4,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The binary value used to represent this track in the chapter codec data. The format depends on the ChapProcessCodecID used.'
-            }], [0x66bf, {
-              name: 'TrackTranslateCodec',
-              level: 4,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).'
-            }], [0x66fc, {
-              name: 'TrackTranslateEditionUID',
-              level: 4,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Specify an edition UID on which this translation applies. When not specified, it means for all editions found in the segment.'
-            }], [0x56bb, {
-              name: 'SeekPreRoll',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              multiple: false,
-              default: 0,
-              minver: 4,
-              webm: true,
-              description: 'After a discontinuity, SeekPreRoll is the duration in nanoseconds of the data the decoder must decode before the decoded data is valid.'
-            }], [0x56aa, {
-              name: 'CodecDelay',
-              level: 3,
-              type: 'u',
-              multiple: false,
-              default: 0,
-              minver: 4,
-              webm: true,
-              description: 'CodecDelay is The codec-built-in delay in nanoseconds. This value must be subtracted from each block timestamp in order to get the actual timestamp. The value should be small so the muxing of tracks with the same actual timestamp are in the same Cluster.'
-            }], [0x6fab, {
-              name: 'TrackOverlay',
-              level: 3,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Specify that this track is an overlay track for the Track specified (in the u-integer). That means when this track has a gap (see SilentTracks) the overlay track should be used instead. The order of multiple TrackOverlay matters, the first one is the one that should be used. If not found it should be the second, etc.'
-            }], [0xaa, {
-              name: 'CodecDecodeAll',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 2,
-              webm: false,
-              default: 1,
-              range: '0-1',
-              description: 'The codec can decode potentially damaged data (1 bit).'
-            }], [0x26b240, {
-              name: 'CodecDownloadURL',
-              level: 3,
-              type: 's',
-              multiple: true,
-              webm: false,
-              description: 'A URL to download about the codec used.'
-            }], [0x3b4040, {
-              name: 'CodecInfoURL',
-              level: 3,
-              type: 's',
-              multiple: true,
-              webm: false,
-              description: 'A URL to find information about the codec used.'
-            }], [0x3a9697, {
-              name: 'CodecSettings',
-              level: 3,
-              type: '8',
-              webm: false,
-              description: 'A string describing the encoding setting used.'
-            }], [0x63a2, {
-              name: 'CodecPrivate',
-              level: 3,
-              type: 'b',
-              minver: 1,
-              description: 'Private data only known to the codec.'
-            }], [0x22b59c, {
-              name: 'Language',
-              cppname: 'TrackLanguage',
-              level: 3,
-              type: 's',
-              minver: 1,
-              default: 'eng',
-              description: 'Specifies the language of the track in the Matroska languages form.'
-            }], [0x536e, {
-              name: 'Name',
-              cppname: 'TrackName',
-              level: 3,
-              type: '8',
-              minver: 1,
-              description: 'A human-readable track name.'
-            }], [0x55ee, {
-              name: 'MaxBlockAdditionID',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'The maximum value of BlockAdditions for this track.'
-            }], [0x537f, {
-              name: 'TrackOffset',
-              level: 3,
-              type: 'i',
-              webm: false,
-              default: 0,
-              description: "A value to add to the Block's Timestamp. This can be used to adjust the playback offset of a track."
-            }], [0x23314f, {
-              name: 'TrackTimecodeScale',
-              level: 3,
-              type: 'f',
-              mandatory: true,
-              minver: 1,
-              maxver: '3',
-              webm: false,
-              default: '1.0',
-              range: '> 0',
-              description: 'DEPRECATED, DO NOT USE. The scale to apply on this track to work at normal speed in relation with other tracks (mostly used to adjust video speed when the audio length differs).'
-            }], [0x234e7a, {
-              name: 'DefaultDecodedFieldDuration',
-              cppname: 'TrackDefaultDecodedFieldDuration',
-              level: 3,
-              type: 'u',
-              minver: 4,
-              range: 'not 0',
-              description: 'The period in nanoseconds (not scaled by TimcodeScale)\nbetween two successive fields at the output of the decoding process (see the notes)'
-            }], [0x23e383, {
-              name: 'DefaultDuration',
-              cppname: 'TrackDefaultDuration',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              range: 'not 0',
-              description: "Number of nanoseconds (not scaled via TimecodeScale) per frame ('frame' in the Matroska sense -- one element put into a (Simple)Block)."
-            }], [0x6df8, {
-              name: 'MaxCache',
-              cppname: 'TrackMaxCache',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              description: 'The maximum cache size required to store referenced frames in and the current frame. 0 means no cache is needed.'
-            }], [0x6de7, {
-              name: 'MinCache',
-              cppname: 'TrackMinCache',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'The minimum number of frames a player should be able to cache during playback. If set to 0, the reference pseudo-cache system is not used.'
-            }], [0x9c, {
-              name: 'FlagLacing',
-              cppname: 'TrackFlagLacing',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              default: 1,
-              range: '0-1',
-              description: 'Set if the track may contain blocks using lacing. (1 bit)'
-            }], [0x55aa, {
-              name: 'FlagForced',
-              cppname: 'TrackFlagForced',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              default: 0,
-              range: '0-1',
-              description: 'Set if that track MUST be active during playback. There can be many forced track for a kind (audio, video or subs), the player should select the one which language matches the user preference or the default + forced track. Overlay MAY happen between a forced and non-forced track of the same kind. (1 bit)'
-            }], [0xb9, {
-              name: 'FlagEnabled',
-              cppname: 'TrackFlagEnabled',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 2,
-              webm: true,
-              default: 1,
-              range: '0-1',
-              description: 'Set if the track is usable. (1 bit)'
-            }], [0x73c5, {
-              name: 'TrackUID',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              range: 'not 0',
-              description: 'A unique ID to identify the Track. This should be kept the same when making a direct stream copy of the Track to another file.'
-            }], [0xd7, {
-              name: 'TrackNumber',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              range: 'not 0',
-              description: 'The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number).'
-            }], [0xae, {
-              name: 'TrackEntry',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Describes a track with all elements.'
-            }], [0x1654ae6b, {
-              name: 'Tracks',
-              level: 1,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              description: 'A top-level block of information with many tracks described.'
-            }], [0xaf, {
-              name: 'EncryptedBlock',
-              level: 2,
-              type: 'b',
-              multiple: true,
-              webm: false,
-              description: 'Similar to EncryptedBlock Structure)'
-            }], [0xca, {
-              name: 'ReferenceTimeCode',
-              level: 4,
-              type: 'u',
-              multiple: false,
-              mandatory: true,
-              minver: 0,
-              webm: false,
-              divx: true,
-              description: 'DivX trick track extenstions'
-            }], [0xc9, {
-              name: 'ReferenceOffset',
-              level: 4,
-              type: 'u',
-              multiple: false,
-              mandatory: true,
-              minver: 0,
-              webm: false,
-              divx: true,
-              description: 'DivX trick track extenstions'
-            }], [0xc8, {
-              name: 'ReferenceFrame',
-              level: 3,
-              type: 'm',
-              multiple: false,
-              minver: 0,
-              webm: false,
-              divx: true,
-              description: 'DivX trick track extenstions'
-            }], [0xcf, {
-              name: 'SliceDuration',
-              level: 5,
-              type: 'u',
-              default: 0,
-              description: 'The (scaled) duration to apply to the element.'
-            }], [0xce, {
-              name: 'Delay',
-              cppname: 'SliceDelay',
-              level: 5,
-              type: 'u',
-              default: 0,
-              description: 'The (scaled) delay to apply to the element.'
-            }], [0xcb, {
-              name: 'BlockAdditionID',
-              cppname: 'SliceBlockAddID',
-              level: 5,
-              type: 'u',
-              default: 0,
-              description: 'The ID of the BlockAdditional element (0 is the main Block).'
-            }], [0xcd, {
-              name: 'FrameNumber',
-              cppname: 'SliceFrameNumber',
-              level: 5,
-              type: 'u',
-              default: 0,
-              description: 'The number of the frame to generate from this lace with this delay (allow you to generate many frames from the same Block/Frame).'
-            }], [0xcc, {
-              name: 'LaceNumber',
-              cppname: 'SliceLaceNumber',
-              level: 5,
-              type: 'u',
-              minver: 1,
-              default: 0,
-              divx: false,
-              description: 'The reverse number of the frame in the lace (0 is the last frame, 1 is the next to last, etc). While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.'
-            }], [0xe8, {
-              name: 'TimeSlice',
-              level: 4,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              divx: false,
-              description: 'Contains extra time information about the data contained in the Block. While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback.'
-            }], [0x8e, {
-              name: 'Slices',
-              level: 3,
-              type: 'm',
-              minver: 1,
-              divx: false,
-              description: 'Contains slices description.'
-            }], [0x75a2, {
-              name: 'DiscardPadding',
-              level: 3,
-              type: 'i',
-              minver: 4,
-              webm: true,
-              description: 'Duration in nanoseconds of the silent data added to the Block (padding at the end of the Block for positive value, at the beginning of the Block for negative value). The duration of DiscardPadding is not calculated in the duration of the TrackEntry and should be discarded during playback.'
-            }], [0xa4, {
-              name: 'CodecState',
-              level: 3,
-              type: 'b',
-              minver: 2,
-              webm: false,
-              description: 'The new codec state to use. Data interpretation is private to the codec. This information should always be referenced by a seek entry.'
-            }], [0xfd, {
-              name: 'ReferenceVirtual',
-              level: 3,
-              type: 'i',
-              webm: false,
-              description: 'Relative position of the data that should be in position of the virtual block.'
-            }], [0xfb, {
-              name: 'ReferenceBlock',
-              level: 3,
-              type: 'i',
-              multiple: true,
-              minver: 1,
-              description: "Timestamp of another frame used as a reference (ie: B or P frame). The timestamp is relative to the block it's attached to."
-            }], [0xfa, {
-              name: 'ReferencePriority',
-              cppname: 'FlagReferenced',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 0,
-              description: 'This frame is referenced and has the specified cache priority. In cache only a frame of the same or higher priority can replace this frame. A value of 0 means the frame is not referenced.'
-            }], [0x9b, {
-              name: 'BlockDuration',
-              level: 3,
-              type: 'u',
-              minver: 1,
-              default: 'TrackDuration',
-              description: 'The duration of the Block (based on TimecodeScale). This element is mandatory when DefaultDuration is set for the track (but can be omitted as other default values). When not written and with no DefaultDuration, the value is assumed to be the difference between the timestamp of this Block and the timestamp of the next Block in "display" order (not coding order). This element can be useful at the end of a Track (as there is not other Block available), or when there is a break in a track like for subtitle tracks. When set to 0 that means the frame is not a keyframe.'
-            }], [0xa5, {
-              name: 'BlockAdditional',
-              level: 5,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'Interpreted by the codec as it wishes (using the BlockAddID).'
-            }], [0xee, {
-              name: 'BlockAddID',
-              level: 5,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              default: 1,
-              range: 'not 0',
-              description: 'An ID to identify the BlockAdditional level.'
-            }], [0xa6, {
-              name: 'BlockMore',
-              level: 4,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Contain the BlockAdditional and some parameters.'
-            }], [0x75a1, {
-              name: 'BlockAdditions',
-              level: 3,
-              type: 'm',
-              minver: 1,
-              webm: false,
-              description: 'Contain additional blocks to complete the main one. An EBML parser that has no knowledge of the Block structure could still see and use/skip these data.'
-            }], [0xa2, {
-              name: 'BlockVirtual',
-              level: 3,
-              type: 'b',
-              webm: false,
-              description: 'A Block with no data. It must be stored in the stream at the place the real Block should be in display order. (see Block Virtual)'
-            }], [0xa1, {
-              name: 'Block',
-              level: 3,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              description: 'Block containing the actual data to be rendered and a timestamp relative to the Cluster Timecode. (see Block Structure)'
-            }], [0xa0, {
-              name: 'BlockGroup',
-              level: 2,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              description: 'Basic container of information containing a single Block or BlockVirtual, and information specific to that Block/VirtualBlock.'
-            }], [0xa3, {
-              name: 'SimpleBlock',
-              level: 2,
-              type: 'b',
-              multiple: true,
-              minver: 2,
-              webm: true,
-              divx: true,
-              description: 'Similar to SimpleBlock Structure)'
-            }], [0xab, {
-              name: 'PrevSize',
-              cppname: 'ClusterPrevSize',
-              level: 2,
-              type: 'u',
-              minver: 1,
-              description: 'Size of the previous Cluster, in octets. Can be useful for backward playing.'
-            }], [0xa7, {
-              name: 'Position',
-              cppname: 'ClusterPosition',
-              level: 2,
-              type: 'u',
-              minver: 1,
-              webm: false,
-              description: 'The Position of the Cluster in the segment (0 in live broadcast streams). It might help to resynchronise offset on damaged streams.'
-            }], [0x58d7, {
-              name: 'SilentTrackNumber',
-              cppname: 'ClusterSilentTrackNumber',
-              level: 3,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'One of the track number that are not used from now on in the stream. It could change later if not specified as silent in a further Cluster.'
-            }], [0xe7, {
-              name: 'Timecode',
-              cppname: 'ClusterTimecode',
-              level: 2,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              description: 'Absolute timestamp of the cluster (based on TimecodeScale).'
-            }], [0x1f43b675, {
-              name: 'Cluster',
-              level: 1,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              description: 'The lower level element containing the (monolithic) Block structure.'
-            }], [0x4d80, {
-              name: 'MuxingApp',
-              level: 2,
-              type: '8',
-              mandatory: true,
-              minver: 1,
-              description: 'Muxing application or library ("libmatroska-0.4.3").'
-            }], [0x7ba9, {
-              name: 'Title',
-              level: 2,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'General name of the segment.'
-            }], [0x2ad7b2, {
-              name: 'TimecodeScaleDenominator',
-              level: 2,
-              type: 'u',
-              mandatory: true,
-              minver: 4,
-              default: 1000000000,
-              description: 'Timestamp scale numerator, see TimecodeScale.'
-            }], [0x2ad7b1, {
-              name: 'TimecodeScale',
-              level: 2,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              default: 1000000,
-              description: 'Timestamp scale in nanoseconds (1.000.000 means all timestamps in the segment are expressed in milliseconds).'
-            }], [0x69a5, {
-              name: 'ChapterTranslateID',
-              level: 3,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The binary value used to represent this segment in the chapter codec data. The format depends on the ChapProcessCodecID used.'
-            }], [0x69bf, {
-              name: 'ChapterTranslateCodec',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              webm: false,
-              description: 'The chapter codec using this ID (0: Matroska Script, 1: DVD-menu).'
-            }], [0x69fc, {
-              name: 'ChapterTranslateEditionUID',
-              level: 3,
-              type: 'u',
-              multiple: true,
-              minver: 1,
-              webm: false,
-              description: 'Specify an edition UID on which this correspondance applies. When not specified, it means for all editions found in the segment.'
-            }], [0x3e83bb, {
-              name: 'NextFilename',
-              level: 2,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'An escaped filename corresponding to the next segment.'
-            }], [0x3eb923, {
-              name: 'NextUID',
-              level: 2,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              bytesize: 16,
-              description: 'A unique ID to identify the next chained segment (128 bits).'
-            }], [0x3c83ab, {
-              name: 'PrevFilename',
-              level: 2,
-              type: '8',
-              minver: 1,
-              webm: false,
-              description: 'An escaped filename corresponding to the previous segment.'
-            }], [0x3cb923, {
-              name: 'PrevUID',
-              level: 2,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              bytesize: 16,
-              description: 'A unique ID to identify the previous chained segment (128 bits).'
-            }], [0x73a4, {
-              name: 'SegmentUID',
-              level: 2,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              range: 'not 0',
-              bytesize: 16,
-              description: 'A randomly generated unique ID to identify the current segment between many others (128 bits).'
-            }], [0x1549a966, {
-              name: 'Info',
-              level: 1,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Contains miscellaneous general information and statistics on the file.'
-            }], [0x53ac, {
-              name: 'SeekPosition',
-              level: 3,
-              type: 'u',
-              mandatory: true,
-              minver: 1,
-              description: 'The position of the element in the segment in octets (0 = first level 1 element).'
-            }], [0x53ab, {
-              name: 'SeekID',
-              level: 3,
-              type: 'b',
-              mandatory: true,
-              minver: 1,
-              description: 'The binary ID corresponding to the element name.'
-            }], [0x4dbb, {
-              name: 'Seek',
-              cppname: 'SeekPoint',
-              level: 2,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Contains a single seek entry to an EBML element.'
-            }], [0x114d9b74, {
-              name: 'SeekHead',
-              cppname: 'SeekHeader',
-              level: 1,
-              type: 'm',
-              multiple: true,
-              minver: 1,
-              description: 'Contains the position of other level 1 elements.'
-            }], [0x7e7b, {
-              name: 'SignatureElementList',
-              level: 2,
-              type: 'm',
-              multiple: true,
-              webm: false,
-              i: 'Cluster|Block|BlockAdditional',
-              description: 'A list consists of a number of consecutive elements that represent one case where data is used in signature. Ex:  means that the BlockAdditional of all Blocks in all Clusters is used for encryption.'
-            }], [0x7e5b, {
-              name: 'SignatureElements',
-              level: 1,
-              type: 'm',
-              webm: false,
-              description: 'Contains elements that will be used to compute the signature.'
-            }], [0x7eb5, {
-              name: 'Signature',
-              level: 1,
-              type: 'b',
-              webm: false,
-              description: 'The signature of the data (until a new.'
-            }], [0x7ea5, {
-              name: 'SignaturePublicKey',
-              level: 1,
-              type: 'b',
-              webm: false,
-              description: 'The public key to use with the algorithm (in the case of a PKI-based signature).'
-            }], [0x7e9a, {
-              name: 'SignatureHash',
-              level: 1,
-              type: 'u',
-              webm: false,
-              description: 'Hash algorithm used (1=SHA1-160, 2=MD5).'
-            }], [0x7e8a, {
-              name: 'SignatureAlgo',
-              level: 1,
-              type: 'u',
-              webm: false,
-              description: 'Signature algorithm used (1=RSA, 2=elliptic).'
-            }], [0x1b538667, {
-              name: 'SignatureSlot',
-              level: -1,
-              type: 'm',
-              multiple: true,
-              webm: false,
-              description: 'Contain signature of some (coming) elements in the stream.'
-            }], [0xbf, {
-              name: 'CRC-32',
-              level: -1,
-              type: 'b',
-              minver: 1,
-              webm: false,
-              description: "The CRC is computed on all the data of the Master element it's in. The CRC element should be the first in it's parent master for easier reading. All level 1 elements should include a CRC-32. The CRC in use is the IEEE CRC32 Little Endian"
-            }], [0xec, {
-              name: 'Void',
-              level: -1,
-              type: 'b',
-              minver: 1,
-              description: 'Used to void damaged data, to avoid unexpected behaviors when using damaged data. The content is discarded. Also used to reserve space in a sub-element for later use.'
-            }], [0x42f3, {
-              name: 'EBMLMaxSizeLength',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 8,
-              minver: 1,
-              description: "The maximum length of the sizes you'll find in this file (8 or less in Matroska). This does not override the element size indicated at the beginning of an element. Elements that have an indicated size which is larger than what is allowed by EBMLMaxSizeLength shall be considered invalid."
-            }], [0x42f2, {
-              name: 'EBMLMaxIDLength',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 4,
-              minver: 1,
-              description: "The maximum length of the IDs you'll find in this file (4 or less in Matroska)."
-            }], [0x42f7, {
-              name: 'EBMLReadVersion',
-              level: 1,
-              type: 'u',
-              mandatory: true,
-              default: 1,
-              minver: 1,
-              description: 'The minimum EBML version a parser has to support to read this file.'
-            }], [0x1a45dfa3, {
-              name: 'EBML',
-              level: 0,
-              type: 'm',
-              mandatory: true,
-              multiple: true,
-              minver: 1,
-              description: 'Set the EBML characteristics of the data to follow. Each EBML document has to start with this.'
-            }]]);
-
-            // 20.1.2.3 Number.isInteger(number)
-
-            var floor$1 = Math.floor;
-            var _isInteger = function isInteger(it) {
-              return !_isObject(it) && isFinite(it) && floor$1(it) === it;
-            };
-
-            // 20.1.2.3 Number.isInteger(number)
-
-
-            _export(_export.S, 'Number', { isInteger: _isInteger });
-
-            var $parseInt = _global.parseInt;
-            var $trim$1 = _stringTrim.trim;
-
-            var hex = /^[-+]?0[xX]/;
-
-            var _parseInt = $parseInt(_stringWs + '08') !== 8 || $parseInt(_stringWs + '0x16') !== 22 ? function parseInt(str, radix) {
-              var string = $trim$1(String(str), 3);
-              return $parseInt(string, (radix >>> 0) || (hex.test(string) ? 16 : 10));
-            } : $parseInt;
-
-            // 20.1.2.13 Number.parseInt(string, radix)
-            _export(_export.S + _export.F * (Number.parseInt != _parseInt), 'Number', { parseInt: _parseInt });
-
-            var domain;
-
-            // This constructor is used to store event handlers. Instantiating this is
-            // faster than explicitly calling `Object.create(null)` to get a "clean" empty
-            // object (tested with v8 v4.9).
-            function EventHandlers() {}
-            EventHandlers.prototype = Object.create(null);
-
-            function EventEmitter() {
-              EventEmitter.init.call(this);
-            }
-
-            // nodejs oddity
-            // require('events') === require('events').EventEmitter
-            EventEmitter.EventEmitter = EventEmitter;
-
-            EventEmitter.usingDomains = false;
-
-            EventEmitter.prototype.domain = undefined;
-            EventEmitter.prototype._events = undefined;
-            EventEmitter.prototype._maxListeners = undefined;
-
-            // By default EventEmitters will print a warning if more than 10 listeners are
-            // added to it. This is a useful default which helps finding memory leaks.
-            EventEmitter.defaultMaxListeners = 10;
-
-            EventEmitter.init = function() {
-              this.domain = null;
-              if (EventEmitter.usingDomains) {
-                // if there is an active domain, then attach to it.
-                if (domain.active && !(this instanceof domain.Domain)) ;
-              }
-
-              if (!this._events || this._events === Object.getPrototypeOf(this)._events) {
-                this._events = new EventHandlers();
-                this._eventsCount = 0;
-              }
-
-              this._maxListeners = this._maxListeners || undefined;
-            };
-
-            // Obviously not all Emitters should be limited to 10. This function allows
-            // that to be increased. Set to zero for unlimited.
-            EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
-              if (typeof n !== 'number' || n < 0 || isNaN(n))
-                throw new TypeError('"n" argument must be a positive number');
-              this._maxListeners = n;
-              return this;
-            };
-
-            function $getMaxListeners(that) {
-              if (that._maxListeners === undefined)
-                return EventEmitter.defaultMaxListeners;
-              return that._maxListeners;
-            }
-
-            EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
-              return $getMaxListeners(this);
-            };
-
-            // These standalone emit* functions are used to optimize calling of event
-            // handlers for fast cases because emit() itself often has a variable number of
-            // arguments and can be deoptimized because of that. These functions always have
-            // the same number of arguments and thus do not get deoptimized, so the code
-            // inside them can execute faster.
-            function emitNone(handler, isFn, self) {
-              if (isFn)
-                handler.call(self);
-              else {
-                var len = handler.length;
-                var listeners = arrayClone(handler, len);
-                for (var i = 0; i < len; ++i)
-                  listeners[i].call(self);
-              }
-            }
-            function emitOne(handler, isFn, self, arg1) {
-              if (isFn)
-                handler.call(self, arg1);
-              else {
-                var len = handler.length;
-                var listeners = arrayClone(handler, len);
-                for (var i = 0; i < len; ++i)
-                  listeners[i].call(self, arg1);
-              }
-            }
-            function emitTwo(handler, isFn, self, arg1, arg2) {
-              if (isFn)
-                handler.call(self, arg1, arg2);
-              else {
-                var len = handler.length;
-                var listeners = arrayClone(handler, len);
-                for (var i = 0; i < len; ++i)
-                  listeners[i].call(self, arg1, arg2);
-              }
-            }
-            function emitThree(handler, isFn, self, arg1, arg2, arg3) {
-              if (isFn)
-                handler.call(self, arg1, arg2, arg3);
-              else {
-                var len = handler.length;
-                var listeners = arrayClone(handler, len);
-                for (var i = 0; i < len; ++i)
-                  listeners[i].call(self, arg1, arg2, arg3);
-              }
-            }
-
-            function emitMany(handler, isFn, self, args) {
-              if (isFn)
-                handler.apply(self, args);
-              else {
-                var len = handler.length;
-                var listeners = arrayClone(handler, len);
-                for (var i = 0; i < len; ++i)
-                  listeners[i].apply(self, args);
-              }
-            }
-
-            EventEmitter.prototype.emit = function emit(type) {
-              var er, handler, len, args, i, events, domain;
-              var doError = (type === 'error');
-
-              events = this._events;
-              if (events)
-                doError = (doError && events.error == null);
-              else if (!doError)
-                return false;
-
-              domain = this.domain;
-
-              // If there is no 'error' event listener then throw.
-              if (doError) {
-                er = arguments[1];
-                if (domain) {
-                  if (!er)
-                    er = new Error('Uncaught, unspecified "error" event');
-                  er.domainEmitter = this;
-                  er.domain = domain;
-                  er.domainThrown = false;
-                  domain.emit('error', er);
-                } else if (er instanceof Error) {
-                  throw er; // Unhandled 'error' event
-                } else {
-                  // At least give some kind of context to the user
-                  var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
-                  err.context = er;
-                  throw err;
-                }
-                return false;
-              }
-
-              handler = events[type];
-
-              if (!handler)
-                return false;
-
-              var isFn = typeof handler === 'function';
-              len = arguments.length;
-              switch (len) {
-                // fast cases
-                case 1:
-                  emitNone(handler, isFn, this);
-                  break;
-                case 2:
-                  emitOne(handler, isFn, this, arguments[1]);
-                  break;
-                case 3:
-                  emitTwo(handler, isFn, this, arguments[1], arguments[2]);
-                  break;
-                case 4:
-                  emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
-                  break;
-                // slower
-                default:
-                  args = new Array(len - 1);
-                  for (i = 1; i < len; i++)
-                    args[i - 1] = arguments[i];
-                  emitMany(handler, isFn, this, args);
-              }
-
-              return true;
-            };
-
-            function _addListener(target, type, listener, prepend) {
-              var m;
-              var events;
-              var existing;
-
-              if (typeof listener !== 'function')
-                throw new TypeError('"listener" argument must be a function');
-
-              events = target._events;
-              if (!events) {
-                events = target._events = new EventHandlers();
-                target._eventsCount = 0;
-              } else {
-                // To avoid recursion in the case that type === "newListener"! Before
-                // adding it to the listeners, first emit "newListener".
-                if (events.newListener) {
-                  target.emit('newListener', type,
-                              listener.listener ? listener.listener : listener);
-
-                  // Re-assign `events` because a newListener handler could have caused the
-                  // this._events to be assigned to a new object
-                  events = target._events;
-                }
-                existing = events[type];
-              }
-
-              if (!existing) {
-                // Optimize the case of one listener. Don't need the extra array object.
-                existing = events[type] = listener;
-                ++target._eventsCount;
-              } else {
-                if (typeof existing === 'function') {
-                  // Adding the second element, need to change to array.
-                  existing = events[type] = prepend ? [listener, existing] :
-                                                      [existing, listener];
-                } else {
-                  // If we've already got an array, just append.
-                  if (prepend) {
-                    existing.unshift(listener);
-                  } else {
-                    existing.push(listener);
-                  }
-                }
-
-                // Check for listener leak
-                if (!existing.warned) {
-                  m = $getMaxListeners(target);
-                  if (m && m > 0 && existing.length > m) {
-                    existing.warned = true;
-                    var w = new Error('Possible EventEmitter memory leak detected. ' +
-                                        existing.length + ' ' + type + ' listeners added. ' +
-                                        'Use emitter.setMaxListeners() to increase limit');
-                    w.name = 'MaxListenersExceededWarning';
-                    w.emitter = target;
-                    w.type = type;
-                    w.count = existing.length;
-                    emitWarning(w);
-                  }
-                }
-              }
-
-              return target;
-            }
-            function emitWarning(e) {
-              typeof console.warn === 'function' ? console.warn(e) : console.log(e);
-            }
-            EventEmitter.prototype.addListener = function addListener(type, listener) {
-              return _addListener(this, type, listener, false);
-            };
-
-            EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-            EventEmitter.prototype.prependListener =
-                function prependListener(type, listener) {
-                  return _addListener(this, type, listener, true);
-                };
-
-            function _onceWrap(target, type, listener) {
-              var fired = false;
-              function g() {
-                target.removeListener(type, g);
-                if (!fired) {
-                  fired = true;
-                  listener.apply(target, arguments);
-                }
-              }
-              g.listener = listener;
-              return g;
-            }
-
-            EventEmitter.prototype.once = function once(type, listener) {
-              if (typeof listener !== 'function')
-                throw new TypeError('"listener" argument must be a function');
-              this.on(type, _onceWrap(this, type, listener));
-              return this;
-            };
-
-            EventEmitter.prototype.prependOnceListener =
-                function prependOnceListener(type, listener) {
-                  if (typeof listener !== 'function')
-                    throw new TypeError('"listener" argument must be a function');
-                  this.prependListener(type, _onceWrap(this, type, listener));
-                  return this;
-                };
-
-            // emits a 'removeListener' event iff the listener was removed
-            EventEmitter.prototype.removeListener =
-                function removeListener(type, listener) {
-                  var list, events, position, i, originalListener;
-
-                  if (typeof listener !== 'function')
-                    throw new TypeError('"listener" argument must be a function');
-
-                  events = this._events;
-                  if (!events)
-                    return this;
-
-                  list = events[type];
-                  if (!list)
-                    return this;
-
-                  if (list === listener || (list.listener && list.listener === listener)) {
-                    if (--this._eventsCount === 0)
-                      this._events = new EventHandlers();
-                    else {
-                      delete events[type];
-                      if (events.removeListener)
-                        this.emit('removeListener', type, list.listener || listener);
-                    }
-                  } else if (typeof list !== 'function') {
-                    position = -1;
-
-                    for (i = list.length; i-- > 0;) {
-                      if (list[i] === listener ||
-                          (list[i].listener && list[i].listener === listener)) {
-                        originalListener = list[i].listener;
-                        position = i;
-                        break;
-                      }
-                    }
-
-                    if (position < 0)
-                      return this;
-
-                    if (list.length === 1) {
-                      list[0] = undefined;
-                      if (--this._eventsCount === 0) {
-                        this._events = new EventHandlers();
-                        return this;
-                      } else {
-                        delete events[type];
-                      }
-                    } else {
-                      spliceOne(list, position);
-                    }
-
-                    if (events.removeListener)
-                      this.emit('removeListener', type, originalListener || listener);
-                  }
-
-                  return this;
-                };
-
-            EventEmitter.prototype.removeAllListeners =
-                function removeAllListeners(type) {
-                  var listeners, events;
-
-                  events = this._events;
-                  if (!events)
-                    return this;
-
-                  // not listening for removeListener, no need to emit
-                  if (!events.removeListener) {
-                    if (arguments.length === 0) {
-                      this._events = new EventHandlers();
-                      this._eventsCount = 0;
-                    } else if (events[type]) {
-                      if (--this._eventsCount === 0)
-                        this._events = new EventHandlers();
-                      else
-                        delete events[type];
-                    }
-                    return this;
-                  }
-
-                  // emit removeListener for all listeners on all events
-                  if (arguments.length === 0) {
-                    var keys = Object.keys(events);
-                    for (var i = 0, key; i < keys.length; ++i) {
-                      key = keys[i];
-                      if (key === 'removeListener') continue;
-                      this.removeAllListeners(key);
-                    }
-                    this.removeAllListeners('removeListener');
-                    this._events = new EventHandlers();
-                    this._eventsCount = 0;
-                    return this;
-                  }
-
-                  listeners = events[type];
-
-                  if (typeof listeners === 'function') {
-                    this.removeListener(type, listeners);
-                  } else if (listeners) {
-                    // LIFO order
-                    do {
-                      this.removeListener(type, listeners[listeners.length - 1]);
-                    } while (listeners[0]);
-                  }
-
-                  return this;
-                };
-
-            EventEmitter.prototype.listeners = function listeners(type) {
-              var evlistener;
-              var ret;
-              var events = this._events;
-
-              if (!events)
-                ret = [];
-              else {
-                evlistener = events[type];
-                if (!evlistener)
-                  ret = [];
-                else if (typeof evlistener === 'function')
-                  ret = [evlistener.listener || evlistener];
-                else
-                  ret = unwrapListeners(evlistener);
-              }
-
-              return ret;
-            };
-
-            EventEmitter.listenerCount = function(emitter, type) {
-              if (typeof emitter.listenerCount === 'function') {
-                return emitter.listenerCount(type);
-              } else {
-                return listenerCount.call(emitter, type);
-              }
-            };
-
-            EventEmitter.prototype.listenerCount = listenerCount;
-            function listenerCount(type) {
-              var events = this._events;
-
-              if (events) {
-                var evlistener = events[type];
-
-                if (typeof evlistener === 'function') {
-                  return 1;
-                } else if (evlistener) {
-                  return evlistener.length;
-                }
-              }
-
-              return 0;
-            }
-
-            EventEmitter.prototype.eventNames = function eventNames() {
-              return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
-            };
-
-            // About 1.5x faster than the two-arg version of Array#splice().
-            function spliceOne(list, index) {
-              for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
-                list[i] = list[k];
-              list.pop();
-            }
-
-            function arrayClone(arr, i) {
-              var copy = new Array(i);
-              while (i--)
-                copy[i] = arr[i];
-              return copy;
-            }
-
-            function unwrapListeners(arr) {
-              var ret = new Array(arr.length);
-              for (var i = 0; i < ret.length; ++i) {
-                ret[i] = arr[i].listener || arr[i];
-              }
-              return ret;
-            }
-
-            // shim for using process in browser
-            // based off https://github.com/defunctzombie/node-process/blob/master/browser.js
-
-            function defaultSetTimout() {
-                throw new Error('setTimeout has not been defined');
-            }
-            function defaultClearTimeout () {
-                throw new Error('clearTimeout has not been defined');
-            }
-            var cachedSetTimeout = defaultSetTimout;
-            var cachedClearTimeout = defaultClearTimeout;
-            if (typeof global$1.setTimeout === 'function') {
-                cachedSetTimeout = setTimeout;
-            }
-            if (typeof global$1.clearTimeout === 'function') {
-                cachedClearTimeout = clearTimeout;
-            }
-
-            function runTimeout(fun) {
-                if (cachedSetTimeout === setTimeout) {
-                    //normal enviroments in sane situations
-                    return setTimeout(fun, 0);
-                }
-                // if setTimeout wasn't available but was latter defined
-                if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-                    cachedSetTimeout = setTimeout;
-                    return setTimeout(fun, 0);
-                }
-                try {
-                    // when when somebody has screwed with setTimeout but no I.E. maddness
-                    return cachedSetTimeout(fun, 0);
-                } catch(e){
-                    try {
-                        // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-                        return cachedSetTimeout.call(null, fun, 0);
-                    } catch(e){
-                        // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-                        return cachedSetTimeout.call(this, fun, 0);
-                    }
-                }
-
-
-            }
-            function runClearTimeout(marker) {
-                if (cachedClearTimeout === clearTimeout) {
-                    //normal enviroments in sane situations
-                    return clearTimeout(marker);
-                }
-                // if clearTimeout wasn't available but was latter defined
-                if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-                    cachedClearTimeout = clearTimeout;
-                    return clearTimeout(marker);
-                }
-                try {
-                    // when when somebody has screwed with setTimeout but no I.E. maddness
-                    return cachedClearTimeout(marker);
-                } catch (e){
-                    try {
-                        // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-                        return cachedClearTimeout.call(null, marker);
-                    } catch (e){
-                        // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-                        // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-                        return cachedClearTimeout.call(this, marker);
-                    }
-                }
-
-
-
-            }
-            var queue = [];
-            var draining = false;
-            var currentQueue;
-            var queueIndex = -1;
-
-            function cleanUpNextTick() {
-                if (!draining || !currentQueue) {
-                    return;
-                }
-                draining = false;
-                if (currentQueue.length) {
-                    queue = currentQueue.concat(queue);
-                } else {
-                    queueIndex = -1;
-                }
-                if (queue.length) {
-                    drainQueue();
-                }
-            }
-
-            function drainQueue() {
-                if (draining) {
-                    return;
-                }
-                var timeout = runTimeout(cleanUpNextTick);
-                draining = true;
-
-                var len = queue.length;
-                while(len) {
-                    currentQueue = queue;
-                    queue = [];
-                    while (++queueIndex < len) {
-                        if (currentQueue) {
-                            currentQueue[queueIndex].run();
-                        }
-                    }
-                    queueIndex = -1;
-                    len = queue.length;
-                }
-                currentQueue = null;
-                draining = false;
-                runClearTimeout(timeout);
-            }
-            function nextTick(fun) {
-                var args = new Array(arguments.length - 1);
-                if (arguments.length > 1) {
-                    for (var i = 1; i < arguments.length; i++) {
-                        args[i - 1] = arguments[i];
-                    }
-                }
-                queue.push(new Item(fun, args));
-                if (queue.length === 1 && !draining) {
-                    runTimeout(drainQueue);
-                }
-            }
-            // v8 likes predictible objects
-            function Item(fun, array) {
-                this.fun = fun;
-                this.array = array;
-            }
-            Item.prototype.run = function () {
-                this.fun.apply(null, this.array);
-            };
-            var title = 'browser';
-            var platform = 'browser';
-            var browser = true;
-            var env = {};
-            var argv = [];
-            var version = ''; // empty string to avoid regexp issues
-            var versions = {};
-            var release = {};
-            var config = {};
-
-            function noop() {}
-
-            var on = noop;
-            var addListener = noop;
-            var once = noop;
-            var off = noop;
-            var removeListener = noop;
-            var removeAllListeners = noop;
-            var emit = noop;
-
-            function binding(name) {
-                throw new Error('process.binding is not supported');
-            }
-
-            function cwd () { return '/' }
-            function chdir (dir) {
-                throw new Error('process.chdir is not supported');
-            }function umask() { return 0; }
-
-            // from https://github.com/kumavis/browser-process-hrtime/blob/master/index.js
-            var performance = global$1.performance || {};
-            var performanceNow =
-              performance.now        ||
-              performance.mozNow     ||
-              performance.msNow      ||
-              performance.oNow       ||
-              performance.webkitNow  ||
-              function(){ return (new Date()).getTime() };
-
-            // generate timestamp or delta
-            // see http://nodejs.org/api/process.html#process_process_hrtime
-            function hrtime(previousTimestamp){
-              var clocktime = performanceNow.call(performance)*1e-3;
-              var seconds = Math.floor(clocktime);
-              var nanoseconds = Math.floor((clocktime%1)*1e9);
-              if (previousTimestamp) {
-                seconds = seconds - previousTimestamp[0];
-                nanoseconds = nanoseconds - previousTimestamp[1];
-                if (nanoseconds<0) {
-                  seconds--;
-                  nanoseconds += 1e9;
-                }
-              }
-              return [seconds,nanoseconds]
-            }
-
-            var startTime = new Date();
-            function uptime() {
-              var currentTime = new Date();
-              var dif = currentTime - startTime;
-              return dif / 1000;
-            }
-
-            var process = {
-              nextTick: nextTick,
-              title: title,
-              browser: browser,
-              env: env,
-              argv: argv,
-              version: version,
-              versions: versions,
-              on: on,
-              addListener: addListener,
-              once: once,
-              off: off,
-              removeListener: removeListener,
-              removeAllListeners: removeAllListeners,
-              emit: emit,
-              binding: binding,
-              cwd: cwd,
-              chdir: chdir,
-              umask: umask,
-              hrtime: hrtime,
-              platform: platform,
-              release: release,
-              config: config,
-              uptime: uptime
-            };
-
-            var inherits;
-            if (typeof Object.create === 'function'){
-              inherits = function inherits(ctor, superCtor) {
-                // implementation from standard node.js 'util' module
-                ctor.super_ = superCtor;
-                ctor.prototype = Object.create(superCtor.prototype, {
-                  constructor: {
-                    value: ctor,
-                    enumerable: false,
-                    writable: true,
-                    configurable: true
-                  }
-                });
-              };
-            } else {
-              inherits = function inherits(ctor, superCtor) {
-                ctor.super_ = superCtor;
-                var TempCtor = function () {};
-                TempCtor.prototype = superCtor.prototype;
-                ctor.prototype = new TempCtor();
-                ctor.prototype.constructor = ctor;
-              };
-            }
-            var inherits$1 = inherits;
-
-            var formatRegExp = /%[sdj%]/g;
-            function format(f) {
-              if (!isString(f)) {
-                var objects = [];
-                for (var i = 0; i < arguments.length; i++) {
-                  objects.push(inspect(arguments[i]));
-                }
-                return objects.join(' ');
-              }
-
-              var i = 1;
-              var args = arguments;
-              var len = args.length;
-              var str = String(f).replace(formatRegExp, function(x) {
-                if (x === '%%') return '%';
-                if (i >= len) return x;
-                switch (x) {
-                  case '%s': return String(args[i++]);
-                  case '%d': return Number(args[i++]);
-                  case '%j':
-                    try {
-                      return JSON.stringify(args[i++]);
-                    } catch (_) {
-                      return '[Circular]';
-                    }
-                  default:
-                    return x;
-                }
-              });
-              for (var x = args[i]; i < len; x = args[++i]) {
-                if (isNull(x) || !isObject(x)) {
-                  str += ' ' + x;
-                } else {
-                  str += ' ' + inspect(x);
-                }
-              }
-              return str;
-            }
-
-            // Mark that a method should not be used.
-            // Returns a modified function which warns once by default.
-            // If --no-deprecation is set, then it is a no-op.
-            function deprecate(fn, msg) {
-              // Allow for deprecating things in the process of starting up.
-              if (isUndefined(global$1.process)) {
-                return function() {
-                  return deprecate(fn, msg).apply(this, arguments);
-                };
-              }
-
-              var warned = false;
-              function deprecated() {
-                if (!warned) {
-                  {
-                    console.error(msg);
-                  }
-                  warned = true;
-                }
-                return fn.apply(this, arguments);
-              }
-
-              return deprecated;
-            }
-
-            var debugs = {};
-            var debugEnviron;
-            function debuglog(set) {
-              if (isUndefined(debugEnviron))
-                debugEnviron = process.env.NODE_DEBUG || '';
-              set = set.toUpperCase();
-              if (!debugs[set]) {
-                if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
-                  var pid = 0;
-                  debugs[set] = function() {
-                    var msg = format.apply(null, arguments);
-                    console.error('%s %d: %s', set, pid, msg);
-                  };
-                } else {
-                  debugs[set] = function() {};
-                }
-              }
-              return debugs[set];
-            }
-
-            /**
-             * Echos the value of a value. Trys to print the value out
-             * in the best way possible given the different types.
-             *
-             * @param {Object} obj The object to print out.
-             * @param {Object} opts Optional options object that alters the output.
-             */
-            /* legacy: obj, showHidden, depth, colors*/
-            function inspect(obj, opts) {
-              // default options
-              var ctx = {
-                seen: [],
-                stylize: stylizeNoColor
-              };
-              // legacy...
-              if (arguments.length >= 3) ctx.depth = arguments[2];
-              if (arguments.length >= 4) ctx.colors = arguments[3];
-              if (isBoolean(opts)) {
-                // legacy...
-                ctx.showHidden = opts;
-              } else if (opts) {
-                // got an "options" object
-                _extend(ctx, opts);
-              }
-              // set default options
-              if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-              if (isUndefined(ctx.depth)) ctx.depth = 2;
-              if (isUndefined(ctx.colors)) ctx.colors = false;
-              if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-              if (ctx.colors) ctx.stylize = stylizeWithColor;
-              return formatValue(ctx, obj, ctx.depth);
-            }
-
-            // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-            inspect.colors = {
-              'bold' : [1, 22],
-              'italic' : [3, 23],
-              'underline' : [4, 24],
-              'inverse' : [7, 27],
-              'white' : [37, 39],
-              'grey' : [90, 39],
-              'black' : [30, 39],
-              'blue' : [34, 39],
-              'cyan' : [36, 39],
-              'green' : [32, 39],
-              'magenta' : [35, 39],
-              'red' : [31, 39],
-              'yellow' : [33, 39]
-            };
-
-            // Don't use 'blue' not visible on cmd.exe
-            inspect.styles = {
-              'special': 'cyan',
-              'number': 'yellow',
-              'boolean': 'yellow',
-              'undefined': 'grey',
-              'null': 'bold',
-              'string': 'green',
-              'date': 'magenta',
-              // "name": intentionally not styling
-              'regexp': 'red'
-            };
-
-
-            function stylizeWithColor(str, styleType) {
-              var style = inspect.styles[styleType];
-
-              if (style) {
-                return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-                       '\u001b[' + inspect.colors[style][1] + 'm';
-              } else {
-                return str;
-              }
-            }
-
-
-            function stylizeNoColor(str, styleType) {
-              return str;
-            }
-
-
-            function arrayToHash(array) {
-              var hash = {};
-
-              array.forEach(function(val, idx) {
-                hash[val] = true;
-              });
-
-              return hash;
-            }
-
-
-            function formatValue(ctx, value, recurseTimes) {
-              // Provide a hook for user-specified inspect functions.
-              // Check that value is an object with an inspect function on it
-              if (ctx.customInspect &&
-                  value &&
-                  isFunction(value.inspect) &&
-                  // Filter out the util module, it's inspect function is special
-                  value.inspect !== inspect &&
-                  // Also filter out any prototype objects using the circular check.
-                  !(value.constructor && value.constructor.prototype === value)) {
-                var ret = value.inspect(recurseTimes, ctx);
-                if (!isString(ret)) {
-                  ret = formatValue(ctx, ret, recurseTimes);
-                }
-                return ret;
-              }
-
-              // Primitive types cannot have properties
-              var primitive = formatPrimitive(ctx, value);
-              if (primitive) {
-                return primitive;
-              }
-
-              // Look up the keys of the object.
-              var keys = Object.keys(value);
-              var visibleKeys = arrayToHash(keys);
-
-              if (ctx.showHidden) {
-                keys = Object.getOwnPropertyNames(value);
-              }
-
-              // IE doesn't make error fields non-enumerable
-              // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-              if (isError(value)
-                  && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-                return formatError(value);
-              }
-
-              // Some type of object without properties can be shortcutted.
-              if (keys.length === 0) {
-                if (isFunction(value)) {
-                  var name = value.name ? ': ' + value.name : '';
-                  return ctx.stylize('[Function' + name + ']', 'special');
-                }
-                if (isRegExp(value)) {
-                  return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-                }
-                if (isDate(value)) {
-                  return ctx.stylize(Date.prototype.toString.call(value), 'date');
-                }
-                if (isError(value)) {
-                  return formatError(value);
-                }
-              }
-
-              var base = '', array = false, braces = ['{', '}'];
-
-              // Make Array say that they are Array
-              if (isArray$1(value)) {
-                array = true;
-                braces = ['[', ']'];
-              }
-
-              // Make functions say that they are functions
-              if (isFunction(value)) {
-                var n = value.name ? ': ' + value.name : '';
-                base = ' [Function' + n + ']';
-              }
-
-              // Make RegExps say that they are RegExps
-              if (isRegExp(value)) {
-                base = ' ' + RegExp.prototype.toString.call(value);
-              }
-
-              // Make dates with properties first say the date
-              if (isDate(value)) {
-                base = ' ' + Date.prototype.toUTCString.call(value);
-              }
-
-              // Make error with message first say the error
-              if (isError(value)) {
-                base = ' ' + formatError(value);
-              }
-
-              if (keys.length === 0 && (!array || value.length == 0)) {
-                return braces[0] + base + braces[1];
-              }
-
-              if (recurseTimes < 0) {
-                if (isRegExp(value)) {
-                  return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-                } else {
-                  return ctx.stylize('[Object]', 'special');
-                }
-              }
-
-              ctx.seen.push(value);
-
-              var output;
-              if (array) {
-                output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-              } else {
-                output = keys.map(function(key) {
-                  return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-                });
-              }
-
-              ctx.seen.pop();
-
-              return reduceToSingleString(output, base, braces);
-            }
-
-
-            function formatPrimitive(ctx, value) {
-              if (isUndefined(value))
-                return ctx.stylize('undefined', 'undefined');
-              if (isString(value)) {
-                var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-                                                         .replace(/'/g, "\\'")
-                                                         .replace(/\\"/g, '"') + '\'';
-                return ctx.stylize(simple, 'string');
-              }
-              if (isNumber(value))
-                return ctx.stylize('' + value, 'number');
-              if (isBoolean(value))
-                return ctx.stylize('' + value, 'boolean');
-              // For some reason typeof null is "object", so special case here.
