GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
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Current File : /usr/lib/node_modules/npm/node_modules/pacote/node_modules/minipass/index.js
'use strict'
const EE = require('events')
const Yallist = require('yallist')
const SD = require('string_decoder').StringDecoder

const EOF = Symbol('EOF')
const MAYBE_EMIT_END = Symbol('maybeEmitEnd')
const EMITTED_END = Symbol('emittedEnd')
const EMITTING_END = Symbol('emittingEnd')
const CLOSED = Symbol('closed')
const READ = Symbol('read')
const FLUSH = Symbol('flush')
const FLUSHCHUNK = Symbol('flushChunk')
const ENCODING = Symbol('encoding')
const DECODER = Symbol('decoder')
const FLOWING = Symbol('flowing')
const PAUSED = Symbol('paused')
const RESUME = Symbol('resume')
const BUFFERLENGTH = Symbol('bufferLength')
const BUFFERPUSH = Symbol('bufferPush')
const BUFFERSHIFT = Symbol('bufferShift')
const OBJECTMODE = Symbol('objectMode')
const DESTROYED = Symbol('destroyed')

// TODO remove when Node v8 support drops
const doIter = global._MP_NO_ITERATOR_SYMBOLS_  !== '1'
const ASYNCITERATOR = doIter && Symbol.asyncIterator
  || Symbol('asyncIterator not implemented')
const ITERATOR = doIter && Symbol.iterator
  || Symbol('iterator not implemented')

// Buffer in node 4.x < 4.5.0 doesn't have working Buffer.from
// or Buffer.alloc, and Buffer in node 10 deprecated the ctor.
// .M, this is fine .\^/M..
const B = Buffer.alloc ? Buffer
  : /* istanbul ignore next */ require('safe-buffer').Buffer

// events that mean 'the stream is over'
// these are treated specially, and re-emitted
// if they are listened for after emitting.
const isEndish = ev =>
  ev === 'end' ||
  ev === 'finish' ||
  ev === 'prefinish'

const isArrayBuffer = b => b instanceof ArrayBuffer ||
  typeof b === 'object' &&
  b.constructor &&
  b.constructor.name === 'ArrayBuffer' &&
  b.byteLength >= 0

const isArrayBufferView = b => !B.isBuffer(b) && ArrayBuffer.isView(b)

module.exports = class Minipass extends EE {
  constructor (options) {
    super()
    this[FLOWING] = false
    // whether we're explicitly paused
    this[PAUSED] = false
    this.pipes = new Yallist()
    this.buffer = new Yallist()
    this[OBJECTMODE] = options && options.objectMode || false
    if (this[OBJECTMODE])
      this[ENCODING] = null
    else
      this[ENCODING] = options && options.encoding || null
    if (this[ENCODING] === 'buffer')
      this[ENCODING] = null
    this[DECODER] = this[ENCODING] ? new SD(this[ENCODING]) : null
    this[EOF] = false
    this[EMITTED_END] = false
    this[EMITTING_END] = false
    this[CLOSED] = false
    this.writable = true
    this.readable = true
    this[BUFFERLENGTH] = 0
    this[DESTROYED] = false
  }

  get bufferLength () { return this[BUFFERLENGTH] }

  get encoding () { return this[ENCODING] }
  set encoding (enc) {
    if (this[OBJECTMODE])
      throw new Error('cannot set encoding in objectMode')

    if (this[ENCODING] && enc !== this[ENCODING] &&
        (this[DECODER] && this[DECODER].lastNeed || this[BUFFERLENGTH]))
      throw new Error('cannot change encoding')

    if (this[ENCODING] !== enc) {
      this[DECODER] = enc ? new SD(enc) : null
      if (this.buffer.length)
        this.buffer = this.buffer.map(chunk => this[DECODER].write(chunk))
    }

    this[ENCODING] = enc
  }

  setEncoding (enc) {
    this.encoding = enc
  }

  get objectMode () { return this[OBJECTMODE] }
  set objectMode (ॐ ) { this[OBJECTMODE] = this[OBJECTMODE] || !!ॐ  }

  write (chunk, encoding, cb) {
    if (this[EOF])
      throw new Error('write after end')

    if (this[DESTROYED]) {
      this.emit('error', Object.assign(
        new Error('Cannot call write after a stream was destroyed'),
        { code: 'ERR_STREAM_DESTROYED' }
      ))
      return true
    }

    if (typeof encoding === 'function')
      cb = encoding, encoding = 'utf8'

    if (!encoding)
      encoding = 'utf8'

    // convert array buffers and typed array views into buffers
    // at some point in the future, we may want to do the opposite!
    // leave strings and buffers as-is
    // anything else switches us into object mode
    if (!this[OBJECTMODE] && !B.isBuffer(chunk)) {
      if (isArrayBufferView(chunk))
        chunk = B.from(chunk.buffer, chunk.byteOffset, chunk.byteLength)
      else if (isArrayBuffer(chunk))
        chunk = B.from(chunk)
      else if (typeof chunk !== 'string')
        // use the setter so we throw if we have encoding set
        this.objectMode = true
    }

    // this ensures at this point that the chunk is a buffer or string
    // don't buffer it up or send it to the decoder
    if (!this.objectMode && !chunk.length) {
      const ret = this.flowing
      if (this[BUFFERLENGTH] !== 0)
        this.emit('readable')
      if (cb)
        cb()
      return ret
    }