-              if (isNull(value))
-                return ctx.stylize('null', 'null');
-            }
-
-
-            function formatError(value) {
-              return '[' + Error.prototype.toString.call(value) + ']';
-            }
-
-
-            function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-              var output = [];
-              for (var i = 0, l = value.length; i < l; ++i) {
-                if (hasOwnProperty$1(value, String(i))) {
-                  output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-                      String(i), true));
-                } else {
-                  output.push('');
-                }
-              }
-              keys.forEach(function(key) {
-                if (!key.match(/^\d+$/)) {
-                  output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-                      key, true));
-                }
-              });
-              return output;
-            }
-
-
-            function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-              var name, str, desc;
-              desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-              if (desc.get) {
-                if (desc.set) {
-                  str = ctx.stylize('[Getter/Setter]', 'special');
-                } else {
-                  str = ctx.stylize('[Getter]', 'special');
-                }
-              } else {
-                if (desc.set) {
-                  str = ctx.stylize('[Setter]', 'special');
-                }
-              }
-              if (!hasOwnProperty$1(visibleKeys, key)) {
-                name = '[' + key + ']';
-              }
-              if (!str) {
-                if (ctx.seen.indexOf(desc.value) < 0) {
-                  if (isNull(recurseTimes)) {
-                    str = formatValue(ctx, desc.value, null);
-                  } else {
-                    str = formatValue(ctx, desc.value, recurseTimes - 1);
-                  }
-                  if (str.indexOf('\n') > -1) {
-                    if (array) {
-                      str = str.split('\n').map(function(line) {
-                        return '  ' + line;
-                      }).join('\n').substr(2);
-                    } else {
-                      str = '\n' + str.split('\n').map(function(line) {
-                        return '   ' + line;
-                      }).join('\n');
-                    }
-                  }
-                } else {
-                  str = ctx.stylize('[Circular]', 'special');
-                }
-              }
-              if (isUndefined(name)) {
-                if (array && key.match(/^\d+$/)) {
-                  return str;
-                }
-                name = JSON.stringify('' + key);
-                if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-                  name = name.substr(1, name.length - 2);
-                  name = ctx.stylize(name, 'name');
-                } else {
-                  name = name.replace(/'/g, "\\'")
-                             .replace(/\\"/g, '"')
-                             .replace(/(^"|"$)/g, "'");
-                  name = ctx.stylize(name, 'string');
-                }
-              }
-
-              return name + ': ' + str;
-            }
-
-
-            function reduceToSingleString(output, base, braces) {
-              var length = output.reduce(function(prev, cur) {
-                if (cur.indexOf('\n') >= 0) ;
-                return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-              }, 0);
-
-              if (length > 60) {
-                return braces[0] +
-                       (base === '' ? '' : base + '\n ') +
-                       ' ' +
-                       output.join(',\n  ') +
-                       ' ' +
-                       braces[1];
-              }
-
-              return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
-            }
-
-
-            // NOTE: These type checking functions intentionally don't use `instanceof`
-            // because it is fragile and can be easily faked with `Object.create()`.
-            function isArray$1(ar) {
-              return Array.isArray(ar);
-            }
-
-            function isBoolean(arg) {
-              return typeof arg === 'boolean';
-            }
-
-            function isNull(arg) {
-              return arg === null;
-            }
-
-            function isNumber(arg) {
-              return typeof arg === 'number';
-            }
-
-            function isString(arg) {
-              return typeof arg === 'string';
-            }
-
-            function isUndefined(arg) {
-              return arg === void 0;
-            }
-
-            function isRegExp(re) {
-              return isObject(re) && objectToString(re) === '[object RegExp]';
-            }
-
-            function isObject(arg) {
-              return typeof arg === 'object' && arg !== null;
-            }
-
-            function isDate(d) {
-              return isObject(d) && objectToString(d) === '[object Date]';
-            }
-
-            function isError(e) {
-              return isObject(e) &&
-                  (objectToString(e) === '[object Error]' || e instanceof Error);
-            }
-
-            function isFunction(arg) {
-              return typeof arg === 'function';
-            }
-
-            function objectToString(o) {
-              return Object.prototype.toString.call(o);
-            }
-
-            function _extend(origin, add) {
-              // Don't do anything if add isn't an object
-              if (!add || !isObject(add)) return origin;
-
-              var keys = Object.keys(add);
-              var i = keys.length;
-              while (i--) {
-                origin[keys[i]] = add[keys[i]];
-              }
-              return origin;
-            }
-            function hasOwnProperty$1(obj, prop) {
-              return Object.prototype.hasOwnProperty.call(obj, prop);
-            }
-
-            function BufferList() {
-              this.head = null;
-              this.tail = null;
-              this.length = 0;
-            }
-
-            BufferList.prototype.push = function (v) {
-              var entry = { data: v, next: null };
-              if (this.length > 0) this.tail.next = entry;else this.head = entry;
-              this.tail = entry;
-              ++this.length;
-            };
-
-            BufferList.prototype.unshift = function (v) {
-              var entry = { data: v, next: this.head };
-              if (this.length === 0) this.tail = entry;
-              this.head = entry;
-              ++this.length;
-            };
-
-            BufferList.prototype.shift = function () {
-              if (this.length === 0) return;
-              var ret = this.head.data;
-              if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-              --this.length;
-              return ret;
-            };
-
-            BufferList.prototype.clear = function () {
-              this.head = this.tail = null;
-              this.length = 0;
-            };
-
-            BufferList.prototype.join = function (s) {
-              if (this.length === 0) return '';
-              var p = this.head;
-              var ret = '' + p.data;
-              while (p = p.next) {
-                ret += s + p.data;
-              }return ret;
-            };
-
-            BufferList.prototype.concat = function (n) {
-              if (this.length === 0) return Buffer.alloc(0);
-              if (this.length === 1) return this.head.data;
-              var ret = Buffer.allocUnsafe(n >>> 0);
-              var p = this.head;
-              var i = 0;
-              while (p) {
-                p.data.copy(ret, i);
-                i += p.data.length;
-                p = p.next;
-              }
-              return ret;
-            };
-
-            // Copyright Joyent, Inc. and other Node contributors.
-            var isBufferEncoding = Buffer.isEncoding
-              || function(encoding) {
-                   switch (encoding && encoding.toLowerCase()) {
-                     case 'hex': case 'utf8': case 'utf-8': case 'ascii': case 'binary': case 'base64': case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': case 'raw': return true;
-                     default: return false;
-                   }
-                 };
-
-
-            function assertEncoding(encoding) {
-              if (encoding && !isBufferEncoding(encoding)) {
-                throw new Error('Unknown encoding: ' + encoding);
-              }
-            }
-
-            // StringDecoder provides an interface for efficiently splitting a series of
-            // buffers into a series of JS strings without breaking apart multi-byte
-            // characters. CESU-8 is handled as part of the UTF-8 encoding.
-            //
-            // @TODO Handling all encodings inside a single object makes it very difficult
-            // to reason about this code, so it should be split up in the future.
-            // @TODO There should be a utf8-strict encoding that rejects invalid UTF-8 code
-            // points as used by CESU-8.
-            function StringDecoder(encoding) {
-              this.encoding = (encoding || 'utf8').toLowerCase().replace(/[-_]/, '');
-              assertEncoding(encoding);
-              switch (this.encoding) {
-                case 'utf8':
-                  // CESU-8 represents each of Surrogate Pair by 3-bytes
-                  this.surrogateSize = 3;
-                  break;
-                case 'ucs2':
-                case 'utf16le':
-                  // UTF-16 represents each of Surrogate Pair by 2-bytes
-                  this.surrogateSize = 2;
-                  this.detectIncompleteChar = utf16DetectIncompleteChar;
-                  break;
-                case 'base64':
-                  // Base-64 stores 3 bytes in 4 chars, and pads the remainder.
-                  this.surrogateSize = 3;
-                  this.detectIncompleteChar = base64DetectIncompleteChar;
-                  break;
-                default:
-                  this.write = passThroughWrite;
-                  return;
-              }
-
-              // Enough space to store all bytes of a single character. UTF-8 needs 4
-              // bytes, but CESU-8 may require up to 6 (3 bytes per surrogate).
-              this.charBuffer = new Buffer(6);
-              // Number of bytes received for the current incomplete multi-byte character.
-              this.charReceived = 0;
-              // Number of bytes expected for the current incomplete multi-byte character.
-              this.charLength = 0;
-            }
-
-            // write decodes the given buffer and returns it as JS string that is
-            // guaranteed to not contain any partial multi-byte characters. Any partial
-            // character found at the end of the buffer is buffered up, and will be
-            // returned when calling write again with the remaining bytes.
-            //
-            // Note: Converting a Buffer containing an orphan surrogate to a String
-            // currently works, but converting a String to a Buffer (via `new Buffer`, or
-            // Buffer#write) will replace incomplete surrogates with the unicode
-            // replacement character. See https://codereview.chromium.org/121173009/ .
-            StringDecoder.prototype.write = function(buffer) {
-              var charStr = '';
-              // if our last write ended with an incomplete multibyte character
-              while (this.charLength) {
-                // determine how many remaining bytes this buffer has to offer for this char
-                var available = (buffer.length >= this.charLength - this.charReceived) ?
-                    this.charLength - this.charReceived :
-                    buffer.length;
-
-                // add the new bytes to the char buffer
-                buffer.copy(this.charBuffer, this.charReceived, 0, available);
-                this.charReceived += available;
-
-                if (this.charReceived < this.charLength) {
-                  // still not enough chars in this buffer? wait for more ...
-                  return '';
-                }
-
-                // remove bytes belonging to the current character from the buffer
-                buffer = buffer.slice(available, buffer.length);
-
-                // get the character that was split
-                charStr = this.charBuffer.slice(0, this.charLength).toString(this.encoding);
-
-                // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-                var charCode = charStr.charCodeAt(charStr.length - 1);
-                if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-                  this.charLength += this.surrogateSize;
-                  charStr = '';
-                  continue;
-                }
-                this.charReceived = this.charLength = 0;
-
-                // if there are no more bytes in this buffer, just emit our char
-                if (buffer.length === 0) {
-                  return charStr;
-                }
-                break;
-              }
-
-              // determine and set charLength / charReceived
-              this.detectIncompleteChar(buffer);
-
-              var end = buffer.length;
-              if (this.charLength) {
-                // buffer the incomplete character bytes we got
-                buffer.copy(this.charBuffer, 0, buffer.length - this.charReceived, end);
-                end -= this.charReceived;
-              }
-
-              charStr += buffer.toString(this.encoding, 0, end);
-
-              var end = charStr.length - 1;
-              var charCode = charStr.charCodeAt(end);
-              // CESU-8: lead surrogate (D800-DBFF) is also the incomplete character
-              if (charCode >= 0xD800 && charCode <= 0xDBFF) {
-                var size = this.surrogateSize;
-                this.charLength += size;
-                this.charReceived += size;
-                this.charBuffer.copy(this.charBuffer, size, 0, size);
-                buffer.copy(this.charBuffer, 0, 0, size);
-                return charStr.substring(0, end);
-              }
-
-              // or just emit the charStr
-              return charStr;
-            };
-
-            // detectIncompleteChar determines if there is an incomplete UTF-8 character at
-            // the end of the given buffer. If so, it sets this.charLength to the byte
-            // length that character, and sets this.charReceived to the number of bytes
-            // that are available for this character.
-            StringDecoder.prototype.detectIncompleteChar = function(buffer) {
-              // determine how many bytes we have to check at the end of this buffer
-              var i = (buffer.length >= 3) ? 3 : buffer.length;
-
-              // Figure out if one of the last i bytes of our buffer announces an
-              // incomplete char.
-              for (; i > 0; i--) {
-                var c = buffer[buffer.length - i];
-
-                // See http://en.wikipedia.org/wiki/UTF-8#Description
-
-                // 110XXXXX
-                if (i == 1 && c >> 5 == 0x06) {
-                  this.charLength = 2;
-                  break;
-                }
-
-                // 1110XXXX
-                if (i <= 2 && c >> 4 == 0x0E) {
-                  this.charLength = 3;
-                  break;
-                }
-
-                // 11110XXX
-                if (i <= 3 && c >> 3 == 0x1E) {
-                  this.charLength = 4;
-                  break;
-                }
-              }
-              this.charReceived = i;
-            };
-
-            StringDecoder.prototype.end = function(buffer) {
-              var res = '';
-              if (buffer && buffer.length)
-                res = this.write(buffer);
-
-              if (this.charReceived) {
-                var cr = this.charReceived;
-                var buf = this.charBuffer;
-                var enc = this.encoding;
-                res += buf.slice(0, cr).toString(enc);
-              }
-
-              return res;
-            };
-
-            function passThroughWrite(buffer) {
-              return buffer.toString(this.encoding);
-            }
-
-            function utf16DetectIncompleteChar(buffer) {
-              this.charReceived = buffer.length % 2;
-              this.charLength = this.charReceived ? 2 : 0;
-            }
-
-            function base64DetectIncompleteChar(buffer) {
-              this.charReceived = buffer.length % 3;
-              this.charLength = this.charReceived ? 3 : 0;
-            }
-
-            Readable.ReadableState = ReadableState;
-
-            var debug = debuglog('stream');
-            inherits$1(Readable, EventEmitter);
-
-            function prependListener(emitter, event, fn) {
-              // Sadly this is not cacheable as some libraries bundle their own
-              // event emitter implementation with them.
-              if (typeof emitter.prependListener === 'function') {
-                return emitter.prependListener(event, fn);
-              } else {
-                // This is a hack to make sure that our error handler is attached before any
-                // userland ones.  NEVER DO THIS. This is here only because this code needs
-                // to continue to work with older versions of Node.js that do not include
-                // the prependListener() method. The goal is to eventually remove this hack.
-                if (!emitter._events || !emitter._events[event])
-                  emitter.on(event, fn);
-                else if (Array.isArray(emitter._events[event]))
-                  emitter._events[event].unshift(fn);
-                else
-                  emitter._events[event] = [fn, emitter._events[event]];
-              }
-            }
-            function listenerCount$1 (emitter, type) {
-              return emitter.listeners(type).length;
-            }
-            function ReadableState(options, stream) {
-
-              options = options || {};
-
-              // object stream flag. Used to make read(n) ignore n and to
-              // make all the buffer merging and length checks go away
-              this.objectMode = !!options.objectMode;
-
-              if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-              // the point at which it stops calling _read() to fill the buffer
-              // Note: 0 is a valid value, means "don't call _read preemptively ever"
-              var hwm = options.highWaterMark;
-              var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-              this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-              // cast to ints.
-              this.highWaterMark = ~ ~this.highWaterMark;
-
-              // A linked list is used to store data chunks instead of an array because the
-              // linked list can remove elements from the beginning faster than
-              // array.shift()
-              this.buffer = new BufferList();
-              this.length = 0;
-              this.pipes = null;
-              this.pipesCount = 0;
-              this.flowing = null;
-              this.ended = false;
-              this.endEmitted = false;
-              this.reading = false;
-
-              // a flag to be able to tell if the onwrite cb is called immediately,
-              // or on a later tick.  We set this to true at first, because any
-              // actions that shouldn't happen until "later" should generally also
-              // not happen before the first write call.
-              this.sync = true;
-
-              // whenever we return null, then we set a flag to say
-              // that we're awaiting a 'readable' event emission.
-              this.needReadable = false;
-              this.emittedReadable = false;
-              this.readableListening = false;
-              this.resumeScheduled = false;
-
-              // Crypto is kind of old and crusty.  Historically, its default string
-              // encoding is 'binary' so we have to make this configurable.
-              // Everything else in the universe uses 'utf8', though.
-              this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-              // when piping, we only care about 'readable' events that happen
-              // after read()ing all the bytes and not getting any pushback.
-              this.ranOut = false;
-
-              // the number of writers that are awaiting a drain event in .pipe()s
-              this.awaitDrain = 0;
-
-              // if true, a maybeReadMore has been scheduled
-              this.readingMore = false;
-
-              this.decoder = null;
-              this.encoding = null;
-              if (options.encoding) {
-                this.decoder = new StringDecoder(options.encoding);
-                this.encoding = options.encoding;
-              }
-            }
-            function Readable(options) {
-
-              if (!(this instanceof Readable)) return new Readable(options);
-
-              this._readableState = new ReadableState(options, this);
-
-              // legacy
-              this.readable = true;
-
-              if (options && typeof options.read === 'function') this._read = options.read;
-
-              EventEmitter.call(this);
-            }
-
-            // Manually shove something into the read() buffer.
-            // This returns true if the highWaterMark has not been hit yet,
-            // similar to how Writable.write() returns true if you should
-            // write() some more.
-            Readable.prototype.push = function (chunk, encoding) {
-              var state = this._readableState;
-
-              if (!state.objectMode && typeof chunk === 'string') {
-                encoding = encoding || state.defaultEncoding;
-                if (encoding !== state.encoding) {
-                  chunk = Buffer.from(chunk, encoding);
-                  encoding = '';
-                }
-              }
-
-              return readableAddChunk(this, state, chunk, encoding, false);
-            };
-
-            // Unshift should *always* be something directly out of read()
-            Readable.prototype.unshift = function (chunk) {
-              var state = this._readableState;
-              return readableAddChunk(this, state, chunk, '', true);
-            };
-
-            Readable.prototype.isPaused = function () {
-              return this._readableState.flowing === false;
-            };
-
-            function readableAddChunk(stream, state, chunk, encoding, addToFront) {
-              var er = chunkInvalid(state, chunk);
-              if (er) {
-                stream.emit('error', er);
-              } else if (chunk === null) {
-                state.reading = false;
-                onEofChunk(stream, state);
-              } else if (state.objectMode || chunk && chunk.length > 0) {
-                if (state.ended && !addToFront) {
-                  var e = new Error('stream.push() after EOF');
-                  stream.emit('error', e);
-                } else if (state.endEmitted && addToFront) {
-                  var _e = new Error('stream.unshift() after end event');
-                  stream.emit('error', _e);
-                } else {
-                  var skipAdd;
-                  if (state.decoder && !addToFront && !encoding) {
-                    chunk = state.decoder.write(chunk);
-                    skipAdd = !state.objectMode && chunk.length === 0;
-                  }
-
-                  if (!addToFront) state.reading = false;
-
-                  // Don't add to the buffer if we've decoded to an empty string chunk and
-                  // we're not in object mode
-                  if (!skipAdd) {
-                    // if we want the data now, just emit it.
-                    if (state.flowing && state.length === 0 && !state.sync) {
-                      stream.emit('data', chunk);
-                      stream.read(0);
-                    } else {
-                      // update the buffer info.
-                      state.length += state.objectMode ? 1 : chunk.length;
-                      if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-                      if (state.needReadable) emitReadable(stream);
-                    }
-                  }
-
-                  maybeReadMore(stream, state);
-                }
-              } else if (!addToFront) {
-                state.reading = false;
-              }
-
-              return needMoreData(state);
-            }
-
-            // if it's past the high water mark, we can push in some more.
-            // Also, if we have no data yet, we can stand some
-            // more bytes.  This is to work around cases where hwm=0,
-            // such as the repl.  Also, if the push() triggered a
-            // readable event, and the user called read(largeNumber) such that
-            // needReadable was set, then we ought to push more, so that another
-            // 'readable' event will be triggered.
-            function needMoreData(state) {
-              return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-            }
-
-            // backwards compatibility.
-            Readable.prototype.setEncoding = function (enc) {
-              this._readableState.decoder = new StringDecoder(enc);
-              this._readableState.encoding = enc;
-              return this;
-            };
-
-            // Don't raise the hwm > 8MB
-            var MAX_HWM = 0x800000;
-            function computeNewHighWaterMark(n) {
-              if (n >= MAX_HWM) {
-                n = MAX_HWM;
-              } else {
-                // Get the next highest power of 2 to prevent increasing hwm excessively in
-                // tiny amounts
-                n--;
-                n |= n >>> 1;
-                n |= n >>> 2;
-                n |= n >>> 4;
-                n |= n >>> 8;
-                n |= n >>> 16;
-                n++;
-              }
-              return n;
-            }
-
-            // This function is designed to be inlinable, so please take care when making
-            // changes to the function body.
-            function howMuchToRead(n, state) {
-              if (n <= 0 || state.length === 0 && state.ended) return 0;
-              if (state.objectMode) return 1;
-              if (n !== n) {
-                // Only flow one buffer at a time
-                if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
-              }
-              // If we're asking for more than the current hwm, then raise the hwm.
-              if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-              if (n <= state.length) return n;
-              // Don't have enough
-              if (!state.ended) {
-                state.needReadable = true;
-                return 0;
-              }
-              return state.length;
-            }
-
-            // you can override either this method, or the async _read(n) below.
-            Readable.prototype.read = function (n) {
-              debug('read', n);
-              n = parseInt(n, 10);
-              var state = this._readableState;
-              var nOrig = n;
-
-              if (n !== 0) state.emittedReadable = false;
-
-              // if we're doing read(0) to trigger a readable event, but we
-              // already have a bunch of data in the buffer, then just trigger
-              // the 'readable' event and move on.
-              if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-                debug('read: emitReadable', state.length, state.ended);
-                if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-                return null;
-              }
-
-              n = howMuchToRead(n, state);
-
-              // if we've ended, and we're now clear, then finish it up.
-              if (n === 0 && state.ended) {
-                if (state.length === 0) endReadable(this);
-                return null;
-              }
-
-              // All the actual chunk generation logic needs to be
-              // *below* the call to _read.  The reason is that in certain
-              // synthetic stream cases, such as passthrough streams, _read
-              // may be a completely synchronous operation which may change
-              // the state of the read buffer, providing enough data when
-              // before there was *not* enough.
-              //
-              // So, the steps are:
-              // 1. Figure out what the state of things will be after we do
-              // a read from the buffer.
-              //
-              // 2. If that resulting state will trigger a _read, then call _read.
-              // Note that this may be asynchronous, or synchronous.  Yes, it is
-              // deeply ugly to write APIs this way, but that still doesn't mean
-              // that the Readable class should behave improperly, as streams are
-              // designed to be sync/async agnostic.
-              // Take note if the _read call is sync or async (ie, if the read call
-              // has returned yet), so that we know whether or not it's safe to emit
-              // 'readable' etc.
-              //
-              // 3. Actually pull the requested chunks out of the buffer and return.
-
-              // if we need a readable event, then we need to do some reading.
-              var doRead = state.needReadable;
-              debug('need readable', doRead);
-
-              // if we currently have less than the highWaterMark, then also read some
-              if (state.length === 0 || state.length - n < state.highWaterMark) {
-                doRead = true;
-                debug('length less than watermark', doRead);
-              }
-
-              // however, if we've ended, then there's no point, and if we're already
-              // reading, then it's unnecessary.
-              if (state.ended || state.reading) {
-                doRead = false;
-                debug('reading or ended', doRead);
-              } else if (doRead) {
-                debug('do read');
-                state.reading = true;
-                state.sync = true;
-                // if the length is currently zero, then we *need* a readable event.
-                if (state.length === 0) state.needReadable = true;
-                // call internal read method
-                this._read(state.highWaterMark);
-                state.sync = false;
-                // If _read pushed data synchronously, then `reading` will be false,
-                // and we need to re-evaluate how much data we can return to the user.
-                if (!state.reading) n = howMuchToRead(nOrig, state);
-              }
-
-              var ret;
-              if (n > 0) ret = fromList(n, state);else ret = null;
-
-              if (ret === null) {
-                state.needReadable = true;
-                n = 0;
-              } else {
-                state.length -= n;
-              }
-
-              if (state.length === 0) {
-                // If we have nothing in the buffer, then we want to know
-                // as soon as we *do* get something into the buffer.
-                if (!state.ended) state.needReadable = true;
-
-                // If we tried to read() past the EOF, then emit end on the next tick.
-                if (nOrig !== n && state.ended) endReadable(this);
-              }
-
-              if (ret !== null) this.emit('data', ret);
-
-              return ret;
-            };
-
-            function chunkInvalid(state, chunk) {
-              var er = null;
-              if (!isBuffer(chunk) && typeof chunk !== 'string' && chunk !== null && chunk !== undefined && !state.objectMode) {
-                er = new TypeError('Invalid non-string/buffer chunk');
-              }
-              return er;
-            }
-
-            function onEofChunk(stream, state) {
-              if (state.ended) return;
-              if (state.decoder) {
-                var chunk = state.decoder.end();
-                if (chunk && chunk.length) {
-                  state.buffer.push(chunk);
-                  state.length += state.objectMode ? 1 : chunk.length;
-                }
-              }
-              state.ended = true;
-
-              // emit 'readable' now to make sure it gets picked up.
-              emitReadable(stream);
-            }
-
-            // Don't emit readable right away in sync mode, because this can trigger
-            // another read() call => stack overflow.  This way, it might trigger
-            // a nextTick recursion warning, but that's not so bad.
-            function emitReadable(stream) {
-              var state = stream._readableState;
-              state.needReadable = false;
-              if (!state.emittedReadable) {
-                debug('emitReadable', state.flowing);
-                state.emittedReadable = true;
-                if (state.sync) nextTick(emitReadable_, stream);else emitReadable_(stream);
-              }
-            }
-
-            function emitReadable_(stream) {
-              debug('emit readable');
-              stream.emit('readable');
-              flow(stream);
-            }
-
-            // at this point, the user has presumably seen the 'readable' event,
-            // and called read() to consume some data.  that may have triggered
-            // in turn another _read(n) call, in which case reading = true if
-            // it's in progress.
-            // However, if we're not ended, or reading, and the length < hwm,
-            // then go ahead and try to read some more preemptively.
-            function maybeReadMore(stream, state) {
-              if (!state.readingMore) {
-                state.readingMore = true;
-                nextTick(maybeReadMore_, stream, state);
-              }
-            }
-
-            function maybeReadMore_(stream, state) {
-              var len = state.length;
-              while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-                debug('maybeReadMore read 0');
-                stream.read(0);
-                if (len === state.length)
-                  // didn't get any data, stop spinning.
-                  break;else len = state.length;
-              }
-              state.readingMore = false;
-            }
-
-            // abstract method.  to be overridden in specific implementation classes.
-            // call cb(er, data) where data is <= n in length.
-            // for virtual (non-string, non-buffer) streams, "length" is somewhat
-            // arbitrary, and perhaps not very meaningful.
-            Readable.prototype._read = function (n) {
-              this.emit('error', new Error('not implemented'));
-            };
-
-            Readable.prototype.pipe = function (dest, pipeOpts) {
-              var src = this;
-              var state = this._readableState;
-
-              switch (state.pipesCount) {
-                case 0:
-                  state.pipes = dest;
-                  break;
-                case 1:
-                  state.pipes = [state.pipes, dest];
-                  break;
-                default:
-                  state.pipes.push(dest);
-                  break;
-              }
-              state.pipesCount += 1;
-              debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-              var doEnd = (!pipeOpts || pipeOpts.end !== false);
-
-              var endFn = doEnd ? onend : cleanup;
-              if (state.endEmitted) nextTick(endFn);else src.once('end', endFn);
-
-              dest.on('unpipe', onunpipe);
-              function onunpipe(readable) {
-                debug('onunpipe');
-                if (readable === src) {
-                  cleanup();
-                }
-              }
-
-              function onend() {
-                debug('onend');
-                dest.end();
-              }
-
-              // when the dest drains, it reduces the awaitDrain counter
-              // on the source.  This would be more elegant with a .once()
-              // handler in flow(), but adding and removing repeatedly is
-              // too slow.
-              var ondrain = pipeOnDrain(src);
-              dest.on('drain', ondrain);
-
-              var cleanedUp = false;
-              function cleanup() {
-                debug('cleanup');
-                // cleanup event handlers once the pipe is broken
-                dest.removeListener('close', onclose);
-                dest.removeListener('finish', onfinish);
-                dest.removeListener('drain', ondrain);
-                dest.removeListener('error', onerror);
-                dest.removeListener('unpipe', onunpipe);
-                src.removeListener('end', onend);
-                src.removeListener('end', cleanup);
-                src.removeListener('data', ondata);
-
-                cleanedUp = true;
-
-                // if the reader is waiting for a drain event from this
-                // specific writer, then it would cause it to never start
-                // flowing again.
-                // So, if this is awaiting a drain, then we just call it now.
-                // If we don't know, then assume that we are waiting for one.
-                if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-              }
-
-              // If the user pushes more data while we're writing to dest then we'll end up
-              // in ondata again. However, we only want to increase awaitDrain once because
-              // dest will only emit one 'drain' event for the multiple writes.
-              // => Introduce a guard on increasing awaitDrain.
-              var increasedAwaitDrain = false;
-              src.on('data', ondata);
-              function ondata(chunk) {
-                debug('ondata');
-                increasedAwaitDrain = false;
-                var ret = dest.write(chunk);
-                if (false === ret && !increasedAwaitDrain) {
-                  // If the user unpiped during `dest.write()`, it is possible
-                  // to get stuck in a permanently paused state if that write
-                  // also returned false.
-                  // => Check whether `dest` is still a piping destination.
-                  if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
-                    debug('false write response, pause', src._readableState.awaitDrain);
-                    src._readableState.awaitDrain++;
-                    increasedAwaitDrain = true;
-                  }
-                  src.pause();
-                }
-              }
-
-              // if the dest has an error, then stop piping into it.
-              // however, don't suppress the throwing behavior for this.
-              function onerror(er) {
-                debug('onerror', er);
-                unpipe();
-                dest.removeListener('error', onerror);
-                if (listenerCount$1(dest, 'error') === 0) dest.emit('error', er);
-              }
-
-              // Make sure our error handler is attached before userland ones.
-              prependListener(dest, 'error', onerror);
-
-              // Both close and finish should trigger unpipe, but only once.
-              function onclose() {
-                dest.removeListener('finish', onfinish);
-                unpipe();
-              }
-              dest.once('close', onclose);
-              function onfinish() {
-                debug('onfinish');
-                dest.removeListener('close', onclose);
-                unpipe();
-              }
-              dest.once('finish', onfinish);
-
-              function unpipe() {
-                debug('unpipe');
-                src.unpipe(dest);
-              }
-
-              // tell the dest that it's being piped to
-              dest.emit('pipe', src);
-
-              // start the flow if it hasn't been started already.
-              if (!state.flowing) {
-                debug('pipe resume');
-                src.resume();
-              }
-
-              return dest;
-            };
-
-            function pipeOnDrain(src) {
-              return function () {
-                var state = src._readableState;
-                debug('pipeOnDrain', state.awaitDrain);
-                if (state.awaitDrain) state.awaitDrain--;
-                if (state.awaitDrain === 0 && src.listeners('data').length) {
-                  state.flowing = true;
-                  flow(src);
-                }
-              };
-            }
-
-            Readable.prototype.unpipe = function (dest) {
-              var state = this._readableState;
-
-              // if we're not piping anywhere, then do nothing.
-              if (state.pipesCount === 0) return this;
-
-              // just one destination.  most common case.
-              if (state.pipesCount === 1) {
-                // passed in one, but it's not the right one.
-                if (dest && dest !== state.pipes) return this;
-
-                if (!dest) dest = state.pipes;
-
-                // got a match.
-                state.pipes = null;
-                state.pipesCount = 0;
-                state.flowing = false;
-                if (dest) dest.emit('unpipe', this);
-                return this;
-              }
-
-              // slow case. multiple pipe destinations.
-
-              if (!dest) {
-                // remove all.
-                var dests = state.pipes;
-                var len = state.pipesCount;
-                state.pipes = null;
-                state.pipesCount = 0;
-                state.flowing = false;
-
-                for (var _i = 0; _i < len; _i++) {
-                  dests[_i].emit('unpipe', this);
-                }return this;
-              }
-
-              // try to find the right one.
-              var i = indexOf(state.pipes, dest);
-              if (i === -1) return this;
-
-              state.pipes.splice(i, 1);
-              state.pipesCount -= 1;
-              if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-              dest.emit('unpipe', this);
-
-              return this;
-            };
-
-            // set up data events if they are asked for
-            // Ensure readable listeners eventually get something
-            Readable.prototype.on = function (ev, fn) {
-              var res = EventEmitter.prototype.on.call(this, ev, fn);
-
-              if (ev === 'data') {
-                // Start flowing on next tick if stream isn't explicitly paused
-                if (this._readableState.flowing !== false) this.resume();
-              } else if (ev === 'readable') {
-                var state = this._readableState;
-                if (!state.endEmitted && !state.readableListening) {
-                  state.readableListening = state.needReadable = true;
-                  state.emittedReadable = false;
-                  if (!state.reading) {
-                    nextTick(nReadingNextTick, this);
-                  } else if (state.length) {
-                    emitReadable(this, state);
-                  }
-                }
-              }
-
-              return res;
-            };
-            Readable.prototype.addListener = Readable.prototype.on;
-
-            function nReadingNextTick(self) {
-              debug('readable nexttick read 0');
-              self.read(0);
-            }
-
-            // pause() and resume() are remnants of the legacy readable stream API
-            // If the user uses them, then switch into old mode.
-            Readable.prototype.resume = function () {
-              var state = this._readableState;
-              if (!state.flowing) {
-                debug('resume');
-                state.flowing = true;
-                resume(this, state);
-              }
-              return this;
-            };
-
-            function resume(stream, state) {
-              if (!state.resumeScheduled) {
-                state.resumeScheduled = true;
-                nextTick(resume_, stream, state);
-              }
-            }
-
-            function resume_(stream, state) {
-              if (!state.reading) {
-                debug('resume read 0');
-                stream.read(0);
-              }
-
-              state.resumeScheduled = false;
-              state.awaitDrain = 0;
-              stream.emit('resume');
-              flow(stream);
-              if (state.flowing && !state.reading) stream.read(0);
-            }
-
-            Readable.prototype.pause = function () {
-              debug('call pause flowing=%j', this._readableState.flowing);
-              if (false !== this._readableState.flowing) {
-                debug('pause');
-                this._readableState.flowing = false;
-                this.emit('pause');
-              }
-              return this;
-            };
-
-            function flow(stream) {
-              var state = stream._readableState;
-              debug('flow', state.flowing);
-              while (state.flowing && stream.read() !== null) {}
-            }
-
-            // wrap an old-style stream as the async data source.
-            // This is *not* part of the readable stream interface.
-            // It is an ugly unfortunate mess of history.
-            Readable.prototype.wrap = function (stream) {
-              var state = this._readableState;
-              var paused = false;
-
-              var self = this;
-              stream.on('end', function () {
-                debug('wrapped end');
-                if (state.decoder && !state.ended) {
-                  var chunk = state.decoder.end();
-                  if (chunk && chunk.length) self.push(chunk);
-                }
-
-                self.push(null);
-              });
-
-              stream.on('data', function (chunk) {
-                debug('wrapped data');
-                if (state.decoder) chunk = state.decoder.write(chunk);
-
-                // don't skip over falsy values in objectMode
-                if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-                var ret = self.push(chunk);
-                if (!ret) {
-                  paused = true;
-                  stream.pause();
-                }
-              });
-
-              // proxy all the other methods.
-              // important when wrapping filters and duplexes.
-              for (var i in stream) {
-                if (this[i] === undefined && typeof stream[i] === 'function') {
-                  this[i] = function (method) {
-                    return function () {
-                      return stream[method].apply(stream, arguments);
-                    };
-                  }(i);
-                }
-              }
-
-              // proxy certain important events.
-              var events = ['error', 'close', 'destroy', 'pause', 'resume'];
-              forEach(events, function (ev) {
-                stream.on(ev, self.emit.bind(self, ev));
-              });
-
-              // when we try to consume some more bytes, simply unpause the
-              // underlying stream.
-              self._read = function (n) {
-                debug('wrapped _read', n);
-                if (paused) {
-                  paused = false;
-                  stream.resume();
-                }
-              };
-
-              return self;
-            };
-
-            // exposed for testing purposes only.
-            Readable._fromList = fromList;
-
-            // Pluck off n bytes from an array of buffers.
-            // Length is the combined lengths of all the buffers in the list.
-            // This function is designed to be inlinable, so please take care when making
-            // changes to the function body.
-            function fromList(n, state) {
-              // nothing buffered
-              if (state.length === 0) return null;
-
-              var ret;
-              if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
-                // read it all, truncate the list
-                if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
-                state.buffer.clear();
-              } else {
-                // read part of list
-                ret = fromListPartial(n, state.buffer, state.decoder);
-              }
-
-              return ret;
-            }
-
-            // Extracts only enough buffered data to satisfy the amount requested.
-            // This function is designed to be inlinable, so please take care when making
-            // changes to the function body.
-            function fromListPartial(n, list, hasStrings) {
-              var ret;
-              if (n < list.head.data.length) {
-                // slice is the same for buffers and strings
-                ret = list.head.data.slice(0, n);
-                list.head.data = list.head.data.slice(n);
-              } else if (n === list.head.data.length) {
-                // first chunk is a perfect match
-                ret = list.shift();
-              } else {
-                // result spans more than one buffer
-                ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
-              }
-              return ret;
-            }
-
-            // Copies a specified amount of characters from the list of buffered data
-            // chunks.
-            // This function is designed to be inlinable, so please take care when making
-            // changes to the function body.
-            function copyFromBufferString(n, list) {
-              var p = list.head;
-              var c = 1;
-              var ret = p.data;
-              n -= ret.length;
-              while (p = p.next) {
-                var str = p.data;
-                var nb = n > str.length ? str.length : n;
-                if (nb === str.length) ret += str;else ret += str.slice(0, n);
-                n -= nb;
-                if (n === 0) {
-                  if (nb === str.length) {
-                    ++c;
-                    if (p.next) list.head = p.next;else list.head = list.tail = null;
-                  } else {
-                    list.head = p;
-                    p.data = str.slice(nb);
-                  }
-                  break;
-                }
-                ++c;
-              }
-              list.length -= c;
-              return ret;
-            }
-
-            // Copies a specified amount of bytes from the list of buffered data chunks.
-            // This function is designed to be inlinable, so please take care when making
-            // changes to the function body.
-            function copyFromBuffer(n, list) {
-              var ret = Buffer.allocUnsafe(n);
-              var p = list.head;
-              var c = 1;
-              p.data.copy(ret);
-              n -= p.data.length;
-              while (p = p.next) {
-                var buf = p.data;
-                var nb = n > buf.length ? buf.length : n;
-                buf.copy(ret, ret.length - n, 0, nb);
-                n -= nb;
-                if (n === 0) {
-                  if (nb === buf.length) {
-                    ++c;
-                    if (p.next) list.head = p.next;else list.head = list.tail = null;
-                  } else {
-                    list.head = p;
-                    p.data = buf.slice(nb);
-                  }
-                  break;
-                }
-                ++c;
-              }
-              list.length -= c;
-              return ret;
-            }
-
-            function endReadable(stream) {
-              var state = stream._readableState;
-
-              // If we get here before consuming all the bytes, then that is a
-              // bug in node.  Should never happen.
-              if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
-
-              if (!state.endEmitted) {
-                state.ended = true;
-                nextTick(endReadableNT, state, stream);
-              }
-            }
-
-            function endReadableNT(state, stream) {
-              // Check that we didn't get one last unshift.
-              if (!state.endEmitted && state.length === 0) {
-                state.endEmitted = true;
-                stream.readable = false;
-                stream.emit('end');
-              }
-            }
-
-            function forEach(xs, f) {
-              for (var i = 0, l = xs.length; i < l; i++) {
-                f(xs[i], i);
-              }
-            }
-
-            function indexOf(xs, x) {
-              for (var i = 0, l = xs.length; i < l; i++) {
-                if (xs[i] === x) return i;
-              }
-              return -1;
-            }
-
-            // A bit simpler than readable streams.
-            Writable.WritableState = WritableState;
-            inherits$1(Writable, EventEmitter);
-
-            function nop() {}
-
-            function WriteReq(chunk, encoding, cb) {
-              this.chunk = chunk;
-              this.encoding = encoding;
-              this.callback = cb;
-              this.next = null;
-            }
-
-            function WritableState(options, stream) {
-              Object.defineProperty(this, 'buffer', {
-                get: deprecate(function () {
-                  return this.getBuffer();
-                }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.')
-              });
-              options = options || {};
-
-              // object stream flag to indicate whether or not this stream
-              // contains buffers or objects.
-              this.objectMode = !!options.objectMode;
-
-              if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-              // the point at which write() starts returning false
-              // Note: 0 is a valid value, means that we always return false if
-              // the entire buffer is not flushed immediately on write()
-              var hwm = options.highWaterMark;
-              var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-              this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;
-
-              // cast to ints.
-              this.highWaterMark = ~ ~this.highWaterMark;
-
-              this.needDrain = false;
-              // at the start of calling end()
-              this.ending = false;
-              // when end() has been called, and returned
-              this.ended = false;
-              // when 'finish' is emitted
-              this.finished = false;
-
-              // should we decode strings into buffers before passing to _write?
-              // this is here so that some node-core streams can optimize string
-              // handling at a lower level.
-              var noDecode = options.decodeStrings === false;
-              this.decodeStrings = !noDecode;
-
-              // Crypto is kind of old and crusty.  Historically, its default string
-              // encoding is 'binary' so we have to make this configurable.
-              // Everything else in the universe uses 'utf8', though.
-              this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-              // not an actual buffer we keep track of, but a measurement
-              // of how much we're waiting to get pushed to some underlying
-              // socket or file.
-              this.length = 0;
-
-              // a flag to see when we're in the middle of a write.
-              this.writing = false;
-
-              // when true all writes will be buffered until .uncork() call
-              this.corked = 0;
-
-              // a flag to be able to tell if the onwrite cb is called immediately,
-              // or on a later tick.  We set this to true at first, because any
-              // actions that shouldn't happen until "later" should generally also
-              // not happen before the first write call.
-              this.sync = true;
-
-              // a flag to know if we're processing previously buffered items, which
-              // may call the _write() callback in the same tick, so that we don't
-              // end up in an overlapped onwrite situation.
-              this.bufferProcessing = false;
-
-              // the callback that's passed to _write(chunk,cb)
-              this.onwrite = function (er) {
-                onwrite(stream, er);
-              };
-
-              // the callback that the user supplies to write(chunk,encoding,cb)
-              this.writecb = null;
-
-              // the amount that is being written when _write is called.
-              this.writelen = 0;
-
-              this.bufferedRequest = null;
-              this.lastBufferedRequest = null;
-
-              // number of pending user-supplied write callbacks
-              // this must be 0 before 'finish' can be emitted
-              this.pendingcb = 0;
-
-              // emit prefinish if the only thing we're waiting for is _write cbs
-              // This is relevant for synchronous Transform streams
-              this.prefinished = false;
-
-              // True if the error was already emitted and should not be thrown again
-              this.errorEmitted = false;
-
-              // count buffered requests
-              this.bufferedRequestCount = 0;
-
-              // allocate the first CorkedRequest, there is always
-              // one allocated and free to use, and we maintain at most two
-              this.corkedRequestsFree = new CorkedRequest(this);
-            }
-
-            WritableState.prototype.getBuffer = function writableStateGetBuffer() {
-              var current = this.bufferedRequest;
-              var out = [];
-              while (current) {
-                out.push(current);
-                current = current.next;
-              }
-              return out;
-            };
-            function Writable(options) {
-
-              // Writable ctor is applied to Duplexes, though they're not
-              // instanceof Writable, they're instanceof Readable.
-              if (!(this instanceof Writable) && !(this instanceof Duplex)) return new Writable(options);
-
-              this._writableState = new WritableState(options, this);
-
-              // legacy.
-              this.writable = true;
-
-              if (options) {
-                if (typeof options.write === 'function') this._write = options.write;
-
-                if (typeof options.writev === 'function') this._writev = options.writev;
-              }
-
-              EventEmitter.call(this);
-            }
-
-            // Otherwise people can pipe Writable streams, which is just wrong.
-            Writable.prototype.pipe = function () {
-              this.emit('error', new Error('Cannot pipe, not readable'));
-            };
-
-            function writeAfterEnd(stream, cb) {
-              var er = new Error('write after end');
-              // TODO: defer error events consistently everywhere, not just the cb
-              stream.emit('error', er);
-              nextTick(cb, er);
-            }
-
-            // If we get something that is not a buffer, string, null, or undefined,
-            // and we're not in objectMode, then that's an error.
-            // Otherwise stream chunks are all considered to be of length=1, and the
-            // watermarks determine how many objects to keep in the buffer, rather than
-            // how many bytes or characters.
-            function validChunk(stream, state, chunk, cb) {
-              var valid = true;
-              var er = false;
-              // Always throw error if a null is written
-              // if we are not in object mode then throw
-              // if it is not a buffer, string, or undefined.
-              if (chunk === null) {
-                er = new TypeError('May not write null values to stream');
-              } else if (!Buffer.isBuffer(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-                er = new TypeError('Invalid non-string/buffer chunk');
-              }
-              if (er) {
-                stream.emit('error', er);
-                nextTick(cb, er);
-                valid = false;
-              }
-              return valid;
-            }
-
-            Writable.prototype.write = function (chunk, encoding, cb) {
-              var state = this._writableState;
-              var ret = false;
-
-              if (typeof encoding === 'function') {
-                cb = encoding;
-                encoding = null;
-              }
-
-              if (Buffer.isBuffer(chunk)) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-              if (typeof cb !== 'function') cb = nop;
-
-              if (state.ended) writeAfterEnd(this, cb);else if (validChunk(this, state, chunk, cb)) {
-                state.pendingcb++;
-                ret = writeOrBuffer(this, state, chunk, encoding, cb);
-              }
-
-              return ret;
-            };
-
-            Writable.prototype.cork = function () {
-              var state = this._writableState;
-
-              state.corked++;
-            };
-
-            Writable.prototype.uncork = function () {
-              var state = this._writableState;
-
-              if (state.corked) {
-                state.corked--;
-
-                if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-              }
-            };
-
-            Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-              // node::ParseEncoding() requires lower case.
-              if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-              if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-              this._writableState.defaultEncoding = encoding;
-              return this;
-            };
-
-            function decodeChunk(state, chunk, encoding) {
-              if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-                chunk = Buffer.from(chunk, encoding);
-              }
-              return chunk;
-            }
-
-            // if we're already writing something, then just put this
-            // in the queue, and wait our turn.  Otherwise, call _write
-            // If we return false, then we need a drain event, so set that flag.
-            function writeOrBuffer(stream, state, chunk, encoding, cb) {
-              chunk = decodeChunk(state, chunk, encoding);
-
-              if (Buffer.isBuffer(chunk)) encoding = 'buffer';
-              var len = state.objectMode ? 1 : chunk.length;
-
-              state.length += len;
-
-              var ret = state.length < state.highWaterMark;
-              // we must ensure that previous needDrain will not be reset to false.
-              if (!ret) state.needDrain = true;
-
-              if (state.writing || state.corked) {
-                var last = state.lastBufferedRequest;
-                state.lastBufferedRequest = new WriteReq(chunk, encoding, cb);
-                if (last) {
-                  last.next = state.lastBufferedRequest;
-                } else {
-                  state.bufferedRequest = state.lastBufferedRequest;
-                }
-                state.bufferedRequestCount += 1;
-              } else {
-                doWrite(stream, state, false, len, chunk, encoding, cb);
-              }
-
-              return ret;
-            }
-
-            function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-              state.writelen = len;
-              state.writecb = cb;
-              state.writing = true;
-              state.sync = true;
-              if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-              state.sync = false;
-            }
-
-            function onwriteError(stream, state, sync, er, cb) {
-              --state.pendingcb;
-              if (sync) nextTick(cb, er);else cb(er);
-
-              stream._writableState.errorEmitted = true;
-              stream.emit('error', er);
-            }
-
-            function onwriteStateUpdate(state) {
-              state.writing = false;
-              state.writecb = null;
-              state.length -= state.writelen;
-              state.writelen = 0;
-            }
-
-            function onwrite(stream, er) {
-              var state = stream._writableState;
-              var sync = state.sync;
-              var cb = state.writecb;
-
-              onwriteStateUpdate(state);
-
-              if (er) onwriteError(stream, state, sync, er, cb);else {
-                // Check if we're actually ready to finish, but don't emit yet
-                var finished = needFinish(state);
-
-                if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-                  clearBuffer(stream, state);
-                }
-
-                if (sync) {
-                  /*<replacement>*/
-                    nextTick(afterWrite, stream, state, finished, cb);
-                  /*</replacement>*/
-                } else {
-                    afterWrite(stream, state, finished, cb);
-                  }
-              }
-            }
-
-            function afterWrite(stream, state, finished, cb) {
-              if (!finished) onwriteDrain(stream, state);
-              state.pendingcb--;
-              cb();
-              finishMaybe(stream, state);
-            }
-
-            // Must force callback to be called on nextTick, so that we don't
-            // emit 'drain' before the write() consumer gets the 'false' return
-            // value, and has a chance to attach a 'drain' listener.
-            function onwriteDrain(stream, state) {
-              if (state.length === 0 && state.needDrain) {
-                state.needDrain = false;
-                stream.emit('drain');
-              }
-            }
-
-            // if there's something in the buffer waiting, then process it
-            function clearBuffer(stream, state) {
-              state.bufferProcessing = true;
-              var entry = state.bufferedRequest;
-
-              if (stream._writev && entry && entry.next) {
-                // Fast case, write everything using _writev()
-                var l = state.bufferedRequestCount;
-                var buffer = new Array(l);
-                var holder = state.corkedRequestsFree;
-                holder.entry = entry;
-
-                var count = 0;
-                while (entry) {
-                  buffer[count] = entry;
-                  entry = entry.next;
-                  count += 1;
-                }
-
-                doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-                // doWrite is almost always async, defer these to save a bit of time
-                // as the hot path ends with doWrite
-                state.pendingcb++;
-                state.lastBufferedRequest = null;
-                if (holder.next) {
-                  state.corkedRequestsFree = holder.next;
-                  holder.next = null;
-                } else {
-                  state.corkedRequestsFree = new CorkedRequest(state);
-                }
-              } else {
-                // Slow case, write chunks one-by-one
-                while (entry) {
-                  var chunk = entry.chunk;
-                  var encoding = entry.encoding;
-                  var cb = entry.callback;
-                  var len = state.objectMode ? 1 : chunk.length;
-
-                  doWrite(stream, state, false, len, chunk, encoding, cb);
-                  entry = entry.next;
-                  // if we didn't call the onwrite immediately, then
-                  // it means that we need to wait until it does.
-                  // also, that means that the chunk and cb are currently
-                  // being processed, so move the buffer counter past them.
-                  if (state.writing) {
-                    break;
-                  }
-                }
-
-                if (entry === null) state.lastBufferedRequest = null;
-              }
-
-              state.bufferedRequestCount = 0;
-              state.bufferedRequest = entry;
-              state.bufferProcessing = false;
-            }
-
-            Writable.prototype._write = function (chunk, encoding, cb) {
-              cb(new Error('not implemented'));
-            };
-
-            Writable.prototype._writev = null;
-
-            Writable.prototype.end = function (chunk, encoding, cb) {
-              var state = this._writableState;
-
-              if (typeof chunk === 'function') {
-                cb = chunk;
-                chunk = null;
-                encoding = null;
-              } else if (typeof encoding === 'function') {
-                cb = encoding;
-                encoding = null;
-              }
-
-              if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-              // .end() fully uncorks
-              if (state.corked) {
-                state.corked = 1;
-                this.uncork();
-              }
-
-              // ignore unnecessary end() calls.
-              if (!state.ending && !state.finished) endWritable(this, state, cb);
-            };
-
-            function needFinish(state) {
-              return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-            }
-
-            function prefinish(stream, state) {
-              if (!state.prefinished) {
-                state.prefinished = true;
-                stream.emit('prefinish');
-              }
-            }
-
-            function finishMaybe(stream, state) {
-              var need = needFinish(state);
-              if (need) {
-                if (state.pendingcb === 0) {
-                  prefinish(stream, state);
-                  state.finished = true;
-                  stream.emit('finish');
-                } else {
-                  prefinish(stream, state);
-                }
-              }
-              return need;
-            }
-
-            function endWritable(stream, state, cb) {
-              state.ending = true;
-              finishMaybe(stream, state);
-              if (cb) {
-                if (state.finished) nextTick(cb);else stream.once('finish', cb);
-              }
-              state.ended = true;
-              stream.writable = false;
-            }
-
-            // It seems a linked list but it is not
-            // there will be only 2 of these for each stream
-            function CorkedRequest(state) {
-              var _this = this;
-
-              this.next = null;
-              this.entry = null;
-
-              this.finish = function (err) {
-                var entry = _this.entry;
-                _this.entry = null;
-                while (entry) {
-                  var cb = entry.callback;
-                  state.pendingcb--;
-                  cb(err);
-                  entry = entry.next;
-                }
-                if (state.corkedRequestsFree) {
-                  state.corkedRequestsFree.next = _this;
-                } else {
-                  state.corkedRequestsFree = _this;
-                }
-              };
-            }
-
-            inherits$1(Duplex, Readable);
-
-            var keys$1 = Object.keys(Writable.prototype);
-            for (var v = 0; v < keys$1.length; v++) {
-              var method = keys$1[v];
-              if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-            }
-            function Duplex(options) {
-              if (!(this instanceof Duplex)) return new Duplex(options);
-
-              Readable.call(this, options);
-              Writable.call(this, options);
-
-              if (options && options.readable === false) this.readable = false;
-
-              if (options && options.writable === false) this.writable = false;
-
-              this.allowHalfOpen = true;
-              if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-              this.once('end', onend);
-            }
-
-            // the no-half-open enforcer
-            function onend() {
-              // if we allow half-open state, or if the writable side ended,
-              // then we're ok.
-              if (this.allowHalfOpen || this._writableState.ended) return;
-
-              // no more data can be written.
-              // But allow more writes to happen in this tick.
-              nextTick(onEndNT, this);
-            }
-
-            function onEndNT(self) {
-              self.end();
-            }
-
-            // a transform stream is a readable/writable stream where you do
-            inherits$1(Transform, Duplex);
-
-            function TransformState(stream) {
-              this.afterTransform = function (er, data) {
-                return afterTransform(stream, er, data);
-              };
-
-              this.needTransform = false;
-              this.transforming = false;
-              this.writecb = null;
-              this.writechunk = null;
-              this.writeencoding = null;
-            }
-
-            function afterTransform(stream, er, data) {
-              var ts = stream._transformState;
-              ts.transforming = false;
-
-              var cb = ts.writecb;
-
-              if (!cb) return stream.emit('error', new Error('no writecb in Transform class'));
-
-              ts.writechunk = null;
-              ts.writecb = null;
-
-              if (data !== null && data !== undefined) stream.push(data);
-
-              cb(er);
-
-              var rs = stream._readableState;
-              rs.reading = false;
-              if (rs.needReadable || rs.length < rs.highWaterMark) {
-                stream._read(rs.highWaterMark);
-              }
-            }
-            function Transform(options) {
-              if (!(this instanceof Transform)) return new Transform(options);
-
-              Duplex.call(this, options);
-
-              this._transformState = new TransformState(this);
-
-              // when the writable side finishes, then flush out anything remaining.
-              var stream = this;
-
-              // start out asking for a readable event once data is transformed.
-              this._readableState.needReadable = true;
-
-              // we have implemented the _read method, and done the other things
-              // that Readable wants before the first _read call, so unset the
-              // sync guard flag.
-              this._readableState.sync = false;
-
-              if (options) {
-                if (typeof options.transform === 'function') this._transform = options.transform;
-
-                if (typeof options.flush === 'function') this._flush = options.flush;
-              }
-
-              this.once('prefinish', function () {
-                if (typeof this._flush === 'function') this._flush(function (er) {
-                  done(stream, er);
-                });else done(stream);
-              });
-            }
-
-            Transform.prototype.push = function (chunk, encoding) {
-              this._transformState.needTransform = false;
-              return Duplex.prototype.push.call(this, chunk, encoding);
-            };
-
-            // This is the part where you do stuff!
-            // override this function in implementation classes.
-            // 'chunk' is an input chunk.
-            //
-            // Call `push(newChunk)` to pass along transformed output
-            // to the readable side.  You may call 'push' zero or more times.
-            //
-            // Call `cb(err)` when you are done with this chunk.  If you pass
-            // an error, then that'll put the hurt on the whole operation.  If you
-            // never call cb(), then you'll never get another chunk.
-            Transform.prototype._transform = function (chunk, encoding, cb) {
-              throw new Error('Not implemented');
-            };
-
-            Transform.prototype._write = function (chunk, encoding, cb) {
-              var ts = this._transformState;
-              ts.writecb = cb;
-              ts.writechunk = chunk;
-              ts.writeencoding = encoding;
-              if (!ts.transforming) {
-                var rs = this._readableState;
-                if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-              }
-            };
-
-            // Doesn't matter what the args are here.
-            // _transform does all the work.
-            // That we got here means that the readable side wants more data.
-            Transform.prototype._read = function (n) {
-              var ts = this._transformState;
-
-              if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-                ts.transforming = true;
-                this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-              } else {
-                // mark that we need a transform, so that any data that comes in
-                // will get processed, now that we've asked for it.
-                ts.needTransform = true;
-              }
-            };
-
-            function done(stream, er) {
-              if (er) return stream.emit('error', er);
-
-              // if there's nothing in the write buffer, then that means
-              // that nothing more will ever be provided
-              var ws = stream._writableState;
-              var ts = stream._transformState;
-
-              if (ws.length) throw new Error('Calling transform done when ws.length != 0');
-
-              if (ts.transforming) throw new Error('Calling transform done when still transforming');
-
-              return stream.push(null);
-            }
-
-            inherits$1(PassThrough, Transform);
-            function PassThrough(options) {
-              if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-              Transform.call(this, options);
-            }
-
-            PassThrough.prototype._transform = function (chunk, encoding, cb) {
-              cb(null, chunk);
-            };
-
-            inherits$1(Stream, EventEmitter);
-            Stream.Readable = Readable;
-            Stream.Writable = Writable;
-            Stream.Duplex = Duplex;
-            Stream.Transform = Transform;
-            Stream.PassThrough = PassThrough;
-
-            // Backwards-compat with node 0.4.x
-            Stream.Stream = Stream;
-
-            // old-style streams.  Note that the pipe method (the only relevant
-            // part of this class) is overridden in the Readable class.
-
-            function Stream() {
-              EventEmitter.call(this);
-            }
-
-            Stream.prototype.pipe = function(dest, options) {
-              var source = this;
-
-              function ondata(chunk) {
-                if (dest.writable) {
-                  if (false === dest.write(chunk) && source.pause) {
-                    source.pause();
-                  }
-                }
-              }
-
-              source.on('data', ondata);
-
-              function ondrain() {
-                if (source.readable && source.resume) {
-                  source.resume();
-                }
-              }
-
-              dest.on('drain', ondrain);
-
-              // If the 'end' option is not supplied, dest.end() will be called when
-              // source gets the 'end' or 'close' events.  Only dest.end() once.
-              if (!dest._isStdio && (!options || options.end !== false)) {
-                source.on('end', onend);
-                source.on('close', onclose);
-              }
-
-              var didOnEnd = false;
-              function onend() {
-                if (didOnEnd) return;
-                didOnEnd = true;
-
-                dest.end();
-              }
-
-
-              function onclose() {
-                if (didOnEnd) return;
-                didOnEnd = true;
-
-                if (typeof dest.destroy === 'function') dest.destroy();
-              }
-
-              // don't leave dangling pipes when there are errors.
-              function onerror(er) {
-                cleanup();
-                if (EventEmitter.listenerCount(this, 'error') === 0) {
-                  throw er; // Unhandled stream error in pipe.
-                }
-              }
-
-              source.on('error', onerror);
-              dest.on('error', onerror);
-
-              // remove all the event listeners that were added.
-              function cleanup() {
-                source.removeListener('data', ondata);
-                dest.removeListener('drain', ondrain);
-
-                source.removeListener('end', onend);
-                source.removeListener('close', onclose);
-
-                source.removeListener('error', onerror);
-                dest.removeListener('error', onerror);
-
-                source.removeListener('end', cleanup);
-                source.removeListener('close', cleanup);
-
-                dest.removeListener('close', cleanup);
-              }
-
-              source.on('end', cleanup);
-              source.on('close', cleanup);
-
-              dest.on('close', cleanup);
-
-              dest.emit('pipe', source);
-
-              // Allow for unix-like usage: A.pipe(B).pipe(C)
-              return dest;
-            };
-
-            var debug$1 = require('debug')('ebml:decoder');
-
-            var STATE_TAG = 1;
-            var STATE_SIZE = 2;
-            var STATE_CONTENT = 3;
-
-            var EbmlDecoder =
-            /*#__PURE__*/
-            function (_Transform) {
-              _inherits(EbmlDecoder, _Transform);
-
-              /**
-               * @property
-               * @private
-               * @type {Buffer}
-               */
-
-              /**
-               * @private
-               * @property
-               * @readonly
-               */
-
-              /**
-               * @property
-               * @private
-               * @type {Number}
-               */
-
-              /**
-               * @property
-               * @private
-               * @type {Number}
-               */
-
-              /**
-               * @property
-               * @private
-               * @type {Number}
-               */
-
-              /**
-               * @constructor
-               * @param {Object} options The options to be passed along to the super class
-               */
-              function EbmlDecoder() {
-                var _this;
-
-                var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
-
-                _classCallCheck(this, EbmlDecoder);
-
-                _this = _possibleConstructorReturn(this, _getPrototypeOf(EbmlDecoder).call(this, _objectSpread({}, options, {
-                  readableObjectMode: true
-                })));
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mBuffer", null);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mTagStack", []);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mState", STATE_TAG);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mCursor", 0);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mTotal", 0);
-
-                return _this;
-              }
-
-              _createClass(EbmlDecoder, [{
-                key: "_transform",
-                value: function _transform(chunk, enc, done) {
-                  if (!this.buffer) {
-                    this.buffer = Buffer.from(chunk);
-                  } else {
-                    this.buffer = Tools.concatenate(this.buffer, Buffer.from(chunk));
-                  }
-
-                  while (this.cursor < this.buffer.length) {
-                    if (this.state === STATE_TAG && !this.readTag()) {
-                      break;
-                    }
-
-                    if (this.state === STATE_SIZE && !this.readSize()) {
-                      break;
-                    }
-
-                    if (this.state === STATE_CONTENT && !this.readContent()) {
-                      break;
-                    }
-                  }
-
-                  done();
-                }
-              }, {
-                key: "readTag",
-                value: function readTag() {
-                  if (debug$1.enabled) {
-                    debug$1('parsing tag');
-                  }
-
-                  if (this.cursor >= this.buffer.length) {
-                    if (debug$1.enabled) {
-                      debug$1('waiting for more data');
-                    }
-
-                    return false;
-                  }
-
-                  var start = this.total;
-                  var tag = Tools.readVint(this.buffer, this.cursor);
-
-                  if (tag == null) {
-                    if (debug$1.enabled) {
-                      debug$1('waiting for more data');
-                    }
-
-                    return false;
-                  }
-
-                  var tagStr = Tools.readHexString(this.buffer, this.cursor, this.cursor + tag.length);
-                  var tagNum = Number.parseInt(tagStr, 16);
-                  this.cursor += tag.length;
-                  this.total += tag.length;
-                  this.state = STATE_SIZE;
-                  var tagObj = {
-                    tag: tag.value,
-                    tagStr: tagStr,
-                    type: EbmlDecoder.getSchemaInfo(tagNum).type,
-                    name: EbmlDecoder.getSchemaInfo(tagNum).name,
-                    start: start,
-                    end: start + tag.length
-                  };
-                  this.tagStack.push(tagObj);
-
-                  if (debug$1.enabled) {
-                    debug$1("read tag: ".concat(tagStr));
-                  }
-
-                  return true;
-                }
-              }, {
-                key: "readSize",
-                value: function readSize() {
-                  var tagObj = this.tagStack[this.tagStack.length - 1];
-
-                  if (debug$1.enabled) {
-                    debug$1("parsing size for tag: ".concat(tagObj.tagStr));
-                  }
-
-                  if (this.cursor >= this.buffer.length) {
-                    if (debug$1.enabled) {
-                      debug$1('waiting for more data');
-                    }
-
-                    return false;
-                  }
-
-                  var size = Tools.readVint(this.buffer, this.cursor);
-
-                  if (size == null) {
-                    if (debug$1.enabled) {
-                      debug$1('waiting for more data');
-                    }
-
-                    return false;
-                  }
-
-                  this.cursor += size.length;
-                  this.total += size.length;
-                  this.state = STATE_CONTENT;
-                  tagObj.dataSize = size.value; // unknown size
-
-                  if (size.value === -1) {
-                    tagObj.end = -1;
-                  } else {
-                    tagObj.end += size.value + size.length;
-                  }
-
-                  if (debug$1.enabled) {
-                    debug$1("read size: ".concat(size.value));
-                  }
-
-                  return true;
-                }
-              }, {
-                key: "readContent",
-                value: function readContent() {
-                  var _this$tagStack = this.tagStack[this.tagStack.length - 1],
-                      tagStr = _this$tagStack.tagStr,
-                      type = _this$tagStack.type,
-                      dataSize = _this$tagStack.dataSize,
-                      rest = _objectWithoutProperties(_this$tagStack, ["tagStr", "type", "dataSize"]);
-
-                  if (debug$1.enabled) {
-                    debug$1("parsing content for tag: ".concat(tagStr));
-                  }
-
-                  if (type === 'm') {
-                    if (debug$1.enabled) {
-                      debug$1('content should be tags');
-                    }
-
-                    this.push(['start', _objectSpread({
-                      tagStr: tagStr,
-                      type: type,
-                      dataSize: dataSize
-                    }, rest)]);
-                    this.state = STATE_TAG;
-                    return true;
-                  }
-
-                  if (this.buffer.length < this.cursor + dataSize) {
-                    if (debug$1.enabled) {
-                      debug$1("got: ".concat(this.buffer.length));
-                      debug$1("need: ".concat(this.cursor + dataSize));
-                      debug$1('waiting for more data');
-                    }
-
-                    return false;
-                  }
-
-                  var data = this.buffer.subarray(this.cursor, this.cursor + dataSize);
-                  this.total += dataSize;
-                  this.state = STATE_TAG;
-                  this.buffer = this.buffer.subarray(this.cursor + dataSize);
-                  this.cursor = 0;
-                  this.tagStack.pop(); // remove the object from the stack
-
-                  this.push(['tag', Tools.readDataFromTag(_objectSpread({
-                    tagStr: tagStr,
-                    type: type,
-                    dataSize: dataSize
-                  }, rest), Buffer.from(data))]);
-
-                  while (this.tagStack.length > 0) {
-                    var topEle = this.tagStack[this.tagStack.length - 1];
-
-                    if (this.total < topEle.end) {
-                      break;
-                    }
-
-                    this.push(['end', topEle]);
-                    this.tagStack.pop();
-                  }
-
-                  if (debug$1.enabled) {
-                    debug$1("read data: ".concat(data.toString('hex')));
-                  }
-
-                  return true;
-                }
-              }, {
-                key: "buffer",
-                get: function get() {
-                  return this.mBuffer;
-                },
-                set: function set(buffer) {
-                  this.mBuffer = buffer;
-                }
-                /**
-                 * @param {number} cursor
-                 */
-
-              }, {
-                key: "cursor",
-                get: function get() {
-                  return this.mCursor;
-                },
-                set: function set(cursor) {
-                  this.mCursor = cursor;
-                }
-              }, {
-                key: "state",
-                get: function get() {
-                  return this.mState;
-                },
-                set: function set(state) {
-                  this.mState = state;
-                }
-              }, {
-                key: "tagStack",
-                get: function get() {
-                  return this.mTagStack;
-                }
-              }, {
-                key: "total",
-                get: function get() {
-                  return this.mTotal;
-                },
-                set: function set(total) {
-                  this.mTotal = total;
-                }
-              }], [{
-                key: "getSchemaInfo",
-                value: function getSchemaInfo(tag) {
-                  if (Number.isInteger(tag) && schema.has(tag)) {
-                    return schema.get(tag);
-                  }
-
-                  return {
-                    type: null,
-                    name: 'unknown',
-                    description: '',
-                    level: -1,
-                    minver: -1,
-                    multiple: false,
-                    webm: false
-                  };
-                }
-              }]);
-
-              return EbmlDecoder;
-            }(Transform);
-
-            // 7.2.2 IsArray(argument)
-
-            var _isArray = Array.isArray || function isArray(arg) {
-              return _cof(arg) == 'Array';
-            };
-
-            var SPECIES$1 = _wks('species');
-
-            var _arraySpeciesConstructor = function (original) {
-              var C;
-              if (_isArray(original)) {
-                C = original.constructor;
-                // cross-realm fallback
-                if (typeof C == 'function' && (C === Array || _isArray(C.prototype))) C = undefined;
-                if (_isObject(C)) {
-                  C = C[SPECIES$1];
-                  if (C === null) C = undefined;
-                }
-              } return C === undefined ? Array : C;
-            };
-
-            // 9.4.2.3 ArraySpeciesCreate(originalArray, length)
-
-
-            var _arraySpeciesCreate = function (original, length) {
-              return new (_arraySpeciesConstructor(original))(length);
-            };
-
-            // 0 -> Array#forEach
-            // 1 -> Array#map
-            // 2 -> Array#filter
-            // 3 -> Array#some
-            // 4 -> Array#every
-            // 5 -> Array#find
-            // 6 -> Array#findIndex
-
-
-
-
-
-            var _arrayMethods = function (TYPE, $create) {
-              var IS_MAP = TYPE == 1;
-              var IS_FILTER = TYPE == 2;
-              var IS_SOME = TYPE == 3;
-              var IS_EVERY = TYPE == 4;
-              var IS_FIND_INDEX = TYPE == 6;
-              var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
-              var create = $create || _arraySpeciesCreate;
-              return function ($this, callbackfn, that) {
-                var O = _toObject($this);
-                var self = _iobject(O);
-                var f = _ctx(callbackfn, that, 3);
-                var length = _toLength(self.length);
-                var index = 0;
-                var result = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;
-                var val, res;
-                for (;length > index; index++) if (NO_HOLES || index in self) {
-                  val = self[index];
-                  res = f(val, index, O);
-                  if (TYPE) {
-                    if (IS_MAP) result[index] = res;   // map
-                    else if (res) switch (TYPE) {
-                      case 3: return true;             // some
-                      case 5: return val;              // find
-                      case 6: return index;            // findIndex
-                      case 2: result.push(val);        // filter
-                    } else if (IS_EVERY) return false; // every
-                  }
-                }
-                return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : result;
-              };
-            };
-
-            // 22.1.3.8 Array.prototype.find(predicate, thisArg = undefined)
-
-            var $find = _arrayMethods(5);
-            var KEY = 'find';
-            var forced = true;
-            // Shouldn't skip holes
-            if (KEY in []) Array(1)[KEY](function () { forced = false; });
-            _export(_export.P + _export.F * forced, 'Array', {
-              find: function find(callbackfn /* , that = undefined */) {
-                return $find(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
-              }
-            });
-            _addToUnscopables(KEY);
-
-            var buffers = Buffers;
-
-            function Buffers (bufs) {
-                if (!(this instanceof Buffers)) return new Buffers(bufs);
-                this.buffers = bufs || [];
-                this.length = this.buffers.reduce(function (size, buf) {
-                    return size + buf.length
-                }, 0);
-            }
-
-            Buffers.prototype.push = function () {
-                for (var i = 0; i < arguments.length; i++) {
-                    if (!isBuffer(arguments[i])) {
-                        throw new TypeError('Tried to push a non-buffer');
-                    }
-                }
-                
-                for (var i = 0; i < arguments.length; i++) {
-                    var buf = arguments[i];
-                    this.buffers.push(buf);
-                    this.length += buf.length;
-                }
-                return this.length;
-            };
-
-            Buffers.prototype.unshift = function () {
-                for (var i = 0; i < arguments.length; i++) {
-                    if (!isBuffer(arguments[i])) {
-                        throw new TypeError('Tried to unshift a non-buffer');
-                    }
-                }
-                
-                for (var i = 0; i < arguments.length; i++) {
-                    var buf = arguments[i];
-                    this.buffers.unshift(buf);
-                    this.length += buf.length;
-                }
-                return this.length;
-            };
-
-            Buffers.prototype.copy = function (dst, dStart, start, end) {
-                return this.slice(start, end).copy(dst, dStart, 0, end - start);
-            };
-
-            Buffers.prototype.splice = function (i, howMany) {
-                var buffers = this.buffers;
-                var index = i >= 0 ? i : this.length - i;
-                var reps = [].slice.call(arguments, 2);
-                
-                if (howMany === undefined) {
-                    howMany = this.length - index;
-                }
-                else if (howMany > this.length - index) {
-                    howMany = this.length - index;
-                }
-                
-                for (var i = 0; i < reps.length; i++) {
-                    this.length += reps[i].length;
-                }
-                
-                var removed = new Buffers();
-                
-                var startBytes = 0;
-                for (
-                    var ii = 0;
-                    ii < buffers.length && startBytes + buffers[ii].length < index;
-                    ii ++
-                ) { startBytes += buffers[ii].length; }
-                
-                if (index - startBytes > 0) {
-                    var start = index - startBytes;
-                    
-                    if (start + howMany < buffers[ii].length) {
-                        removed.push(buffers[ii].slice(start, start + howMany));
-                        
-                        var orig = buffers[ii];
-                        //var buf = new Buffer(orig.length - howMany);
-                        var buf0 = new Buffer(start);
-                        for (var i = 0; i < start; i++) {
-                            buf0[i] = orig[i];
-                        }
-                        
-                        var buf1 = new Buffer(orig.length - start - howMany);
-                        for (var i = start + howMany; i < orig.length; i++) {
-                            buf1[ i - howMany - start ] = orig[i];
-                        }
-                        
-                        if (reps.length > 0) {
-                            var reps_ = reps.slice();
-                            reps_.unshift(buf0);
-                            reps_.push(buf1);
-                            buffers.splice.apply(buffers, [ ii, 1 ].concat(reps_));
-                            ii += reps_.length;
-                            reps = [];
-                        }
-                        else {
-                            buffers.splice(ii, 1, buf0, buf1);
-                            //buffers[ii] = buf;
-                            ii += 2;
-                        }
-                    }
-                    else {
-                        removed.push(buffers[ii].slice(start));
-                        buffers[ii] = buffers[ii].slice(0, start);
-                        ii ++;
-                    }
-                }
-                
-                if (reps.length > 0) {
-                    buffers.splice.apply(buffers, [ ii, 0 ].concat(reps));
-                    ii += reps.length;
-                }
-                
-                while (removed.length < howMany) {
-                    var buf = buffers[ii];
-                    var len = buf.length;
-                    var take = Math.min(len, howMany - removed.length);
-                    
-                    if (take === len) {
-                        removed.push(buf);
-                        buffers.splice(ii, 1);
-                    }
-                    else {
-                        removed.push(buf.slice(0, take));
-                        buffers[ii] = buffers[ii].slice(take);
-                    }
-                }
-                
-                this.length -= removed.length;
-                
-                return removed;
-            };
-             
-            Buffers.prototype.slice = function (i, j) {
-                var buffers = this.buffers;
-                if (j === undefined) j = this.length;
-                if (i === undefined) i = 0;
-                
-                if (j > this.length) j = this.length;
-                
-                var startBytes = 0;
-                for (
-                    var si = 0;
-                    si < buffers.length && startBytes + buffers[si].length <= i;
-                    si ++
-                ) { startBytes += buffers[si].length; }
-                
-                var target = new Buffer(j - i);
-                
-                var ti = 0;
-                for (var ii = si; ti < j - i && ii < buffers.length; ii++) {
-                    var len = buffers[ii].length;
-                    
-                    var start = ti === 0 ? i - startBytes : 0;
-                    var end = ti + len >= j - i
-                        ? Math.min(start + (j - i) - ti, len)
-                        : len
-                    ;
-                    
-                    buffers[ii].copy(target, ti, start, end);
-                    ti += end - start;
-                }
-                
-                return target;
-            };
-
-            Buffers.prototype.pos = function (i) {
-                if (i < 0 || i >= this.length) throw new Error('oob');
-                var l = i, bi = 0, bu = null;
-                for (;;) {
-                    bu = this.buffers[bi];
-                    if (l < bu.length) {
-                        return {buf: bi, offset: l};
-                    } else {
-                        l -= bu.length;
-                    }
-                    bi++;
-                }
-            };
-
-            Buffers.prototype.get = function get (i) {
-                var pos = this.pos(i);
-
-                return this.buffers[pos.buf].get(pos.offset);
-            };
-
-            Buffers.prototype.set = function set (i, b) {
-                var pos = this.pos(i);
-
-                return this.buffers[pos.buf].set(pos.offset, b);
-            };
-
-            Buffers.prototype.indexOf = function (needle, offset) {
-                if ("string" === typeof needle) {
-                    needle = new Buffer(needle);
-                } else if (needle instanceof Buffer) ; else {
-                    throw new Error('Invalid type for a search string');
-                }
-
-                if (!needle.length) {
-                    return 0;
-                }
-
-                if (!this.length) {
-                    return -1;
-                }
-
-                var i = 0, j = 0, match = 0, mstart, pos = 0;
-
-                // start search from a particular point in the virtual buffer
-                if (offset) {
-                    var p = this.pos(offset);
-                    i = p.buf;
-                    j = p.offset;
-                    pos = offset;
-                }
-
-                // for each character in virtual buffer
-                for (;;) {
-                    while (j >= this.buffers[i].length) {
-                        j = 0;
-                        i++;
-
-                        if (i >= this.buffers.length) {
-                            // search string not found
-                            return -1;
-                        }
-                    }
-
-                    var char = this.buffers[i][j];
-
-                    if (char == needle[match]) {
-                        // keep track where match started
-                        if (match == 0) {
-                            mstart = {
-                                i: i,
-                                j: j,
-                                pos: pos
-                            };
-                        }
-                        match++;
-                        if (match == needle.length) {
-                            // full match
-                            return mstart.pos;
-                        }
-                    } else if (match != 0) {
-                        // a partial match ended, go back to match starting position
-                        // this will continue the search at the next character
-                        i = mstart.i;
-                        j = mstart.j;
-                        pos = mstart.pos;
-                        match = 0;
-                    }
-
-                    j++;
-                    pos++;
-                }
-            };
-
-            Buffers.prototype.toBuffer = function() {
-                return this.slice();
-            };
-
-            Buffers.prototype.toString = function(encoding, start, end) {
-                return this.slice(start, end).toString(encoding);
-            };
-
-            var debug$2 = require('debug')('ebml:encoder');
-
-            function encodeTag(tagId, tagData, end) {
-              if (end === -1) {
-                return buffers([tagId, Buffer.from('01ffffffffffffff', 'hex'), tagData]);
-              }
-
-              return buffers([tagId, Tools.writeVint(tagData.length), tagData]);
-            }
-            /**
-             * Encodes a raw EBML stream
-             * @class EbmlEncoder
-             * @extends Transform
-             */
-
-
-            var EbmlEncoder =
-            /*#__PURE__*/
-            function (_Transform) {
-              _inherits(EbmlEncoder, _Transform);
-
-              /**
-               * @type {Buffer}
-               * @property
-               * @private
-               */
-
-              /**
-               * @private
-               * @property
-               * @type {Boolean}
-               */
-
-              /**
-               * @private
-               * @property
-               * @type {Array<Tag>}
-               */
-              function EbmlEncoder() {
-                var _this;
-
-                var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
-
-                _classCallCheck(this, EbmlEncoder);
-
-                _this = _possibleConstructorReturn(this, _getPrototypeOf(EbmlEncoder).call(this, _objectSpread({}, options, {
-                  writableObjectMode: true
-                })));
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mBuffer", null);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mCorked", false);
-
-                _defineProperty(_assertThisInitialized(_assertThisInitialized(_this)), "mStack", []);
-
-                return _this;
-              }
-
-              _createClass(EbmlEncoder, [{
-                key: "_transform",
-
-                /**
-                 *
-                 * @param {[string, Tag]} chunk array of chunk data, starting with the tag
-                 * @param {string} enc the encoding type (not used)
-                 * @param {Function} done a callback method to call after the transformation
-                 */
-                value: function _transform(chunk, enc, done) {
-                  var _chunk = _slicedToArray(chunk, 2),
-                      tag = _chunk[0],
-                      _chunk$ = _chunk[1],
-                      data = _chunk$.data,
-                      name = _chunk$.name,
-                      rest = _objectWithoutProperties(_chunk$, ["data", "name"]);
-
-                  if (debug$2.enabled) {
-                    debug$2("encode ".concat(tag, " ").concat(name));
-                  }
-
-                  switch (tag) {
-                    case 'start':
-                      this.startTag(name, _objectSpread({
-                        name: name,
-                        data: data
-                      }, rest));
-                      break;
-
-                    case 'tag':
-                      this.writeTag(name, data);
-                      break;
-
-                    case 'end':
-                      this.endTag();
-                      break;
-
-                    default:
-                      break;
-                  }
-
-                  done();
-                }
-                /**
-                 * @private
-                 * @param {Function} done callback function
-                 */
-
-              }, {
-                key: "flush",
-                value: function flush() {
-                  var done = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : function () {};
-
-                  if (!this.buffer || this.corked) {
-                    if (debug$2.enabled) {
-                      debug$2('no buffer/nothing pending');
-                    }
-
-                    done();
-                    return;
-                  }
-
-                  if (debug$2.enabled) {
-                    debug$2("writing ".concat(this.buffer.length, " bytes"));
-                  } // console.info(`this.buffer.toBuffer = ${this.buffer.buffer}`);
-
-
-                  var chunk = Buffer.from(this.buffer);
-                  this.buffer = null;
-                  this.push(chunk);
-                  done();
-                }
-                /**
-                 * @private
-                 * @param {Buffer | Buffer[]} buffer
-                 */
-
-              }, {
-                key: "bufferAndFlush",
-                value: function bufferAndFlush(buffer) {
-                  if (this.buffer) {
-                    this.buffer = Tools.concatenate(this.buffer, buffer);
-                  } else {
-                    this.buffer = buffers(buffer);
-                  }
-
-                  this.flush();
-                }
-              }, {
-                key: "_flush",
-                value: function _flush() {
-                  var done = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : function () {};
-                  this.flush(done);
-                }
-              }, {
-                key: "_bufferAndFlush",
-                value: function _bufferAndFlush(buffer) {
-                  this.bufferAndFlush(buffer);
-                }
-                /**
-                 * gets the ID of the type of tagName
-                 * @static
-                 * @param  {string} tagName to be looked up
-                 * @return {number}         A buffer containing the schema information
-                 */
-
-              }, {
-                key: "cork",
-                value: function cork() {
-                  this.corked = true;
-                }
-              }, {
-                key: "uncork",
-                value: function uncork() {
-                  this.corked = false;
-                  this.flush();
-                }
-              }, {
-                key: "writeTag",
-                value: function writeTag(tagName, tagData) {
-                  var tagId = EbmlEncoder.getSchemaInfo(tagName);
-
-                  if (!tagId) {
-                    throw new Error("No schema entry found for ".concat(tagName));
-                  }
-
-                  if (tagData) {
-                    var data = encodeTag(tagId, tagData);
-
-                    if (this.stack.length > 0) {
-                      this.stack[this.stack.length - 1].children.push({
-                        data: data
-                      });
-                    } else {
-                      this.bufferAndFlush(data.buffer);
-                    }
-                  }
-                }
-                /**
-                 *
-                 * @param {String} tagName The name of the tag to start
-                 * @param {{end: Number}} info an information object with a `end` parameter
-                 */
-
-              }, {
-                key: "startTag",
-                value: function startTag(tagName, _ref) {
-                  var end = _ref.end;
-                  var tagId = EbmlEncoder.getSchemaInfo(tagName);
-
-                  if (!tagId) {
-                    throw new Error("No schema entry found for ".concat(tagName));
-                  }
-
-                  var tag = {
-                    data: null,
-                    id: tagId,
-                    name: tagName,
-                    end: end,
-                    children: []
-                  };
-
-                  if (this.stack.length > 0) {
-                    this.stack[this.stack.length - 1].children.push(tag);
-                  }
-
-                  this.stack.push(tag);
-                }
-              }, {
-                key: "endTag",
-                value: function endTag() {
-                  var tag = this.stack.pop();
-                  var childTagDataBuffers = tag.children.map(function (child) {
-                    return child.data;
-                  });
-                  tag.data = encodeTag(tag.id, buffers(childTagDataBuffers), tag.end);
-
-                  if (this.stack.length < 1) {
-                    this.bufferAndFlush(tag.data.buffer);
-                  }
-
-                  this.end();
-                }
-              }, {
-                key: "buffer",
-                get: function get() {
-                  return this.mBuffer;
-                },
-                set: function set(buffer) {
-                  this.mBuffer = buffer;
-                }
-              }, {
-                key: "corked",
-                get: function get() {
-                  return this.mCorked;
-                },
-                set: function set(corked) {
-                  this.mCorked = corked;
-                }
-              }, {
-                key: "stack",
-                get: function get() {
-                  return this.mStack;
-                },
-                set: function set(stak) {
-                  this.mStack = stak;
-                }
-              }], [{
-                key: "getSchemaInfo",
-                value: function getSchemaInfo(tagName) {
-                  var tagId = Array.from(schema.keys()).find(function (str) {
-                    return schema.get(str).name === tagName;
-                  });
-
-                  if (tagId) {
-                    return tagId;
-                  }
-
-                  return null;
-                }
-              }]);
-
-              return EbmlEncoder;
-            }(Transform);
-
-            exports.tools = Tools;
-            exports.schema = schema;
-            exports.Decoder = EbmlDecoder;
-            exports.Encoder = EbmlEncoder;
-
-            return exports;
-
-}({}));
-
-
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("buffer").Buffer)
-},{"buffer":3,"debug":32}],38:[function(require,module,exports){
-/**
- * Helpers.
- */
-
-var s = 1000;
-var m = s * 60;
-var h = m * 60;
-var d = h * 24;
-var y = d * 365.25;
-
-/**
- * Parse or format the given `val`.
- *
- * Options:
- *
- *  - `long` verbose formatting [false]
- *
- * @param {String|Number} val
- * @param {Object} [options]
- * @throws {Error} throw an error if val is not a non-empty string or a number
- * @return {String|Number}
- * @api public
- */
-
-module.exports = function(val, options) {
-  options = options || {};
-  var type = typeof val;
-  if (type === 'string' && val.length > 0) {
-    return parse(val);
-  } else if (type === 'number' && isNaN(val) === false) {
-    return options.long ? fmtLong(val) : fmtShort(val);
-  }
-  throw new Error(
-    'val is not a non-empty string or a valid number. val=' +
-      JSON.stringify(val)
-  );
-};
-
-/**
- * Parse the given `str` and return milliseconds.
- *
- * @param {String} str
- * @return {Number}
- * @api private
- */
-
-function parse(str) {
-  str = String(str);
-  if (str.length > 100) {
-    return;
-  }
-  var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(
-    str
-  );
-  if (!match) {
-    return;
-  }
-  var n = parseFloat(match[1]);
-  var type = (match[2] || 'ms').toLowerCase();
-  switch (type) {
-    case 'years':
-    case 'year':
-    case 'yrs':
-    case 'yr':
-    case 'y':
-      return n * y;
-    case 'days':
-    case 'day':
-    case 'd':
-      return n * d;
-    case 'hours':
-    case 'hour':
-    case 'hrs':
-    case 'hr':
-    case 'h':
-      return n * h;
-    case 'minutes':
-    case 'minute':
-    case 'mins':
-    case 'min':
-    case 'm':
-      return n * m;
-    case 'seconds':
-    case 'second':
-    case 'secs':
-    case 'sec':
-    case 's':
-      return n * s;
-    case 'milliseconds':
-    case 'millisecond':
-    case 'msecs':
-    case 'msec':
-    case 'ms':
-      return n;
-    default:
-      return undefined;
-  }
-}
-
-/**
- * Short format for `ms`.
- *
- * @param {Number} ms
- * @return {String}
- * @api private
- */
-
-function fmtShort(ms) {
-  if (ms >= d) {
-    return Math.round(ms / d) + 'd';
-  }
-  if (ms >= h) {
-    return Math.round(ms / h) + 'h';
-  }
-  if (ms >= m) {
-    return Math.round(ms / m) + 'm';
-  }
-  if (ms >= s) {
-    return Math.round(ms / s) + 's';
-  }
-  return ms + 'ms';
-}
-
-/**
- * Long format for `ms`.
- *
- * @param {Number} ms
- * @return {String}
- * @api private
- */
-
-function fmtLong(ms) {
-  return plural(ms, d, 'day') ||
-    plural(ms, h, 'hour') ||
-    plural(ms, m, 'minute') ||
-    plural(ms, s, 'second') ||
-    ms + ' ms';
-}
-
-/**
- * Pluralization helper.
- */
-
-function plural(ms, n, name) {
-  if (ms < n) {
-    return;
-  }
-  if (ms < n * 1.5) {
-    return Math.floor(ms / n) + ' ' + name;
-  }
-  return Math.ceil(ms / n) + ' ' + name + 's';
-}
-
-},{}]},{},[30]);
diff --git a/index3.js b/index3.js
deleted file mode 100644
index 0895ac4..0000000
--- a/index3.js
+++ /dev/null
@@ -1,10146 +0,0 @@
-(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
-
-},{}],2:[function(require,module,exports){
-'use strict'
-
-exports.byteLength = byteLength
-exports.toByteArray = toByteArray
-exports.fromByteArray = fromByteArray
-
-var lookup = []
-var revLookup = []
-var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
-
-var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
-for (var i = 0, len = code.length; i < len; ++i) {
-  lookup[i] = code[i]
-  revLookup[code.charCodeAt(i)] = i
-}
-
-// Support decoding URL-safe base64 strings, as Node.js does.
-// See: https://en.wikipedia.org/wiki/Base64#URL_applications
-revLookup['-'.charCodeAt(0)] = 62
-revLookup['_'.charCodeAt(0)] = 63
-
-function getLens (b64) {
-  var len = b64.length
-
-  if (len % 4 > 0) {
-    throw new Error('Invalid string. Length must be a multiple of 4')
-  }
-
-  // Trim off extra bytes after placeholder bytes are found
-  // See: https://github.com/beatgammit/base64-js/issues/42
-  var validLen = b64.indexOf('=')
-  if (validLen === -1) validLen = len
-
-  var placeHoldersLen = validLen === len
-    ? 0
-    : 4 - (validLen % 4)
-
-  return [validLen, placeHoldersLen]
-}
-
-// base64 is 4/3 + up to two characters of the original data
-function byteLength (b64) {
-  var lens = getLens(b64)
-  var validLen = lens[0]
-  var placeHoldersLen = lens[1]
-  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
-}
-
-function _byteLength (b64, validLen, placeHoldersLen) {
-  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
-}
-
-function toByteArray (b64) {
-  var tmp
-  var lens = getLens(b64)
-  var validLen = lens[0]
-  var placeHoldersLen = lens[1]
-
-  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
-
-  var curByte = 0
-
-  // if there are placeholders, only get up to the last complete 4 chars
-  var len = placeHoldersLen > 0
-    ? validLen - 4
-    : validLen
-
-  var i
-  for (i = 0; i < len; i += 4) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 18) |
-      (revLookup[b64.charCodeAt(i + 1)] << 12) |
-      (revLookup[b64.charCodeAt(i + 2)] << 6) |
-      revLookup[b64.charCodeAt(i + 3)]
-    arr[curByte++] = (tmp >> 16) & 0xFF
-    arr[curByte++] = (tmp >> 8) & 0xFF
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  if (placeHoldersLen === 2) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 2) |
-      (revLookup[b64.charCodeAt(i + 1)] >> 4)
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  if (placeHoldersLen === 1) {
-    tmp =
-      (revLookup[b64.charCodeAt(i)] << 10) |
-      (revLookup[b64.charCodeAt(i + 1)] << 4) |
-      (revLookup[b64.charCodeAt(i + 2)] >> 2)
-    arr[curByte++] = (tmp >> 8) & 0xFF
-    arr[curByte++] = tmp & 0xFF
-  }
-
-  return arr
-}
-
-function tripletToBase64 (num) {
-  return lookup[num >> 18 & 0x3F] +
-    lookup[num >> 12 & 0x3F] +
-    lookup[num >> 6 & 0x3F] +
-    lookup[num & 0x3F]
-}
-
-function encodeChunk (uint8, start, end) {
-  var tmp
-  var output = []
-  for (var i = start; i < end; i += 3) {
-    tmp =
-      ((uint8[i] << 16) & 0xFF0000) +
-      ((uint8[i + 1] << 8) & 0xFF00) +
-      (uint8[i + 2] & 0xFF)
-    output.push(tripletToBase64(tmp))
-  }
-  return output.join('')
-}
-
-function fromByteArray (uint8) {
-  var tmp
-  var len = uint8.length
-  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
-  var parts = []
-  var maxChunkLength = 16383 // must be multiple of 3
-
-  // go through the array every three bytes, we'll deal with trailing stuff later
-  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
-    parts.push(encodeChunk(
-      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)
-    ))
-  }
-
-  // pad the end with zeros, but make sure to not forget the extra bytes
-  if (extraBytes === 1) {
-    tmp = uint8[len - 1]
-    parts.push(
-      lookup[tmp >> 2] +
-      lookup[(tmp << 4) & 0x3F] +
-      '=='
-    )
-  } else if (extraBytes === 2) {
-    tmp = (uint8[len - 2] << 8) + uint8[len - 1]
-    parts.push(
-      lookup[tmp >> 10] +
-      lookup[(tmp >> 4) & 0x3F] +
-      lookup[(tmp << 2) & 0x3F] +
-      '='
-    )
-  }
-
-  return parts.join('')
-}
-
-},{}],3:[function(require,module,exports){
-arguments[4][1][0].apply(exports,arguments)
-},{"dup":1}],4:[function(require,module,exports){
-(function (Buffer){
-/*!
- * The buffer module from node.js, for the browser.
- *
- * @author   Feross Aboukhadijeh <https://feross.org>
- * @license  MIT
- */
-/* eslint-disable no-proto */
-
-'use strict'
-
-var base64 = require('base64-js')
-var ieee754 = require('ieee754')
-
-exports.Buffer = Buffer
-exports.SlowBuffer = SlowBuffer
-exports.INSPECT_MAX_BYTES = 50
-
-var K_MAX_LENGTH = 0x7fffffff
-exports.kMaxLength = K_MAX_LENGTH
-
-/**
- * If `Buffer.TYPED_ARRAY_SUPPORT`:
- *   === true    Use Uint8Array implementation (fastest)
- *   === false   Print warning and recommend using `buffer` v4.x which has an Object
- *               implementation (most compatible, even IE6)
- *
- * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
- * Opera 11.6+, iOS 4.2+.
- *
- * We report that the browser does not support typed arrays if the are not subclassable
- * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
- * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
- * for __proto__ and has a buggy typed array implementation.
- */
-Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
-
-if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
-    typeof console.error === 'function') {
-  console.error(
-    'This browser lacks typed array (Uint8Array) support which is required by ' +
-    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
-  )
-}
-
-function typedArraySupport () {
-  // Can typed array instances can be augmented?
-  try {
-    var arr = new Uint8Array(1)
-    arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
-    return arr.foo() === 42
-  } catch (e) {
-    return false
-  }
-}
-
-Object.defineProperty(Buffer.prototype, 'parent', {
-  enumerable: true,
-  get: function () {
-    if (!Buffer.isBuffer(this)) return undefined
-    return this.buffer
-  }
-})
-
-Object.defineProperty(Buffer.prototype, 'offset', {
-  enumerable: true,
-  get: function () {
-    if (!Buffer.isBuffer(this)) return undefined
-    return this.byteOffset
-  }
-})
-
-function createBuffer (length) {
-  if (length > K_MAX_LENGTH) {
-    throw new RangeError('The value "' + length + '" is invalid for option "size"')
-  }
-  // Return an augmented `Uint8Array` instance
-  var buf = new Uint8Array(length)
-  buf.__proto__ = Buffer.prototype
-  return buf
-}
-
-/**
- * The Buffer constructor returns instances of `Uint8Array` that have their
- * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
- * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
- * and the `Uint8Array` methods. Square bracket notation works as expected -- it
- * returns a single octet.
- *
- * The `Uint8Array` prototype remains unmodified.
- */
-
-function Buffer (arg, encodingOrOffset, length) {
-  // Common case.
-  if (typeof arg === 'number') {
-    if (typeof encodingOrOffset === 'string') {
-      throw new TypeError(
-        'The "string" argument must be of type string. Received type number'
-      )
-    }
-    return allocUnsafe(arg)
-  }
-  return from(arg, encodingOrOffset, length)
-}
-
-// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
-if (typeof Symbol !== 'undefined' && Symbol.species != null &&
-    Buffer[Symbol.species] === Buffer) {
-  Object.defineProperty(Buffer, Symbol.species, {
-    value: null,
-    configurable: true,
-    enumerable: false,
-    writable: false
-  })
-}
-
-Buffer.poolSize = 8192 // not used by this implementation
-
-function from (value, encodingOrOffset, length) {
-  if (typeof value === 'string') {
-    return fromString(value, encodingOrOffset)
-  }
-
-  if (ArrayBuffer.isView(value)) {
-    return fromArrayLike(value)
-  }
-
-  if (value == null) {
-    throw TypeError(
-      'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
-      'or Array-like Object. Received type ' + (typeof value)
-    )
-  }
-
-  if (isInstance(value, ArrayBuffer) ||
-      (value && isInstance(value.buffer, ArrayBuffer))) {
-    return fromArrayBuffer(value, encodingOrOffset, length)
-  }
-
-  if (typeof value === 'number') {
-    throw new TypeError(
-      'The "value" argument must not be of type number. Received type number'
-    )
-  }
-
-  var valueOf = value.valueOf && value.valueOf()
-  if (valueOf != null && valueOf !== value) {
-    return Buffer.from(valueOf, encodingOrOffset, length)
-  }
-
-  var b = fromObject(value)
-  if (b) return b
-
-  if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
-      typeof value[Symbol.toPrimitive] === 'function') {
-    return Buffer.from(
-      value[Symbol.toPrimitive]('string'), encodingOrOffset, length
-    )
-  }
-
-  throw new TypeError(
-    'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
-    'or Array-like Object. Received type ' + (typeof value)
-  )
-}
-
-/**
- * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
- * if value is a number.
- * Buffer.from(str[, encoding])
- * Buffer.from(array)
- * Buffer.from(buffer)
- * Buffer.from(arrayBuffer[, byteOffset[, length]])
- **/
-Buffer.from = function (value, encodingOrOffset, length) {
-  return from(value, encodingOrOffset, length)
-}
-
-// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
-// https://github.com/feross/buffer/pull/148
-Buffer.prototype.__proto__ = Uint8Array.prototype
-Buffer.__proto__ = Uint8Array
-
-function assertSize (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('"size" argument must be of type number')
-  } else if (size < 0) {
-    throw new RangeError('The value "' + size + '" is invalid for option "size"')
-  }
-}
-
-function alloc (size, fill, encoding) {
-  assertSize(size)
-  if (size <= 0) {
-    return createBuffer(size)
-  }
-  if (fill !== undefined) {
-    // Only pay attention to encoding if it's a string. This
-    // prevents accidentally sending in a number that would
-    // be interpretted as a start offset.
-    return typeof encoding === 'string'
-      ? createBuffer(size).fill(fill, encoding)
-      : createBuffer(size).fill(fill)
-  }
-  return createBuffer(size)
-}
-
-/**
- * Creates a new filled Buffer instance.
- * alloc(size[, fill[, encoding]])
- **/
-Buffer.alloc = function (size, fill, encoding) {
-  return alloc(size, fill, encoding)
-}
-
-function allocUnsafe (size) {
-  assertSize(size)
-  return createBuffer(size < 0 ? 0 : checked(size) | 0)
-}
-
-/**
- * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
- * */
-Buffer.allocUnsafe = function (size) {
-  return allocUnsafe(size)
-}
-/**
- * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
- */
-Buffer.allocUnsafeSlow = function (size) {
-  return allocUnsafe(size)
-}
-
-function fromString (string, encoding) {
-  if (typeof encoding !== 'string' || encoding === '') {
-    encoding = 'utf8'
-  }
-
-  if (!Buffer.isEncoding(encoding)) {
-    throw new TypeError('Unknown encoding: ' + encoding)
-  }
-
-  var length = byteLength(string, encoding) | 0
-  var buf = createBuffer(length)
-
-  var actual = buf.write(string, encoding)
-
-  if (actual !== length) {
-    // Writing a hex string, for example, that contains invalid characters will
-    // cause everything after the first invalid character to be ignored. (e.g.
-    // 'abxxcd' will be treated as 'ab')
-    buf = buf.slice(0, actual)
-  }
-
-  return buf
-}
-
-function fromArrayLike (array) {
-  var length = array.length < 0 ? 0 : checked(array.length) | 0
-  var buf = createBuffer(length)
-  for (var i = 0; i < length; i += 1) {
-    buf[i] = array[i] & 255
-  }
-  return buf
-}
-
-function fromArrayBuffer (array, byteOffset, length) {
-  if (byteOffset < 0 || array.byteLength < byteOffset) {
-    throw new RangeError('"offset" is outside of buffer bounds')
-  }
-
-  if (array.byteLength < byteOffset + (length || 0)) {
-    throw new RangeError('"length" is outside of buffer bounds')
-  }
-
-  var buf
-  if (byteOffset === undefined && length === undefined) {
-    buf = new Uint8Array(array)
-  } else if (length === undefined) {
-    buf = new Uint8Array(array, byteOffset)
-  } else {
-    buf = new Uint8Array(array, byteOffset, length)
-  }
-
-  // Return an augmented `Uint8Array` instance
-  buf.__proto__ = Buffer.prototype
-  return buf
-}
-
-function fromObject (obj) {
-  if (Buffer.isBuffer(obj)) {
-    var len = checked(obj.length) | 0
-    var buf = createBuffer(len)
-
-    if (buf.length === 0) {
-      return buf
-    }
-
-    obj.copy(buf, 0, 0, len)
-    return buf
-  }
-
-  if (obj.length !== undefined) {
-    if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
-      return createBuffer(0)
-    }
-    return fromArrayLike(obj)
-  }
-
-  if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
-    return fromArrayLike(obj.data)
-  }
-}
-
-function checked (length) {
-  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
-  // length is NaN (which is otherwise coerced to zero.)
-  if (length >= K_MAX_LENGTH) {
-    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
-                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
-  }
-  return length | 0
-}
-
-function SlowBuffer (length) {
-  if (+length != length) { // eslint-disable-line eqeqeq
-    length = 0
-  }
-  return Buffer.alloc(+length)
-}
-
-Buffer.isBuffer = function isBuffer (b) {
-  return b != null && b._isBuffer === true &&
-    b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
-}
-
-Buffer.compare = function compare (a, b) {
-  if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
-  if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
-  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
-    throw new TypeError(
-      'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
-    )
-  }
-
-  if (a === b) return 0
-
-  var x = a.length
-  var y = b.length
-
-  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
-    if (a[i] !== b[i]) {
-      x = a[i]
-      y = b[i]
-      break
-    }
-  }
-
-  if (x < y) return -1
-  if (y < x) return 1
-  return 0
-}
-
-Buffer.isEncoding = function isEncoding (encoding) {
-  switch (String(encoding).toLowerCase()) {
-    case 'hex':
-    case 'utf8':
-    case 'utf-8':
-    case 'ascii':
-    case 'latin1':
-    case 'binary':
-    case 'base64':
-    case 'ucs2':
-    case 'ucs-2':
-    case 'utf16le':
-    case 'utf-16le':
-      return true
-    default:
-      return false
-  }
-}
-
-Buffer.concat = function concat (list, length) {
-  if (!Array.isArray(list)) {
-    throw new TypeError('"list" argument must be an Array of Buffers')
-  }
-
-  if (list.length === 0) {
-    return Buffer.alloc(0)
-  }
-
-  var i
-  if (length === undefined) {
-    length = 0
-    for (i = 0; i < list.length; ++i) {
-      length += list[i].length
-    }
-  }
-
-  var buffer = Buffer.allocUnsafe(length)
-  var pos = 0
-  for (i = 0; i < list.length; ++i) {
-    var buf = list[i]
-    if (isInstance(buf, Uint8Array)) {
-      buf = Buffer.from(buf)
-    }
-    if (!Buffer.isBuffer(buf)) {
-      throw new TypeError('"list" argument must be an Array of Buffers')
-    }
-    buf.copy(buffer, pos)
-    pos += buf.length
-  }
-  return buffer
-}
-
-function byteLength (string, encoding) {
-  if (Buffer.isBuffer(string)) {
-    return string.length
-  }
-  if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
-    return string.byteLength
-  }
-  if (typeof string !== 'string') {
-    throw new TypeError(
-      'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
-      'Received type ' + typeof string
-    )
-  }
-
-  var len = string.length
-  var mustMatch = (arguments.length > 2 && arguments[2] === true)
-  if (!mustMatch && len === 0) return 0
-
-  // Use a for loop to avoid recursion
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'ascii':
-      case 'latin1':
-      case 'binary':
-        return len
-      case 'utf8':
-      case 'utf-8':
-        return utf8ToBytes(string).length
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return len * 2
-      case 'hex':
-        return len >>> 1
-      case 'base64':
-        return base64ToBytes(string).length
-      default:
-        if (loweredCase) {
-          return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
-        }
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-Buffer.byteLength = byteLength
-
-function slowToString (encoding, start, end) {
-  var loweredCase = false
-
-  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
-  // property of a typed array.
-
-  // This behaves neither like String nor Uint8Array in that we set start/end
-  // to their upper/lower bounds if the value passed is out of range.
-  // undefined is handled specially as per ECMA-262 6th Edition,
-  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
-  if (start === undefined || start < 0) {
-    start = 0
-  }
-  // Return early if start > this.length. Done here to prevent potential uint32
-  // coercion fail below.
-  if (start > this.length) {
-    return ''
-  }
-
-  if (end === undefined || end > this.length) {
-    end = this.length
-  }
-
-  if (end <= 0) {
-    return ''
-  }
-
-  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
-  end >>>= 0
-  start >>>= 0
-
-  if (end <= start) {
-    return ''
-  }
-
-  if (!encoding) encoding = 'utf8'
-
-  while (true) {
-    switch (encoding) {
-      case 'hex':
-        return hexSlice(this, start, end)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Slice(this, start, end)
-
-      case 'ascii':
-        return asciiSlice(this, start, end)
-
-      case 'latin1':
-      case 'binary':
-        return latin1Slice(this, start, end)
-
-      case 'base64':
-        return base64Slice(this, start, end)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return utf16leSlice(this, start, end)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = (encoding + '').toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
-// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
-// reliably in a browserify context because there could be multiple different
-// copies of the 'buffer' package in use. This method works even for Buffer
-// instances that were created from another copy of the `buffer` package.
-// See: https://github.com/feross/buffer/issues/154
-Buffer.prototype._isBuffer = true
-
-function swap (b, n, m) {
-  var i = b[n]
-  b[n] = b[m]
-  b[m] = i
-}
-
-Buffer.prototype.swap16 = function swap16 () {
-  var len = this.length
-  if (len % 2 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 16-bits')
-  }
-  for (var i = 0; i < len; i += 2) {
-    swap(this, i, i + 1)
-  }
-  return this
-}
-
-Buffer.prototype.swap32 = function swap32 () {
-  var len = this.length
-  if (len % 4 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 32-bits')
-  }
-  for (var i = 0; i < len; i += 4) {
-    swap(this, i, i + 3)
-    swap(this, i + 1, i + 2)
-  }
-  return this
-}
-
-Buffer.prototype.swap64 = function swap64 () {
-  var len = this.length
-  if (len % 8 !== 0) {
-    throw new RangeError('Buffer size must be a multiple of 64-bits')
-  }
-  for (var i = 0; i < len; i += 8) {
-    swap(this, i, i + 7)
-    swap(this, i + 1, i + 6)
-    swap(this, i + 2, i + 5)
-    swap(this, i + 3, i + 4)
-  }
-  return this
-}
-
-Buffer.prototype.toString = function toString () {
-  var length = this.length
-  if (length === 0) return ''
-  if (arguments.length === 0) return utf8Slice(this, 0, length)
-  return slowToString.apply(this, arguments)
-}
-
-Buffer.prototype.toLocaleString = Buffer.prototype.toString
-
-Buffer.prototype.equals = function equals (b) {
-  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
-  if (this === b) return true
-  return Buffer.compare(this, b) === 0
-}
-
-Buffer.prototype.inspect = function inspect () {
-  var str = ''
-  var max = exports.INSPECT_MAX_BYTES
-  str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
-  if (this.length > max) str += ' ... '
-  return '<Buffer ' + str + '>'
-}
-
-Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
-  if (isInstance(target, Uint8Array)) {
-    target = Buffer.from(target, target.offset, target.byteLength)
-  }
-  if (!Buffer.isBuffer(target)) {
-    throw new TypeError(
-      'The "target" argument must be one of type Buffer or Uint8Array. ' +
-      'Received type ' + (typeof target)
-    )
-  }
-
-  if (start === undefined) {
-    start = 0
-  }
-  if (end === undefined) {
-    end = target ? target.length : 0
-  }
-  if (thisStart === undefined) {
-    thisStart = 0
-  }
-  if (thisEnd === undefined) {
-    thisEnd = this.length
-  }
-
-  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
-    throw new RangeError('out of range index')
-  }
-
-  if (thisStart >= thisEnd && start >= end) {
-    return 0
-  }
-  if (thisStart >= thisEnd) {
-    return -1
-  }
-  if (start >= end) {
-    return 1
-  }
-
-  start >>>= 0
-  end >>>= 0
-  thisStart >>>= 0
-  thisEnd >>>= 0
-
-  if (this === target) return 0
-
-  var x = thisEnd - thisStart
-  var y = end - start
-  var len = Math.min(x, y)
-
-  var thisCopy = this.slice(thisStart, thisEnd)
-  var targetCopy = target.slice(start, end)
-
-  for (var i = 0; i < len; ++i) {
-    if (thisCopy[i] !== targetCopy[i]) {
-      x = thisCopy[i]
-      y = targetCopy[i]
-      break
-    }
-  }
-
-  if (x < y) return -1
-  if (y < x) return 1
-  return 0
-}
-
-// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
-// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
-//
-// Arguments:
-// - buffer - a Buffer to search
-// - val - a string, Buffer, or number
-// - byteOffset - an index into `buffer`; will be clamped to an int32
-// - encoding - an optional encoding, relevant is val is a string
-// - dir - true for indexOf, false for lastIndexOf
-function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
-  // Empty buffer means no match
-  if (buffer.length === 0) return -1
-
-  // Normalize byteOffset
-  if (typeof byteOffset === 'string') {
-    encoding = byteOffset
-    byteOffset = 0
-  } else if (byteOffset > 0x7fffffff) {
-    byteOffset = 0x7fffffff
-  } else if (byteOffset < -0x80000000) {
-    byteOffset = -0x80000000
-  }
-  byteOffset = +byteOffset // Coerce to Number.
-  if (numberIsNaN(byteOffset)) {
-    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
-    byteOffset = dir ? 0 : (buffer.length - 1)
-  }
-
-  // Normalize byteOffset: negative offsets start from the end of the buffer
-  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
-  if (byteOffset >= buffer.length) {
-    if (dir) return -1
-    else byteOffset = buffer.length - 1
-  } else if (byteOffset < 0) {
-    if (dir) byteOffset = 0
-    else return -1
-  }
-
-  // Normalize val
-  if (typeof val === 'string') {
-    val = Buffer.from(val, encoding)
-  }
-
-  // Finally, search either indexOf (if dir is true) or lastIndexOf
-  if (Buffer.isBuffer(val)) {
-    // Special case: looking for empty string/buffer always fails
-    if (val.length === 0) {
-      return -1
-    }
-    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
-  } else if (typeof val === 'number') {
-    val = val & 0xFF // Search for a byte value [0-255]
-    if (typeof Uint8Array.prototype.indexOf === 'function') {
-      if (dir) {
-        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
-      } else {
-        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
-      }
-    }
-    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
-  }
-
-  throw new TypeError('val must be string, number or Buffer')
-}
-
-function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
-  var indexSize = 1
-  var arrLength = arr.length
-  var valLength = val.length
-
-  if (encoding !== undefined) {
-    encoding = String(encoding).toLowerCase()
-    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
-        encoding === 'utf16le' || encoding === 'utf-16le') {
-      if (arr.length < 2 || val.length < 2) {
-        return -1
-      }
-      indexSize = 2
-      arrLength /= 2
-      valLength /= 2
-      byteOffset /= 2
-    }
-  }
-
-  function read (buf, i) {
-    if (indexSize === 1) {
-      return buf[i]
-    } else {
-      return buf.readUInt16BE(i * indexSize)
-    }
-  }
-
-  var i
-  if (dir) {
-    var foundIndex = -1
-    for (i = byteOffset; i < arrLength; i++) {
-      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
-        if (foundIndex === -1) foundIndex = i
-        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
-      } else {
-        if (foundIndex !== -1) i -= i - foundIndex
-        foundIndex = -1
-      }
-    }
-  } else {
-    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
-    for (i = byteOffset; i >= 0; i--) {
-      var found = true
-      for (var j = 0; j < valLength; j++) {
-        if (read(arr, i + j) !== read(val, j)) {
-          found = false
-          break
-        }
-      }
-      if (found) return i
-    }
-  }
-
-  return -1
-}
-
-Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
-  return this.indexOf(val, byteOffset, encoding) !== -1
-}
-
-Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
-  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
-}
-
-Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
-  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
-}
-
-function hexWrite (buf, string, offset, length) {
-  offset = Number(offset) || 0
-  var remaining = buf.length - offset
-  if (!length) {
-    length = remaining
-  } else {
-    length = Number(length)
-    if (length > remaining) {
-      length = remaining
-    }
-  }
-
-  var strLen = string.length
-
-  if (length > strLen / 2) {
-    length = strLen / 2
-  }
-  for (var i = 0; i < length; ++i) {
-    var parsed = parseInt(string.substr(i * 2, 2), 16)
-    if (numberIsNaN(parsed)) return i
-    buf[offset + i] = parsed
-  }
-  return i
-}
-
-function utf8Write (buf, string, offset, length) {
-  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-function asciiWrite (buf, string, offset, length) {
-  return blitBuffer(asciiToBytes(string), buf, offset, length)
-}
-
-function latin1Write (buf, string, offset, length) {
-  return asciiWrite(buf, string, offset, length)
-}
-
-function base64Write (buf, string, offset, length) {
-  return blitBuffer(base64ToBytes(string), buf, offset, length)
-}
-
-function ucs2Write (buf, string, offset, length) {
-  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
-}
-
-Buffer.prototype.write = function write (string, offset, length, encoding) {
-  // Buffer#write(string)
-  if (offset === undefined) {
-    encoding = 'utf8'
-    length = this.length
-    offset = 0
-  // Buffer#write(string, encoding)
-  } else if (length === undefined && typeof offset === 'string') {
-    encoding = offset
-    length = this.length
-    offset = 0
-  // Buffer#write(string, offset[, length][, encoding])
-  } else if (isFinite(offset)) {
-    offset = offset >>> 0
-    if (isFinite(length)) {
-      length = length >>> 0
-      if (encoding === undefined) encoding = 'utf8'
-    } else {
-      encoding = length
-      length = undefined
-    }
-  } else {
-    throw new Error(
-      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
-    )
-  }
-
-  var remaining = this.length - offset
-  if (length === undefined || length > remaining) length = remaining
-
-  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
-    throw new RangeError('Attempt to write outside buffer bounds')
-  }
-
-  if (!encoding) encoding = 'utf8'
-
-  var loweredCase = false
-  for (;;) {
-    switch (encoding) {
-      case 'hex':
-        return hexWrite(this, string, offset, length)
-
-      case 'utf8':
-      case 'utf-8':
-        return utf8Write(this, string, offset, length)
-
-      case 'ascii':
-        return asciiWrite(this, string, offset, length)
-
-      case 'latin1':
-      case 'binary':
-        return latin1Write(this, string, offset, length)
-
-      case 'base64':
-        // Warning: maxLength not taken into account in base64Write
-        return base64Write(this, string, offset, length)
-
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return ucs2Write(this, string, offset, length)
-
-      default:
-        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
-        encoding = ('' + encoding).toLowerCase()
-        loweredCase = true
-    }
-  }
-}
-
-Buffer.prototype.toJSON = function toJSON () {
-  return {
-    type: 'Buffer',
-    data: Array.prototype.slice.call(this._arr || this, 0)
-  }
-}
-
-function base64Slice (buf, start, end) {
-  if (start === 0 && end === buf.length) {
-    return base64.fromByteArray(buf)
-  } else {
-    return base64.fromByteArray(buf.slice(start, end))
-  }
-}
-
-function utf8Slice (buf, start, end) {
-  end = Math.min(buf.length, end)
-  var res = []
-
-  var i = start
-  while (i < end) {
-    var firstByte = buf[i]
-    var codePoint = null
-    var bytesPerSequence = (firstByte > 0xEF) ? 4
-      : (firstByte > 0xDF) ? 3
-        : (firstByte > 0xBF) ? 2
-          : 1
-
-    if (i + bytesPerSequence <= end) {
-      var secondByte, thirdByte, fourthByte, tempCodePoint
-
-      switch (bytesPerSequence) {
-        case 1:
-          if (firstByte < 0x80) {
-            codePoint = firstByte
-          }
-          break
-        case 2:
-          secondByte = buf[i + 1]
-          if ((secondByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
-            if (tempCodePoint > 0x7F) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 3:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
-            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
-              codePoint = tempCodePoint
-            }
-          }
-          break
-        case 4:
-          secondByte = buf[i + 1]
-          thirdByte = buf[i + 2]
-          fourthByte = buf[i + 3]
-          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
-            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
-            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
-              codePoint = tempCodePoint
-            }
-          }
-      }
-    }
-
-    if (codePoint === null) {
-      // we did not generate a valid codePoint so insert a
-      // replacement char (U+FFFD) and advance only 1 byte
-      codePoint = 0xFFFD
-      bytesPerSequence = 1
-    } else if (codePoint > 0xFFFF) {
-      // encode to utf16 (surrogate pair dance)
-      codePoint -= 0x10000
-      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
-      codePoint = 0xDC00 | codePoint & 0x3FF
-    }
-
-    res.push(codePoint)
-    i += bytesPerSequence
-  }
-
-  return decodeCodePointsArray(res)
-}
-
-// Based on http://stackoverflow.com/a/22747272/680742, the browser with
-// the lowest limit is Chrome, with 0x10000 args.
-// We go 1 magnitude less, for safety
-var MAX_ARGUMENTS_LENGTH = 0x1000
-
-function decodeCodePointsArray (codePoints) {
-  var len = codePoints.length
-  if (len <= MAX_ARGUMENTS_LENGTH) {
-    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
-  }
-
-  // Decode in chunks to avoid "call stack size exceeded".
-  var res = ''
-  var i = 0
-  while (i < len) {
-    res += String.fromCharCode.apply(
-      String,
-      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
-    )
-  }
-  return res
-}
-
-function asciiSlice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; ++i) {
-    ret += String.fromCharCode(buf[i] & 0x7F)
-  }
-  return ret
-}
-
-function latin1Slice (buf, start, end) {
-  var ret = ''
-  end = Math.min(buf.length, end)
-
-  for (var i = start; i < end; ++i) {
-    ret += String.fromCharCode(buf[i])
-  }
-  return ret
-}
-
-function hexSlice (buf, start, end) {
-  var len = buf.length
-
-  if (!start || start < 0) start = 0
-  if (!end || end < 0 || end > len) end = len
-
-  var out = ''
-  for (var i = start; i < end; ++i) {
-    out += toHex(buf[i])
-  }
-  return out
-}
-
-function utf16leSlice (buf, start, end) {
-  var bytes = buf.slice(start, end)
-  var res = ''
-  for (var i = 0; i < bytes.length; i += 2) {
-    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
-  }
-  return res
-}
-
-Buffer.prototype.slice = function slice (start, end) {
-  var len = this.length
-  start = ~~start
-  end = end === undefined ? len : ~~end
-
-  if (start < 0) {
-    start += len
-    if (start < 0) start = 0
-  } else if (start > len) {
-    start = len
-  }
-
-  if (end < 0) {
-    end += len
-    if (end < 0) end = 0
-  } else if (end > len) {
-    end = len
-  }
-
-  if (end < start) end = start
-
-  var newBuf = this.subarray(start, end)
-  // Return an augmented `Uint8Array` instance
-  newBuf.__proto__ = Buffer.prototype
-  return newBuf
-}
-
-/*
- * Need to make sure that buffer isn't trying to write out of bounds.
- */
-function checkOffset (offset, ext, length) {
-  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
-  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
-}
-
-Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var val = this[offset]
-  var mul = 1
-  var i = 0
-  while (++i < byteLength && (mul *= 0x100)) {
-    val += this[offset + i] * mul
-  }
-
-  return val
-}
-
-Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    checkOffset(offset, byteLength, this.length)
-  }
-
-  var val = this[offset + --byteLength]
-  var mul = 1
-  while (byteLength > 0 && (mul *= 0x100)) {
-    val += this[offset + --byteLength] * mul
-  }
-
-  return val
-}
-
-Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 1, this.length)
-  return this[offset]
-}
-
-Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  return this[offset] | (this[offset + 1] << 8)
-}
-
-Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  return (this[offset] << 8) | this[offset + 1]
-}
-
-Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return ((this[offset]) |
-      (this[offset + 1] << 8) |
-      (this[offset + 2] << 16)) +
-      (this[offset + 3] * 0x1000000)
-}
-
-Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset] * 0x1000000) +
-    ((this[offset + 1] << 16) |
-    (this[offset + 2] << 8) |
-    this[offset + 3])
-}
-
-Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var val = this[offset]
-  var mul = 1
-  var i = 0
-  while (++i < byteLength && (mul *= 0x100)) {
-    val += this[offset + i] * mul
-  }
-  mul *= 0x80
-
-  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-  return val
-}
-
-Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) checkOffset(offset, byteLength, this.length)
-
-  var i = byteLength
-  var mul = 1
-  var val = this[offset + --i]
-  while (i > 0 && (mul *= 0x100)) {
-    val += this[offset + --i] * mul
-  }
-  mul *= 0x80
-
-  if (val >= mul) val -= Math.pow(2, 8 * byteLength)
-
-  return val
-}
-
-Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 1, this.length)
-  if (!(this[offset] & 0x80)) return (this[offset])
-  return ((0xff - this[offset] + 1) * -1)
-}
-
-Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  var val = this[offset] | (this[offset + 1] << 8)
-  return (val & 0x8000) ? val | 0xFFFF0000 : val
-}
-
-Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 2, this.length)
-  var val = this[offset + 1] | (this[offset] << 8)
-  return (val & 0x8000) ? val | 0xFFFF0000 : val
-}
-
-Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset]) |
-    (this[offset + 1] << 8) |
-    (this[offset + 2] << 16) |
-    (this[offset + 3] << 24)
-}
-
-Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-
-  return (this[offset] << 24) |
-    (this[offset + 1] << 16) |
-    (this[offset + 2] << 8) |
-    (this[offset + 3])
-}
-
-Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-  return ieee754.read(this, offset, true, 23, 4)
-}
-
-Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 4, this.length)
-  return ieee754.read(this, offset, false, 23, 4)
-}
-
-Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 8, this.length)
-  return ieee754.read(this, offset, true, 52, 8)
-}
-
-Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
-  offset = offset >>> 0
-  if (!noAssert) checkOffset(offset, 8, this.length)
-  return ieee754.read(this, offset, false, 52, 8)
-}
-
-function checkInt (buf, value, offset, ext, max, min) {
-  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
-  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
-  if (offset + ext > buf.length) throw new RangeError('Index out of range')
-}
-
-Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    var maxBytes = Math.pow(2, 8 * byteLength) - 1
-    checkInt(this, value, offset, byteLength, maxBytes, 0)
-  }
-
-  var mul = 1
-  var i = 0
-  this[offset] = value & 0xFF
-  while (++i < byteLength && (mul *= 0x100)) {
-    this[offset + i] = (value / mul) & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  byteLength = byteLength >>> 0
-  if (!noAssert) {
-    var maxBytes = Math.pow(2, 8 * byteLength) - 1
-    checkInt(this, value, offset, byteLength, maxBytes, 0)
-  }
-
-  var i = byteLength - 1
-  var mul = 1
-  this[offset + i] = value & 0xFF
-  while (--i >= 0 && (mul *= 0x100)) {
-    this[offset + i] = (value / mul) & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
-  this[offset] = (value & 0xff)
-  return offset + 1
-}
-
-Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  return offset + 2
-}
-
-Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
-  this[offset] = (value >>> 8)
-  this[offset + 1] = (value & 0xff)
-  return offset + 2
-}
-
-Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  this[offset + 3] = (value >>> 24)
-  this[offset + 2] = (value >>> 16)
-  this[offset + 1] = (value >>> 8)
-  this[offset] = (value & 0xff)
-  return offset + 4
-}
-
-Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
-  this[offset] = (value >>> 24)
-  this[offset + 1] = (value >>> 16)
-  this[offset + 2] = (value >>> 8)
-  this[offset + 3] = (value & 0xff)
-  return offset + 4
-}
-
-Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    var limit = Math.pow(2, (8 * byteLength) - 1)
-
-    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-  }
-
-  var i = 0
-  var mul = 1
-  var sub = 0
-  this[offset] = value & 0xFF
-  while (++i < byteLength && (mul *= 0x100)) {
-    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
-      sub = 1
-    }
-    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    var limit = Math.pow(2, (8 * byteLength) - 1)
-
-    checkInt(this, value, offset, byteLength, limit - 1, -limit)
-  }
-
-  var i = byteLength - 1
-  var mul = 1
-  var sub = 0
-  this[offset + i] = value & 0xFF
-  while (--i >= 0 && (mul *= 0x100)) {
-    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
-      sub = 1
-    }
-    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
-  }
-
-  return offset + byteLength
-}
-
-Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
-  if (value < 0) value = 0xff + value + 1
-  this[offset] = (value & 0xff)
-  return offset + 1
-}
-
-Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  return offset + 2
-}
-
-Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
-  this[offset] = (value >>> 8)
-  this[offset + 1] = (value & 0xff)
-  return offset + 2
-}
-
-Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-  this[offset] = (value & 0xff)
-  this[offset + 1] = (value >>> 8)
-  this[offset + 2] = (value >>> 16)
-  this[offset + 3] = (value >>> 24)
-  return offset + 4
-}
-
-Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
-  if (value < 0) value = 0xffffffff + value + 1
-  this[offset] = (value >>> 24)
-  this[offset + 1] = (value >>> 16)
-  this[offset + 2] = (value >>> 8)
-  this[offset + 3] = (value & 0xff)
-  return offset + 4
-}
-
-function checkIEEE754 (buf, value, offset, ext, max, min) {
-  if (offset + ext > buf.length) throw new RangeError('Index out of range')
-  if (offset < 0) throw new RangeError('Index out of range')
-}
-
-function writeFloat (buf, value, offset, littleEndian, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
-  }
-  ieee754.write(buf, value, offset, littleEndian, 23, 4)
-  return offset + 4
-}
-
-Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
-  return writeFloat(this, value, offset, true, noAssert)
-}
-
-Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
-  return writeFloat(this, value, offset, false, noAssert)
-}
-
-function writeDouble (buf, value, offset, littleEndian, noAssert) {
-  value = +value
-  offset = offset >>> 0
-  if (!noAssert) {
-    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
-  }
-  ieee754.write(buf, value, offset, littleEndian, 52, 8)
-  return offset + 8
-}
-
-Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
-  return writeDouble(this, value, offset, true, noAssert)
-}
-
-Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
-  return writeDouble(this, value, offset, false, noAssert)
-}
-
-// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
-Buffer.prototype.copy = function copy (target, targetStart, start, end) {
-  if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
-  if (!start) start = 0
-  if (!end && end !== 0) end = this.length
-  if (targetStart >= target.length) targetStart = target.length
-  if (!targetStart) targetStart = 0
-  if (end > 0 && end < start) end = start
-
-  // Copy 0 bytes; we're done
-  if (end === start) return 0
-  if (target.length === 0 || this.length === 0) return 0
-
-  // Fatal error conditions
-  if (targetStart < 0) {
-    throw new RangeError('targetStart out of bounds')
-  }
-  if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
-  if (end < 0) throw new RangeError('sourceEnd out of bounds')
-
-  // Are we oob?
-  if (end > this.length) end = this.length
-  if (target.length - targetStart < end - start) {
-    end = target.length - targetStart + start
-  }
-
-  var len = end - start
-
-  if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
-    // Use built-in when available, missing from IE11
-    this.copyWithin(targetStart, start, end)
-  } else if (this === target && start < targetStart && targetStart < end) {
-    // descending copy from end
-    for (var i = len - 1; i >= 0; --i) {
-      target[i + targetStart] = this[i + start]
-    }
-  } else {
-    Uint8Array.prototype.set.call(
-      target,
-      this.subarray(start, end),
-      targetStart
-    )
-  }
-
-  return len
-}
-
-// Usage:
-//    buffer.fill(number[, offset[, end]])
-//    buffer.fill(buffer[, offset[, end]])
-//    buffer.fill(string[, offset[, end]][, encoding])
-Buffer.prototype.fill = function fill (val, start, end, encoding) {
-  // Handle string cases:
-  if (typeof val === 'string') {
-    if (typeof start === 'string') {
-      encoding = start
-      start = 0
-      end = this.length
-    } else if (typeof end === 'string') {
-      encoding = end
-      end = this.length
-    }
-    if (encoding !== undefined && typeof encoding !== 'string') {
-      throw new TypeError('encoding must be a string')
-    }
-    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
-      throw new TypeError('Unknown encoding: ' + encoding)
-    }
-    if (val.length === 1) {
-      var code = val.charCodeAt(0)
-      if ((encoding === 'utf8' && code < 128) ||
-          encoding === 'latin1') {
-        // Fast path: If `val` fits into a single byte, use that numeric value.
-        val = code
-      }
-    }
-  } else if (typeof val === 'number') {
-    val = val & 255
-  }
-
-  // Invalid ranges are not set to a default, so can range check early.
-  if (start < 0 || this.length < start || this.length < end) {
-    throw new RangeError('Out of range index')
-  }
-
-  if (end <= start) {
-    return this
-  }
-
-  start = start >>> 0
-  end = end === undefined ? this.length : end >>> 0
-
-  if (!val) val = 0
-
-  var i
-  if (typeof val === 'number') {
-    for (i = start; i < end; ++i) {
-      this[i] = val
-    }
-  } else {
-    var bytes = Buffer.isBuffer(val)
-      ? val
-      : Buffer.from(val, encoding)
-    var len = bytes.length
-    if (len === 0) {
-      throw new TypeError('The value "' + val +
-        '" is invalid for argument "value"')
-    }
-    for (i = 0; i < end - start; ++i) {
-      this[i + start] = bytes[i % len]
-    }
-  }
-
-  return this
-}
-
-// HELPER FUNCTIONS
-// ================
-
-var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
-
-function base64clean (str) {
-  // Node takes equal signs as end of the Base64 encoding
-  str = str.split('=')[0]
-  // Node strips out invalid characters like \n and \t from the string, base64-js does not
-  str = str.trim().replace(INVALID_BASE64_RE, '')
-  // Node converts strings with length < 2 to ''
-  if (str.length < 2) return ''
-  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
-  while (str.length % 4 !== 0) {
-    str = str + '='
-  }
-  return str
-}
-
-function toHex (n) {
-  if (n < 16) return '0' + n.toString(16)
-  return n.toString(16)
-}
-
-function utf8ToBytes (string, units) {
-  units = units || Infinity
-  var codePoint
-  var length = string.length
-  var leadSurrogate = null
-  var bytes = []
-
-  for (var i = 0; i < length; ++i) {
-    codePoint = string.charCodeAt(i)
-
-    // is surrogate component
-    if (codePoint > 0xD7FF && codePoint < 0xE000) {
-      // last char was a lead
-      if (!leadSurrogate) {
-        // no lead yet
-        if (codePoint > 0xDBFF) {
-          // unexpected trail
-          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-          continue
-        } else if (i + 1 === length) {
-          // unpaired lead
-          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-          continue
-        }
-
-        // valid lead
-        leadSurrogate = codePoint
-
-        continue
-      }
-
-      // 2 leads in a row
-      if (codePoint < 0xDC00) {
-        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-        leadSurrogate = codePoint
-        continue
-      }
-
-      // valid surrogate pair
-      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
-    } else if (leadSurrogate) {
-      // valid bmp char, but last char was a lead
-      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
-    }
-
-    leadSurrogate = null
-
-    // encode utf8
-    if (codePoint < 0x80) {
-      if ((units -= 1) < 0) break
-      bytes.push(codePoint)
-    } else if (codePoint < 0x800) {
-      if ((units -= 2) < 0) break
-      bytes.push(
-        codePoint >> 0x6 | 0xC0,
-        codePoint & 0x3F | 0x80
-      )
-    } else if (codePoint < 0x10000) {
-      if ((units -= 3) < 0) break
-      bytes.push(
-        codePoint >> 0xC | 0xE0,
-        codePoint >> 0x6 & 0x3F | 0x80,
-        codePoint & 0x3F | 0x80
-      )
-    } else if (codePoint < 0x110000) {
-      if ((units -= 4) < 0) break
-      bytes.push(
-        codePoint >> 0x12 | 0xF0,
-        codePoint >> 0xC & 0x3F | 0x80,
-        codePoint >> 0x6 & 0x3F | 0x80,
-        codePoint & 0x3F | 0x80
-      )
-    } else {
-      throw new Error('Invalid code point')
-    }
-  }
-
-  return bytes
-}
-
-function asciiToBytes (str) {
-  var byteArray = []
-  for (var i = 0; i < str.length; ++i) {
-    // Node's code seems to be doing this and not & 0x7F..
-    byteArray.push(str.charCodeAt(i) & 0xFF)
-  }
-  return byteArray
-}
-
-function utf16leToBytes (str, units) {
-  var c, hi, lo
-  var byteArray = []
-  for (var i = 0; i < str.length; ++i) {
-    if ((units -= 2) < 0) break
-
-    c = str.charCodeAt(i)
-    hi = c >> 8
-    lo = c % 256
-    byteArray.push(lo)
-    byteArray.push(hi)
-  }
-
-  return byteArray
-}
-
-function base64ToBytes (str) {
-  return base64.toByteArray(base64clean(str))
-}
-
-function blitBuffer (src, dst, offset, length) {
-  for (var i = 0; i < length; ++i) {
-    if ((i + offset >= dst.length) || (i >= src.length)) break
-    dst[i + offset] = src[i]
-  }
-  return i
-}
-
-// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
-// the `instanceof` check but they should be treated as of that type.
-// See: https://github.com/feross/buffer/issues/166
-function isInstance (obj, type) {
-  return obj instanceof type ||
-    (obj != null && obj.constructor != null && obj.constructor.name != null &&
-      obj.constructor.name === type.name)
-}
-function numberIsNaN (obj) {
-  // For IE11 support
-  return obj !== obj // eslint-disable-line no-self-compare
-}
-
-}).call(this,require("buffer").Buffer)
-},{"base64-js":2,"buffer":4,"ieee754":7}],5:[function(require,module,exports){
-(function (Buffer){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-
-function isArray(arg) {
-  if (Array.isArray) {
-    return Array.isArray(arg);
-  }
-  return objectToString(arg) === '[object Array]';
-}
-exports.isArray = isArray;
-
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
-
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
-
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
-
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-exports.isNumber = isNumber;
-
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
-
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
-
-function isUndefined(arg) {
-  return arg === void 0;
-}
-exports.isUndefined = isUndefined;
-
-function isRegExp(re) {
-  return objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
-
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
-
-function isDate(d) {
-  return objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
-
-function isError(e) {
-  return (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
-
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
-
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
-}
-exports.isPrimitive = isPrimitive;
-
-exports.isBuffer = Buffer.isBuffer;
-
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
-
-}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
-},{"../../is-buffer/index.js":9}],6:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var objectCreate = Object.create || objectCreatePolyfill
-var objectKeys = Object.keys || objectKeysPolyfill
-var bind = Function.prototype.bind || functionBindPolyfill
-
-function EventEmitter() {
-  if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
-    this._events = objectCreate(null);
-    this._eventsCount = 0;
-  }
-
-  this._maxListeners = this._maxListeners || undefined;
-}
-module.exports = EventEmitter;
-
-// Backwards-compat with node 0.10.x
-EventEmitter.EventEmitter = EventEmitter;
-
-EventEmitter.prototype._events = undefined;
-EventEmitter.prototype._maxListeners = undefined;
-
-// By default EventEmitters will print a warning if more than 10 listeners are
-// added to it. This is a useful default which helps finding memory leaks.
-var defaultMaxListeners = 10;
-
-var hasDefineProperty;
-try {
-  var o = {};
-  if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
-  hasDefineProperty = o.x === 0;
-} catch (err) { hasDefineProperty = false }
-if (hasDefineProperty) {
-  Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
-    enumerable: true,
-    get: function() {
-      return defaultMaxListeners;
-    },
-    set: function(arg) {
-      // check whether the input is a positive number (whose value is zero or
-      // greater and not a NaN).
-      if (typeof arg !== 'number' || arg < 0 || arg !== arg)
-        throw new TypeError('"defaultMaxListeners" must be a positive number');
-      defaultMaxListeners = arg;
-    }
-  });
-} else {
-  EventEmitter.defaultMaxListeners = defaultMaxListeners;
-}
-
-// Obviously not all Emitters should be limited to 10. This function allows
-// that to be increased. Set to zero for unlimited.
-EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
-  if (typeof n !== 'number' || n < 0 || isNaN(n))
-    throw new TypeError('"n" argument must be a positive number');
-  this._maxListeners = n;
-  return this;
-};
-
-function $getMaxListeners(that) {
-  if (that._maxListeners === undefined)
-    return EventEmitter.defaultMaxListeners;
-  return that._maxListeners;
-}
-
-EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
-  return $getMaxListeners(this);
-};
-
-// These standalone emit* functions are used to optimize calling of event
-// handlers for fast cases because emit() itself often has a variable number of
-// arguments and can be deoptimized because of that. These functions always have
-// the same number of arguments and thus do not get deoptimized, so the code
-// inside them can execute faster.
-function emitNone(handler, isFn, self) {
-  if (isFn)
-    handler.call(self);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self);
-  }
-}
-function emitOne(handler, isFn, self, arg1) {
-  if (isFn)
-    handler.call(self, arg1);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1);
-  }
-}
-function emitTwo(handler, isFn, self, arg1, arg2) {
-  if (isFn)
-    handler.call(self, arg1, arg2);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1, arg2);
-  }
-}
-function emitThree(handler, isFn, self, arg1, arg2, arg3) {
-  if (isFn)
-    handler.call(self, arg1, arg2, arg3);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].call(self, arg1, arg2, arg3);
-  }
-}
-
-function emitMany(handler, isFn, self, args) {
-  if (isFn)
-    handler.apply(self, args);
-  else {
-    var len = handler.length;
-    var listeners = arrayClone(handler, len);
-    for (var i = 0; i < len; ++i)
-      listeners[i].apply(self, args);
-  }
-}
-
-EventEmitter.prototype.emit = function emit(type) {
-  var er, handler, len, args, i, events;
-  var doError = (type === 'error');
-
-  events = this._events;
-  if (events)
-    doError = (doError && events.error == null);
-  else if (!doError)
-    return false;
-
-  // If there is no 'error' event listener then throw.
-  if (doError) {
-    if (arguments.length > 1)
-      er = arguments[1];
-    if (er instanceof Error) {
-      throw er; // Unhandled 'error' event
-    } else {
-      // At least give some kind of context to the user
-      var err = new Error('Unhandled "error" event. (' + er + ')');
-      err.context = er;
-      throw err;
-    }
-    return false;
-  }
-
-  handler = events[type];
-
-  if (!handler)
-    return false;
-
-  var isFn = typeof handler === 'function';
-  len = arguments.length;
-  switch (len) {
-      // fast cases
-    case 1:
-      emitNone(handler, isFn, this);
-      break;
-    case 2:
-      emitOne(handler, isFn, this, arguments[1]);
-      break;
-    case 3:
-      emitTwo(handler, isFn, this, arguments[1], arguments[2]);
-      break;
-    case 4:
-      emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
-      break;
-      // slower
-    default:
-      args = new Array(len - 1);
-      for (i = 1; i < len; i++)
-        args[i - 1] = arguments[i];
-      emitMany(handler, isFn, this, args);
-  }
-
-  return true;
-};
-
-function _addListener(target, type, listener, prepend) {
-  var m;
-  var events;
-  var existing;
-
-  if (typeof listener !== 'function')
-    throw new TypeError('"listener" argument must be a function');
-
-  events = target._events;
-  if (!events) {
-    events = target._events = objectCreate(null);
-    target._eventsCount = 0;
-  } else {
-    // To avoid recursion in the case that type === "newListener"! Before
-    // adding it to the listeners, first emit "newListener".
-    if (events.newListener) {
-      target.emit('newListener', type,
-          listener.listener ? listener.listener : listener);
-
-      // Re-assign `events` because a newListener handler could have caused the
-      // this._events to be assigned to a new object
-      events = target._events;
-    }
-    existing = events[type];
-  }
-
-  if (!existing) {
-    // Optimize the case of one listener. Don't need the extra array object.
-    existing = events[type] = listener;
-    ++target._eventsCount;
-  } else {
-    if (typeof existing === 'function') {
-      // Adding the second element, need to change to array.
-      existing = events[type] =
-          prepend ? [listener, existing] : [existing, listener];
-    } else {
-      // If we've already got an array, just append.
-      if (prepend) {
-        existing.unshift(listener);
-      } else {
-        existing.push(listener);
-      }
-    }
-
-    // Check for listener leak
-    if (!existing.warned) {
-      m = $getMaxListeners(target);
-      if (m && m > 0 && existing.length > m) {
-        existing.warned = true;
-        var w = new Error('Possible EventEmitter memory leak detected. ' +
-            existing.length + ' "' + String(type) + '" listeners ' +
-            'added. Use emitter.setMaxListeners() to ' +
-            'increase limit.');
-        w.name = 'MaxListenersExceededWarning';
-        w.emitter = target;
-        w.type = type;
-        w.count = existing.length;
-        if (typeof console === 'object' && console.warn) {
-          console.warn('%s: %s', w.name, w.message);
-        }
-      }
-    }
-  }
-
-  return target;
-}
-
-EventEmitter.prototype.addListener = function addListener(type, listener) {
-  return _addListener(this, type, listener, false);
-};
-
-EventEmitter.prototype.on = EventEmitter.prototype.addListener;
-
-EventEmitter.prototype.prependListener =
-    function prependListener(type, listener) {
-      return _addListener(this, type, listener, true);
-    };
-
-function onceWrapper() {
-  if (!this.fired) {
-    this.target.removeListener(this.type, this.wrapFn);
-    this.fired = true;
-    switch (arguments.length) {
-      case 0:
-        return this.listener.call(this.target);
-      case 1:
-        return this.listener.call(this.target, arguments[0]);
-      case 2:
-        return this.listener.call(this.target, arguments[0], arguments[1]);
-      case 3:
-        return this.listener.call(this.target, arguments[0], arguments[1],
-            arguments[2]);
-      default:
-        var args = new Array(arguments.length);
-        for (var i = 0; i < args.length; ++i)
-          args[i] = arguments[i];
-        this.listener.apply(this.target, args);
-    }
-  }
-}
-
-function _onceWrap(target, type, listener) {
-  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
-  var wrapped = bind.call(onceWrapper, state);
-  wrapped.listener = listener;
-  state.wrapFn = wrapped;
-  return wrapped;
-}
-
-EventEmitter.prototype.once = function once(type, listener) {
-  if (typeof listener !== 'function')
-    throw new TypeError('"listener" argument must be a function');
-  this.on(type, _onceWrap(this, type, listener));
-  return this;
-};
-
-EventEmitter.prototype.prependOnceListener =
-    function prependOnceListener(type, listener) {
-      if (typeof listener !== 'function')
-        throw new TypeError('"listener" argument must be a function');
-      this.prependListener(type, _onceWrap(this, type, listener));
-      return this;
-    };
-
-// Emits a 'removeListener' event if and only if the listener was removed.
-EventEmitter.prototype.removeListener =
-    function removeListener(type, listener) {
-      var list, events, position, i, originalListener;
-
-      if (typeof listener !== 'function')
-        throw new TypeError('"listener" argument must be a function');
-
-      events = this._events;
-      if (!events)
-        return this;
-
-      list = events[type];
-      if (!list)
-        return this;
-
-      if (list === listener || list.listener === listener) {
-        if (--this._eventsCount === 0)
-          this._events = objectCreate(null);
-        else {
-          delete events[type];
-          if (events.removeListener)
-            this.emit('removeListener', type, list.listener || listener);
-        }
-      } else if (typeof list !== 'function') {
-        position = -1;
-
-        for (i = list.length - 1; i >= 0; i--) {
-          if (list[i] === listener || list[i].listener === listener) {
-            originalListener = list[i].listener;
-            position = i;
-            break;
-          }
-        }
-
-        if (position < 0)
-          return this;
-
-        if (position === 0)
-          list.shift();
-        else
-          spliceOne(list, position);
-
-        if (list.length === 1)
-          events[type] = list[0];
-
-        if (events.removeListener)
-          this.emit('removeListener', type, originalListener || listener);
-      }
-
-      return this;
-    };
-
-EventEmitter.prototype.removeAllListeners =
-    function removeAllListeners(type) {
-      var listeners, events, i;
-
-      events = this._events;
-      if (!events)
-        return this;
-
-      // not listening for removeListener, no need to emit
-      if (!events.removeListener) {
-        if (arguments.length === 0) {
-          this._events = objectCreate(null);
-          this._eventsCount = 0;
-        } else if (events[type]) {
-          if (--this._eventsCount === 0)
-            this._events = objectCreate(null);
-          else
-            delete events[type];
-        }
-        return this;
-      }
-
-      // emit removeListener for all listeners on all events
-      if (arguments.length === 0) {
-        var keys = objectKeys(events);
-        var key;
-        for (i = 0; i < keys.length; ++i) {
-          key = keys[i];
-          if (key === 'removeListener') continue;
-          this.removeAllListeners(key);
-        }
-        this.removeAllListeners('removeListener');
-        this._events = objectCreate(null);
-        this._eventsCount = 0;
-        return this;
-      }
-
-      listeners = events[type];
-
-      if (typeof listeners === 'function') {
-        this.removeListener(type, listeners);
-      } else if (listeners) {
-        // LIFO order
-        for (i = listeners.length - 1; i >= 0; i--) {
-          this.removeListener(type, listeners[i]);
-        }
-      }
-
-      return this;
-    };
-
-function _listeners(target, type, unwrap) {
-  var events = target._events;
-
-  if (!events)
-    return [];
-
-  var evlistener = events[type];
-  if (!evlistener)
-    return [];
-
-  if (typeof evlistener === 'function')
-    return unwrap ? [evlistener.listener || evlistener] : [evlistener];
-
-  return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
-}
-
-EventEmitter.prototype.listeners = function listeners(type) {
-  return _listeners(this, type, true);
-};
-
-EventEmitter.prototype.rawListeners = function rawListeners(type) {
-  return _listeners(this, type, false);
-};
-
-EventEmitter.listenerCount = function(emitter, type) {
-  if (typeof emitter.listenerCount === 'function') {
-    return emitter.listenerCount(type);
-  } else {
-    return listenerCount.call(emitter, type);
-  }
-};
-
-EventEmitter.prototype.listenerCount = listenerCount;
-function listenerCount(type) {
-  var events = this._events;
-
-  if (events) {
-    var evlistener = events[type];
-
-    if (typeof evlistener === 'function') {
-      return 1;
-    } else if (evlistener) {
-      return evlistener.length;
-    }
-  }
-
-  return 0;
-}
-
-EventEmitter.prototype.eventNames = function eventNames() {
-  return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
-};
-
-// About 1.5x faster than the two-arg version of Array#splice().
-function spliceOne(list, index) {
-  for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
-    list[i] = list[k];
-  list.pop();
-}
-
-function arrayClone(arr, n) {
-  var copy = new Array(n);
-  for (var i = 0; i < n; ++i)
-    copy[i] = arr[i];
-  return copy;
-}
-
-function unwrapListeners(arr) {
-  var ret = new Array(arr.length);
-  for (var i = 0; i < ret.length; ++i) {
-    ret[i] = arr[i].listener || arr[i];
-  }
-  return ret;
-}
-
-function objectCreatePolyfill(proto) {
-  var F = function() {};
-  F.prototype = proto;
-  return new F;
-}
-function objectKeysPolyfill(obj) {
-  var keys = [];
-  for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) {
-    keys.push(k);
-  }
-  return k;
-}
-function functionBindPolyfill(context) {
-  var fn = this;
-  return function () {
-    return fn.apply(context, arguments);
-  };
-}
-
-},{}],7:[function(require,module,exports){
-exports.read = function (buffer, offset, isLE, mLen, nBytes) {
-  var e, m
-  var eLen = (nBytes * 8) - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var nBits = -7
-  var i = isLE ? (nBytes - 1) : 0
-  var d = isLE ? -1 : 1
-  var s = buffer[offset + i]
-
-  i += d
-
-  e = s & ((1 << (-nBits)) - 1)
-  s >>= (-nBits)
-  nBits += eLen
-  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
-
-  m = e & ((1 << (-nBits)) - 1)
-  e >>= (-nBits)
-  nBits += mLen
-  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
-
-  if (e === 0) {
-    e = 1 - eBias
-  } else if (e === eMax) {
-    return m ? NaN : ((s ? -1 : 1) * Infinity)
-  } else {
-    m = m + Math.pow(2, mLen)
-    e = e - eBias
-  }
-  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-}
-
-exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
-  var e, m, c
-  var eLen = (nBytes * 8) - mLen - 1
-  var eMax = (1 << eLen) - 1
-  var eBias = eMax >> 1
-  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
-  var i = isLE ? 0 : (nBytes - 1)
-  var d = isLE ? 1 : -1
-  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
-
-  value = Math.abs(value)
-
-  if (isNaN(value) || value === Infinity) {
-    m = isNaN(value) ? 1 : 0
-    e = eMax
-  } else {
-    e = Math.floor(Math.log(value) / Math.LN2)
-    if (value * (c = Math.pow(2, -e)) < 1) {
-      e--
-      c *= 2
-    }
-    if (e + eBias >= 1) {
-      value += rt / c
-    } else {
-      value += rt * Math.pow(2, 1 - eBias)
-    }
-    if (value * c >= 2) {
-      e++
-      c /= 2
-    }
-
-    if (e + eBias >= eMax) {
-      m = 0
-      e = eMax
-    } else if (e + eBias >= 1) {
-      m = ((value * c) - 1) * Math.pow(2, mLen)
-      e = e + eBias
-    } else {
-      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
-      e = 0
-    }
-  }
-
-  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
-
-  e = (e << mLen) | m
-  eLen += mLen
-  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
-
-  buffer[offset + i - d] |= s * 128
-}
-
-},{}],8:[function(require,module,exports){
-if (typeof Object.create === 'function') {
-  // implementation from standard node.js 'util' module
-  module.exports = function inherits(ctor, superCtor) {
-    if (superCtor) {
-      ctor.super_ = superCtor
-      ctor.prototype = Object.create(superCtor.prototype, {
-        constructor: {
-          value: ctor,
-          enumerable: false,
-          writable: true,
-          configurable: true
-        }
-      })
-    }
-  };
-} else {
-  // old school shim for old browsers
-  module.exports = function inherits(ctor, superCtor) {
-    if (superCtor) {
-      ctor.super_ = superCtor
-      var TempCtor = function () {}
-      TempCtor.prototype = superCtor.prototype
-      ctor.prototype = new TempCtor()
-      ctor.prototype.constructor = ctor
-    }
-  }
-}
-
-},{}],9:[function(require,module,exports){
-/*!
- * Determine if an object is a Buffer
- *
- * @author   Feross Aboukhadijeh <https://feross.org>
- * @license  MIT
- */
-
-// The _isBuffer check is for Safari 5-7 support, because it's missing
-// Object.prototype.constructor. Remove this eventually
-module.exports = function (obj) {
-  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
-}
-
-function isBuffer (obj) {
-  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
-}
-
-// For Node v0.10 support. Remove this eventually.
-function isSlowBuffer (obj) {
-  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
-}
-
-},{}],10:[function(require,module,exports){
-var toString = {}.toString;
-
-module.exports = Array.isArray || function (arr) {
-  return toString.call(arr) == '[object Array]';
-};
-
-},{}],11:[function(require,module,exports){
-(function (process){
-'use strict';
-
-if (typeof process === 'undefined' ||
-    !process.version ||
-    process.version.indexOf('v0.') === 0 ||
-    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
-  module.exports = { nextTick: nextTick };
-} else {
-  module.exports = process
-}
-
-function nextTick(fn, arg1, arg2, arg3) {
-  if (typeof fn !== 'function') {
-    throw new TypeError('"callback" argument must be a function');
-  }
-  var len = arguments.length;
-  var args, i;
-  switch (len) {
-  case 0:
-  case 1:
-    return process.nextTick(fn);
-  case 2:
-    return process.nextTick(function afterTickOne() {
-      fn.call(null, arg1);
-    });
-  case 3:
-    return process.nextTick(function afterTickTwo() {
-      fn.call(null, arg1, arg2);
-    });
-  case 4:
-    return process.nextTick(function afterTickThree() {
-      fn.call(null, arg1, arg2, arg3);
-    });
-  default:
-    args = new Array(len - 1);
-    i = 0;
-    while (i < args.length) {
-      args[i++] = arguments[i];
-    }
-    return process.nextTick(function afterTick() {
-      fn.apply(null, args);
-    });
-  }
-}
-
-
-}).call(this,require('_process'))
-},{"_process":12}],12:[function(require,module,exports){
-// shim for using process in browser
-var process = module.exports = {};
-
-// cached from whatever global is present so that test runners that stub it
-// don't break things.  But we need to wrap it in a try catch in case it is
-// wrapped in strict mode code which doesn't define any globals.  It's inside a
-// function because try/catches deoptimize in certain engines.
-
-var cachedSetTimeout;
-var cachedClearTimeout;
-
-function defaultSetTimout() {
-    throw new Error('setTimeout has not been defined');
-}
-function defaultClearTimeout () {
-    throw new Error('clearTimeout has not been defined');
-}
-(function () {
-    try {
-        if (typeof setTimeout === 'function') {
-            cachedSetTimeout = setTimeout;
-        } else {
-            cachedSetTimeout = defaultSetTimout;
-        }
-    } catch (e) {
-        cachedSetTimeout = defaultSetTimout;
-    }
-    try {
-        if (typeof clearTimeout === 'function') {
-            cachedClearTimeout = clearTimeout;
-        } else {
-            cachedClearTimeout = defaultClearTimeout;
-        }
-    } catch (e) {
-        cachedClearTimeout = defaultClearTimeout;
-    }
-} ())
-function runTimeout(fun) {
-    if (cachedSetTimeout === setTimeout) {
-        //normal enviroments in sane situations
-        return setTimeout(fun, 0);
-    }
-    // if setTimeout wasn't available but was latter defined
-    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
-        cachedSetTimeout = setTimeout;
-        return setTimeout(fun, 0);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedSetTimeout(fun, 0);
-    } catch(e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
-            return cachedSetTimeout.call(null, fun, 0);
-        } catch(e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
-            return cachedSetTimeout.call(this, fun, 0);
-        }
-    }
-
-
-}
-function runClearTimeout(marker) {
-    if (cachedClearTimeout === clearTimeout) {
-        //normal enviroments in sane situations
-        return clearTimeout(marker);
-    }
-    // if clearTimeout wasn't available but was latter defined
-    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
-        cachedClearTimeout = clearTimeout;
-        return clearTimeout(marker);
-    }
-    try {
-        // when when somebody has screwed with setTimeout but no I.E. maddness
-        return cachedClearTimeout(marker);
-    } catch (e){
-        try {
-            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
-            return cachedClearTimeout.call(null, marker);
-        } catch (e){
-            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
-            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
-            return cachedClearTimeout.call(this, marker);
-        }
-    }
-
-
-
-}
-var queue = [];
-var draining = false;
-var currentQueue;
-var queueIndex = -1;
-
-function cleanUpNextTick() {
-    if (!draining || !currentQueue) {
-        return;
-    }
-    draining = false;
-    if (currentQueue.length) {
-        queue = currentQueue.concat(queue);
-    } else {
-        queueIndex = -1;
-    }
-    if (queue.length) {
-        drainQueue();
-    }
-}
-
-function drainQueue() {
-    if (draining) {
-        return;
-    }
-    var timeout = runTimeout(cleanUpNextTick);
-    draining = true;
-
-    var len = queue.length;
-    while(len) {
-        currentQueue = queue;
-        queue = [];
-        while (++queueIndex < len) {
-            if (currentQueue) {
-                currentQueue[queueIndex].run();
-            }
-        }
-        queueIndex = -1;
-        len = queue.length;
-    }
-    currentQueue = null;
-    draining = false;
-    runClearTimeout(timeout);
-}
-
-process.nextTick = function (fun) {
-    var args = new Array(arguments.length - 1);
-    if (arguments.length > 1) {
-        for (var i = 1; i < arguments.length; i++) {
-            args[i - 1] = arguments[i];
-        }
-    }
-    queue.push(new Item(fun, args));
-    if (queue.length === 1 && !draining) {
-        runTimeout(drainQueue);
-    }
-};
-
-// v8 likes predictible objects
-function Item(fun, array) {
-    this.fun = fun;
-    this.array = array;
-}
-Item.prototype.run = function () {
-    this.fun.apply(null, this.array);
-};
-process.title = 'browser';
-process.browser = true;
-process.env = {};
-process.argv = [];
-process.version = ''; // empty string to avoid regexp issues
-process.versions = {};
-
-function noop() {}
-
-process.on = noop;
-process.addListener = noop;
-process.once = noop;
-process.off = noop;
-process.removeListener = noop;
-process.removeAllListeners = noop;
-process.emit = noop;
-process.prependListener = noop;
-process.prependOnceListener = noop;
-
-process.listeners = function (name) { return [] }
-
-process.binding = function (name) {
-    throw new Error('process.binding is not supported');
-};
-
-process.cwd = function () { return '/' };
-process.chdir = function (dir) {
-    throw new Error('process.chdir is not supported');
-};
-process.umask = function() { return 0; };
-
-},{}],13:[function(require,module,exports){
-module.exports = require('./lib/_stream_duplex.js');
-
-},{"./lib/_stream_duplex.js":14}],14:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a duplex stream is just a stream that is both readable and writable.
-// Since JS doesn't have multiple prototypal inheritance, this class
-// prototypally inherits from Readable, and then parasitically from
-// Writable.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-/*<replacement>*/
-var objectKeys = Object.keys || function (obj) {
-  var keys = [];
-  for (var key in obj) {
-    keys.push(key);
-  }return keys;
-};
-/*</replacement>*/
-
-module.exports = Duplex;
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-var Readable = require('./_stream_readable');
-var Writable = require('./_stream_writable');
-
-util.inherits(Duplex, Readable);
-
-{
-  // avoid scope creep, the keys array can then be collected
-  var keys = objectKeys(Writable.prototype);
-  for (var v = 0; v < keys.length; v++) {
-    var method = keys[v];
-    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
-  }
-}
-
-function Duplex(options) {
-  if (!(this instanceof Duplex)) return new Duplex(options);
-
-  Readable.call(this, options);
-  Writable.call(this, options);
-
-  if (options && options.readable === false) this.readable = false;
-
-  if (options && options.writable === false) this.writable = false;
-
-  this.allowHalfOpen = true;
-  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
-
-  this.once('end', onend);
-}
-
-Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._writableState.highWaterMark;
-  }
-});
-
-// the no-half-open enforcer
-function onend() {
-  // if we allow half-open state, or if the writable side ended,
-  // then we're ok.
-  if (this.allowHalfOpen || this._writableState.ended) return;
-
-  // no more data can be written.
-  // But allow more writes to happen in this tick.
-  pna.nextTick(onEndNT, this);
-}
-
-function onEndNT(self) {
-  self.end();
-}
-
-Object.defineProperty(Duplex.prototype, 'destroyed', {
-  get: function () {
-    if (this._readableState === undefined || this._writableState === undefined) {
-      return false;
-    }
-    return this._readableState.destroyed && this._writableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (this._readableState === undefined || this._writableState === undefined) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._readableState.destroyed = value;
-    this._writableState.destroyed = value;
-  }
-});
-
-Duplex.prototype._destroy = function (err, cb) {
-  this.push(null);
-  this.end();
-
-  pna.nextTick(cb, err);
-};
-},{"./_stream_readable":16,"./_stream_writable":18,"core-util-is":5,"inherits":8,"process-nextick-args":11}],15:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a passthrough stream.
-// basically just the most minimal sort of Transform stream.
-// Every written chunk gets output as-is.
-
-'use strict';
-
-module.exports = PassThrough;
-
-var Transform = require('./_stream_transform');
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(PassThrough, Transform);
-
-function PassThrough(options) {
-  if (!(this instanceof PassThrough)) return new PassThrough(options);
-
-  Transform.call(this, options);
-}
-
-PassThrough.prototype._transform = function (chunk, encoding, cb) {
-  cb(null, chunk);
-};
-},{"./_stream_transform":17,"core-util-is":5,"inherits":8}],16:[function(require,module,exports){
-(function (process,global){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-module.exports = Readable;
-
-/*<replacement>*/
-var isArray = require('isarray');
-/*</replacement>*/
-
-/*<replacement>*/
-var Duplex;
-/*</replacement>*/
-
-Readable.ReadableState = ReadableState;
-
-/*<replacement>*/
-var EE = require('events').EventEmitter;
-
-var EElistenerCount = function (emitter, type) {
-  return emitter.listeners(type).length;
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream = require('./internal/streams/stream');
-/*</replacement>*/
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-var OurUint8Array = global.Uint8Array || function () {};
-function _uint8ArrayToBuffer(chunk) {
-  return Buffer.from(chunk);
-}
-function _isUint8Array(obj) {
-  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
-}
-
-/*</replacement>*/
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var debugUtil = require('util');
-var debug = void 0;
-if (debugUtil && debugUtil.debuglog) {
-  debug = debugUtil.debuglog('stream');
-} else {
-  debug = function () {};
-}
-/*</replacement>*/
-
-var BufferList = require('./internal/streams/BufferList');
-var destroyImpl = require('./internal/streams/destroy');
-var StringDecoder;
-
-util.inherits(Readable, Stream);
-
-var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
-
-function prependListener(emitter, event, fn) {
-  // Sadly this is not cacheable as some libraries bundle their own
-  // event emitter implementation with them.
-  if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);
-
-  // This is a hack to make sure that our error handler is attached before any
-  // userland ones.  NEVER DO THIS. This is here only because this code needs
-  // to continue to work with older versions of Node.js that do not include
-  // the prependListener() method. The goal is to eventually remove this hack.
-  if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
-}
-
-function ReadableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // Duplex streams are both readable and writable, but share
-  // the same options object.
-  // However, some cases require setting options to different
-  // values for the readable and the writable sides of the duplex stream.
-  // These options can be provided separately as readableXXX and writableXXX.
-  var isDuplex = stream instanceof Duplex;
-
-  // object stream flag. Used to make read(n) ignore n and to
-  // make all the buffer merging and length checks go away
-  this.objectMode = !!options.objectMode;
-
-  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
-
-  // the point at which it stops calling _read() to fill the buffer
-  // Note: 0 is a valid value, means "don't call _read preemptively ever"
-  var hwm = options.highWaterMark;
-  var readableHwm = options.readableHighWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-
-  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = Math.floor(this.highWaterMark);
-
-  // A linked list is used to store data chunks instead of an array because the
-  // linked list can remove elements from the beginning faster than
-  // array.shift()
-  this.buffer = new BufferList();
-  this.length = 0;
-  this.pipes = null;
-  this.pipesCount = 0;
-  this.flowing = null;
-  this.ended = false;
-  this.endEmitted = false;
-  this.reading = false;
-
-  // a flag to be able to tell if the event 'readable'/'data' is emitted
-  // immediately, or on a later tick.  We set this to true at first, because
-  // any actions that shouldn't happen until "later" should generally also
-  // not happen before the first read call.
-  this.sync = true;
-
-  // whenever we return null, then we set a flag to say
-  // that we're awaiting a 'readable' event emission.
-  this.needReadable = false;
-  this.emittedReadable = false;
-  this.readableListening = false;
-  this.resumeScheduled = false;
-
-  // has it been destroyed
-  this.destroyed = false;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // the number of writers that are awaiting a drain event in .pipe()s
-  this.awaitDrain = 0;
-
-  // if true, a maybeReadMore has been scheduled
-  this.readingMore = false;
-
-  this.decoder = null;
-  this.encoding = null;
-  if (options.encoding) {
-    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-    this.decoder = new StringDecoder(options.encoding);
-    this.encoding = options.encoding;
-  }
-}
-
-function Readable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  if (!(this instanceof Readable)) return new Readable(options);
-
-  this._readableState = new ReadableState(options, this);
-
-  // legacy
-  this.readable = true;
-
-  if (options) {
-    if (typeof options.read === 'function') this._read = options.read;
-
-    if (typeof options.destroy === 'function') this._destroy = options.destroy;
-  }
-
-  Stream.call(this);
-}
-
-Object.defineProperty(Readable.prototype, 'destroyed', {
-  get: function () {
-    if (this._readableState === undefined) {
-      return false;
-    }
-    return this._readableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (!this._readableState) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._readableState.destroyed = value;
-  }
-});
-
-Readable.prototype.destroy = destroyImpl.destroy;
-Readable.prototype._undestroy = destroyImpl.undestroy;
-Readable.prototype._destroy = function (err, cb) {
-  this.push(null);
-  cb(err);
-};
-
-// Manually shove something into the read() buffer.
-// This returns true if the highWaterMark has not been hit yet,
-// similar to how Writable.write() returns true if you should
-// write() some more.
-Readable.prototype.push = function (chunk, encoding) {
-  var state = this._readableState;
-  var skipChunkCheck;
-
-  if (!state.objectMode) {
-    if (typeof chunk === 'string') {
-      encoding = encoding || state.defaultEncoding;
-      if (encoding !== state.encoding) {
-        chunk = Buffer.from(chunk, encoding);
-        encoding = '';
-      }
-      skipChunkCheck = true;
-    }
-  } else {
-    skipChunkCheck = true;
-  }
-
-  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
-};
-
-// Unshift should *always* be something directly out of read()
-Readable.prototype.unshift = function (chunk) {
-  return readableAddChunk(this, chunk, null, true, false);
-};
-
-function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
-  var state = stream._readableState;
-  if (chunk === null) {
-    state.reading = false;
-    onEofChunk(stream, state);
-  } else {
-    var er;
-    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
-    if (er) {
-      stream.emit('error', er);
-    } else if (state.objectMode || chunk && chunk.length > 0) {
-      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
-        chunk = _uint8ArrayToBuffer(chunk);
-      }
-
-      if (addToFront) {
-        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
-      } else if (state.ended) {
-        stream.emit('error', new Error('stream.push() after EOF'));
-      } else {
-        state.reading = false;
-        if (state.decoder && !encoding) {
-          chunk = state.decoder.write(chunk);
-          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
-        } else {
-          addChunk(stream, state, chunk, false);
-        }
-      }
-    } else if (!addToFront) {
-      state.reading = false;
-    }
-  }
-
-  return needMoreData(state);
-}
-
-function addChunk(stream, state, chunk, addToFront) {
-  if (state.flowing && state.length === 0 && !state.sync) {
-    stream.emit('data', chunk);
-    stream.read(0);
-  } else {
-    // update the buffer info.
-    state.length += state.objectMode ? 1 : chunk.length;
-    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
-
-    if (state.needReadable) emitReadable(stream);
-  }
-  maybeReadMore(stream, state);
-}
-
-function chunkInvalid(state, chunk) {
-  var er;
-  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  return er;
-}
-
-// if it's past the high water mark, we can push in some more.
-// Also, if we have no data yet, we can stand some
-// more bytes.  This is to work around cases where hwm=0,
-// such as the repl.  Also, if the push() triggered a
-// readable event, and the user called read(largeNumber) such that
-// needReadable was set, then we ought to push more, so that another
-// 'readable' event will be triggered.
-function needMoreData(state) {
-  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
-}
-
-Readable.prototype.isPaused = function () {
-  return this._readableState.flowing === false;
-};
-
-// backwards compatibility.
-Readable.prototype.setEncoding = function (enc) {
-  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
-  this._readableState.decoder = new StringDecoder(enc);
-  this._readableState.encoding = enc;
-  return this;
-};
-
-// Don't raise the hwm > 8MB
-var MAX_HWM = 0x800000;
-function computeNewHighWaterMark(n) {
-  if (n >= MAX_HWM) {
-    n = MAX_HWM;
-  } else {
-    // Get the next highest power of 2 to prevent increasing hwm excessively in
-    // tiny amounts
-    n--;
-    n |= n >>> 1;
-    n |= n >>> 2;
-    n |= n >>> 4;
-    n |= n >>> 8;
-    n |= n >>> 16;
-    n++;
-  }
-  return n;
-}
-
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function howMuchToRead(n, state) {
-  if (n <= 0 || state.length === 0 && state.ended) return 0;
-  if (state.objectMode) return 1;
-  if (n !== n) {
-    // Only flow one buffer at a time
-    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
-  }
-  // If we're asking for more than the current hwm, then raise the hwm.
-  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
-  if (n <= state.length) return n;
-  // Don't have enough
-  if (!state.ended) {
-    state.needReadable = true;
-    return 0;
-  }
-  return state.length;
-}
-
-// you can override either this method, or the async _read(n) below.
-Readable.prototype.read = function (n) {
-  debug('read', n);
-  n = parseInt(n, 10);
-  var state = this._readableState;
-  var nOrig = n;
-
-  if (n !== 0) state.emittedReadable = false;
-
-  // if we're doing read(0) to trigger a readable event, but we
-  // already have a bunch of data in the buffer, then just trigger
-  // the 'readable' event and move on.
-  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
-    debug('read: emitReadable', state.length, state.ended);
-    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
-    return null;
-  }
-
-  n = howMuchToRead(n, state);
-
-  // if we've ended, and we're now clear, then finish it up.
-  if (n === 0 && state.ended) {
-    if (state.length === 0) endReadable(this);
-    return null;
-  }
-
-  // All the actual chunk generation logic needs to be
-  // *below* the call to _read.  The reason is that in certain
-  // synthetic stream cases, such as passthrough streams, _read
-  // may be a completely synchronous operation which may change
-  // the state of the read buffer, providing enough data when
-  // before there was *not* enough.
-  //
-  // So, the steps are:
-  // 1. Figure out what the state of things will be after we do
-  // a read from the buffer.
-  //
-  // 2. If that resulting state will trigger a _read, then call _read.
-  // Note that this may be asynchronous, or synchronous.  Yes, it is
-  // deeply ugly to write APIs this way, but that still doesn't mean
-  // that the Readable class should behave improperly, as streams are
-  // designed to be sync/async agnostic.
-  // Take note if the _read call is sync or async (ie, if the read call
-  // has returned yet), so that we know whether or not it's safe to emit
-  // 'readable' etc.
-  //
-  // 3. Actually pull the requested chunks out of the buffer and return.
-
-  // if we need a readable event, then we need to do some reading.
-  var doRead = state.needReadable;
-  debug('need readable', doRead);
-
-  // if we currently have less than the highWaterMark, then also read some
-  if (state.length === 0 || state.length - n < state.highWaterMark) {
-    doRead = true;
-    debug('length less than watermark', doRead);
-  }
-
-  // however, if we've ended, then there's no point, and if we're already
-  // reading, then it's unnecessary.
-  if (state.ended || state.reading) {
-    doRead = false;
-    debug('reading or ended', doRead);
-  } else if (doRead) {
-    debug('do read');
-    state.reading = true;
-    state.sync = true;
-    // if the length is currently zero, then we *need* a readable event.
-    if (state.length === 0) state.needReadable = true;
-    // call internal read method
-    this._read(state.highWaterMark);
-    state.sync = false;
-    // If _read pushed data synchronously, then `reading` will be false,
-    // and we need to re-evaluate how much data we can return to the user.
-    if (!state.reading) n = howMuchToRead(nOrig, state);
-  }
-
-  var ret;
-  if (n > 0) ret = fromList(n, state);else ret = null;
-
-  if (ret === null) {
-    state.needReadable = true;
-    n = 0;
-  } else {
-    state.length -= n;
-  }
-
-  if (state.length === 0) {
-    // If we have nothing in the buffer, then we want to know
-    // as soon as we *do* get something into the buffer.
-    if (!state.ended) state.needReadable = true;
-
-    // If we tried to read() past the EOF, then emit end on the next tick.
-    if (nOrig !== n && state.ended) endReadable(this);
-  }
-
-  if (ret !== null) this.emit('data', ret);
-
-  return ret;
-};
-
-function onEofChunk(stream, state) {
-  if (state.ended) return;
-  if (state.decoder) {
-    var chunk = state.decoder.end();
-    if (chunk && chunk.length) {
-      state.buffer.push(chunk);
-      state.length += state.objectMode ? 1 : chunk.length;
-    }
-  }
-  state.ended = true;
-
-  // emit 'readable' now to make sure it gets picked up.
-  emitReadable(stream);
-}
-
-// Don't emit readable right away in sync mode, because this can trigger
-// another read() call => stack overflow.  This way, it might trigger
-// a nextTick recursion warning, but that's not so bad.
-function emitReadable(stream) {
-  var state = stream._readableState;
-  state.needReadable = false;
-  if (!state.emittedReadable) {
-    debug('emitReadable', state.flowing);
-    state.emittedReadable = true;
-    if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);
-  }
-}
-
-function emitReadable_(stream) {
-  debug('emit readable');
-  stream.emit('readable');
-  flow(stream);
-}
-
-// at this point, the user has presumably seen the 'readable' event,
-// and called read() to consume some data.  that may have triggered
-// in turn another _read(n) call, in which case reading = true if
-// it's in progress.
-// However, if we're not ended, or reading, and the length < hwm,
-// then go ahead and try to read some more preemptively.
-function maybeReadMore(stream, state) {
-  if (!state.readingMore) {
-    state.readingMore = true;
-    pna.nextTick(maybeReadMore_, stream, state);
-  }
-}
-
-function maybeReadMore_(stream, state) {
-  var len = state.length;
-  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
-    debug('maybeReadMore read 0');
-    stream.read(0);
-    if (len === state.length)
-      // didn't get any data, stop spinning.
-      break;else len = state.length;
-  }
-  state.readingMore = false;
-}
-
-// abstract method.  to be overridden in specific implementation classes.
-// call cb(er, data) where data is <= n in length.
-// for virtual (non-string, non-buffer) streams, "length" is somewhat
-// arbitrary, and perhaps not very meaningful.
-Readable.prototype._read = function (n) {
-  this.emit('error', new Error('_read() is not implemented'));
-};
-
-Readable.prototype.pipe = function (dest, pipeOpts) {
-  var src = this;
-  var state = this._readableState;
-
-  switch (state.pipesCount) {
-    case 0:
-      state.pipes = dest;
-      break;
-    case 1:
-      state.pipes = [state.pipes, dest];
-      break;
-    default:
-      state.pipes.push(dest);
-      break;
-  }
-  state.pipesCount += 1;
-  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
-
-  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
-
-  var endFn = doEnd ? onend : unpipe;
-  if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn);
-
-  dest.on('unpipe', onunpipe);
-  function onunpipe(readable, unpipeInfo) {
-    debug('onunpipe');
-    if (readable === src) {
-      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
-        unpipeInfo.hasUnpiped = true;
-        cleanup();
-      }
-    }
-  }
-
-  function onend() {
-    debug('onend');
-    dest.end();
-  }
-
-  // when the dest drains, it reduces the awaitDrain counter
-  // on the source.  This would be more elegant with a .once()
-  // handler in flow(), but adding and removing repeatedly is
-  // too slow.
-  var ondrain = pipeOnDrain(src);
-  dest.on('drain', ondrain);
-
-  var cleanedUp = false;
-  function cleanup() {
-    debug('cleanup');
-    // cleanup event handlers once the pipe is broken
-    dest.removeListener('close', onclose);
-    dest.removeListener('finish', onfinish);
-    dest.removeListener('drain', ondrain);
-    dest.removeListener('error', onerror);
-    dest.removeListener('unpipe', onunpipe);
-    src.removeListener('end', onend);
-    src.removeListener('end', unpipe);
-    src.removeListener('data', ondata);
-
-    cleanedUp = true;
-
-    // if the reader is waiting for a drain event from this
-    // specific writer, then it would cause it to never start
-    // flowing again.
-    // So, if this is awaiting a drain, then we just call it now.
-    // If we don't know, then assume that we are waiting for one.
-    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
-  }
-
-  // If the user pushes more data while we're writing to dest then we'll end up
-  // in ondata again. However, we only want to increase awaitDrain once because
-  // dest will only emit one 'drain' event for the multiple writes.
-  // => Introduce a guard on increasing awaitDrain.
-  var increasedAwaitDrain = false;
-  src.on('data', ondata);
-  function ondata(chunk) {
-    debug('ondata');
-    increasedAwaitDrain = false;
-    var ret = dest.write(chunk);
-    if (false === ret && !increasedAwaitDrain) {
-      // If the user unpiped during `dest.write()`, it is possible
-      // to get stuck in a permanently paused state if that write
-      // also returned false.
-      // => Check whether `dest` is still a piping destination.
-      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
-        debug('false write response, pause', src._readableState.awaitDrain);
-        src._readableState.awaitDrain++;
-        increasedAwaitDrain = true;
-      }
-      src.pause();
-    }
-  }
-
-  // if the dest has an error, then stop piping into it.
-  // however, don't suppress the throwing behavior for this.
-  function onerror(er) {
-    debug('onerror', er);
-    unpipe();
-    dest.removeListener('error', onerror);
-    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
-  }
-
-  // Make sure our error handler is attached before userland ones.
-  prependListener(dest, 'error', onerror);
-
-  // Both close and finish should trigger unpipe, but only once.
-  function onclose() {
-    dest.removeListener('finish', onfinish);
-    unpipe();
-  }
-  dest.once('close', onclose);
-  function onfinish() {
-    debug('onfinish');
-    dest.removeListener('close', onclose);
-    unpipe();
-  }
-  dest.once('finish', onfinish);
-
-  function unpipe() {
-    debug('unpipe');
-    src.unpipe(dest);
-  }
-
-  // tell the dest that it's being piped to
-  dest.emit('pipe', src);
-
-  // start the flow if it hasn't been started already.
-  if (!state.flowing) {
-    debug('pipe resume');
-    src.resume();
-  }
-
-  return dest;
-};
-
-function pipeOnDrain(src) {
-  return function () {
-    var state = src._readableState;
-    debug('pipeOnDrain', state.awaitDrain);
-    if (state.awaitDrain) state.awaitDrain--;
-    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
-      state.flowing = true;
-      flow(src);
-    }
-  };
-}
-
-Readable.prototype.unpipe = function (dest) {
-  var state = this._readableState;
-  var unpipeInfo = { hasUnpiped: false };
-
-  // if we're not piping anywhere, then do nothing.
-  if (state.pipesCount === 0) return this;
-
-  // just one destination.  most common case.
-  if (state.pipesCount === 1) {
-    // passed in one, but it's not the right one.
-    if (dest && dest !== state.pipes) return this;
-
-    if (!dest) dest = state.pipes;
-
-    // got a match.
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-    if (dest) dest.emit('unpipe', this, unpipeInfo);
-    return this;
-  }
-
-  // slow case. multiple pipe destinations.
-
-  if (!dest) {
-    // remove all.
-    var dests = state.pipes;
-    var len = state.pipesCount;
-    state.pipes = null;
-    state.pipesCount = 0;
-    state.flowing = false;
-
-    for (var i = 0; i < len; i++) {
-      dests[i].emit('unpipe', this, unpipeInfo);
-    }return this;
-  }
-
-  // try to find the right one.
-  var index = indexOf(state.pipes, dest);
-  if (index === -1) return this;
-
-  state.pipes.splice(index, 1);
-  state.pipesCount -= 1;
-  if (state.pipesCount === 1) state.pipes = state.pipes[0];
-
-  dest.emit('unpipe', this, unpipeInfo);
-
-  return this;
-};
-
-// set up data events if they are asked for
-// Ensure readable listeners eventually get something
-Readable.prototype.on = function (ev, fn) {
-  var res = Stream.prototype.on.call(this, ev, fn);
-
-  if (ev === 'data') {
-    // Start flowing on next tick if stream isn't explicitly paused
-    if (this._readableState.flowing !== false) this.resume();
-  } else if (ev === 'readable') {
-    var state = this._readableState;
-    if (!state.endEmitted && !state.readableListening) {
-      state.readableListening = state.needReadable = true;
-      state.emittedReadable = false;
-      if (!state.reading) {
-        pna.nextTick(nReadingNextTick, this);
-      } else if (state.length) {
-        emitReadable(this);
-      }
-    }
-  }
-
-  return res;
-};
-Readable.prototype.addListener = Readable.prototype.on;
-
-function nReadingNextTick(self) {
-  debug('readable nexttick read 0');
-  self.read(0);
-}
-
-// pause() and resume() are remnants of the legacy readable stream API
-// If the user uses them, then switch into old mode.
-Readable.prototype.resume = function () {
-  var state = this._readableState;
-  if (!state.flowing) {
-    debug('resume');
-    state.flowing = true;
-    resume(this, state);
-  }
-  return this;
-};
-
-function resume(stream, state) {
-  if (!state.resumeScheduled) {
-    state.resumeScheduled = true;
-    pna.nextTick(resume_, stream, state);
-  }
-}
-
-function resume_(stream, state) {
-  if (!state.reading) {
-    debug('resume read 0');
-    stream.read(0);
-  }
-
-  state.resumeScheduled = false;
-  state.awaitDrain = 0;
-  stream.emit('resume');
-  flow(stream);
-  if (state.flowing && !state.reading) stream.read(0);
-}
-
-Readable.prototype.pause = function () {
-  debug('call pause flowing=%j', this._readableState.flowing);
-  if (false !== this._readableState.flowing) {
-    debug('pause');
-    this._readableState.flowing = false;
-    this.emit('pause');
-  }
-  return this;
-};
-
-function flow(stream) {
-  var state = stream._readableState;
-  debug('flow', state.flowing);
-  while (state.flowing && stream.read() !== null) {}
-}
-
-// wrap an old-style stream as the async data source.
-// This is *not* part of the readable stream interface.
-// It is an ugly unfortunate mess of history.
-Readable.prototype.wrap = function (stream) {
-  var _this = this;
-
-  var state = this._readableState;
-  var paused = false;
-
-  stream.on('end', function () {
-    debug('wrapped end');
-    if (state.decoder && !state.ended) {
-      var chunk = state.decoder.end();
-      if (chunk && chunk.length) _this.push(chunk);
-    }
-
-    _this.push(null);
-  });
-
-  stream.on('data', function (chunk) {
-    debug('wrapped data');
-    if (state.decoder) chunk = state.decoder.write(chunk);
-
-    // don't skip over falsy values in objectMode
-    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
-
-    var ret = _this.push(chunk);
-    if (!ret) {
-      paused = true;
-      stream.pause();
-    }
-  });
-
-  // proxy all the other methods.
-  // important when wrapping filters and duplexes.
-  for (var i in stream) {
-    if (this[i] === undefined && typeof stream[i] === 'function') {
-      this[i] = function (method) {
-        return function () {
-          return stream[method].apply(stream, arguments);
-        };
-      }(i);
-    }
-  }
-
-  // proxy certain important events.
-  for (var n = 0; n < kProxyEvents.length; n++) {
-    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
-  }
-
-  // when we try to consume some more bytes, simply unpause the
-  // underlying stream.
-  this._read = function (n) {
-    debug('wrapped _read', n);
-    if (paused) {
-      paused = false;
-      stream.resume();
-    }
-  };
-
-  return this;
-};
-
-Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._readableState.highWaterMark;
-  }
-});
-
-// exposed for testing purposes only.
-Readable._fromList = fromList;
-
-// Pluck off n bytes from an array of buffers.
-// Length is the combined lengths of all the buffers in the list.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function fromList(n, state) {
-  // nothing buffered
-  if (state.length === 0) return null;
-
-  var ret;
-  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
-    // read it all, truncate the list
-    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
-    state.buffer.clear();
-  } else {
-    // read part of list
-    ret = fromListPartial(n, state.buffer, state.decoder);
-  }
-
-  return ret;
-}
-
-// Extracts only enough buffered data to satisfy the amount requested.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function fromListPartial(n, list, hasStrings) {
-  var ret;
-  if (n < list.head.data.length) {
-    // slice is the same for buffers and strings
-    ret = list.head.data.slice(0, n);
-    list.head.data = list.head.data.slice(n);
-  } else if (n === list.head.data.length) {
-    // first chunk is a perfect match
-    ret = list.shift();
-  } else {
-    // result spans more than one buffer
-    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
-  }
-  return ret;
-}
-
-// Copies a specified amount of characters from the list of buffered data
-// chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBufferString(n, list) {
-  var p = list.head;
-  var c = 1;
-  var ret = p.data;
-  n -= ret.length;
-  while (p = p.next) {
-    var str = p.data;
-    var nb = n > str.length ? str.length : n;
-    if (nb === str.length) ret += str;else ret += str.slice(0, n);
-    n -= nb;
-    if (n === 0) {
-      if (nb === str.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = str.slice(nb);
-      }
-      break;
-    }
-    ++c;
-  }
-  list.length -= c;
-  return ret;
-}
-
-// Copies a specified amount of bytes from the list of buffered data chunks.
-// This function is designed to be inlinable, so please take care when making
-// changes to the function body.
-function copyFromBuffer(n, list) {
-  var ret = Buffer.allocUnsafe(n);
-  var p = list.head;
-  var c = 1;
-  p.data.copy(ret);
-  n -= p.data.length;
-  while (p = p.next) {
-    var buf = p.data;
-    var nb = n > buf.length ? buf.length : n;
-    buf.copy(ret, ret.length - n, 0, nb);
-    n -= nb;
-    if (n === 0) {
-      if (nb === buf.length) {
-        ++c;
-        if (p.next) list.head = p.next;else list.head = list.tail = null;
-      } else {
-        list.head = p;
-        p.data = buf.slice(nb);
-      }
-      break;
-    }
-    ++c;
-  }
-  list.length -= c;
-  return ret;
-}
-
-function endReadable(stream) {
-  var state = stream._readableState;
-
-  // If we get here before consuming all the bytes, then that is a
-  // bug in node.  Should never happen.
-  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
-
-  if (!state.endEmitted) {
-    state.ended = true;
-    pna.nextTick(endReadableNT, state, stream);
-  }
-}
-
-function endReadableNT(state, stream) {
-  // Check that we didn't get one last unshift.
-  if (!state.endEmitted && state.length === 0) {
-    state.endEmitted = true;
-    stream.readable = false;
-    stream.emit('end');
-  }
-}
-
-function indexOf(xs, x) {
-  for (var i = 0, l = xs.length; i < l; i++) {
-    if (xs[i] === x) return i;
-  }
-  return -1;
-}
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"./_stream_duplex":14,"./internal/streams/BufferList":19,"./internal/streams/destroy":20,"./internal/streams/stream":21,"_process":12,"core-util-is":5,"events":6,"inherits":8,"isarray":10,"process-nextick-args":11,"safe-buffer":22,"string_decoder/":23,"util":3}],17:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// a transform stream is a readable/writable stream where you do
-// something with the data.  Sometimes it's called a "filter",
-// but that's not a great name for it, since that implies a thing where
-// some bits pass through, and others are simply ignored.  (That would
-// be a valid example of a transform, of course.)
-//
-// While the output is causally related to the input, it's not a
-// necessarily symmetric or synchronous transformation.  For example,
-// a zlib stream might take multiple plain-text writes(), and then
-// emit a single compressed chunk some time in the future.
-//
-// Here's how this works:
-//
-// The Transform stream has all the aspects of the readable and writable
-// stream classes.  When you write(chunk), that calls _write(chunk,cb)
-// internally, and returns false if there's a lot of pending writes
-// buffered up.  When you call read(), that calls _read(n) until
-// there's enough pending readable data buffered up.
-//
-// In a transform stream, the written data is placed in a buffer.  When
-// _read(n) is called, it transforms the queued up data, calling the
-// buffered _write cb's as it consumes chunks.  If consuming a single
-// written chunk would result in multiple output chunks, then the first
-// outputted bit calls the readcb, and subsequent chunks just go into
-// the read buffer, and will cause it to emit 'readable' if necessary.
-//
-// This way, back-pressure is actually determined by the reading side,
-// since _read has to be called to start processing a new chunk.  However,
-// a pathological inflate type of transform can cause excessive buffering
-// here.  For example, imagine a stream where every byte of input is
-// interpreted as an integer from 0-255, and then results in that many
-// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
-// 1kb of data being output.  In this case, you could write a very small
-// amount of input, and end up with a very large amount of output.  In
-// such a pathological inflating mechanism, there'd be no way to tell
-// the system to stop doing the transform.  A single 4MB write could
-// cause the system to run out of memory.
-//
-// However, even in such a pathological case, only a single written chunk
-// would be consumed, and then the rest would wait (un-transformed) until
-// the results of the previous transformed chunk were consumed.
-
-'use strict';
-
-module.exports = Transform;
-
-var Duplex = require('./_stream_duplex');
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-util.inherits(Transform, Duplex);
-
-function afterTransform(er, data) {
-  var ts = this._transformState;
-  ts.transforming = false;
-
-  var cb = ts.writecb;
-
-  if (!cb) {
-    return this.emit('error', new Error('write callback called multiple times'));
-  }
-
-  ts.writechunk = null;
-  ts.writecb = null;
-
-  if (data != null) // single equals check for both `null` and `undefined`
-    this.push(data);
-
-  cb(er);
-
-  var rs = this._readableState;
-  rs.reading = false;
-  if (rs.needReadable || rs.length < rs.highWaterMark) {
-    this._read(rs.highWaterMark);
-  }
-}
-
-function Transform(options) {
-  if (!(this instanceof Transform)) return new Transform(options);
-
-  Duplex.call(this, options);
-
-  this._transformState = {
-    afterTransform: afterTransform.bind(this),
-    needTransform: false,
-    transforming: false,
-    writecb: null,
-    writechunk: null,
-    writeencoding: null
-  };
-
-  // start out asking for a readable event once data is transformed.
-  this._readableState.needReadable = true;
-
-  // we have implemented the _read method, and done the other things
-  // that Readable wants before the first _read call, so unset the
-  // sync guard flag.
-  this._readableState.sync = false;
-
-  if (options) {
-    if (typeof options.transform === 'function') this._transform = options.transform;
-
-    if (typeof options.flush === 'function') this._flush = options.flush;
-  }
-
-  // When the writable side finishes, then flush out anything remaining.
-  this.on('prefinish', prefinish);
-}
-
-function prefinish() {
-  var _this = this;
-
-  if (typeof this._flush === 'function') {
-    this._flush(function (er, data) {
-      done(_this, er, data);
-    });
-  } else {
-    done(this, null, null);
-  }
-}
-
-Transform.prototype.push = function (chunk, encoding) {
-  this._transformState.needTransform = false;
-  return Duplex.prototype.push.call(this, chunk, encoding);
-};
-
-// This is the part where you do stuff!
-// override this function in implementation classes.
-// 'chunk' is an input chunk.
-//
-// Call `push(newChunk)` to pass along transformed output
-// to the readable side.  You may call 'push' zero or more times.
-//
-// Call `cb(err)` when you are done with this chunk.  If you pass
-// an error, then that'll put the hurt on the whole operation.  If you
-// never call cb(), then you'll never get another chunk.
-Transform.prototype._transform = function (chunk, encoding, cb) {
-  throw new Error('_transform() is not implemented');
-};
-
-Transform.prototype._write = function (chunk, encoding, cb) {
-  var ts = this._transformState;
-  ts.writecb = cb;
-  ts.writechunk = chunk;
-  ts.writeencoding = encoding;
-  if (!ts.transforming) {
-    var rs = this._readableState;
-    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
-  }
-};
-
-// Doesn't matter what the args are here.
-// _transform does all the work.
-// That we got here means that the readable side wants more data.
-Transform.prototype._read = function (n) {
-  var ts = this._transformState;
-
-  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
-    ts.transforming = true;
-    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
-  } else {
-    // mark that we need a transform, so that any data that comes in
-    // will get processed, now that we've asked for it.
-    ts.needTransform = true;
-  }
-};
-
-Transform.prototype._destroy = function (err, cb) {
-  var _this2 = this;
-
-  Duplex.prototype._destroy.call(this, err, function (err2) {
-    cb(err2);
-    _this2.emit('close');
-  });
-};
-
-function done(stream, er, data) {
-  if (er) return stream.emit('error', er);
-
-  if (data != null) // single equals check for both `null` and `undefined`
-    stream.push(data);
-
-  // if there's nothing in the write buffer, then that means
-  // that nothing more will ever be provided
-  if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');
-
-  if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');
-
-  return stream.push(null);
-}
-},{"./_stream_duplex":14,"core-util-is":5,"inherits":8}],18:[function(require,module,exports){
-(function (process,global,setImmediate){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-// A bit simpler than readable streams.
-// Implement an async ._write(chunk, encoding, cb), and it'll handle all
-// the drain event emission and buffering.
-
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-module.exports = Writable;
-
-/* <replacement> */
-function WriteReq(chunk, encoding, cb) {
-  this.chunk = chunk;
-  this.encoding = encoding;
-  this.callback = cb;
-  this.next = null;
-}
-
-// It seems a linked list but it is not
-// there will be only 2 of these for each stream
-function CorkedRequest(state) {
-  var _this = this;
-
-  this.next = null;
-  this.entry = null;
-  this.finish = function () {
-    onCorkedFinish(_this, state);
-  };
-}
-/* </replacement> */
-
-/*<replacement>*/
-var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
-/*</replacement>*/
-
-/*<replacement>*/
-var Duplex;
-/*</replacement>*/
-
-Writable.WritableState = WritableState;
-
-/*<replacement>*/
-var util = Object.create(require('core-util-is'));
-util.inherits = require('inherits');
-/*</replacement>*/
-
-/*<replacement>*/
-var internalUtil = {
-  deprecate: require('util-deprecate')
-};
-/*</replacement>*/
-
-/*<replacement>*/
-var Stream = require('./internal/streams/stream');
-/*</replacement>*/
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-var OurUint8Array = global.Uint8Array || function () {};
-function _uint8ArrayToBuffer(chunk) {
-  return Buffer.from(chunk);
-}
-function _isUint8Array(obj) {
-  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
-}
-
-/*</replacement>*/
-
-var destroyImpl = require('./internal/streams/destroy');
-
-util.inherits(Writable, Stream);
-
-function nop() {}
-
-function WritableState(options, stream) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  options = options || {};
-
-  // Duplex streams are both readable and writable, but share
-  // the same options object.
-  // However, some cases require setting options to different
-  // values for the readable and the writable sides of the duplex stream.
-  // These options can be provided separately as readableXXX and writableXXX.
-  var isDuplex = stream instanceof Duplex;
-
-  // object stream flag to indicate whether or not this stream
-  // contains buffers or objects.
-  this.objectMode = !!options.objectMode;
-
-  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
-
-  // the point at which write() starts returning false
-  // Note: 0 is a valid value, means that we always return false if
-  // the entire buffer is not flushed immediately on write()
-  var hwm = options.highWaterMark;
-  var writableHwm = options.writableHighWaterMark;
-  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
-
-  if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
-
-  // cast to ints.
-  this.highWaterMark = Math.floor(this.highWaterMark);
-
-  // if _final has been called
-  this.finalCalled = false;
-
-  // drain event flag.
-  this.needDrain = false;
-  // at the start of calling end()
-  this.ending = false;
-  // when end() has been called, and returned
-  this.ended = false;
-  // when 'finish' is emitted
-  this.finished = false;
-
-  // has it been destroyed
-  this.destroyed = false;
-
-  // should we decode strings into buffers before passing to _write?
-  // this is here so that some node-core streams can optimize string
-  // handling at a lower level.
-  var noDecode = options.decodeStrings === false;
-  this.decodeStrings = !noDecode;
-
-  // Crypto is kind of old and crusty.  Historically, its default string
-  // encoding is 'binary' so we have to make this configurable.
-  // Everything else in the universe uses 'utf8', though.
-  this.defaultEncoding = options.defaultEncoding || 'utf8';
-
-  // not an actual buffer we keep track of, but a measurement
-  // of how much we're waiting to get pushed to some underlying
-  // socket or file.
-  this.length = 0;
-
-  // a flag to see when we're in the middle of a write.
-  this.writing = false;
-
-  // when true all writes will be buffered until .uncork() call
-  this.corked = 0;
-
-  // a flag to be able to tell if the onwrite cb is called immediately,
-  // or on a later tick.  We set this to true at first, because any
-  // actions that shouldn't happen until "later" should generally also
-  // not happen before the first write call.
-  this.sync = true;
-
-  // a flag to know if we're processing previously buffered items, which
-  // may call the _write() callback in the same tick, so that we don't
-  // end up in an overlapped onwrite situation.
-  this.bufferProcessing = false;
-
-  // the callback that's passed to _write(chunk,cb)
-  this.onwrite = function (er) {
-    onwrite(stream, er);
-  };
-
-  // the callback that the user supplies to write(chunk,encoding,cb)
-  this.writecb = null;
-
-  // the amount that is being written when _write is called.
-  this.writelen = 0;
-
-  this.bufferedRequest = null;
-  this.lastBufferedRequest = null;
-
-  // number of pending user-supplied write callbacks
-  // this must be 0 before 'finish' can be emitted
-  this.pendingcb = 0;
-
-  // emit prefinish if the only thing we're waiting for is _write cbs
-  // This is relevant for synchronous Transform streams
-  this.prefinished = false;
-
-  // True if the error was already emitted and should not be thrown again
-  this.errorEmitted = false;
-
-  // count buffered requests
-  this.bufferedRequestCount = 0;
-
-  // allocate the first CorkedRequest, there is always
-  // one allocated and free to use, and we maintain at most two
-  this.corkedRequestsFree = new CorkedRequest(this);
-}
-
-WritableState.prototype.getBuffer = function getBuffer() {
-  var current = this.bufferedRequest;
-  var out = [];
-  while (current) {
-    out.push(current);
-    current = current.next;
-  }
-  return out;
-};
-
-(function () {
-  try {
-    Object.defineProperty(WritableState.prototype, 'buffer', {
-      get: internalUtil.deprecate(function () {
-        return this.getBuffer();
-      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
-    });
-  } catch (_) {}
-})();
-
-// Test _writableState for inheritance to account for Duplex streams,
-// whose prototype chain only points to Readable.
-var realHasInstance;
-if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
-  realHasInstance = Function.prototype[Symbol.hasInstance];
-  Object.defineProperty(Writable, Symbol.hasInstance, {
-    value: function (object) {
-      if (realHasInstance.call(this, object)) return true;
-      if (this !== Writable) return false;
-
-      return object && object._writableState instanceof WritableState;
-    }
-  });
-} else {
-  realHasInstance = function (object) {
-    return object instanceof this;
-  };
-}
-
-function Writable(options) {
-  Duplex = Duplex || require('./_stream_duplex');
-
-  // Writable ctor is applied to Duplexes, too.
-  // `realHasInstance` is necessary because using plain `instanceof`
-  // would return false, as no `_writableState` property is attached.
-
-  // Trying to use the custom `instanceof` for Writable here will also break the
-  // Node.js LazyTransform implementation, which has a non-trivial getter for
-  // `_writableState` that would lead to infinite recursion.
-  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
-    return new Writable(options);
-  }
-
-  this._writableState = new WritableState(options, this);
-
-  // legacy.
-  this.writable = true;
-
-  if (options) {
-    if (typeof options.write === 'function') this._write = options.write;
-
-    if (typeof options.writev === 'function') this._writev = options.writev;
-
-    if (typeof options.destroy === 'function') this._destroy = options.destroy;
-
-    if (typeof options.final === 'function') this._final = options.final;
-  }
-
-  Stream.call(this);
-}
-
-// Otherwise people can pipe Writable streams, which is just wrong.
-Writable.prototype.pipe = function () {
-  this.emit('error', new Error('Cannot pipe, not readable'));
-};
-
-function writeAfterEnd(stream, cb) {
-  var er = new Error('write after end');
-  // TODO: defer error events consistently everywhere, not just the cb
-  stream.emit('error', er);
-  pna.nextTick(cb, er);
-}
-
-// Checks that a user-supplied chunk is valid, especially for the particular
-// mode the stream is in. Currently this means that `null` is never accepted
-// and undefined/non-string values are only allowed in object mode.
-function validChunk(stream, state, chunk, cb) {
-  var valid = true;
-  var er = false;
-
-  if (chunk === null) {
-    er = new TypeError('May not write null values to stream');
-  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
-    er = new TypeError('Invalid non-string/buffer chunk');
-  }
-  if (er) {
-    stream.emit('error', er);
-    pna.nextTick(cb, er);
-    valid = false;
-  }
-  return valid;
-}
-
-Writable.prototype.write = function (chunk, encoding, cb) {
-  var state = this._writableState;
-  var ret = false;
-  var isBuf = !state.objectMode && _isUint8Array(chunk);
-
-  if (isBuf && !Buffer.isBuffer(chunk)) {
-    chunk = _uint8ArrayToBuffer(chunk);
-  }
-
-  if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
-
-  if (typeof cb !== 'function') cb = nop;
-
-  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
-    state.pendingcb++;
-    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
-  }
-
-  return ret;
-};
-
-Writable.prototype.cork = function () {
-  var state = this._writableState;
-
-  state.corked++;
-};
-
-Writable.prototype.uncork = function () {
-  var state = this._writableState;
-
-  if (state.corked) {
-    state.corked--;
-
-    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
-  }
-};
-
-Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
-  // node::ParseEncoding() requires lower case.
-  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
-  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
-  this._writableState.defaultEncoding = encoding;
-  return this;
-};
-
-function decodeChunk(state, chunk, encoding) {
-  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
-    chunk = Buffer.from(chunk, encoding);
-  }
-  return chunk;
-}
-
-Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
-  // making it explicit this property is not enumerable
-  // because otherwise some prototype manipulation in
-  // userland will fail
-  enumerable: false,
-  get: function () {
-    return this._writableState.highWaterMark;
-  }
-});
-
-// if we're already writing something, then just put this
-// in the queue, and wait our turn.  Otherwise, call _write
-// If we return false, then we need a drain event, so set that flag.
-function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
-  if (!isBuf) {
-    var newChunk = decodeChunk(state, chunk, encoding);
-    if (chunk !== newChunk) {
-      isBuf = true;
-      encoding = 'buffer';
-      chunk = newChunk;
-    }
-  }
-  var len = state.objectMode ? 1 : chunk.length;
-
-  state.length += len;
-
-  var ret = state.length < state.highWaterMark;
-  // we must ensure that previous needDrain will not be reset to false.
-  if (!ret) state.needDrain = true;
-
-  if (state.writing || state.corked) {
-    var last = state.lastBufferedRequest;
-    state.lastBufferedRequest = {
-      chunk: chunk,
-      encoding: encoding,
-      isBuf: isBuf,
-      callback: cb,
-      next: null
-    };
-    if (last) {
-      last.next = state.lastBufferedRequest;
-    } else {
-      state.bufferedRequest = state.lastBufferedRequest;
-    }
-    state.bufferedRequestCount += 1;
-  } else {
-    doWrite(stream, state, false, len, chunk, encoding, cb);
-  }
-
-  return ret;
-}
-
-function doWrite(stream, state, writev, len, chunk, encoding, cb) {
-  state.writelen = len;
-  state.writecb = cb;
-  state.writing = true;
-  state.sync = true;
-  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
-  state.sync = false;
-}
-
-function onwriteError(stream, state, sync, er, cb) {
-  --state.pendingcb;
-
-  if (sync) {
-    // defer the callback if we are being called synchronously
-    // to avoid piling up things on the stack
-    pna.nextTick(cb, er);
-    // this can emit finish, and it will always happen
-    // after error
-    pna.nextTick(finishMaybe, stream, state);
-    stream._writableState.errorEmitted = true;
-    stream.emit('error', er);
-  } else {
-    // the caller expect this to happen before if
-    // it is async
-    cb(er);
-    stream._writableState.errorEmitted = true;
-    stream.emit('error', er);
-    // this can emit finish, but finish must
-    // always follow error
-    finishMaybe(stream, state);
-  }
-}
-
-function onwriteStateUpdate(state) {
-  state.writing = false;
-  state.writecb = null;
-  state.length -= state.writelen;
-  state.writelen = 0;
-}
-
-function onwrite(stream, er) {
-  var state = stream._writableState;
-  var sync = state.sync;
-  var cb = state.writecb;
-
-  onwriteStateUpdate(state);
-
-  if (er) onwriteError(stream, state, sync, er, cb);else {
-    // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(state);
-
-    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
-      clearBuffer(stream, state);
-    }
-
-    if (sync) {
-      /*<replacement>*/
-      asyncWrite(afterWrite, stream, state, finished, cb);
-      /*</replacement>*/
-    } else {
-      afterWrite(stream, state, finished, cb);
-    }
-  }
-}
-
-function afterWrite(stream, state, finished, cb) {
-  if (!finished) onwriteDrain(stream, state);
-  state.pendingcb--;
-  cb();
-  finishMaybe(stream, state);
-}
-
-// Must force callback to be called on nextTick, so that we don't
-// emit 'drain' before the write() consumer gets the 'false' return
-// value, and has a chance to attach a 'drain' listener.
-function onwriteDrain(stream, state) {
-  if (state.length === 0 && state.needDrain) {
-    state.needDrain = false;
-    stream.emit('drain');
-  }
-}
-
-// if there's something in the buffer waiting, then process it
-function clearBuffer(stream, state) {
-  state.bufferProcessing = true;
-  var entry = state.bufferedRequest;
-
-  if (stream._writev && entry && entry.next) {
-    // Fast case, write everything using _writev()
-    var l = state.bufferedRequestCount;
-    var buffer = new Array(l);
-    var holder = state.corkedRequestsFree;
-    holder.entry = entry;
-
-    var count = 0;
-    var allBuffers = true;
-    while (entry) {
-      buffer[count] = entry;
-      if (!entry.isBuf) allBuffers = false;
-      entry = entry.next;
-      count += 1;
-    }
-    buffer.allBuffers = allBuffers;
-
-    doWrite(stream, state, true, state.length, buffer, '', holder.finish);
-
-    // doWrite is almost always async, defer these to save a bit of time
-    // as the hot path ends with doWrite
-    state.pendingcb++;
-    state.lastBufferedRequest = null;
-    if (holder.next) {
-      state.corkedRequestsFree = holder.next;
-      holder.next = null;
-    } else {
-      state.corkedRequestsFree = new CorkedRequest(state);
-    }
-    state.bufferedRequestCount = 0;
-  } else {
-    // Slow case, write chunks one-by-one
-    while (entry) {
-      var chunk = entry.chunk;
-      var encoding = entry.encoding;
-      var cb = entry.callback;
-      var len = state.objectMode ? 1 : chunk.length;
-
-      doWrite(stream, state, false, len, chunk, encoding, cb);
-      entry = entry.next;
-      state.bufferedRequestCount--;
-      // if we didn't call the onwrite immediately, then
-      // it means that we need to wait until it does.
-      // also, that means that the chunk and cb are currently
-      // being processed, so move the buffer counter past them.
-      if (state.writing) {
-        break;
-      }
-    }
-
-    if (entry === null) state.lastBufferedRequest = null;
-  }
-
-  state.bufferedRequest = entry;
-  state.bufferProcessing = false;
-}
-
-Writable.prototype._write = function (chunk, encoding, cb) {
-  cb(new Error('_write() is not implemented'));
-};
-
-Writable.prototype._writev = null;
-
-Writable.prototype.end = function (chunk, encoding, cb) {
-  var state = this._writableState;
-
-  if (typeof chunk === 'function') {
-    cb = chunk;
-    chunk = null;
-    encoding = null;
-  } else if (typeof encoding === 'function') {
-    cb = encoding;
-    encoding = null;
-  }
-
-  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
-
-  // .end() fully uncorks
-  if (state.corked) {
-    state.corked = 1;
-    this.uncork();
-  }
-
-  // ignore unnecessary end() calls.
-  if (!state.ending && !state.finished) endWritable(this, state, cb);
-};
-
-function needFinish(state) {
-  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
-}
-function callFinal(stream, state) {
-  stream._final(function (err) {
-    state.pendingcb--;
-    if (err) {
-      stream.emit('error', err);
-    }
-    state.prefinished = true;
-    stream.emit('prefinish');
-    finishMaybe(stream, state);
-  });
-}
-function prefinish(stream, state) {
-  if (!state.prefinished && !state.finalCalled) {
-    if (typeof stream._final === 'function') {
-      state.pendingcb++;
-      state.finalCalled = true;
-      pna.nextTick(callFinal, stream, state);
-    } else {
-      state.prefinished = true;
-      stream.emit('prefinish');
-    }
-  }
-}
-
-function finishMaybe(stream, state) {
-  var need = needFinish(state);
-  if (need) {
-    prefinish(stream, state);
-    if (state.pendingcb === 0) {
-      state.finished = true;
-      stream.emit('finish');
-    }
-  }
-  return need;
-}
-
-function endWritable(stream, state, cb) {
-  state.ending = true;
-  finishMaybe(stream, state);
-  if (cb) {
-    if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);
-  }
-  state.ended = true;
-  stream.writable = false;
-}
-
-function onCorkedFinish(corkReq, state, err) {
-  var entry = corkReq.entry;
-  corkReq.entry = null;
-  while (entry) {
-    var cb = entry.callback;
-    state.pendingcb--;
-    cb(err);
-    entry = entry.next;
-  }
-  if (state.corkedRequestsFree) {
-    state.corkedRequestsFree.next = corkReq;
-  } else {
-    state.corkedRequestsFree = corkReq;
-  }
-}
-
-Object.defineProperty(Writable.prototype, 'destroyed', {
-  get: function () {
-    if (this._writableState === undefined) {
-      return false;
-    }
-    return this._writableState.destroyed;
-  },
-  set: function (value) {
-    // we ignore the value if the stream
-    // has not been initialized yet
-    if (!this._writableState) {
-      return;
-    }
-
-    // backward compatibility, the user is explicitly
-    // managing destroyed
-    this._writableState.destroyed = value;
-  }
-});
-
-Writable.prototype.destroy = destroyImpl.destroy;
-Writable.prototype._undestroy = destroyImpl.undestroy;
-Writable.prototype._destroy = function (err, cb) {
-  this.end();
-  cb(err);
-};
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("timers").setImmediate)
-},{"./_stream_duplex":14,"./internal/streams/destroy":20,"./internal/streams/stream":21,"_process":12,"core-util-is":5,"inherits":8,"process-nextick-args":11,"safe-buffer":22,"timers":29,"util-deprecate":30}],19:[function(require,module,exports){
-'use strict';
-
-function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
-
-var Buffer = require('safe-buffer').Buffer;
-var util = require('util');
-
-function copyBuffer(src, target, offset) {
-  src.copy(target, offset);
-}
-
-module.exports = function () {
-  function BufferList() {
-    _classCallCheck(this, BufferList);
-
-    this.head = null;
-    this.tail = null;
-    this.length = 0;
-  }
-
-  BufferList.prototype.push = function push(v) {
-    var entry = { data: v, next: null };
-    if (this.length > 0) this.tail.next = entry;else this.head = entry;
-    this.tail = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.unshift = function unshift(v) {
-    var entry = { data: v, next: this.head };
-    if (this.length === 0) this.tail = entry;
-    this.head = entry;
-    ++this.length;
-  };
-
-  BufferList.prototype.shift = function shift() {
-    if (this.length === 0) return;
-    var ret = this.head.data;
-    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
-    --this.length;
-    return ret;
-  };
-
-  BufferList.prototype.clear = function clear() {
-    this.head = this.tail = null;
-    this.length = 0;
-  };
-
-  BufferList.prototype.join = function join(s) {
-    if (this.length === 0) return '';
-    var p = this.head;
-    var ret = '' + p.data;
-    while (p = p.next) {
-      ret += s + p.data;
-    }return ret;
-  };
-
-  BufferList.prototype.concat = function concat(n) {
-    if (this.length === 0) return Buffer.alloc(0);
-    if (this.length === 1) return this.head.data;
-    var ret = Buffer.allocUnsafe(n >>> 0);
-    var p = this.head;
-    var i = 0;
-    while (p) {
-      copyBuffer(p.data, ret, i);
-      i += p.data.length;
-      p = p.next;
-    }
-    return ret;
-  };
-
-  return BufferList;
-}();
-
-if (util && util.inspect && util.inspect.custom) {
-  module.exports.prototype[util.inspect.custom] = function () {
-    var obj = util.inspect({ length: this.length });
-    return this.constructor.name + ' ' + obj;
-  };
-}
-},{"safe-buffer":22,"util":3}],20:[function(require,module,exports){
-'use strict';
-
-/*<replacement>*/
-
-var pna = require('process-nextick-args');
-/*</replacement>*/
-
-// undocumented cb() API, needed for core, not for public API
-function destroy(err, cb) {
-  var _this = this;
-
-  var readableDestroyed = this._readableState && this._readableState.destroyed;
-  var writableDestroyed = this._writableState && this._writableState.destroyed;
-
-  if (readableDestroyed || writableDestroyed) {
-    if (cb) {
-      cb(err);
-    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
-      pna.nextTick(emitErrorNT, this, err);
-    }
-    return this;
-  }
-
-  // we set destroyed to true before firing error callbacks in order
-  // to make it re-entrance safe in case destroy() is called within callbacks
-
-  if (this._readableState) {
-    this._readableState.destroyed = true;
-  }
-
-  // if this is a duplex stream mark the writable part as destroyed as well
-  if (this._writableState) {
-    this._writableState.destroyed = true;
-  }
-
-  this._destroy(err || null, function (err) {
-    if (!cb && err) {
-      pna.nextTick(emitErrorNT, _this, err);
-      if (_this._writableState) {
-        _this._writableState.errorEmitted = true;
-      }
-    } else if (cb) {
-      cb(err);
-    }
-  });
-
-  return this;
-}
-
-function undestroy() {
-  if (this._readableState) {
-    this._readableState.destroyed = false;
-    this._readableState.reading = false;
-    this._readableState.ended = false;
-    this._readableState.endEmitted = false;
-  }
-
-  if (this._writableState) {
-    this._writableState.destroyed = false;
-    this._writableState.ended = false;
-    this._writableState.ending = false;
-    this._writableState.finished = false;
-    this._writableState.errorEmitted = false;
-  }
-}
-
-function emitErrorNT(self, err) {
-  self.emit('error', err);
-}
-
-module.exports = {
-  destroy: destroy,
-  undestroy: undestroy
-};
-},{"process-nextick-args":11}],21:[function(require,module,exports){
-module.exports = require('events').EventEmitter;
-
-},{"events":6}],22:[function(require,module,exports){
-/* eslint-disable node/no-deprecated-api */
-var buffer = require('buffer')
-var Buffer = buffer.Buffer
-
-// alternative to using Object.keys for old browsers
-function copyProps (src, dst) {
-  for (var key in src) {
-    dst[key] = src[key]
-  }
-}
-if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
-  module.exports = buffer
-} else {
-  // Copy properties from require('buffer')
-  copyProps(buffer, exports)
-  exports.Buffer = SafeBuffer
-}
-
-function SafeBuffer (arg, encodingOrOffset, length) {
-  return Buffer(arg, encodingOrOffset, length)
-}
-
-// Copy static methods from Buffer
-copyProps(Buffer, SafeBuffer)
-
-SafeBuffer.from = function (arg, encodingOrOffset, length) {
-  if (typeof arg === 'number') {
-    throw new TypeError('Argument must not be a number')
-  }
-  return Buffer(arg, encodingOrOffset, length)
-}
-
-SafeBuffer.alloc = function (size, fill, encoding) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  var buf = Buffer(size)
-  if (fill !== undefined) {
-    if (typeof encoding === 'string') {
-      buf.fill(fill, encoding)
-    } else {
-      buf.fill(fill)
-    }
-  } else {
-    buf.fill(0)
-  }
-  return buf
-}
-
-SafeBuffer.allocUnsafe = function (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  return Buffer(size)
-}
-
-SafeBuffer.allocUnsafeSlow = function (size) {
-  if (typeof size !== 'number') {
-    throw new TypeError('Argument must be a number')
-  }
-  return buffer.SlowBuffer(size)
-}
-
-},{"buffer":4}],23:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-'use strict';
-
-/*<replacement>*/
-
-var Buffer = require('safe-buffer').Buffer;
-/*</replacement>*/
-
-var isEncoding = Buffer.isEncoding || function (encoding) {
-  encoding = '' + encoding;
-  switch (encoding && encoding.toLowerCase()) {
-    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
-      return true;
-    default:
-      return false;
-  }
-};
-
-function _normalizeEncoding(enc) {
-  if (!enc) return 'utf8';
-  var retried;
-  while (true) {
-    switch (enc) {
-      case 'utf8':
-      case 'utf-8':
-        return 'utf8';
-      case 'ucs2':
-      case 'ucs-2':
-      case 'utf16le':
-      case 'utf-16le':
-        return 'utf16le';
-      case 'latin1':
-      case 'binary':
-        return 'latin1';
-      case 'base64':
-      case 'ascii':
-      case 'hex':
-        return enc;
-      default:
-        if (retried) return; // undefined
-        enc = ('' + enc).toLowerCase();
-        retried = true;
-    }
-  }
-};
-
-// Do not cache `Buffer.isEncoding` when checking encoding names as some
-// modules monkey-patch it to support additional encodings
-function normalizeEncoding(enc) {
-  var nenc = _normalizeEncoding(enc);
-  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
-  return nenc || enc;
-}
-
-// StringDecoder provides an interface for efficiently splitting a series of
-// buffers into a series of JS strings without breaking apart multi-byte
-// characters.
-exports.StringDecoder = StringDecoder;
-function StringDecoder(encoding) {
-  this.encoding = normalizeEncoding(encoding);
-  var nb;
-  switch (this.encoding) {
-    case 'utf16le':
-      this.text = utf16Text;
-      this.end = utf16End;
-      nb = 4;
-      break;
-    case 'utf8':
-      this.fillLast = utf8FillLast;
-      nb = 4;
-      break;
-    case 'base64':
-      this.text = base64Text;
-      this.end = base64End;
-      nb = 3;
-      break;
-    default:
-      this.write = simpleWrite;
-      this.end = simpleEnd;
-      return;
-  }
-  this.lastNeed = 0;
-  this.lastTotal = 0;
-  this.lastChar = Buffer.allocUnsafe(nb);
-}
-
-StringDecoder.prototype.write = function (buf) {
-  if (buf.length === 0) return '';
-  var r;
-  var i;
-  if (this.lastNeed) {
-    r = this.fillLast(buf);
-    if (r === undefined) return '';
-    i = this.lastNeed;
-    this.lastNeed = 0;
-  } else {
-    i = 0;
-  }
-  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
-  return r || '';
-};
-
-StringDecoder.prototype.end = utf8End;
-
-// Returns only complete characters in a Buffer
-StringDecoder.prototype.text = utf8Text;
-
-// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
-StringDecoder.prototype.fillLast = function (buf) {
-  if (this.lastNeed <= buf.length) {
-    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
-    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
-  }
-  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
-  this.lastNeed -= buf.length;
-};
-
-// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
-// continuation byte. If an invalid byte is detected, -2 is returned.
-function utf8CheckByte(byte) {
-  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
-  return byte >> 6 === 0x02 ? -1 : -2;
-}
-
-// Checks at most 3 bytes at the end of a Buffer in order to detect an
-// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
-// needed to complete the UTF-8 character (if applicable) are returned.
-function utf8CheckIncomplete(self, buf, i) {
-  var j = buf.length - 1;
-  if (j < i) return 0;
-  var nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) self.lastNeed = nb - 1;
-    return nb;
-  }
-  if (--j < i || nb === -2) return 0;
-  nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) self.lastNeed = nb - 2;
-    return nb;
-  }
-  if (--j < i || nb === -2) return 0;
-  nb = utf8CheckByte(buf[j]);
-  if (nb >= 0) {
-    if (nb > 0) {
-      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
-    }
-    return nb;
-  }
-  return 0;
-}
-
-// Validates as many continuation bytes for a multi-byte UTF-8 character as
-// needed or are available. If we see a non-continuation byte where we expect
-// one, we "replace" the validated continuation bytes we've seen so far with
-// a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding
-// behavior. The continuation byte check is included three times in the case
-// where all of the continuation bytes for a character exist in the same buffer.
-// It is also done this way as a slight performance increase instead of using a
-// loop.
-function utf8CheckExtraBytes(self, buf, p) {
-  if ((buf[0] & 0xC0) !== 0x80) {
-    self.lastNeed = 0;
-    return '\ufffd';
-  }
-  if (self.lastNeed > 1 && buf.length > 1) {
-    if ((buf[1] & 0xC0) !== 0x80) {
-      self.lastNeed = 1;
-      return '\ufffd';
-    }
-    if (self.lastNeed > 2 && buf.length > 2) {
-      if ((buf[2] & 0xC0) !== 0x80) {
-        self.lastNeed = 2;
-        return '\ufffd';
-      }
-    }
-  }
-}
-
-// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
-function utf8FillLast(buf) {
-  var p = this.lastTotal - this.lastNeed;
-  var r = utf8CheckExtraBytes(this, buf, p);
-  if (r !== undefined) return r;
-  if (this.lastNeed <= buf.length) {
-    buf.copy(this.lastChar, p, 0, this.lastNeed);
-    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
-  }
-  buf.copy(this.lastChar, p, 0, buf.length);
-  this.lastNeed -= buf.length;
-}
-
-// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
-// partial character, the character's bytes are buffered until the required
-// number of bytes are available.
-function utf8Text(buf, i) {
-  var total = utf8CheckIncomplete(this, buf, i);
-  if (!this.lastNeed) return buf.toString('utf8', i);
-  this.lastTotal = total;
-  var end = buf.length - (total - this.lastNeed);
-  buf.copy(this.lastChar, 0, end);
-  return buf.toString('utf8', i, end);
-}
-
-// For UTF-8, a replacement character is added when ending on a partial
-// character.
-function utf8End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) return r + '\ufffd';
-  return r;
-}
-
-// UTF-16LE typically needs two bytes per character, but even if we have an even
-// number of bytes available, we need to check if we end on a leading/high
-// surrogate. In that case, we need to wait for the next two bytes in order to
-// decode the last character properly.
-function utf16Text(buf, i) {
-  if ((buf.length - i) % 2 === 0) {
-    var r = buf.toString('utf16le', i);
-    if (r) {
-      var c = r.charCodeAt(r.length - 1);
-      if (c >= 0xD800 && c <= 0xDBFF) {
-        this.lastNeed = 2;
-        this.lastTotal = 4;
-        this.lastChar[0] = buf[buf.length - 2];
-        this.lastChar[1] = buf[buf.length - 1];
-        return r.slice(0, -1);
-      }
-    }
-    return r;
-  }
-  this.lastNeed = 1;
-  this.lastTotal = 2;
-  this.lastChar[0] = buf[buf.length - 1];
-  return buf.toString('utf16le', i, buf.length - 1);
-}
-
-// For UTF-16LE we do not explicitly append special replacement characters if we
-// end on a partial character, we simply let v8 handle that.
-function utf16End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) {
-    var end = this.lastTotal - this.lastNeed;
-    return r + this.lastChar.toString('utf16le', 0, end);
-  }
-  return r;
-}
-
-function base64Text(buf, i) {
-  var n = (buf.length - i) % 3;
-  if (n === 0) return buf.toString('base64', i);
-  this.lastNeed = 3 - n;
-  this.lastTotal = 3;
-  if (n === 1) {
-    this.lastChar[0] = buf[buf.length - 1];
-  } else {
-    this.lastChar[0] = buf[buf.length - 2];
-    this.lastChar[1] = buf[buf.length - 1];
-  }
-  return buf.toString('base64', i, buf.length - n);
-}
-
-function base64End(buf) {
-  var r = buf && buf.length ? this.write(buf) : '';
-  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
-  return r;
-}
-
-// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
-function simpleWrite(buf) {
-  return buf.toString(this.encoding);
-}
-
-function simpleEnd(buf) {
-  return buf && buf.length ? this.write(buf) : '';
-}
-},{"safe-buffer":22}],24:[function(require,module,exports){
-module.exports = require('./readable').PassThrough
-
-},{"./readable":25}],25:[function(require,module,exports){
-exports = module.exports = require('./lib/_stream_readable.js');
-exports.Stream = exports;
-exports.Readable = exports;
-exports.Writable = require('./lib/_stream_writable.js');
-exports.Duplex = require('./lib/_stream_duplex.js');
-exports.Transform = require('./lib/_stream_transform.js');
-exports.PassThrough = require('./lib/_stream_passthrough.js');
-
-},{"./lib/_stream_duplex.js":14,"./lib/_stream_passthrough.js":15,"./lib/_stream_readable.js":16,"./lib/_stream_transform.js":17,"./lib/_stream_writable.js":18}],26:[function(require,module,exports){
-module.exports = require('./readable').Transform
-
-},{"./readable":25}],27:[function(require,module,exports){
-module.exports = require('./lib/_stream_writable.js');
-
-},{"./lib/_stream_writable.js":18}],28:[function(require,module,exports){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-module.exports = Stream;
-
-var EE = require('events').EventEmitter;
-var inherits = require('inherits');
-
-inherits(Stream, EE);
-Stream.Readable = require('readable-stream/readable.js');
-Stream.Writable = require('readable-stream/writable.js');
-Stream.Duplex = require('readable-stream/duplex.js');
-Stream.Transform = require('readable-stream/transform.js');
-Stream.PassThrough = require('readable-stream/passthrough.js');
-
-// Backwards-compat with node 0.4.x
-Stream.Stream = Stream;
-
-
-
-// old-style streams.  Note that the pipe method (the only relevant
-// part of this class) is overridden in the Readable class.
-
-function Stream() {
-  EE.call(this);
-}
-
-Stream.prototype.pipe = function(dest, options) {
-  var source = this;
-
-  function ondata(chunk) {
-    if (dest.writable) {
-      if (false === dest.write(chunk) && source.pause) {
-        source.pause();
-      }
-    }
-  }
-
-  source.on('data', ondata);
-
-  function ondrain() {
-    if (source.readable && source.resume) {
-      source.resume();
-    }
-  }
-
-  dest.on('drain', ondrain);
-
-  // If the 'end' option is not supplied, dest.end() will be called when
-  // source gets the 'end' or 'close' events.  Only dest.end() once.
-  if (!dest._isStdio && (!options || options.end !== false)) {
-    source.on('end', onend);
-    source.on('close', onclose);
-  }
-
-  var didOnEnd = false;
-  function onend() {
-    if (didOnEnd) return;
-    didOnEnd = true;
-
-    dest.end();
-  }
-
-
-  function onclose() {
-    if (didOnEnd) return;
-    didOnEnd = true;
-
-    if (typeof dest.destroy === 'function') dest.destroy();
-  }
-
-  // don't leave dangling pipes when there are errors.
-  function onerror(er) {
-    cleanup();
-    if (EE.listenerCount(this, 'error') === 0) {
-      throw er; // Unhandled stream error in pipe.
-    }
-  }
-
-  source.on('error', onerror);
-  dest.on('error', onerror);
-
-  // remove all the event listeners that were added.
-  function cleanup() {
-    source.removeListener('data', ondata);
-    dest.removeListener('drain', ondrain);
-
-    source.removeListener('end', onend);
-    source.removeListener('close', onclose);
-
-    source.removeListener('error', onerror);
-    dest.removeListener('error', onerror);
-
-    source.removeListener('end', cleanup);
-    source.removeListener('close', cleanup);
-
-    dest.removeListener('close', cleanup);
-  }
-
-  source.on('end', cleanup);
-  source.on('close', cleanup);
-
-  dest.on('close', cleanup);
-
-  dest.emit('pipe', source);
-
-  // Allow for unix-like usage: A.pipe(B).pipe(C)
-  return dest;
-};
-
-},{"events":6,"inherits":8,"readable-stream/duplex.js":13,"readable-stream/passthrough.js":24,"readable-stream/readable.js":25,"readable-stream/transform.js":26,"readable-stream/writable.js":27}],29:[function(require,module,exports){
-(function (setImmediate,clearImmediate){
-var nextTick = require('process/browser.js').nextTick;
-var apply = Function.prototype.apply;
-var slice = Array.prototype.slice;
-var immediateIds = {};
-var nextImmediateId = 0;
-
-// DOM APIs, for completeness
-
-exports.setTimeout = function() {
-  return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
-};
-exports.setInterval = function() {
-  return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
-};
-exports.clearTimeout =
-exports.clearInterval = function(timeout) { timeout.close(); };
-
-function Timeout(id, clearFn) {
-  this._id = id;
-  this._clearFn = clearFn;
-}
-Timeout.prototype.unref = Timeout.prototype.ref = function() {};
-Timeout.prototype.close = function() {
-  this._clearFn.call(window, this._id);
-};
-
-// Does not start the time, just sets up the members needed.
-exports.enroll = function(item, msecs) {
-  clearTimeout(item._idleTimeoutId);
-  item._idleTimeout = msecs;
-};
-
-exports.unenroll = function(item) {
-  clearTimeout(item._idleTimeoutId);
-  item._idleTimeout = -1;
-};
-
-exports._unrefActive = exports.active = function(item) {
-  clearTimeout(item._idleTimeoutId);
-
-  var msecs = item._idleTimeout;
-  if (msecs >= 0) {
-    item._idleTimeoutId = setTimeout(function onTimeout() {
-      if (item._onTimeout)
-        item._onTimeout();
-    }, msecs);
-  }
-};
-
-// That's not how node.js implements it but the exposed api is the same.
-exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
-  var id = nextImmediateId++;
-  var args = arguments.length < 2 ? false : slice.call(arguments, 1);
-
-  immediateIds[id] = true;
-
-  nextTick(function onNextTick() {
-    if (immediateIds[id]) {
-      // fn.call() is faster so we optimize for the common use-case
-      // @see http://jsperf.com/call-apply-segu
-      if (args) {
-        fn.apply(null, args);
-      } else {
-        fn.call(null);
-      }
-      // Prevent ids from leaking
-      exports.clearImmediate(id);
-    }
-  });
-
-  return id;
-};
-
-exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) {
-  delete immediateIds[id];
-};
-}).call(this,require("timers").setImmediate,require("timers").clearImmediate)
-},{"process/browser.js":12,"timers":29}],30:[function(require,module,exports){
-(function (global){
-
-/**
- * Module exports.
- */
-
-module.exports = deprecate;
-
-/**
- * Mark that a method should not be used.
- * Returns a modified function which warns once by default.
- *
- * If `localStorage.noDeprecation = true` is set, then it is a no-op.
- *
- * If `localStorage.throwDeprecation = true` is set, then deprecated functions
- * will throw an Error when invoked.
- *
- * If `localStorage.traceDeprecation = true` is set, then deprecated functions
- * will invoke `console.trace()` instead of `console.error()`.
- *
- * @param {Function} fn - the function to deprecate
- * @param {String} msg - the string to print to the console when `fn` is invoked
- * @returns {Function} a new "deprecated" version of `fn`
- * @api public
- */
-
-function deprecate (fn, msg) {
-  if (config('noDeprecation')) {
-    return fn;
-  }
-
-  var warned = false;
-  function deprecated() {
-    if (!warned) {
-      if (config('throwDeprecation')) {
-        throw new Error(msg);
-      } else if (config('traceDeprecation')) {
-        console.trace(msg);
-      } else {
-        console.warn(msg);
-      }
-      warned = true;
-    }
-    return fn.apply(this, arguments);
-  }
-
-  return deprecated;
-}
-
-/**
- * Checks `localStorage` for boolean values for the given `name`.
- *
- * @param {String} name
- * @returns {Boolean}
- * @api private
- */
-
-function config (name) {
-  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
-  try {
-    if (!global.localStorage) return false;
-  } catch (_) {
-    return false;
-  }
-  var val = global.localStorage[name];
-  if (null == val) return false;
-  return String(val).toLowerCase() === 'true';
-}
-
-}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{}],31:[function(require,module,exports){
-if (typeof Object.create === 'function') {
-  // implementation from standard node.js 'util' module
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    ctor.prototype = Object.create(superCtor.prototype, {
-      constructor: {
-        value: ctor,
-        enumerable: false,
-        writable: true,
-        configurable: true
-      }
-    });
-  };
-} else {
-  // old school shim for old browsers
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    var TempCtor = function () {}
-    TempCtor.prototype = superCtor.prototype
-    ctor.prototype = new TempCtor()
-    ctor.prototype.constructor = ctor
-  }
-}
-
-},{}],32:[function(require,module,exports){
-module.exports = function isBuffer(arg) {
-  return arg && typeof arg === 'object'
-    && typeof arg.copy === 'function'
-    && typeof arg.fill === 'function'
-    && typeof arg.readUInt8 === 'function';
-}
-},{}],33:[function(require,module,exports){
-(function (process,global){
-// Copyright Joyent, Inc. and other Node contributors.
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to permit
-// persons to whom the Software is furnished to do so, subject to the
-// following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
-// USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-var formatRegExp = /%[sdj%]/g;
-exports.format = function(f) {
-  if (!isString(f)) {
-    var objects = [];
-    for (var i = 0; i < arguments.length; i++) {
-      objects.push(inspect(arguments[i]));
-    }
-    return objects.join(' ');
-  }
-
-  var i = 1;
-  var args = arguments;
-  var len = args.length;
-  var str = String(f).replace(formatRegExp, function(x) {
-    if (x === '%%') return '%';
-    if (i >= len) return x;
-    switch (x) {
-      case '%s': return String(args[i++]);
-      case '%d': return Number(args[i++]);
-      case '%j':
-        try {
-          return JSON.stringify(args[i++]);
-        } catch (_) {
-          return '[Circular]';
-        }
-      default:
-        return x;
-    }
-  });
-  for (var x = args[i]; i < len; x = args[++i]) {
-    if (isNull(x) || !isObject(x)) {
-      str += ' ' + x;
-    } else {
-      str += ' ' + inspect(x);
-    }
-  }
-  return str;
-};
-
-
-// Mark that a method should not be used.
-// Returns a modified function which warns once by default.
-// If --no-deprecation is set, then it is a no-op.
-exports.deprecate = function(fn, msg) {
-  // Allow for deprecating things in the process of starting up.
-  if (isUndefined(global.process)) {
-    return function() {
-      return exports.deprecate(fn, msg).apply(this, arguments);
-    };
-  }
-
-  if (process.noDeprecation === true) {
-    return fn;
-  }
-
-  var warned = false;
-  function deprecated() {
-    if (!warned) {
-      if (process.throwDeprecation) {
-        throw new Error(msg);
-      } else if (process.traceDeprecation) {
-        console.trace(msg);
-      } else {
-        console.error(msg);
-      }
-      warned = true;
-    }
-    return fn.apply(this, arguments);
-  }
-
-  return deprecated;
-};
-
-
-var debugs = {};
-var debugEnviron;
-exports.debuglog = function(set) {
-  if (isUndefined(debugEnviron))
-    debugEnviron = process.env.NODE_DEBUG || '';
-  set = set.toUpperCase();
-  if (!debugs[set]) {
-    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
-      var pid = process.pid;
-      debugs[set] = function() {
-        var msg = exports.format.apply(exports, arguments);
-        console.error('%s %d: %s', set, pid, msg);
-      };
-    } else {
-      debugs[set] = function() {};
-    }
-  }
-  return debugs[set];
-};
-
-
-/**
- * Echos the value of a value. Trys to print the value out
- * in the best way possible given the different types.
- *
- * @param {Object} obj The object to print out.
- * @param {Object} opts Optional options object that alters the output.
- */
-/* legacy: obj, showHidden, depth, colors*/
-function inspect(obj, opts) {
-  // default options
-  var ctx = {
-    seen: [],
-    stylize: stylizeNoColor
-  };
-  // legacy...
-  if (arguments.length >= 3) ctx.depth = arguments[2];
-  if (arguments.length >= 4) ctx.colors = arguments[3];
-  if (isBoolean(opts)) {
-    // legacy...
-    ctx.showHidden = opts;
-  } else if (opts) {
-    // got an "options" object
-    exports._extend(ctx, opts);
-  }
-  // set default options
-  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
-  if (isUndefined(ctx.depth)) ctx.depth = 2;
-  if (isUndefined(ctx.colors)) ctx.colors = false;
-  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
-  if (ctx.colors) ctx.stylize = stylizeWithColor;
-  return formatValue(ctx, obj, ctx.depth);
-}
-exports.inspect = inspect;
-
-
-// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
-inspect.colors = {
-  'bold' : [1, 22],
-  'italic' : [3, 23],
-  'underline' : [4, 24],
-  'inverse' : [7, 27],
-  'white' : [37, 39],
-  'grey' : [90, 39],
-  'black' : [30, 39],
-  'blue' : [34, 39],
-  'cyan' : [36, 39],
-  'green' : [32, 39],
-  'magenta' : [35, 39],
-  'red' : [31, 39],
-  'yellow' : [33, 39]
-};
-
-// Don't use 'blue' not visible on cmd.exe
-inspect.styles = {
-  'special': 'cyan',
-  'number': 'yellow',
-  'boolean': 'yellow',
-  'undefined': 'grey',
-  'null': 'bold',
-  'string': 'green',
-  'date': 'magenta',
-  // "name": intentionally not styling
-  'regexp': 'red'
-};
-
-
-function stylizeWithColor(str, styleType) {
-  var style = inspect.styles[styleType];
-
-  if (style) {
-    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
-           '\u001b[' + inspect.colors[style][1] + 'm';
-  } else {
-    return str;
-  }
-}
-
-
-function stylizeNoColor(str, styleType) {
-  return str;
-}
-
-
-function arrayToHash(array) {
-  var hash = {};
-
-  array.forEach(function(val, idx) {
-    hash[val] = true;
-  });
-
-  return hash;
-}
-
-
-function formatValue(ctx, value, recurseTimes) {
-  // Provide a hook for user-specified inspect functions.
-  // Check that value is an object with an inspect function on it
-  if (ctx.customInspect &&
-      value &&
-      isFunction(value.inspect) &&
-      // Filter out the util module, it's inspect function is special
-      value.inspect !== exports.inspect &&
-      // Also filter out any prototype objects using the circular check.
-      !(value.constructor && value.constructor.prototype === value)) {
-    var ret = value.inspect(recurseTimes, ctx);
-    if (!isString(ret)) {
-      ret = formatValue(ctx, ret, recurseTimes);
-    }
-    return ret;
-  }
-
-  // Primitive types cannot have properties
-  var primitive = formatPrimitive(ctx, value);
-  if (primitive) {
-    return primitive;
-  }
-
-  // Look up the keys of the object.
-  var keys = Object.keys(value);
-  var visibleKeys = arrayToHash(keys);
-
-  if (ctx.showHidden) {
-    keys = Object.getOwnPropertyNames(value);
-  }
-
-  // IE doesn't make error fields non-enumerable
-  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
-  if (isError(value)
-      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
-    return formatError(value);
-  }
-
-  // Some type of object without properties can be shortcutted.
-  if (keys.length === 0) {
-    if (isFunction(value)) {
-      var name = value.name ? ': ' + value.name : '';
-      return ctx.stylize('[Function' + name + ']', 'special');
-    }
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    }
-    if (isDate(value)) {
-      return ctx.stylize(Date.prototype.toString.call(value), 'date');
-    }
-    if (isError(value)) {
-      return formatError(value);
-    }
-  }
-
-  var base = '', array = false, braces = ['{', '}'];
-
-  // Make Array say that they are Array
-  if (isArray(value)) {
-    array = true;
-    braces = ['[', ']'];
-  }
-
-  // Make functions say that they are functions
-  if (isFunction(value)) {
-    var n = value.name ? ': ' + value.name : '';
-    base = ' [Function' + n + ']';
-  }
-
-  // Make RegExps say that they are RegExps
-  if (isRegExp(value)) {
-    base = ' ' + RegExp.prototype.toString.call(value);
-  }
-
-  // Make dates with properties first say the date
-  if (isDate(value)) {
-    base = ' ' + Date.prototype.toUTCString.call(value);
-  }
-
-  // Make error with message first say the error
-  if (isError(value)) {
-    base = ' ' + formatError(value);
-  }
-
-  if (keys.length === 0 && (!array || value.length == 0)) {
-    return braces[0] + base + braces[1];
-  }
-
-  if (recurseTimes < 0) {
-    if (isRegExp(value)) {
-      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
-    } else {
-      return ctx.stylize('[Object]', 'special');
-    }
-  }
-
-  ctx.seen.push(value);
-
-  var output;
-  if (array) {
-    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
-  } else {
-    output = keys.map(function(key) {
-      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
-    });
-  }
-
-  ctx.seen.pop();
-
-  return reduceToSingleString(output, base, braces);
-}
-
-
-function formatPrimitive(ctx, value) {
-  if (isUndefined(value))
-    return ctx.stylize('undefined', 'undefined');
-  if (isString(value)) {
-    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
-                                             .replace(/'/g, "\\'")
-                                             .replace(/\\"/g, '"') + '\'';
-    return ctx.stylize(simple, 'string');
-  }
-  if (isNumber(value))
-    return ctx.stylize('' + value, 'number');
-  if (isBoolean(value))
-    return ctx.stylize('' + value, 'boolean');
-  // For some reason typeof null is "object", so special case here.
-  if (isNull(value))
-    return ctx.stylize('null', 'null');
-}
-
-
-function formatError(value) {
-  return '[' + Error.prototype.toString.call(value) + ']';
-}
-
-
-function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
-  var output = [];
-  for (var i = 0, l = value.length; i < l; ++i) {
-    if (hasOwnProperty(value, String(i))) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          String(i), true));
-    } else {
-      output.push('');
-    }
-  }
-  keys.forEach(function(key) {
-    if (!key.match(/^\d+$/)) {
-      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
-          key, true));
-    }
-  });
-  return output;
-}
-
-
-function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
-  var name, str, desc;
-  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
-  if (desc.get) {
-    if (desc.set) {
-      str = ctx.stylize('[Getter/Setter]', 'special');
-    } else {
-      str = ctx.stylize('[Getter]', 'special');
-    }
-  } else {
-    if (desc.set) {
-      str = ctx.stylize('[Setter]', 'special');
-    }
-  }
-  if (!hasOwnProperty(visibleKeys, key)) {
-    name = '[' + key + ']';
-  }
-  if (!str) {
-    if (ctx.seen.indexOf(desc.value) < 0) {
-      if (isNull(recurseTimes)) {
-        str = formatValue(ctx, desc.value, null);
-      } else {
-        str = formatValue(ctx, desc.value, recurseTimes - 1);
-      }
-      if (str.indexOf('\n') > -1) {
-        if (array) {
-          str = str.split('\n').map(function(line) {
-            return '  ' + line;
-          }).join('\n').substr(2);
-        } else {
-          str = '\n' + str.split('\n').map(function(line) {
-            return '   ' + line;
-          }).join('\n');
-        }
-      }
-    } else {
-      str = ctx.stylize('[Circular]', 'special');
-    }
-  }
-  if (isUndefined(name)) {
-    if (array && key.match(/^\d+$/)) {
-      return str;
-    }
-    name = JSON.stringify('' + key);
-    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
-      name = name.substr(1, name.length - 2);
-      name = ctx.stylize(name, 'name');
-    } else {
-      name = name.replace(/'/g, "\\'")
-                 .replace(/\\"/g, '"')
-                 .replace(/(^"|"$)/g, "'");
-      name = ctx.stylize(name, 'string');
-    }
-  }
-
-  return name + ': ' + str;
-}
-
-
-function reduceToSingleString(output, base, braces) {
-  var numLinesEst = 0;
-  var length = output.reduce(function(prev, cur) {
-    numLinesEst++;
-    if (cur.indexOf('\n') >= 0) numLinesEst++;
-    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
-  }, 0);
-
-  if (length > 60) {
-    return braces[0] +
-           (base === '' ? '' : base + '\n ') +
-           ' ' +
-           output.join(',\n  ') +
-           ' ' +
-           braces[1];
-  }
-
-  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
-}
-
-
-// NOTE: These type checking functions intentionally don't use `instanceof`
-// because it is fragile and can be easily faked with `Object.create()`.
-function isArray(ar) {
-  return Array.isArray(ar);
-}
-exports.isArray = isArray;
-
-function isBoolean(arg) {
-  return typeof arg === 'boolean';
-}
-exports.isBoolean = isBoolean;
-
-function isNull(arg) {
-  return arg === null;
-}
-exports.isNull = isNull;
-
-function isNullOrUndefined(arg) {
-  return arg == null;
-}
-exports.isNullOrUndefined = isNullOrUndefined;
-
-function isNumber(arg) {
-  return typeof arg === 'number';
-}
-exports.isNumber = isNumber;
-
-function isString(arg) {
-  return typeof arg === 'string';
-}
-exports.isString = isString;
-
-function isSymbol(arg) {
-  return typeof arg === 'symbol';
-}
-exports.isSymbol = isSymbol;
-
-function isUndefined(arg) {
-  return arg === void 0;
-}
-exports.isUndefined = isUndefined;
-
-function isRegExp(re) {
-  return isObject(re) && objectToString(re) === '[object RegExp]';
-}
-exports.isRegExp = isRegExp;
-
-function isObject(arg) {
-  return typeof arg === 'object' && arg !== null;
-}
-exports.isObject = isObject;
-
-function isDate(d) {
-  return isObject(d) && objectToString(d) === '[object Date]';
-}
-exports.isDate = isDate;
-
-function isError(e) {
-  return isObject(e) &&
-      (objectToString(e) === '[object Error]' || e instanceof Error);
-}
-exports.isError = isError;
-
-function isFunction(arg) {
-  return typeof arg === 'function';
-}
-exports.isFunction = isFunction;
-
-function isPrimitive(arg) {
-  return arg === null ||
-         typeof arg === 'boolean' ||
-         typeof arg === 'number' ||
-         typeof arg === 'string' ||
-         typeof arg === 'symbol' ||  // ES6 symbol
-         typeof arg === 'undefined';
-}
-exports.isPrimitive = isPrimitive;
-
-exports.isBuffer = require('./support/isBuffer');
-
-function objectToString(o) {
-  return Object.prototype.toString.call(o);
-}
-
-
-function pad(n) {
-  return n < 10 ? '0' + n.toString(10) : n.toString(10);
-}
-
-
-var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
-              'Oct', 'Nov', 'Dec'];
-
-// 26 Feb 16:19:34
-function timestamp() {
-  var d = new Date();
-  var time = [pad(d.getHours()),
-              pad(d.getMinutes()),
-              pad(d.getSeconds())].join(':');
-  return [d.getDate(), months[d.getMonth()], time].join(' ');
-}
-
-
-// log is just a thin wrapper to console.log that prepends a timestamp
-exports.log = function() {
-  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
-};
-
-
-/**
- * Inherit the prototype methods from one constructor into another.
- *
- * The Function.prototype.inherits from lang.js rewritten as a standalone
- * function (not on Function.prototype). NOTE: If this file is to be loaded
- * during bootstrapping this function needs to be rewritten using some native
- * functions as prototype setup using normal JavaScript does not work as
- * expected during bootstrapping (see mirror.js in r114903).
- *
- * @param {function} ctor Constructor function which needs to inherit the
- *     prototype.
- * @param {function} superCtor Constructor function to inherit prototype from.
- */
-exports.inherits = require('inherits');
-
-exports._extend = function(origin, add) {
-  // Don't do anything if add isn't an object
-  if (!add || !isObject(add)) return origin;
-
-  var keys = Object.keys(add);
-  var i = keys.length;
-  while (i--) {
-    origin[keys[i]] = add[keys[i]];
-  }
-  return origin;
-};
-
-function hasOwnProperty(obj, prop) {
-  return Object.prototype.hasOwnProperty.call(obj, prop);
-}
-
-}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"./support/isBuffer":32,"_process":12,"inherits":31}],34:[function(require,module,exports){
-(function (Buffer){
-module.exports = Buffers;
-
-function Buffers (bufs) {
-    if (!(this instanceof Buffers)) return new Buffers(bufs);
-    this.buffers = bufs || [];
-    this.length = this.buffers.reduce(function (size, buf) {
-        return size + buf.length
-    }, 0);
-}
-
-Buffers.prototype.push = function () {
-    for (var i = 0; i < arguments.length; i++) {
-        if (!Buffer.isBuffer(arguments[i])) {
-            throw new TypeError('Tried to push a non-buffer');
-        }
-    }
-    
-    for (var i = 0; i < arguments.length; i++) {
-        var buf = arguments[i];
-        this.buffers.push(buf);
-        this.length += buf.length;
-    }
-    return this.length;
-};
-
-Buffers.prototype.unshift = function () {
-    for (var i = 0; i < arguments.length; i++) {
-        if (!Buffer.isBuffer(arguments[i])) {
-            throw new TypeError('Tried to unshift a non-buffer');
-        }
-    }
-    
-    for (var i = 0; i < arguments.length; i++) {
-        var buf = arguments[i];
-        this.buffers.unshift(buf);
-        this.length += buf.length;
-    }
-    return this.length;
-};
-
-Buffers.prototype.copy = function (dst, dStart, start, end) {
-    return this.slice(start, end).copy(dst, dStart, 0, end - start);
-};
-
-Buffers.prototype.splice = function (i, howMany) {
-    var buffers = this.buffers;
-    var index = i >= 0 ? i : this.length - i;
-    var reps = [].slice.call(arguments, 2);
-    
-    if (howMany === undefined) {
-        howMany = this.length - index;
-    }
-    else if (howMany > this.length - index) {
-        howMany = this.length - index;
-    }
-    
-    for (var i = 0; i < reps.length; i++) {
-        this.length += reps[i].length;
-    }
-    
-    var removed = new Buffers();
-    var bytes = 0;
-    
-    var startBytes = 0;
-    for (
-        var ii = 0;
-        ii < buffers.length && startBytes + buffers[ii].length < index;
-        ii ++
-    ) { startBytes += buffers[ii].length }
-    
-    if (index - startBytes > 0) {
-        var start = index - startBytes;
-        
-        if (start + howMany < buffers[ii].length) {
-            removed.push(buffers[ii].slice(start, start + howMany));
-            
-            var orig = buffers[ii];
-            //var buf = new Buffer(orig.length - howMany);
-            var buf0 = new Buffer(start);
-            for (var i = 0; i < start; i++) {
-                buf0[i] = orig[i];
-            }
-            
-            var buf1 = new Buffer(orig.length - start - howMany);
-            for (var i = start + howMany; i < orig.length; i++) {
-                buf1[ i - howMany - start ] = orig[i]
-            }
-            
-            if (reps.length > 0) {
-                var reps_ = reps.slice();
-                reps_.unshift(buf0);
-                reps_.push(buf1);
-                buffers.splice.apply(buffers, [ ii, 1 ].concat(reps_));
-                ii += reps_.length;
-                reps = [];
-            }
-            else {
-                buffers.splice(ii, 1, buf0, buf1);
-                //buffers[ii] = buf;
-                ii += 2;
-            }
-        }
-        else {
-            removed.push(buffers[ii].slice(start));
-            buffers[ii] = buffers[ii].slice(0, start);
-            ii ++;
-        }
-    }
-    
-    if (reps.length > 0) {
-        buffers.splice.apply(buffers, [ ii, 0 ].concat(reps));
-        ii += reps.length;
-    }
-    
-    while (removed.length < howMany) {
-        var buf = buffers[ii];
-        var len = buf.length;
-        var take = Math.min(len, howMany - removed.length);
-        
-        if (take === len) {
-            removed.push(buf);
-            buffers.splice(ii, 1);
-        }
-        else {
-            removed.push(buf.slice(0, take));
-            buffers[ii] = buffers[ii].slice(take);
-        }
-    }
-    
-    this.length -= removed.length;
-    
-    return removed;
-};
- 
-Buffers.prototype.slice = function (i, j) {
-    var buffers = this.buffers;
-    if (j === undefined) j = this.length;
-    if (i === undefined) i = 0;
-    
-    if (j > this.length) j = this.length;
-    
-    var startBytes = 0;
-    for (
-        var si = 0;
-        si < buffers.length && startBytes + buffers[si].length <= i;
-        si ++
-    ) { startBytes += buffers[si].length }
-    
-    var target = new Buffer(j - i);
-    
-    var ti = 0;
-    for (var ii = si; ti < j - i && ii < buffers.length; ii++) {
-        var len = buffers[ii].length;
-        
-        var start = ti === 0 ? i - startBytes : 0;
-        var end = ti + len >= j - i
-            ? Math.min(start + (j - i) - ti, len)
-            : len
-        ;
-        
-        buffers[ii].copy(target, ti, start, end);
-        ti += end - start;
-    }
-    
-    return target;
-};
-
-Buffers.prototype.pos = function (i) {
-    if (i < 0 || i >= this.length) throw new Error('oob');
-    var l = i, bi = 0, bu = null;
-    for (;;) {
-        bu = this.buffers[bi];
-        if (l < bu.length) {
-            return {buf: bi, offset: l};
-        } else {
-            l -= bu.length;
-        }
-        bi++;
-    }
-};
-
-Buffers.prototype.get = function get (i) {
-    var pos = this.pos(i);
-
-    return this.buffers[pos.buf].get(pos.offset);
-};
-
-Buffers.prototype.set = function set (i, b) {
-    var pos = this.pos(i);
-
-    return this.buffers[pos.buf].set(pos.offset, b);
-};
-
-Buffers.prototype.indexOf = function (needle, offset) {
-    if ("string" === typeof needle) {
-        needle = new Buffer(needle);
-    } else if (needle instanceof Buffer) {
-        // already a buffer
-    } else {
-        throw new Error('Invalid type for a search string');
-    }
-
-    if (!needle.length) {
-        return 0;
-    }
-
-    if (!this.length) {
-        return -1;
-    }
-
-    var i = 0, j = 0, match = 0, mstart, pos = 0;
-
-    // start search from a particular point in the virtual buffer
-    if (offset) {
-        var p = this.pos(offset);
-        i = p.buf;
-        j = p.offset;
-        pos = offset;
-    }
-
-    // for each character in virtual buffer
-    for (;;) {
-        while (j >= this.buffers[i].length) {
-            j = 0;
-            i++;
-
-            if (i >= this.buffers.length) {
-                // search string not found
-                return -1;
-            }
-        }
-
-        var char = this.buffers[i][j];
-
-        if (char == needle[match]) {
-            // keep track where match started
-            if (match == 0) {
-                mstart = {
-                    i: i,
-                    j: j,
-                    pos: pos
-                };
-            }
-            match++;
-            if (match == needle.length) {
-                // full match
-                return mstart.pos;
-            }
-        } else if (match != 0) {
-            // a partial match ended, go back to match starting position
-            // this will continue the search at the next character
-            i = mstart.i;
-            j = mstart.j;
-            pos = mstart.pos;
-            match = 0;
-        }
-
-        j++;
-        pos++;
-    }
-};
-
-Buffers.prototype.toBuffer = function() {
-    return this.slice();
-}
-
-Buffers.prototype.toString = function(encoding, start, end) {
-    return this.slice(start, end).toString(encoding);
-}
-
-}).call(this,require("buffer").Buffer)
-},{"buffer":4}],35:[function(require,module,exports){
-(function (process){
-/**
- * This is the web browser implementation of `debug()`.
- *
- * Expose `debug()` as the module.
- */
-
-exports = module.exports = require('./debug');
-exports.log = log;
-exports.formatArgs = formatArgs;
-exports.save = save;
-exports.load = load;
-exports.useColors = useColors;
-exports.storage = 'undefined' != typeof chrome
-               && 'undefined' != typeof chrome.storage
-                  ? chrome.storage.local
-                  : localstorage();
-
-/**
- * Colors.
- */
-
-exports.colors = [
-  '#0000CC', '#0000FF', '#0033CC', '#0033FF', '#0066CC', '#0066FF', '#0099CC',
-  '#0099FF', '#00CC00', '#00CC33', '#00CC66', '#00CC99', '#00CCCC', '#00CCFF',
-  '#3300CC', '#3300FF', '#3333CC', '#3333FF', '#3366CC', '#3366FF', '#3399CC',
-  '#3399FF', '#33CC00', '#33CC33', '#33CC66', '#33CC99', '#33CCCC', '#33CCFF',
-  '#6600CC', '#6600FF', '#6633CC', '#6633FF', '#66CC00', '#66CC33', '#9900CC',
-  '#9900FF', '#9933CC', '#9933FF', '#99CC00', '#99CC33', '#CC0000', '#CC0033',
-  '#CC0066', '#CC0099', '#CC00CC', '#CC00FF', '#CC3300', '#CC3333', '#CC3366',
-  '#CC3399', '#CC33CC', '#CC33FF', '#CC6600', '#CC6633', '#CC9900', '#CC9933',
-  '#CCCC00', '#CCCC33', '#FF0000', '#FF0033', '#FF0066', '#FF0099', '#FF00CC',
-  '#FF00FF', '#FF3300', '#FF3333', '#FF3366', '#FF3399', '#FF33CC', '#FF33FF',
-  '#FF6600', '#FF6633', '#FF9900', '#FF9933', '#FFCC00', '#FFCC33'
-];
-
-/**
- * Currently only WebKit-based Web Inspectors, Firefox >= v31,
- * and the Firebug extension (any Firefox version) are known
- * to support "%c" CSS customizations.
- *
- * TODO: add a `localStorage` variable to explicitly enable/disable colors
- */
-
-function useColors() {
-  // NB: In an Electron preload script, document will be defined but not fully
-  // initialized. Since we know we're in Chrome, we'll just detect this case
-  // explicitly
-  if (typeof window !== 'undefined' && window.process && window.process.type === 'renderer') {
-    return true;
-  }
-
-  // Internet Explorer and Edge do not support colors.
-  if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) {
-    return false;
-  }
-
-  // is webkit? http://stackoverflow.com/a/16459606/376773
-  // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632
-  return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) ||
-    // is firebug? http://stackoverflow.com/a/398120/376773
-    (typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) ||
-    // is firefox >= v31?
-    // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
-    (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) ||
-    // double check webkit in userAgent just in case we are in a worker
-    (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/));
-}
-
-/**
- * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
- */
-
-exports.formatters.j = function(v) {
-  try {
-    return JSON.stringify(v);
-  } catch (err) {
-    return '[UnexpectedJSONParseError]: ' + err.message;
-  }
-};
-
-
-/**
- * Colorize log arguments if enabled.
- *
- * @api public
- */
-
-function formatArgs(args) {
-  var useColors = this.useColors;
-
-  args[0] = (useColors ? '%c' : '')
-    + this.namespace
-    + (useColors ? ' %c' : ' ')
-    + args[0]
-    + (useColors ? '%c ' : ' ')
-    + '+' + exports.humanize(this.diff);
-
-  if (!useColors) return;
-
-  var c = 'color: ' + this.color;
-  args.splice(1, 0, c, 'color: inherit')
-
-  // the final "%c" is somewhat tricky, because there could be other
-  // arguments passed either before or after the %c, so we need to
-  // figure out the correct index to insert the CSS into
-  var index = 0;
-  var lastC = 0;
-  args[0].replace(/%[a-zA-Z%]/g, function(match) {
-    if ('%%' === match) return;
-    index++;
-    if ('%c' === match) {
-      // we only are interested in the *last* %c
-      // (the user may have provided their own)
-      lastC = index;
-    }
-  });
-
-  args.splice(lastC, 0, c);
-}
-
-/**
- * Invokes `console.log()` when available.
- * No-op when `console.log` is not a "function".
- *
- * @api public
- */
-
-function log() {
-  // this hackery is required for IE8/9, where
-  // the `console.log` function doesn't have 'apply'
-  return 'object' === typeof console
-    && console.log
-    && Function.prototype.apply.call(console.log, console, arguments);
-}
-
-/**
- * Save `namespaces`.
- *
- * @param {String} namespaces
- * @api private
- */
-
-function save(namespaces) {
-  try {
-    if (null == namespaces) {
-      exports.storage.removeItem('debug');
-    } else {
-      exports.storage.debug = namespaces;
-    }
-  } catch(e) {}
-}
-
-/**
- * Load `namespaces`.
- *
- * @return {String} returns the previously persisted debug modes
- * @api private
- */
-
-function load() {
-  var r;
-  try {
-    r = exports.storage.debug;
-  } catch(e) {}
-
-  // If debug isn't set in LS, and we're in Electron, try to load $DEBUG
-  if (!r && typeof process !== 'undefined' && 'env' in process) {
-    r = process.env.DEBUG;
-  }
-
-  return r;
-}
-
-/**
- * Enable namespaces listed in `localStorage.debug` initially.
- */
-
-exports.enable(load());
-
-/**
- * Localstorage attempts to return the localstorage.
- *
- * This is necessary because safari throws
- * when a user disables cookies/localstorage
- * and you attempt to access it.
- *
- * @return {LocalStorage}
- * @api private
- */
-
-function localstorage() {
-  try {
-    return window.localStorage;
-  } catch (e) {}
-}
-
-}).call(this,require('_process'))
-},{"./debug":36,"_process":12}],36:[function(require,module,exports){
-
-/**
- * This is the common logic for both the Node.js and web browser
- * implementations of `debug()`.
- *
- * Expose `debug()` as the module.
- */
-
-exports = module.exports = createDebug.debug = createDebug['default'] = createDebug;
-exports.coerce = coerce;
-exports.disable = disable;
-exports.enable = enable;
-exports.enabled = enabled;
-exports.humanize = require('ms');
-
-/**
- * Active `debug` instances.
- */
-exports.instances = [];
-
-/**
- * The currently active debug mode names, and names to skip.
- */
-
-exports.names = [];
-exports.skips = [];
-
-/**
- * Map of special "%n" handling functions, for the debug "format" argument.
- *
- * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N".
- */
-
-exports.formatters = {};
-
-/**
- * Select a color.
- * @param {String} namespace
- * @return {Number}
- * @api private
- */
-
-function selectColor(namespace) {
-  var hash = 0, i;
-
-  for (i in namespace) {
-    hash  = ((hash << 5) - hash) + namespace.charCodeAt(i);
-    hash |= 0; // Convert to 32bit integer
-  }
-
-  return exports.colors[Math.abs(hash) % exports.colors.length];
-}
-
-/**
- * Create a debugger with the given `namespace`.
- *
- * @param {String} namespace
- * @return {Function}
- * @api public
- */
-
-function createDebug(namespace) {
-
-  var prevTime;
-
-  function debug() {
-    // disabled?
-    if (!debug.enabled) return;
-
-    var self = debug;
-
-    // set `diff` timestamp
-    var curr = +new Date();
-    var ms = curr - (prevTime || curr);
-    self.diff = ms;
-    self.prev = prevTime;
-    self.curr = curr;
-    prevTime = curr;
-
-    // turn the `arguments` into a proper Array
-    var args = new Array(arguments.length);
-    for (var i = 0; i < args.length; i++) {
-      args[i] = arguments[i];
-    }
-
-    args[0] = exports.coerce(args[0]);
-
-    if ('string' !== typeof args[0]) {
-      // anything else let's inspect with %O
-      args.unshift('%O');
-    }
-
-    // apply any `formatters` transformations
-    var index = 0;
-    args[0] = args[0].replace(/%([a-zA-Z%])/g, function(match, format) {
-      // if we encounter an escaped % then don't increase the array index
-      if (match === '%%') return match;
-      index++;
-      var formatter = exports.formatters[format];
-      if ('function' === typeof formatter) {
-        var val = args[index];
-        match = formatter.call(self, val);
-
-        // now we need to remove `args[index]` since it's inlined in the `format`
-        args.splice(index, 1);
-        index--;
-      }
-      return match;
-    });
-
-    // apply env-specific formatting (colors, etc.)
-    exports.formatArgs.call(self, args);
-
-    var logFn = debug.log || exports.log || console.log.bind(console);
-    logFn.apply(self, args);
-  }
-
-  debug.namespace = namespace;
-  debug.enabled = exports.enabled(namespace);
-  debug.useColors = exports.useColors();
-  debug.color = selectColor(namespace);
-  debug.destroy = destroy;
-
-  // env-specific initialization logic for debug instances
-  if ('function' === typeof exports.init) {
-    exports.init(debug);
-  }
-
-  exports.instances.push(debug);
-
-  return debug;
-}
-
-function destroy () {
-  var index = exports.instances.indexOf(this);
-  if (index !== -1) {
-    exports.instances.splice(index, 1);
-    return true;
-  } else {
-    return false;
-  }
-}
-
-/**
- * Enables a debug mode by namespaces. This can include modes
- * separated by a colon and wildcards.
- *
- * @param {String} namespaces
- * @api public
- */
-
-function enable(namespaces) {
-  exports.save(namespaces);
-
-  exports.names = [];
-  exports.skips = [];
-
-  var i;
-  var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);
-  var len = split.length;
-
-  for (i = 0; i < len; i++) {
-    if (!split[i]) continue; // ignore empty strings
-    namespaces = split[i].replace(/\*/g, '.*?');
-    if (namespaces[0] === '-') {
-      exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));
-    } else {
-      exports.names.push(new RegExp('^' + namespaces + '$'));
-    }
-  }
-
-  for (i = 0; i < exports.instances.length; i++) {
-    var instance = exports.instances[i];
-    instance.enabled = exports.enabled(instance.namespace);
-  }
-}
-
-/**
- * Disable debug output.
- *
- * @api public
- */
-
-function disable() {
-  exports.enable('');
-}
-
-/**
- * Returns true if the given mode name is enabled, false otherwise.
- *
- * @param {String} name
- * @return {Boolean}
- * @api public
- */
-
-function enabled(name) {
-  if (name[name.length - 1] === '*') {
-    return true;
-  }
-  var i, len;
-  for (i = 0, len = exports.skips.length; i < len; i++) {
-    if (exports.skips[i].test(name)) {
-      return false;
-    }
-  }
-  for (i = 0, len = exports.names.length; i < len; i++) {
-    if (exports.names[i].test(name)) {
-      return true;
-    }
-  }
-  return false;
-}
-
-/**
- * Coerce `val`.
- *
- * @param {Mixed} val
- * @return {Mixed}
- * @api private
- */
-
-function coerce(val) {
-  if (val instanceof Error) return val.stack || val.message;
-  return val;
-}
-
-},{"ms":48}],37:[function(require,module,exports){
-var BufferReader = require('./lib/buffer-reader')
-
-var XIPH_LACING = 1
-var EBML_LACING = 3
-var FIXED_SIZE_LACING = 2
-
-module.exports = function (buffer) {
-  var block = {}
-  var reader = new BufferReader(buffer)
-
-  block.trackNumber = reader.nextUIntV()
-  block.timecode = reader.nextInt16BE()
-
-  var flags = reader.nextUInt8()
-
-  block.invisible = !!(flags & 0x8)
-
-  // only valid for SimpleBlock
-  block.keyframe = !!(flags & 0x80)
-  block.discardable = !!(flags & 0x1)
-
-  var lacing = (flags & 0x6) >> 1
-
-  block.frames = readLacedData(reader, lacing)
-
-  return block
-}
-
-function readLacedData (reader, lacing) {
-  if (!lacing) return [reader.nextBuffer()]
-
-  var i, frameSize
-  var frames = []
-  var framesNum = reader.nextUInt8() + 1 // number of frames
-
-  if (lacing === FIXED_SIZE_LACING) {
-    // remaining data should be divisible by the number of frames
-    if (reader.length % framesNum !== 0) throw new Error('Fixed-Size Lacing Error')
-
-    frameSize = reader.length / framesNum
-    for (i = 0; i < framesNum; i++) {
-      frames.push(reader.nextBuffer(frameSize))
-    }
-    return frames
-  }
-
-  var frameSizes = []
-
-  if (lacing === XIPH_LACING) {
-    for (i = 0; i < framesNum - 1; i++) {
-      var val
-      frameSize = 0
-      do {
-        val = reader.nextUInt8()
-        frameSize += val
-      } while (val === 0xff)
-      frameSizes.push(frameSize)
-    }
-  } else if (lacing === EBML_LACING) {
-    // first frame
-    frameSize = reader.nextUIntV()
-    frameSizes.push(frameSize)
-
-    // middle frames
-    for (i = 1; i < framesNum - 1; i++) {
-      frameSize += reader.nextIntV()
-      frameSizes.push(frameSize)
-    }
-  }
-
-  for (i = 0; i < framesNum - 1; i++) {
-    frames.push(reader.nextBuffer(frameSizes[i]))
-  }
-
-  // last frame (remaining buffer)
-  frames.push(reader.nextBuffer())
-
-  return frames
-}
-
-},{"./lib/buffer-reader":38}],38:[function(require,module,exports){
-var vint = require('./vint')
-
-function BufferReader (buffer) {
-  this.buffer = buffer
-  this.offset = 0
-}
-
-// a super limited subset of the node buffer API
-BufferReader.prototype.nextInt16BE = function () {
-  var value = this.buffer.readInt16BE(this.offset)
-  this.offset += 2
-  return value
-}
-
-BufferReader.prototype.nextUInt8 = function () {
-  var value = this.buffer.readUInt8(this.offset)
-  this.offset += 1
-  return value
-}
-
-// EBML variable sized integers
-BufferReader.prototype.nextUIntV = function () {
-  var v = vint(this.buffer, this.offset)
-  this.offset += v.length
-  return v.value
-}
-
-BufferReader.prototype.nextIntV = function () {
-  var v = vint(this.buffer, this.offset, true)
-  this.offset += v.length
-  return v.value
-}
-
-// buffer slice
-BufferReader.prototype.nextBuffer = function (length) {
-  var buffer = length
-    ? this.buffer.slice(this.offset, this.offset + length)
-    : this.buffer.slice(this.offset)
-  this.offset += length || this.length
-  return buffer
-}
-
-// remaining bytes to read
-Object.defineProperty(BufferReader.prototype, 'length', {
-  get: function () { return this.buffer.length - this.offset }
-})
-
-module.exports = BufferReader
-
-},{"./vint":39}],39:[function(require,module,exports){
-// https://github.com/themasch/node-ebml/blob/master/lib/ebml/tools.js
-module.exports = function (buffer, start, signed) {
-  start = start || 0
-  for (var length = 1; length <= 8; length++) {
-    if (buffer[start] >= Math.pow(2, 8 - length)) {
-      break
-    }
-  }
-  if (length > 8) {
-    throw new Error('Unrepresentable length: ' + length + ' ' +
-      buffer.toString('hex', start, start + length))
-  }
-  if (start + length > buffer.length) {
-    return null
-  }
-  var i
-  var value = buffer[start] & (1 << (8 - length)) - 1
-  for (i = 1; i < length; i++) {
-    if (i === 7) {
-      if (value >= Math.pow(2, 53 - 8) && buffer[start + 7] > 0) {
-        return {
-          length: length,
-          value: -1
-        }
-      }
-    }
-    value *= Math.pow(2, 8)
-    value += buffer[start + i]
-  }
-  if (signed) {
-    value -= Math.pow(2, length * 7 - 1) - 1
-  }
-  return {
-    length: length,
-    value: value
-  }
-}
-
-},{}],40:[function(require,module,exports){
-const Writable = require('stream').Writable
-const ebml = require('ebml')
-const ebmlBlock = require('ebml-block')
-const readElement = require('./lib/read-element')
-
-// track elements we care about
-const TRACK_ELEMENTS = ['TrackNumber', 'TrackType', 'Language', 'CodecID', 'CodecPrivate']
-const SUBTITLE_TYPES = ['S_TEXT/UTF8', 'S_TEXT/SSA', 'S_TEXT/ASS']
-const ASS_KEYS = ['readOrder', 'layer', 'style', 'name', 'marginL', 'marginR', 'marginV', 'effect', 'text']
-
-class MatroskaSubtitles extends Writable {
-  constructor (prevInstance) {
-    super()
-
-    let currentTrack = null
-    let currentSubtitleBlock = null
-    let currentClusterTimecode = null
-
-    this.decoder = new ebml.Decoder()
-
-    if (prevInstance instanceof MatroskaSubtitles) {
-      prevInstance.end()
-      // copy previous metadata
-      this.subtitleTracks = prevInstance.subtitleTracks
-      this.timecodeScale = prevInstance.timecodeScale
-      this.decoder.on('data', _onClusterData)
-    } else {
-      this.subtitleTracks = new Map()
-      this.timecodeScale = 1
-      this.decoder.on('data', _onMetaData)
-    }
-
-    const self = this
-
-    function _onMetaData (chunk) {
-      // Segment Information
-      if (chunk[1].name === 'TimecodeScale') {
-        self.timecodeScale = readElement(chunk[1]) / 1000000
-      }
-
-      // Tracks
-      if (chunk[0] === 'start' && chunk[1].name === 'TrackEntry') {
-        currentTrack = {}
-      }
-
-      if (currentTrack && chunk[0] === 'tag') {
-        // save info about track currently being scanned
-        if (TRACK_ELEMENTS.includes(chunk[1].name)) {
-          currentTrack[chunk[1].name] = readElement(chunk[1])
-        }
-      }
-
-      if (chunk[0] === 'end' && chunk[1].name === 'TrackEntry') {
-        if (currentTrack.TrackType === 0x11) { // Subtitle Track
-          if (SUBTITLE_TYPES.includes(currentTrack.CodecID)) {
-            const track = {
-              number: currentTrack.TrackNumber,
-              language: currentTrack.Language,
-              type: currentTrack.CodecID.substring(7).toLowerCase()
-            }
-
-            if (currentTrack.CodecPrivate) {
-              // only SSA/ASS
-              track.header = currentTrack.CodecPrivate.toString('utf8')
-            }
-
-            self.subtitleTracks.set(currentTrack.TrackNumber, track)
-          }
-        }
-        currentTrack = null
-      }
-
-      if (chunk[0] === 'end' && chunk[1].name === 'Tracks') {
-        self.decoder.removeListener('data', _onMetaData)
-
-        if (self.subtitleTracks.size <= 0) return self.end()
-
-        self.decoder.on('data', _onClusterData)
-        self.emit('tracks', Array.from(self.subtitleTracks.values()))
-      }
-    }
-
-    function _onClusterData (chunk) {
-      // TODO: assuming this is a Cluster `Timecode`
-      if (chunk[1].name === 'Timecode') {
-        currentClusterTimecode = readElement(chunk[1])
-      }
-
-      if (chunk[1].name === 'Block') {
-        const block = ebmlBlock(chunk[1].data)
-
-        if (self.subtitleTracks.has(block.trackNumber)) {
-          const type = self.subtitleTracks.get(block.trackNumber).type
-
-          let subtitle = {
-            text: block.frames[0].toString('utf8'),
-            time: (block.timecode + currentClusterTimecode) * self.timecodeScale
-          }
-
-          if (type === 'ass' || type === 'ssa') {
-            // extract SSA/ASS keys
-            const values = subtitle.text.split(',')
-            // ignore read-order, and skip layer if ssa
-            let i = type === 'ssa' ? 2 : 1
-            for (; i < 9; i++) {
-              subtitle[ASS_KEYS[i]] = values[i]
-            }
-            // re-append extra text that might have been split
-            for (i = 9; i < values.length; i++) {
-              subtitle.text += ',' + values[i]
-            }
-          }
-
-          currentSubtitleBlock = [subtitle, block.trackNumber]
-        }
-      }
-
-      // TODO: assuming `BlockDuration` exists and always comes after `Block`
-      if (currentSubtitleBlock && chunk[1].name === 'BlockDuration') {
-        currentSubtitleBlock[0].duration = readElement(chunk[1]) * self.timecodeScale
-
-        self.emit('subtitle', ...currentSubtitleBlock)
-
-        currentSubtitleBlock = null
-      }
-    }
-  }
-
-  _write (chunk, _, callback) {
-    this.decoder.write(chunk)
-    callback(null)
-  }
-}
-
-module.exports = MatroskaSubtitles
-
-},{"./lib/read-element":41,"ebml":42,"ebml-block":37,"stream":28}],41:[function(require,module,exports){
-const millennium = Date.UTC(2001, 0)
-
-module.exports = function (tag) {
-  switch (tag.type) {
-    case 's': return tag.data.toString('ascii')
-    case '8': return tag.data.toString('utf8')
-    case 'u': return tag.data.readUIntBE(0, tag.dataSize)
-    case 'i': return tag.data.readIntBE(0, tag.dataSize)
-    case 'f': return tag.dataSize === 4
-      ? tag.data.readFloatBE()
-      : tag.data.readDoubleBE()
-    case 'd': return new Date(millennium + tag.data.readIntBE(0, 8) / 1000000)
-    case 'b': case 'm': default: return tag.data
-  }
-}
-
-},{}],42:[function(require,module,exports){
-module.exports = require('./lib/ebml/index.js');
-
-},{"./lib/ebml/index.js":45}],43:[function(require,module,exports){
-(function (Buffer){
-var Transform = require('stream').Transform,
-    tools = require('./tools.js'),
-    schema = require('./schema.js'),
-    debug = require('debug')('ebml:decoder');
-
-var STATE_TAG = 1,
-    STATE_SIZE = 2,
-    STATE_CONTENT = 3;
-
-
-function EbmlDecoder(options) {
-    options = options || {};
-    options.readableObjectMode = true;
-    Transform.call(this, options);
-
-    this._buffer = null;
-    this._tag_stack = [];
-    this._state = STATE_TAG;
-    this._cursor = 0;
-    this._total = 0;
-    this._schema = schema;
-}
-
-require('util').inherits(EbmlDecoder, Transform);
-
-EbmlDecoder.prototype._transform = function(chunk, enc, done) {
-
-    if (this._buffer === null) {
-        this._buffer = chunk;
-    } else {
-        this._buffer = Buffer.concat([this._buffer, chunk]);
-    }
-
-    while (this._cursor < this._buffer.length) {
-        if (this._state === STATE_TAG && !this.readTag()) {
-            break;
-        }
-        if (this._state === STATE_SIZE && !this.readSize()) {
-            break;
-        }
-        if (this._state === STATE_CONTENT && !this.readContent()) {
-            break;
-        }
-    }
-
-    done();
-};
-
-EbmlDecoder.prototype.getSchemaInfo = function(tagStr) {
-    return this._schema[tagStr] || {
-        "type": "unknown",
-        "name": "unknown"
-    };
-};
-
-EbmlDecoder.prototype.readTag = function() {
-
-    debug('parsing tag');
-
-    if (this._cursor >= this._buffer.length) {
-        debug('waiting for more data');
-        return false;
-    }
-
-    var start = this._total;
-    var tag = tools.readVint(this._buffer, this._cursor);
-
-    if (tag == null) {
-        debug('waiting for more data');
-        return false;
-    }
-
-    var tagStr = this._buffer.toString('hex', this._cursor, this._cursor + tag.length);
-
-    this._cursor += tag.length;
-    this._total += tag.length;
-    this._state = STATE_SIZE;
-
-    var tagObj = {
-        tag: tag.value,
-        tagStr: tagStr,
-        type: this.getSchemaInfo(tagStr).type,
-        name: this.getSchemaInfo(tagStr).name,
-        start: start,
-        end: start + tag.length
-    };
-
-    this._tag_stack.push(tagObj);
-    debug('read tag: ' + tagStr);
-
-    return true;
-};
-
-EbmlDecoder.prototype.readSize = function() {
-
-    var tagObj = this._tag_stack[this._tag_stack.length - 1];
-
-    debug('parsing size for tag: ' + tagObj.tag.toString(16));
-
-    if (this._cursor >= this._buffer.length) {
-        debug('waiting for more data');
-        return false;
-    }
-
-
-    var size = tools.readVint(this._buffer, this._cursor);
-
-    if (size == null) {
-        debug('waiting for more data');
-        return false;
-    }
-
-    this._cursor += size.length;
-    this._total += size.length;
-    this._state = STATE_CONTENT;
-    tagObj.dataSize = size.value;
-
-    // unknown size
-    if (size.value === -1) {
-        tagObj.end = -1;
-    } else {
-        tagObj.end += size.value + size.length;
-    }
-
-    debug('read size: ' + size.value);
-
-    return true;
-};
-
-EbmlDecoder.prototype.readContent = function() {
-
-    var tagObj = this._tag_stack[this._tag_stack.length - 1];
-
-    debug('parsing content for tag: ' + tagObj.tag.toString(16));
-
-    if (tagObj.type === 'm') {
-        debug('content should be tags');
-        this.push(['start', tagObj]);
-        this._state = STATE_TAG;
-        return true;
-    }
-
-    if (this._buffer.length < this._cursor + tagObj.dataSize) {
-        debug('got: ' + this._buffer.length);
-        debug('need: ' + (this._cursor + tagObj.dataSize));
-        debug('waiting for more data');
-        return false;
-    }
-
-    var data = this._buffer.slice(this._cursor, this._cursor + tagObj.dataSize);
-    this._total += tagObj.dataSize;
-    this._state = STATE_TAG;
-    this._buffer = this._buffer.slice(this._cursor + tagObj.dataSize);
-    this._cursor = 0;
-
-    this._tag_stack.pop(); // remove the object from the stack
-
-    tagObj.data = data;
-    this.push(['tag', tagObj]);
-
-    while (this._tag_stack.length > 0) {
-        var topEle = this._tag_stack[this._tag_stack.length - 1];
-        if (this._total < topEle.end) {
-            break;
-        }
-        this.push(['end', topEle]);
-        this._tag_stack.pop();
-    }
-
-    if (debug.enabled) {
-        debug('read data: ' + data.toString('hex'));
-    }
-    return true;
-};
-
-module.exports = EbmlDecoder;
-
-}).call(this,require("buffer").Buffer)
-},{"./schema.js":46,"./tools.js":47,"buffer":4,"debug":35,"stream":28,"util":33}],44:[function(require,module,exports){
-(function (Buffer){
-var Transform = require('stream').Transform,
-    tools = require('./tools.js'),
-    schema = require('./schema.js'),
-    debug = require('debug')('ebml:encoder'),
-    Buffers = require('buffers');
-
-function EbmlEncoder(options) {
-    options = options || {};
-    options.writableObjectMode = true;
-    Transform.call(this, options);
-
-    this._schema = schema;
-    this._buffer = null;
-    this._corked = false;
-
-    this._stack = [];
-}
-
-require('util').inherits(EbmlEncoder, Transform);
-
-EbmlEncoder.prototype._transform = function(chunk, enc, done) {
-    debug('encode ' + chunk[0] + ' ' + chunk[1].name);
-
-    if (chunk[0] === 'start') {
-        this.startTag(chunk[1].name, chunk[1]);
-    } else if (chunk[0] === 'tag') {
-        this.writeTag(chunk[1].name, chunk[1].data);
-    } else if (chunk[0] === 'end') {
-        this.endTag(chunk[1].name);
-    }
-
-    done();
-};
-
-EbmlEncoder.prototype._flush = function(done) {
-    done = done || function() {};
-    if (!this._buffer || this._corked) {
-        debug('no buffer/nothing pending');
-        done();
-        return;
-    }
-
-    debug('writing ' + this._buffer.length + ' bytes');
-
-    var chunk = this._buffer.toBuffer();
-    this._buffer = null;
-    this.push(chunk);
-    done();
-};
-
-EbmlEncoder.prototype._bufferAndFlush = function(buffer) {
-    if (this._buffer) {
-        this._buffer.push(buffer);
-    } else {
-        this._buffer = Buffers([buffer]);
-    }
-    this._flush();
-};
-
-EbmlEncoder.prototype.getSchemaInfo = function(tagName) {
-    var tagStrs = Object.keys(this._schema);
-    for (var i = 0; i < tagStrs.length; i++) {
-        var tagStr = tagStrs[i];
-        if (this._schema[tagStr].name === tagName) {
-            return new Buffer(tagStr, 'hex');
-        }
-    }
-    return null;
-};
-
-EbmlEncoder.prototype.cork = function() {
-    this._corked = true;
-};
-
-EbmlEncoder.prototype.uncork = function() {
-    this._corked = false;
-    this._flush();
-};
-
-EbmlEncoder.prototype._encodeTag = function(tagId, tagData, end) {
-    return Buffers([tagId, end === -1 ? Buffer('01ffffffffffffff', 'hex') : tools.writeVint(tagData.length), tagData]);
-};
-
-EbmlEncoder.prototype.writeTag = function(tagName, tagData) {
-    var tagId = this.getSchemaInfo(tagName);
-    if (!tagId) {
-        throw new Error('No schema entry found for ' + tagName);
-    }
-
-    var data = this._encodeTag(tagId, tagData);
-    if (this._stack.length > 0) {
-        this._stack[this._stack.length - 1].children.push({
-            data: data
-        });
-    } else {
-        this._bufferAndFlush(data.toBuffer());
-    }
-};
-
-EbmlEncoder.prototype.startTag = function(tagName, info) {
-    var tagId = this.getSchemaInfo(tagName);
-    if (!tagId) {
-        throw new Error('No schema entry found for ' + tagName);
-    }
-
-    var tag = {
-        id: tagId,
-        name: tagName,
-        end: info.end,
-        children: []
-    };
-
-    if (this._stack.length > 0) {
-        this._stack[this._stack.length - 1].children.push(tag);
-    }
-    this._stack.push(tag);
-};
-
-EbmlEncoder.prototype.endTag = function() {
-    var tag = this._stack.pop();
-
-    var childTagDataBuffers = tag.children.map(function(child) {
-        return child.data;
-    });
-    tag.data = this._encodeTag(tag.id, Buffers(childTagDataBuffers), tag.end);
-
-    if (this._stack.length < 1) {
-        this._bufferAndFlush(tag.data.toBuffer());
-    }
-};
-
-module.exports = EbmlEncoder;
-
-}).call(this,require("buffer").Buffer)
-},{"./schema.js":46,"./tools.js":47,"buffer":4,"buffers":34,"debug":35,"stream":28,"util":33}],45:[function(require,module,exports){
-module.exports = {
-    tools: require('./tools.js'),
-    schema: require('./schema.js'),
-    Decoder: require('./decoder.js'),
-    Encoder: require('./encoder.js')
-};
-
-},{"./decoder.js":43,"./encoder.js":44,"./schema.js":46,"./tools.js":47}],46:[function(require,module,exports){
-var schema = {
-    "80": {
-        "name": "ChapterDisplay",
-        "level": "4",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "1",
-        "description": "Contains all possible strings to use for the chapter display."
-    },
-    "83": {
-        "name": "TrackType",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "1-254",
-        "description": "A set of track types coded on 8 bits (1: video, 2: audio, 3: complex, 0x10: logo, 0x11: subtitle, 0x12: buttons, 0x20: control)."
-    },
-    "85": {
-        "name": "ChapString",
-        "cppname": "ChapterString",
-        "level": "5",
-        "type": "8",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "1",
-        "description": "Contains the string to use as the chapter atom."
-    },
-    "86": {
-        "name": "CodecID",
-        "level": "3",
-        "type": "s",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "An ID corresponding to the codec, see the codec page for more info."
-    },
-    "88": {
-        "name": "FlagDefault",
-        "cppname": "TrackFlagDefault",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "1",
-        "range": "0-1",
-        "description": "Set if that track (audio, video or subs) SHOULD be active if no language found matches the user preference. (1 bit)"
-    },
-    "89": {
-        "name": "ChapterTrackNumber",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "description": "UID of the Track to apply this chapter too. In the absense of a control track, choosing this chapter will select the listed Tracks and deselect unlisted tracks. Absense of this element indicates that the Chapter should be applied to any currently used Tracks."
-    },
-    "91": {
-        "name": "ChapterTimeStart",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "1",
-        "description": "Timestamp of the start of Chapter (not scaled)."
-    },
-    "92": {
-        "name": "ChapterTimeEnd",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "description": "Timestamp of the end of Chapter (timestamp excluded, not scaled)."
-    },
-    "96": {
-        "name": "CueRefTime",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "2",
-        "webm": "0",
-        "description": "Timestamp of the referenced Block."
-    },
-    "97": {
-        "name": "CueRefCluster",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "webm": "0",
-        "description": "The Position of the Cluster containing the referenced Block."
-    },
-    "98": {
-        "name": "ChapterFlagHidden",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "range": "0-1",
-        "description": "If a chapter is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)"
-    },
-    "4254": {
-        "name": "ContentCompAlgo",
-        "level": "6",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "br": [
-            "",
-            "",
-            "",
-            ""
-        ],
-        "del": [
-            "1 - bzlib,",
-            "2 - lzo1x"
-        ],
-        "description": "The compression algorithm used. Algorithms that have been specified so far are: 0 - zlib,   3 - Header Stripping"
-    },
-    "4255": {
-        "name": "ContentCompSettings",
-        "level": "6",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "Settings that might be needed by the decompressor. For Header Stripping (ContentCompAlgo=3), the bytes that were removed from the beggining of each frames of the track."
-    },
-    "4282": {
-        "name": "DocType",
-        "level": "1",
-        "type": "s",
-        "mandatory": "1",
-        "default": "matroska",
-        "minver": "1",
-        "description": "A string that describes the type of document that follows this EBML header. 'matroska' in our case or 'webm' for webm files."
-    },
-    "4285": {
-        "name": "DocTypeReadVersion",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "1",
-        "minver": "1",
-        "description": "The minimum DocType version an interpreter has to support to read this file."
-    },
-    "4286": {
-        "name": "EBMLVersion",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "1",
-        "minver": "1",
-        "description": "The version of EBML parser used to create the file."
-    },
-    "4287": {
-        "name": "DocTypeVersion",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "1",
-        "minver": "1",
-        "description": "The version of DocType interpreter used to create the file."
-    },
-    "4444": {
-        "name": "SegmentFamily",
-        "level": "2",
-        "type": "b",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "bytesize": "16",
-        "description": "A randomly generated unique ID that all segments related to each other must use (128 bits)."
-    },
-    "4461": {
-        "name": "DateUTC",
-        "level": "2",
-        "type": "d",
-        "minver": "1",
-        "description": "Date of the origin of timestamp (value 0), i.e. production date."
-    },
-    "4484": {
-        "name": "TagDefault",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "1",
-        "range": "0-1",
-        "description": "Indication to know if this is the default/original language to use for the given tag. (1 bit)"
-    },
-    "4485": {
-        "name": "TagBinary",
-        "level": "4",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "The values of the Tag if it is binary. Note that this cannot be used in the same SimpleTag as TagString."
-    },
-    "4487": {
-        "name": "TagString",
-        "level": "4",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "The value of the Tag."
-    },
-    "4489": {
-        "name": "Duration",
-        "level": "2",
-        "type": "f",
-        "minver": "1",
-        "range": "> 0",
-        "description": "Duration of the segment (based on TimecodeScale)."
-    },
-    "4598": {
-        "name": "ChapterFlagEnabled",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "1",
-        "range": "0-1",
-        "description": "Specify wether the chapter is enabled. It can be enabled/disabled by a Control Track. When disabled, the movie should skip all the content between the TimeStart and TimeEnd of this chapter (see flag notes). (1 bit)"
-    },
-    "4660": {
-        "name": "FileMimeType",
-        "level": "3",
-        "type": "s",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "MIME type of the file."
-    },
-    "4661": {
-        "name": "FileUsedStartTime",
-        "level": "3",
-        "type": "u",
-        "divx": "1",
-        "description": "DivX font extension"
-    },
-    "4662": {
-        "name": "FileUsedEndTime",
-        "level": "3",
-        "type": "u",
-        "divx": "1",
-        "description": "DivX font extension"
-    },
-    "4675": {
-        "name": "FileReferral",
-        "level": "3",
-        "type": "b",
-        "webm": "0",
-        "description": "A binary value that a track/codec can refer to when the attachment is needed."
-    },
-    "5031": {
-        "name": "ContentEncodingOrder",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "Tells when this modification was used during encoding/muxing starting with 0 and counting upwards. The decoder/demuxer has to start with the highest order number it finds and work its way down. This value has to be unique over all ContentEncodingOrder elements in the segment."
-    },
-    "5032": {
-        "name": "ContentEncodingScope",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "1",
-        "range": "not 0",
-        "br": [
-            "",
-            "",
-            ""
-        ],
-        "description": "A bit field that describes which elements have been modified in this way. Values (big endian) can be OR'ed. Possible values: 1 - all frame contents, 2 - the track's private data, 4 - the next ContentEncoding (next ContentEncodingOrder. Either the data inside ContentCompression and/or ContentEncryption)"
-    },
-    "5033": {
-        "name": "ContentEncodingType",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "br": [
-            "",
-            ""
-        ],
-        "description": "A value describing what kind of transformation has been done. Possible values: 0 - compression, 1 - encryption"
-    },
-    "5034": {
-        "name": "ContentCompression",
-        "level": "5",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "Settings describing the compression used. Must be present if the value of ContentEncodingType is 0 and absent otherwise. Each block must be decompressable even if no previous block is available in order not to prevent seeking."
-    },
-    "5035": {
-        "name": "ContentEncryption",
-        "level": "5",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "Settings describing the encryption used. Must be present if the value of ContentEncodingType is 1 and absent otherwise."
-    },
-    "5378": {
-        "name": "CueBlockNumber",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "1",
-        "range": "not 0",
-        "description": "Number of the Block in the specified Cluster."
-    },
-    "5654": {
-        "name": "ChapterStringUID",
-        "level": "4",
-        "type": "8",
-        "mandatory": "0",
-        "minver": "3",
-        "webm": "1",
-        "description": "A unique string ID to identify the Chapter. Use for WebVTT cue identifier storage."
-    },
-    "5741": {
-        "name": "WritingApp",
-        "level": "2",
-        "type": "8",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "Writing application (\"mkvmerge-0.3.3\")."
-    },
-    "5854": {
-        "name": "SilentTracks",
-        "cppname": "ClusterSilentTracks",
-        "level": "2",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "The list of tracks that are not used in that part of the stream. It is useful when using overlay tracks on seeking. Then you should decide what track to use."
-    },
-    "6240": {
-        "name": "ContentEncoding",
-        "level": "4",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Settings for one content encoding like compression or encryption."
-    },
-    "6264": {
-        "name": "BitDepth",
-        "cppname": "AudioBitDepth",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "range": "not 0",
-        "description": "Bits per sample, mostly used for PCM."
-    },
-    "6532": {
-        "name": "SignedElement",
-        "level": "3",
-        "type": "b",
-        "multiple": "1",
-        "webm": "0",
-        "description": "An element ID whose data will be used to compute the signature."
-    },
-    "6624": {
-        "name": "TrackTranslate",
-        "level": "3",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The track identification for the given Chapter Codec."
-    },
-    "6911": {
-        "name": "ChapProcessCommand",
-        "cppname": "ChapterProcessCommand",
-        "level": "5",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contains all the commands associated to the Atom."
-    },
-    "6922": {
-        "name": "ChapProcessTime",
-        "cppname": "ChapterProcessTime",
-        "level": "6",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Defines when the process command should be handled (0: during the whole chapter, 1: before starting playback, 2: after playback of the chapter)."
-    },
-    "6924": {
-        "name": "ChapterTranslate",
-        "level": "2",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "A tuple of corresponding ID used by chapter codecs to represent this segment."
-    },
-    "6933": {
-        "name": "ChapProcessData",
-        "cppname": "ChapterProcessData",
-        "level": "6",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contains the command information. The data should be interpreted depending on the ChapProcessCodecID value. For ChapProcessCodecID = 1, the data correspond to the binary DVD cell pre/post commands."
-    },
-    "6944": {
-        "name": "ChapProcess",
-        "cppname": "ChapterProcess",
-        "level": "4",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contains all the commands associated to the Atom."
-    },
-    "6955": {
-        "name": "ChapProcessCodecID",
-        "cppname": "ChapterProcessCodecID",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "Contains the type of the codec used for the processing. A value of 0 means native Matroska processing (to be defined), a value of 1 means the DVD command set is used. More codec IDs can be added later."
-    },
-    "7373": {
-        "name": "Tag",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Element containing elements specific to Tracks/Chapters."
-    },
-    "7384": {
-        "name": "SegmentFilename",
-        "level": "2",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "A filename corresponding to this segment."
-    },
-    "7446": {
-        "name": "AttachmentLink",
-        "cppname": "TrackAttachmentLink",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "description": "The UID of an attachment that is used by this codec."
-    },
-    "258688": {
-        "name": "CodecName",
-        "level": "3",
-        "type": "8",
-        "minver": "1",
-        "description": "A human-readable string specifying the codec."
-    },
-    "18538067": {
-        "name": "Segment",
-        "level": "0",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "This element contains all other top-level (level 1) elements. Typically a Matroska file is composed of 1 segment."
-    },
-    "447a": {
-        "name": "TagLanguage",
-        "level": "4",
-        "type": "s",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "und",
-        "description": "Specifies the language of the tag specified, in the Matroska languages form."
-    },
-    "45a3": {
-        "name": "TagName",
-        "level": "4",
-        "type": "8",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The name of the Tag that is going to be stored."
-    },
-    "67c8": {
-        "name": "SimpleTag",
-        "cppname": "TagSimple",
-        "level": "3",
-        "recursive": "1",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contains general information about the target."
-    },
-    "63c6": {
-        "name": "TagAttachmentUID",
-        "level": "4",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "A unique ID to identify the Attachment(s) the tags belong to. If the value is 0 at this level, the tags apply to all the attachments in the Segment."
-    },
-    "63c4": {
-        "name": "TagChapterUID",
-        "level": "4",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "A unique ID to identify the Chapter(s) the tags belong to. If the value is 0 at this level, the tags apply to all chapters in the Segment."
-    },
-    "63c9": {
-        "name": "TagEditionUID",
-        "level": "4",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "A unique ID to identify the EditionEntry(s) the tags belong to. If the value is 0 at this level, the tags apply to all editions in the Segment."
-    },
-    "63c5": {
-        "name": "TagTrackUID",
-        "level": "4",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "A unique ID to identify the Track(s) the tags belong to. If the value is 0 at this level, the tags apply to all tracks in the Segment."
-    },
-    "63ca": {
-        "name": "TargetType",
-        "cppname": "TagTargetType",
-        "level": "4",
-        "type": "s",
-        "minver": "1",
-        "webm": "0",
-        "strong": "informational",
-        "description": "An  string that can be used to display the logical level of the target like \"ALBUM\", \"TRACK\", \"MOVIE\", \"CHAPTER\", etc (see TargetType)."
-    },
-    "68ca": {
-        "name": "TargetTypeValue",
-        "cppname": "TagTargetTypeValue",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "default": "50",
-        "description": "A number to indicate the logical level of the target (see TargetType)."
-    },
-    "63c0": {
-        "name": "Targets",
-        "cppname": "TagTargets",
-        "level": "3",
-        "type": "m",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contain all UIDs where the specified meta data apply. It is empty to describe everything in the segment."
-    },
-    "1254c367": {
-        "name": "Tags",
-        "level": "1",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Element containing elements specific to Tracks/Chapters. A list of valid tags can be found here."
-    },
-    "450d": {
-        "name": "ChapProcessPrivate",
-        "cppname": "ChapterProcessPrivate",
-        "level": "5",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "Some optional data attached to the ChapProcessCodecID information. For ChapProcessCodecID = 1, it is the \"DVD level\" equivalent."
-    },
-    "437e": {
-        "name": "ChapCountry",
-        "cppname": "ChapterCountry",
-        "level": "5",
-        "type": "s",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The countries corresponding to the string, same 2 octets as in Internet domains."
-    },
-    "437c": {
-        "name": "ChapLanguage",
-        "cppname": "ChapterLanguage",
-        "level": "5",
-        "type": "s",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "1",
-        "default": "eng",
-        "description": "The languages corresponding to the string, in the bibliographic ISO-639-2 form."
-    },
-    "8f": {
-        "name": "ChapterTrack",
-        "level": "4",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "List of tracks on which the chapter applies. If this element is not present, all tracks apply"
-    },
-    "63c3": {
-        "name": "ChapterPhysicalEquiv",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "description": "Specify the physical equivalent of this ChapterAtom like \"DVD\" (60) or \"SIDE\" (50), see complete list of values."
-    },
-    "6ebc": {
-        "name": "ChapterSegmentEditionUID",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "description": "The EditionUID to play from the segment linked in ChapterSegmentUID."
-    },
-    "6e67": {
-        "name": "ChapterSegmentUID",
-        "level": "4",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "range": ">0",
-        "bytesize": "16",
-        "description": "A segment to play in place of this chapter. Edition ChapterSegmentEditionUID should be used for this segment, otherwise no edition is used."
-    },
-    "73c4": {
-        "name": "ChapterUID",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "1",
-        "range": "not 0",
-        "description": "A unique ID to identify the Chapter."
-    },
-    "b6": {
-        "name": "ChapterAtom",
-        "level": "3",
-        "recursive": "1",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "1",
-        "description": "Contains the atom information to use as the chapter atom (apply to all tracks)."
-    },
-    "45dd": {
-        "name": "EditionFlagOrdered",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "range": "0-1",
-        "description": "Specify if the chapters can be defined multiple times and the order to play them is enforced. (1 bit)"
-    },
-    "45db": {
-        "name": "EditionFlagDefault",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "range": "0-1",
-        "description": "If a flag is set (1) the edition should be used as the default one. (1 bit)"
-    },
-    "45bd": {
-        "name": "EditionFlagHidden",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "range": "0-1",
-        "description": "If an edition is hidden (1), it should not be available to the user interface (but still to Control Tracks; see flag notes). (1 bit)"
-    },
-    "45bc": {
-        "name": "EditionUID",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "description": "A unique ID to identify the edition. It's useful for tagging an edition."
-    },
-    "45b9": {
-        "name": "EditionEntry",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "1",
-        "description": "Contains all information about a segment edition."
-    },
-    "1043a770": {
-        "name": "Chapters",
-        "level": "1",
-        "type": "m",
-        "minver": "1",
-        "webm": "1",
-        "description": "A system to define basic menus and partition data. For more detailed information, look at the Chapters Explanation."
-    },
-    "46ae": {
-        "name": "FileUID",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "description": "Unique ID representing the file, as random as possible."
-    },
-    "465c": {
-        "name": "FileData",
-        "level": "3",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The data of the file."
-    },
-    "466e": {
-        "name": "FileName",
-        "level": "3",
-        "type": "8",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Filename of the attached file."
-    },
-    "467e": {
-        "name": "FileDescription",
-        "level": "3",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "A human-friendly name for the attached file."
-    },
-    "61a7": {
-        "name": "AttachedFile",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "An attached file."
-    },
-    "1941a469": {
-        "name": "Attachments",
-        "level": "1",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contain attached files."
-    },
-    "eb": {
-        "name": "CueRefCodecState",
-        "level": "5",
-        "type": "u",
-        "webm": "0",
-        "default": "0",
-        "description": "The position of the Codec State corresponding to this referenced element. 0 means that the data is taken from the initial Track Entry."
-    },
-    "535f": {
-        "name": "CueRefNumber",
-        "level": "5",
-        "type": "u",
-        "webm": "0",
-        "default": "1",
-        "range": "not 0",
-        "description": "Number of the referenced Block of Track X in the specified Cluster."
-    },
-    "db": {
-        "name": "CueReference",
-        "level": "4",
-        "type": "m",
-        "multiple": "1",
-        "minver": "2",
-        "webm": "0",
-        "description": "The Clusters containing the required referenced Blocks."
-    },
-    "ea": {
-        "name": "CueCodecState",
-        "level": "4",
-        "type": "u",
-        "minver": "2",
-        "webm": "0",
-        "default": "0",
-        "description": "The position of the Codec State corresponding to this Cue element. 0 means that the data is taken from the initial Track Entry."
-    },
-    "b2": {
-        "name": "CueDuration",
-        "level": "4",
-        "type": "u",
-        "mandatory": "0",
-        "minver": "4",
-        "webm": "0",
-        "description": "The duration of the block according to the segment time base. If missing the track's DefaultDuration does not apply and no duration information is available in terms of the cues."
-    },
-    "f0": {
-        "name": "CueRelativePosition",
-        "level": "4",
-        "type": "u",
-        "mandatory": "0",
-        "minver": "4",
-        "webm": "0",
-        "description": "The relative position of the referenced block inside the cluster with 0 being the first possible position for an element inside that cluster."
-    },
-    "f1": {
-        "name": "CueClusterPosition",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "The position of the Cluster containing the required Block."
-    },
-    "f7": {
-        "name": "CueTrack",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "not 0",
-        "description": "The track for which a position is given."
-    },
-    "b7": {
-        "name": "CueTrackPositions",
-        "level": "3",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Contain positions for different tracks corresponding to the timestamp."
-    },
-    "b3": {
-        "name": "CueTime",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "Absolute timestamp according to the segment time base."
-    },
-    "bb": {
-        "name": "CuePoint",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Contains all information relative to a seek point in the segment."
-    },
-    "1c53bb6b": {
-        "name": "Cues",
-        "level": "1",
-        "type": "m",
-        "minver": "1",
-        "description": "A top-level element to speed seeking access. All entries are local to the segment. Should be mandatory for non \"live\" streams."
-    },
-    "47e6": {
-        "name": "ContentSigHashAlgo",
-        "level": "6",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "br": [
-            "",
-            ""
-        ],
-        "description": "The hash algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - SHA1-160 2 - MD5"
-    },
-    "47e5": {
-        "name": "ContentSigAlgo",
-        "level": "6",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "br": "",
-        "description": "The algorithm used for the signature. A value of '0' means that the contents have not been signed but only encrypted. Predefined values: 1 - RSA"
-    },
-    "47e4": {
-        "name": "ContentSigKeyID",
-        "level": "6",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "This is the ID of the private key the data was signed with."
-    },
-    "47e3": {
-        "name": "ContentSignature",
-        "level": "6",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "A cryptographic signature of the contents."
-    },
-    "47e2": {
-        "name": "ContentEncKeyID",
-        "level": "6",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "For public key algorithms this is the ID of the public key the the data was encrypted with."
-    },
-    "47e1": {
-        "name": "ContentEncAlgo",
-        "level": "6",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "br": "",
-        "description": "The encryption algorithm used. The value '0' means that the contents have not been encrypted but only signed. Predefined values: 1 - DES, 2 - 3DES, 3 - Twofish, 4 - Blowfish, 5 - AES"
-    },
-    "6d80": {
-        "name": "ContentEncodings",
-        "level": "3",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "Settings for several content encoding mechanisms like compression or encryption."
-    },
-    "c4": {
-        "name": "TrickMasterTrackSegmentUID",
-        "level": "3",
-        "type": "b",
-        "divx": "1",
-        "bytesize": "16",
-        "description": "DivX trick track extenstions"
-    },
-    "c7": {
-        "name": "TrickMasterTrackUID",
-        "level": "3",
-        "type": "u",
-        "divx": "1",
-        "description": "DivX trick track extenstions"
-    },
-    "c6": {
-        "name": "TrickTrackFlag",
-        "level": "3",
-        "type": "u",
-        "divx": "1",
-        "default": "0",
-        "description": "DivX trick track extenstions"
-    },
-    "c1": {
-        "name": "TrickTrackSegmentUID",
-        "level": "3",
-        "type": "b",
-        "divx": "1",
-        "bytesize": "16",
-        "description": "DivX trick track extenstions"
-    },
-    "c0": {
-        "name": "TrickTrackUID",
-        "level": "3",
-        "type": "u",
-        "divx": "1",
-        "description": "DivX trick track extenstions"
-    },
-    "ed": {
-        "name": "TrackJoinUID",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "3",
-        "webm": "0",
-        "range": "not 0",
-        "description": "The trackUID number of a track whose blocks are used to create this virtual track."
-    },
-    "e9": {
-        "name": "TrackJoinBlocks",
-        "level": "4",
-        "type": "m",
-        "minver": "3",
-        "webm": "0",
-        "description": "Contains the list of all tracks whose Blocks need to be combined to create this virtual track"
-    },
-    "e6": {
-        "name": "TrackPlaneType",
-        "level": "6",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "3",
-        "webm": "0",
-        "description": "The kind of plane this track corresponds to (0: left eye, 1: right eye, 2: background)."
-    },
-    "e5": {
-        "name": "TrackPlaneUID",
-        "level": "6",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "3",
-        "webm": "0",
-        "range": "not 0",
-        "description": "The trackUID number of the track representing the plane."
-    },
-    "e4": {
-        "name": "TrackPlane",
-        "level": "5",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "3",
-        "webm": "0",
-        "description": "Contains a video plane track that need to be combined to create this 3D track"
-    },
-    "e3": {
-        "name": "TrackCombinePlanes",
-        "level": "4",
-        "type": "m",
-        "minver": "3",
-        "webm": "0",
-        "description": "Contains the list of all video plane tracks that need to be combined to create this 3D track"
-    },
-    "e2": {
-        "name": "TrackOperation",
-        "level": "3",
-        "type": "m",
-        "minver": "3",
-        "webm": "0",
-        "description": "Operation that needs to be applied on tracks to create this virtual track. For more details look at the Specification Notes on the subject."
-    },
-    "7d7b": {
-        "name": "ChannelPositions",
-        "cppname": "AudioPosition",
-        "level": "4",
-        "type": "b",
-        "webm": "0",
-        "description": "Table of horizontal angles for each successive channel, see appendix."
-    },
-    "9f": {
-        "name": "Channels",
-        "cppname": "AudioChannels",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "1",
-        "range": "not 0",
-        "description": "Numbers of channels in the track."
-    },
-    "78b5": {
-        "name": "OutputSamplingFrequency",
-        "cppname": "AudioOutputSamplingFreq",
-        "level": "4",
-        "type": "f",
-        "minver": "1",
-        "default": "Sampling Frequency",
-        "range": "> 0",
-        "description": "Real output sampling frequency in Hz (used for SBR techniques)."
-    },
-    "b5": {
-        "name": "SamplingFrequency",
-        "cppname": "AudioSamplingFreq",
-        "level": "4",
-        "type": "f",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "8000.0",
-        "range": "> 0",
-        "description": "Sampling frequency in Hz."
-    },
-    "e1": {
-        "name": "Audio",
-        "cppname": "TrackAudio",
-        "level": "3",
-        "type": "m",
-        "minver": "1",
-        "description": "Audio settings."
-    },
-    "2383e3": {
-        "name": "FrameRate",
-        "cppname": "VideoFrameRate",
-        "level": "4",
-        "type": "f",
-        "range": "> 0",
-        "strong": "Informational",
-        "description": "Number of frames per second.  only."
-    },
-    "2fb523": {
-        "name": "GammaValue",
-        "cppname": "VideoGamma",
-        "level": "4",
-        "type": "f",
-        "webm": "0",
-        "range": "> 0",
-        "description": "Gamma Value."
-    },
-    "2eb524": {
-        "name": "ColourSpace",
-        "cppname": "VideoColourSpace",
-        "level": "4",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "bytesize": "4",
-        "description": "Same value as in AVI (32 bits)."
-    },
-    "54b3": {
-        "name": "AspectRatioType",
-        "cppname": "VideoAspectRatio",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "Specify the possible modifications to the aspect ratio (0: free resizing, 1: keep aspect ratio, 2: fixed)."
-    },
-    "54b2": {
-        "name": "DisplayUnit",
-        "cppname": "VideoDisplayUnit",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "How DisplayWidth & DisplayHeight should be interpreted (0: pixels, 1: centimeters, 2: inches, 3: Display Aspect Ratio)."
-    },
-    "54ba": {
-        "name": "DisplayHeight",
-        "cppname": "VideoDisplayHeight",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "PixelHeight",
-        "range": "not 0",
-        "description": "Height of the video frames to display. The default value is only valid when DisplayUnit is 0."
-    },
-    "54b0": {
-        "name": "DisplayWidth",
-        "cppname": "VideoDisplayWidth",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "PixelWidth",
-        "range": "not 0",
-        "description": "Width of the video frames to display. The default value is only valid when DisplayUnit is 0."
-    },
-    "54dd": {
-        "name": "PixelCropRight",
-        "cppname": "VideoPixelCropRight",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "The number of video pixels to remove on the right of the image."
-    },
-    "54cc": {
-        "name": "PixelCropLeft",
-        "cppname": "VideoPixelCropLeft",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "The number of video pixels to remove on the left of the image."
-    },
-    "54bb": {
-        "name": "PixelCropTop",
-        "cppname": "VideoPixelCropTop",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "The number of video pixels to remove at the top of the image."
-    },
-    "54aa": {
-        "name": "PixelCropBottom",
-        "cppname": "VideoPixelCropBottom",
-        "level": "4",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "description": "The number of video pixels to remove at the bottom of the image (for HDTV content)."
-    },
-    "ba": {
-        "name": "PixelHeight",
-        "cppname": "VideoPixelHeight",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "not 0",
-        "description": "Height of the encoded video frames in pixels."
-    },
-    "b0": {
-        "name": "PixelWidth",
-        "cppname": "VideoPixelWidth",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "not 0",
-        "description": "Width of the encoded video frames in pixels."
-    },
-    "53b9": {
-        "name": "OldStereoMode",
-        "level": "4",
-        "type": "u",
-        "maxver": "0",
-        "webm": "0",
-        "divx": "0",
-        "description": "DEPRECATED, DO NOT USE. Bogus StereoMode value used in old versions of libmatroska. (0: mono, 1: right eye, 2: left eye, 3: both eyes)."
-    },
-    "53c0": {
-        "name": "AlphaMode",
-        "cppname": "VideoAlphaMode",
-        "level": "4",
-        "type": "u",
-        "minver": "3",
-        "webm": "1",
-        "default": "0",
-        "description": "Alpha Video Mode. Presence of this element indicates that the BlockAdditional element could contain Alpha data."
-    },
-    "53b8": {
-        "name": "StereoMode",
-        "cppname": "VideoStereoMode",
-        "level": "4",
-        "type": "u",
-        "minver": "3",
-        "webm": "1",
-        "default": "0",
-        "description": "Stereo-3D video mode (0: mono, 1: side by side (left eye is first), 2: top-bottom (right eye is first), 3: top-bottom (left eye is first), 4: checkboard (right is first), 5: checkboard (left is first), 6: row interleaved (right is first), 7: row interleaved (left is first), 8: column interleaved (right is first), 9: column interleaved (left is first), 10: anaglyph (cyan/red), 11: side by side (right eye is first), 12: anaglyph (green/magenta), 13 both eyes laced in one Block (left eye is first), 14 both eyes laced in one Block (right eye is first)) . There are some more details on 3D support in the Specification Notes."
-    },
-    "9a": {
-        "name": "FlagInterlaced",
-        "cppname": "VideoFlagInterlaced",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "2",
-        "webm": "1",
-        "default": "0",
-        "range": "0-1",
-        "description": "Set if the video is interlaced. (1 bit)"
-    },
-    "e0": {
-        "name": "Video",
-        "cppname": "TrackVideo",
-        "level": "3",
-        "type": "m",
-        "minver": "1",
-        "description": "Video settings."
-    },
-    "66a5": {
-        "name": "TrackTranslateTrackID",
-        "level": "4",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The binary value used to represent this track in the chapter codec data. The format depends on the ChapProcessCodecID used."
-    },
-    "66bf": {
-        "name": "TrackTranslateCodec",
-        "level": "4",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The chapter codec using this ID (0: Matroska Script, 1: DVD-menu)."
-    },
-    "66fc": {
-        "name": "TrackTranslateEditionUID",
-        "level": "4",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Specify an edition UID on which this translation applies. When not specified, it means for all editions found in the segment."
-    },
-    "56bb": {
-        "name": "SeekPreRoll",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "multiple": "0",
-        "default": "0",
-        "minver": "4",
-        "webm": "1",
-        "description": "After a discontinuity, SeekPreRoll is the duration in nanoseconds of the data the decoder must decode before the decoded data is valid."
-    },
-    "56aa": {
-        "name": "CodecDelay",
-        "level": "3",
-        "type": "u",
-        "multiple": "0",
-        "default": "0",
-        "minver": "4",
-        "webm": "1",
-        "description": "CodecDelay is The codec-built-in delay in nanoseconds. This value must be subtracted from each block timestamp in order to get the actual timestamp. The value should be small so the muxing of tracks with the same actual timestamp are in the same Cluster."
-    },
-    "6fab": {
-        "name": "TrackOverlay",
-        "level": "3",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Specify that this track is an overlay track for the Track specified (in the u-integer). That means when this track has a gap (see SilentTracks) the overlay track should be used instead. The order of multiple TrackOverlay matters, the first one is the one that should be used. If not found it should be the second, etc."
-    },
-    "aa": {
-        "name": "CodecDecodeAll",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "2",
-        "webm": "0",
-        "default": "1",
-        "range": "0-1",
-        "description": "The codec can decode potentially damaged data (1 bit)."
-    },
-    "26b240": {
-        "name": "CodecDownloadURL",
-        "level": "3",
-        "type": "s",
-        "multiple": "1",
-        "webm": "0",
-        "description": "A URL to download about the codec used."
-    },
-    "3b4040": {
-        "name": "CodecInfoURL",
-        "level": "3",
-        "type": "s",
-        "multiple": "1",
-        "webm": "0",
-        "description": "A URL to find information about the codec used."
-    },
-    "3a9697": {
-        "name": "CodecSettings",
-        "level": "3",
-        "type": "8",
-        "webm": "0",
-        "description": "A string describing the encoding setting used."
-    },
-    "63a2": {
-        "name": "CodecPrivate",
-        "level": "3",
-        "type": "b",
-        "minver": "1",
-        "description": "Private data only known to the codec."
-    },
-    "22b59c": {
-        "name": "Language",
-        "cppname": "TrackLanguage",
-        "level": "3",
-        "type": "s",
-        "minver": "1",
-        "default": "eng",
-        "description": "Specifies the language of the track in the Matroska languages form."
-    },
-    "536e": {
-        "name": "Name",
-        "cppname": "TrackName",
-        "level": "3",
-        "type": "8",
-        "minver": "1",
-        "description": "A human-readable track name."
-    },
-    "55ee": {
-        "name": "MaxBlockAdditionID",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "The maximum value of BlockAdditions for this track."
-    },
-    "537f": {
-        "name": "TrackOffset",
-        "level": "3",
-        "type": "i",
-        "webm": "0",
-        "default": "0",
-        "description": "A value to add to the Block's Timestamp. This can be used to adjust the playback offset of a track."
-    },
-    "23314f": {
-        "name": "TrackTimecodeScale",
-        "level": "3",
-        "type": "f",
-        "mandatory": "1",
-        "minver": "1",
-        "maxver": "3",
-        "webm": "0",
-        "default": "1.0",
-        "range": "> 0",
-        "description": "DEPRECATED, DO NOT USE. The scale to apply on this track to work at normal speed in relation with other tracks (mostly used to adjust video speed when the audio length differs)."
-    },
-    "234e7a": {
-        "name": "DefaultDecodedFieldDuration",
-        "cppname": "TrackDefaultDecodedFieldDuration",
-        "level": "3",
-        "type": "u",
-        "minver": "4",
-        "range": "not 0",
-        "description": "The period in nanoseconds (not scaled by TimcodeScale)\nbetween two successive fields at the output of the decoding process (see the notes)"
-    },
-    "23e383": {
-        "name": "DefaultDuration",
-        "cppname": "TrackDefaultDuration",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "range": "not 0",
-        "description": "Number of nanoseconds (not scaled via TimecodeScale) per frame ('frame' in the Matroska sense -- one element put into a (Simple)Block)."
-    },
-    "6df8": {
-        "name": "MaxCache",
-        "cppname": "TrackMaxCache",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "description": "The maximum cache size required to store referenced frames in and the current frame. 0 means no cache is needed."
-    },
-    "6de7": {
-        "name": "MinCache",
-        "cppname": "TrackMinCache",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "The minimum number of frames a player should be able to cache during playback. If set to 0, the reference pseudo-cache system is not used."
-    },
-    "9c": {
-        "name": "FlagLacing",
-        "cppname": "TrackFlagLacing",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "1",
-        "range": "0-1",
-        "description": "Set if the track may contain blocks using lacing. (1 bit)"
-    },
-    "55aa": {
-        "name": "FlagForced",
-        "cppname": "TrackFlagForced",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "0",
-        "range": "0-1",
-        "description": "Set if that track MUST be active during playback. There can be many forced track for a kind (audio, video or subs), the player should select the one which language matches the user preference or the default + forced track. Overlay MAY happen between a forced and non-forced track of the same kind. (1 bit)"
-    },
-    "b9": {
-        "name": "FlagEnabled",
-        "cppname": "TrackFlagEnabled",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "2",
-        "webm": "1",
-        "default": "1",
-        "range": "0-1",
-        "description": "Set if the track is usable. (1 bit)"
-    },
-    "73c5": {
-        "name": "TrackUID",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "not 0",
-        "description": "A unique ID to identify the Track. This should be kept the same when making a direct stream copy of the Track to another file."
-    },
-    "d7": {
-        "name": "TrackNumber",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "range": "not 0",
-        "description": "The track number as used in the Block Header (using more than 127 tracks is not encouraged, though the design allows an unlimited number)."
-    },
-    "ae": {
-        "name": "TrackEntry",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Describes a track with all elements."
-    },
-    "1654ae6b": {
-        "name": "Tracks",
-        "level": "1",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "description": "A top-level block of information with many tracks described."
-    },
-    "af": {
-        "name": "EncryptedBlock",
-        "level": "2",
-        "type": "b",
-        "multiple": "1",
-        "webm": "0",
-        "description": "Similar to EncryptedBlock Structure)"
-    },
-    "ca": {
-        "name": "ReferenceTimeCode",
-        "level": "4",
-        "type": "u",
-        "multiple": "0",
-        "mandatory": "1",
-        "minver": "0",
-        "webm": "0",
-        "divx": "1",
-        "description": "DivX trick track extenstions"
-    },
-    "c9": {
-        "name": "ReferenceOffset",
-        "level": "4",
-        "type": "u",
-        "multiple": "0",
-        "mandatory": "1",
-        "minver": "0",
-        "webm": "0",
-        "divx": "1",
-        "description": "DivX trick track extenstions"
-    },
-    "c8": {
-        "name": "ReferenceFrame",
-        "level": "3",
-        "type": "m",
-        "multiple": "0",
-        "minver": "0",
-        "webm": "0",
-        "divx": "1",
-        "description": "DivX trick track extenstions"
-    },
-    "cf": {
-        "name": "SliceDuration",
-        "level": "5",
-        "type": "u",
-        "default": "0",
-        "description": "The (scaled) duration to apply to the element."
-    },
-    "ce": {
-        "name": "Delay",
-        "cppname": "SliceDelay",
-        "level": "5",
-        "type": "u",
-        "default": "0",
-        "description": "The (scaled) delay to apply to the element."
-    },
-    "cb": {
-        "name": "BlockAdditionID",
-        "cppname": "SliceBlockAddID",
-        "level": "5",
-        "type": "u",
-        "default": "0",
-        "description": "The ID of the BlockAdditional element (0 is the main Block)."
-    },
-    "cd": {
-        "name": "FrameNumber",
-        "cppname": "SliceFrameNumber",
-        "level": "5",
-        "type": "u",
-        "default": "0",
-        "description": "The number of the frame to generate from this lace with this delay (allow you to generate many frames from the same Block/Frame)."
-    },
-    "cc": {
-        "name": "LaceNumber",
-        "cppname": "SliceLaceNumber",
-        "level": "5",
-        "type": "u",
-        "minver": "1",
-        "default": "0",
-        "divx": "0",
-        "description": "The reverse number of the frame in the lace (0 is the last frame, 1 is the next to last, etc). While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback."
-    },
-    "e8": {
-        "name": "TimeSlice",
-        "level": "4",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "divx": "0",
-        "description": "Contains extra time information about the data contained in the Block. While there are a few files in the wild with this element, it is no longer in use and has been deprecated. Being able to interpret this element is not required for playback."
-    },
-    "8e": {
-        "name": "Slices",
-        "level": "3",
-        "type": "m",
-        "minver": "1",
-        "divx": "0",
-        "description": "Contains slices description."
-    },
-    "75a2": {
-        "name": "DiscardPadding",
-        "level": "3",
-        "type": "i",
-        "minver": "4",
-        "webm": "1",
-        "description": "Duration in nanoseconds of the silent data added to the Block (padding at the end of the Block for positive value, at the beginning of the Block for negative value). The duration of DiscardPadding is not calculated in the duration of the TrackEntry and should be discarded during playback."
-    },
-    "a4": {
-        "name": "CodecState",
-        "level": "3",
-        "type": "b",
-        "minver": "2",
-        "webm": "0",
-        "description": "The new codec state to use. Data interpretation is private to the codec. This information should always be referenced by a seek entry."
-    },
-    "fd": {
-        "name": "ReferenceVirtual",
-        "level": "3",
-        "type": "i",
-        "webm": "0",
-        "description": "Relative position of the data that should be in position of the virtual block."
-    },
-    "fb": {
-        "name": "ReferenceBlock",
-        "level": "3",
-        "type": "i",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Timestamp of another frame used as a reference (ie: B or P frame). The timestamp is relative to the block it's attached to."
-    },
-    "fa": {
-        "name": "ReferencePriority",
-        "cppname": "FlagReferenced",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "0",
-        "description": "This frame is referenced and has the specified cache priority. In cache only a frame of the same or higher priority can replace this frame. A value of 0 means the frame is not referenced."
-    },
-    "9b": {
-        "name": "BlockDuration",
-        "level": "3",
-        "type": "u",
-        "minver": "1",
-        "default": "TrackDuration",
-        "description": "The duration of the Block (based on TimecodeScale). This element is mandatory when DefaultDuration is set for the track (but can be omitted as other default values). When not written and with no DefaultDuration, the value is assumed to be the difference between the timestamp of this Block and the timestamp of the next Block in \"display\" order (not coding order). This element can be useful at the end of a Track (as there is not other Block available), or when there is a break in a track like for subtitle tracks. When set to 0 that means the frame is not a keyframe."
-    },
-    "a5": {
-        "name": "BlockAdditional",
-        "level": "5",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Interpreted by the codec as it wishes (using the BlockAddID)."
-    },
-    "ee": {
-        "name": "BlockAddID",
-        "level": "5",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "default": "1",
-        "range": "not 0",
-        "description": "An ID to identify the BlockAdditional level."
-    },
-    "a6": {
-        "name": "BlockMore",
-        "level": "4",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contain the BlockAdditional and some parameters."
-    },
-    "75a1": {
-        "name": "BlockAdditions",
-        "level": "3",
-        "type": "m",
-        "minver": "1",
-        "webm": "0",
-        "description": "Contain additional blocks to complete the main one. An EBML parser that has no knowledge of the Block structure could still see and use/skip these data."
-    },
-    "a2": {
-        "name": "BlockVirtual",
-        "level": "3",
-        "type": "b",
-        "webm": "0",
-        "description": "A Block with no data. It must be stored in the stream at the place the real Block should be in display order. (see Block Virtual)"
-    },
-    "a1": {
-        "name": "Block",
-        "level": "3",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "Block containing the actual data to be rendered and a timestamp relative to the Cluster Timecode. (see Block Structure)"
-    },
-    "a0": {
-        "name": "BlockGroup",
-        "level": "2",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Basic container of information containing a single Block or BlockVirtual, and information specific to that Block/VirtualBlock."
-    },
-    "a3": {
-        "name": "SimpleBlock",
-        "level": "2",
-        "type": "b",
-        "multiple": "1",
-        "minver": "2",
-        "webm": "1",
-        "divx": "1",
-        "description": "Similar to SimpleBlock Structure)"
-    },
-    "ab": {
-        "name": "PrevSize",
-        "cppname": "ClusterPrevSize",
-        "level": "2",
-        "type": "u",
-        "minver": "1",
-        "description": "Size of the previous Cluster, in octets. Can be useful for backward playing."
-    },
-    "a7": {
-        "name": "Position",
-        "cppname": "ClusterPosition",
-        "level": "2",
-        "type": "u",
-        "minver": "1",
-        "webm": "0",
-        "description": "The Position of the Cluster in the segment (0 in live broadcast streams). It might help to resynchronise offset on damaged streams."
-    },
-    "58d7": {
-        "name": "SilentTrackNumber",
-        "cppname": "ClusterSilentTrackNumber",
-        "level": "3",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "One of the track number that are not used from now on in the stream. It could change later if not specified as silent in a further Cluster."
-    },
-    "e7": {
-        "name": "Timecode",
-        "cppname": "ClusterTimecode",
-        "level": "2",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "Absolute timestamp of the cluster (based on TimecodeScale)."
-    },
-    "1f43b675": {
-        "name": "Cluster",
-        "level": "1",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "description": "The lower level element containing the (monolithic) Block structure."
-    },
-    "4d80": {
-        "name": "MuxingApp",
-        "level": "2",
-        "type": "8",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "Muxing application or library (\"libmatroska-0.4.3\")."
-    },
-    "7ba9": {
-        "name": "Title",
-        "level": "2",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "General name of the segment."
-    },
-    "2ad7b2": {
-        "name": "TimecodeScaleDenominator",
-        "level": "2",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "4",
-        "default": "1000000000",
-        "description": "Timestamp scale numerator, see TimecodeScale."
-    },
-    "2ad7b1": {
-        "name": "TimecodeScale",
-        "level": "2",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "default": "1000000",
-        "description": "Timestamp scale in nanoseconds (1.000.000 means all timestamps in the segment are expressed in milliseconds)."
-    },
-    "69a5": {
-        "name": "ChapterTranslateID",
-        "level": "3",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The binary value used to represent this segment in the chapter codec data. The format depends on the ChapProcessCodecID used."
-    },
-    "69bf": {
-        "name": "ChapterTranslateCodec",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "The chapter codec using this ID (0: Matroska Script, 1: DVD-menu)."
-    },
-    "69fc": {
-        "name": "ChapterTranslateEditionUID",
-        "level": "3",
-        "type": "u",
-        "multiple": "1",
-        "minver": "1",
-        "webm": "0",
-        "description": "Specify an edition UID on which this correspondance applies. When not specified, it means for all editions found in the segment."
-    },
-    "3e83bb": {
-        "name": "NextFilename",
-        "level": "2",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "An escaped filename corresponding to the next segment."
-    },
-    "3eb923": {
-        "name": "NextUID",
-        "level": "2",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "bytesize": "16",
-        "description": "A unique ID to identify the next chained segment (128 bits)."
-    },
-    "3c83ab": {
-        "name": "PrevFilename",
-        "level": "2",
-        "type": "8",
-        "minver": "1",
-        "webm": "0",
-        "description": "An escaped filename corresponding to the previous segment."
-    },
-    "3cb923": {
-        "name": "PrevUID",
-        "level": "2",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "bytesize": "16",
-        "description": "A unique ID to identify the previous chained segment (128 bits)."
-    },
-    "73a4": {
-        "name": "SegmentUID",
-        "level": "2",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "range": "not 0",
-        "bytesize": "16",
-        "description": "A randomly generated unique ID to identify the current segment between many others (128 bits)."
-    },
-    "1549a966": {
-        "name": "Info",
-        "level": "1",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Contains miscellaneous general information and statistics on the file."
-    },
-    "53ac": {
-        "name": "SeekPosition",
-        "level": "3",
-        "type": "u",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "The position of the element in the segment in octets (0 = first level 1 element)."
-    },
-    "53ab": {
-        "name": "SeekID",
-        "level": "3",
-        "type": "b",
-        "mandatory": "1",
-        "minver": "1",
-        "description": "The binary ID corresponding to the element name."
-    },
-    "4dbb": {
-        "name": "Seek",
-        "cppname": "SeekPoint",
-        "level": "2",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Contains a single seek entry to an EBML element."
-    },
-    "114d9b74": {
-        "name": "SeekHead",
-        "cppname": "SeekHeader",
-        "level": "1",
-        "type": "m",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Contains the position of other level 1 elements."
-    },
-    "7e7b": {
-        "name": "SignatureElementList",
-        "level": "2",
-        "type": "m",
-        "multiple": "1",
-        "webm": "0",
-        "i": "Cluster|Block|BlockAdditional",
-        "description": "A list consists of a number of consecutive elements that represent one case where data is used in signature. Ex:  means that the BlockAdditional of all Blocks in all Clusters is used for encryption."
-    },
-    "7e5b": {
-        "name": "SignatureElements",
-        "level": "1",
-        "type": "m",
-        "webm": "0",
-        "description": "Contains elements that will be used to compute the signature."
-    },
-    "7eb5": {
-        "name": "Signature",
-        "level": "1",
-        "type": "b",
-        "webm": "0",
-        "description": "The signature of the data (until a new."
-    },
-    "7ea5": {
-        "name": "SignaturePublicKey",
-        "level": "1",
-        "type": "b",
-        "webm": "0",
-        "description": "The public key to use with the algorithm (in the case of a PKI-based signature)."
-    },
-    "7e9a": {
-        "name": "SignatureHash",
-        "level": "1",
-        "type": "u",
-        "webm": "0",
-        "description": "Hash algorithm used (1=SHA1-160, 2=MD5)."
-    },
-    "7e8a": {
-        "name": "SignatureAlgo",
-        "level": "1",
-        "type": "u",
-        "webm": "0",
-        "description": "Signature algorithm used (1=RSA, 2=elliptic)."
-    },
-    "1b538667": {
-        "name": "SignatureSlot",
-        "level": "-1",
-        "type": "m",
-        "multiple": "1",
-        "webm": "0",
-        "description": "Contain signature of some (coming) elements in the stream."
-    },
-    "bf": {
-        "name": "CRC-32",
-        "level": "-1",
-        "type": "b",
-        "minver": "1",
-        "webm": "0",
-        "description": "The CRC is computed on all the data of the Master element it's in. The CRC element should be the first in it's parent master for easier reading. All level 1 elements should include a CRC-32. The CRC in use is the IEEE CRC32 Little Endian"
-    },
-    "ec": {
-        "name": "Void",
-        "level": "-1",
-        "type": "b",
-        "minver": "1",
-        "description": "Used to void damaged data, to avoid unexpected behaviors when using damaged data. The content is discarded. Also used to reserve space in a sub-element for later use."
-    },
-    "42f3": {
-        "name": "EBMLMaxSizeLength",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "8",
-        "minver": "1",
-        "description": "The maximum length of the sizes you'll find in this file (8 or less in Matroska). This does not override the element size indicated at the beginning of an element. Elements that have an indicated size which is larger than what is allowed by EBMLMaxSizeLength shall be considered invalid."
-    },
-    "42f2": {
-        "name": "EBMLMaxIDLength",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "4",
-        "minver": "1",
-        "description": "The maximum length of the IDs you'll find in this file (4 or less in Matroska)."
-    },
-    "42f7": {
-        "name": "EBMLReadVersion",
-        "level": "1",
-        "type": "u",
-        "mandatory": "1",
-        "default": "1",
-        "minver": "1",
-        "description": "The minimum EBML version a parser has to support to read this file."
-    },
-    "1a45dfa3": {
-        "name": "EBML",
-        "level": "0",
-        "type": "m",
-        "mandatory": "1",
-        "multiple": "1",
-        "minver": "1",
-        "description": "Set the EBML characteristics of the data to follow. Each EBML document has to start with this."
-    }
-};
-
-module.exports = schema;
-
-},{}],47:[function(require,module,exports){
-(function (Buffer){
-var tools = {
-    readVint: function(buffer, start) {
-        start = start || 0;
-        for (var length = 1; length <= 8; length++) {
-            if (buffer[start] >= Math.pow(2, 8 - length)) {
-                break;
-            }
-        }
-        if (length > 8) {
-            throw new Error("Unrepresentable length: " + length + " " +
-                buffer.toString('hex', start, start + length));
-        }
-        if (start + length > buffer.length) {
-            return null;
-        }
-        var value = buffer[start] & (1 << (8 - length)) - 1;
-        for (var i = 1; i < length; i++) {
-            if (i === 7) {
-                if (value >= Math.pow(2, 53 - 8) && buffer[start + 7] > 0) {
-                    return {
-                        length: length,
-                        value: -1
-                    };
-                }
-            }
-            value *= Math.pow(2, 8);
-            value += buffer[start + i];
-        }
-        return {
-            length: length,
-            value: value
-        };
-    },
-
-    writeVint: function(value) {
-        if (value < 0 || value > Math.pow(2, 53)) {
-            throw new Error("Unrepresentable value: " + value);
-        }
-        for (var length = 1; length <= 8; length++) {
-            if (value < Math.pow(2, 7 * length) - 1) {
-                break;
-            }
-        }
-        var buffer = new Buffer(length);
-        for (var i = 1; i <= length; i++) {
-            var b = value & 0xFF;
-            buffer[length - i] = b;
-            value -= b;
-            value /= Math.pow(2, 8);
-        }
-        buffer[0] = buffer[0] | (1 << (8 - length));
-        return buffer;
-    }
-};
-
-module.exports = tools;
-
-}).call(this,require("buffer").Buffer)
-},{"buffer":4}],48:[function(require,module,exports){
-/**
- * Helpers.
- */
-
-var s = 1000;
-var m = s * 60;
-var h = m * 60;
-var d = h * 24;
-var y = d * 365.25;
-
-/**
- * Parse or format the given `val`.
- *
- * Options:
- *
- *  - `long` verbose formatting [false]
- *
- * @param {String|Number} val
- * @param {Object} [options]
- * @throws {Error} throw an error if val is not a non-empty string or a number
- * @return {String|Number}
- * @api public
- */
-
-module.exports = function(val, options) {
-  options = options || {};
-  var type = typeof val;
-  if (type === 'string' && val.length > 0) {
-    return parse(val);
-  } else if (type === 'number' && isNaN(val) === false) {
-    return options.long ? fmtLong(val) : fmtShort(val);
-  }
-  throw new Error(
-    'val is not a non-empty string or a valid number. val=' +
-      JSON.stringify(val)
-  );
-};
-
-/**
- * Parse the given `str` and return milliseconds.
- *
- * @param {String} str
- * @return {Number}
- * @api private
- */
-
-function parse(str) {
-  str = String(str);
-  if (str.length > 100) {
-    return;
-  }
-  var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(
-    str
-  );
-  if (!match) {
-    return;
-  }
-  var n = parseFloat(match[1]);
-  var type = (match[2] || 'ms').toLowerCase();
-  switch (type) {
-    case 'years':
-    case 'year':
-    case 'yrs':
-    case 'yr':
-    case 'y':
-      return n * y;
-    case 'days':
-    case 'day':
-    case 'd':
-      return n * d;
-    case 'hours':
-    case 'hour':
-    case 'hrs':
-    case 'hr':
-    case 'h':
-      return n * h;
-    case 'minutes':
-    case 'minute':
-    case 'mins':
-    case 'min':
-    case 'm':
-      return n * m;
-    case 'seconds':
-    case 'second':
-    case 'secs':
-    case 'sec':
-    case 's':
-      return n * s;
-    case 'milliseconds':
-    case 'millisecond':
-    case 'msecs':
-    case 'msec':
-    case 'ms':
-      return n;
-    default:
-      return undefined;
-  }
-}
-
-/**
- * Short format for `ms`.
- *
- * @param {Number} ms
- * @return {String}
- * @api private
- */
-
-function fmtShort(ms) {
-  if (ms >= d) {
-    return Math.round(ms / d) + 'd';
-  }
-  if (ms >= h) {
-    return Math.round(ms / h) + 'h';
-  }
-  if (ms >= m) {
-    return Math.round(ms / m) + 'm';
-  }
-  if (ms >= s) {
-    return Math.round(ms / s) + 's';
-  }
-  return ms + 'ms';
-}
-
-/**
- * Long format for `ms`.
- *
- * @param {Number} ms
- * @return {String}
- * @api private
- */
-
-function fmtLong(ms) {
-  return plural(ms, d, 'day') ||
-    plural(ms, h, 'hour') ||
-    plural(ms, m, 'minute') ||
-    plural(ms, s, 'second') ||
-    ms + ' ms';
-}
-
-/**
- * Pluralization helper.
- */
-
-function plural(ms, n, name) {
-  if (ms < n) {
-    return;
-  }
-  if (ms < n * 1.5) {
-    return Math.floor(ms / n) + ' ' + name;
-  }
-  return Math.ceil(ms / n) + ' ' + name + 's';
-}
-
-},{}],49:[function(require,module,exports){
-const fs = require('fs')
-const MatroskaSubtitles = require('matroska-subtitles')
-
-var parser = new MatroskaSubtitles()
-
-// first an array of subtitle track information is emitted
-parser.once('tracks', function (tracks) {
-  console.log(tracks)
-})
-
-// afterwards each subtitle is emitted
-parser.on('subtitle', function (subtitle, trackNumber) {
-  console.log('Track ' + trackNumber + ':', subtitle)
-})
-},{"fs":1,"matroska-subtitles":40}]},{},[49]);
diff --git a/test.js b/test.js
deleted file mode 100644
index e69de29..0000000