    // fast-path writing strings of same encoding to a stream with
    // an empty buffer, skipping the buffer/decoder dance
    if (typeof chunk === 'string' && !this[OBJECTMODE] &&
        // unless it is a string already ready for us to use
        !(encoding === this[ENCODING] && !this[DECODER].lastNeed)) {
      chunk = B.from(chunk, encoding)
    }

    if (B.isBuffer(chunk) && this[ENCODING])
      chunk = this[DECODER].write(chunk)

    try {
      return this.flowing
        ? (this.emit('data', chunk), this.flowing)
        : (this[BUFFERPUSH](chunk), false)
    } finally {
      if (this[BUFFERLENGTH] !== 0)
        this.emit('readable')
      if (cb)
        cb()
    }
  }

  read (n) {
    if (this[DESTROYED])
      return null

    try {
      if (this[BUFFERLENGTH] === 0 || n === 0 || n > this[BUFFERLENGTH])
        return null

      if (this[OBJECTMODE])
        n = null

      if (this.buffer.length > 1 && !this[OBJECTMODE]) {
        if (this.encoding)
          this.buffer = new Yallist([
            Array.from(this.buffer).join('')
          ])
        else
          this.buffer = new Yallist([
            B.concat(Array.from(this.buffer), this[BUFFERLENGTH])
          ])
      }

      return this[READ](n || null, this.buffer.head.value)
    } finally {
      this[MAYBE_EMIT_END]()
    }
  }

  [READ] (n, chunk) {
    if (n === chunk.length || n === null)
      this[BUFFERSHIFT]()
    else {
      this.buffer.head.value = chunk.slice(n)
      chunk = chunk.slice(0, n)
      this[BUFFERLENGTH] -= n
    }

    this.emit('data', chunk)

    if (!this.buffer.length && !this[EOF])
      this.emit('drain')

    return chunk
  }

  end (chunk, encoding, cb) {
    if (typeof chunk === 'function')
      cb = chunk, chunk = null
    if (typeof encoding === 'function')
      cb = encoding, encoding = 'utf8'
    if (chunk)
      this.write(chunk, encoding)
    if (cb)
      this.once('end', cb)
    this[EOF] = true
    this.writable = false

    // if we haven't written anything, then go ahead and emit,
    // even if we're not reading.
    // we'll re-emit if a new 'end' listener is added anyway.
    // This makes MP more suitable to write-only use cases.
    if (this.flowing || !this[PAUSED])
      this[MAYBE_EMIT_END]()
    return this
  }

  // don't let the internal resume be overwritten
  [RESUME] () {
    if (this[DESTROYED])
      return

    this[PAUSED] = false
    this[FLOWING] = true
    this.emit('resume')
    if (this.buffer.length)
      this[FLUSH]()
    else if (this[EOF])
      this[MAYBE_EMIT_END]()
    else
      this.emit('drain')
  }

  resume () {
    return this[RESUME]()
  }

  pause () {
    this[FLOWING] = false
    this[PAUSED] = true
  }

  get destroyed () {
    return this[DESTROYED]
  }

  get flowing () {
    return this[FLOWING]
  }

  get paused () {
    return this[PAUSED]
  }

  [BUFFERPUSH] (chunk) {
    if (this[OBJECTMODE])
      this[BUFFERLENGTH] += 1
    else
      this[BUFFERLENGTH] += chunk.length
    return this.buffer.push(chunk)
  }

  [BUFFERSHIFT] () {
    if (this.buffer.length) {
      if (this[OBJECTMODE])
        this[BUFFERLENGTH] -= 1
      else
        this[BUFFERLENGTH] -= this.buffer.head.value.length
    }
    return this.buffer.shift()
  }

  [FLUSH] () {
    do {} while (this[FLUSHCHUNK](this[BUFFERSHIFT]()))

    if (!this.buffer.length && !this[EOF])
      this.emit('drain')
  }

  [FLUSHCHUNK] (chunk) {
    return chunk ? (this.emit('data', chunk), this.flowing) : false
  }

  pipe (dest, opts) {
    if (this[DESTROYED])
      return

    const ended = this[EMITTED_END]
    opts = opts || {}
    if (dest === process.stdout || dest === process.stderr)
      opts.end = false
    else
      opts.end = opts.end !== false

    const p = { dest: dest, opts: opts, ondrain: _ => this[RESUME]() }
    this.pipes.push(p)

    dest.on('drain', p.ondrain)
    this[RESUME]()
    // piping an ended stream ends immediately
    if (ended && p.opts.end)
      p.dest.end()
    return dest
  }

  addListener (ev, fn) {
    return this.on(ev, fn)
  }

  on (ev, fn) {
    try {
      return super.on(ev, fn)
    } finally {
      if (ev === 'data' && !this.pipes.length && !this.flowing)
        this[RESUME]()
      else if (isEndish(ev) && this[EMITTED_END]) {
        super.emit(ev)
        this.removeAllListeners(ev)
      }
    }
  }

  get emittedEnd () {
    return this[EMITTED_END]
  }

  [MAYBE_EMIT_END] () {
    if (!this[EMITTING_END] &&
        !this[EMITTED_END] &&
        !this[DESTROYED] &&
        this.buffer.length === 0 &&
        this[EOF]) {
      this[EMITTING_END] = true
      this.emit('end')
      this.emit('prefinish')
      this.emit('finish')
      if (this[CLOSED])
        this.emit('close')
      this[EMITTING_END] = false
    }
  }

  emit (ev, data) {
    // error and close are only events allowed after calling destroy()
    if (ev !== 'error' && ev !== 'close' && ev !== DESTROYED && this[DESTROYED])
      return
    else if (ev === 'data') {
      if (!data)
        return

      if (this.pipes.length)
        this.pipes.forEach(p =>
          p.dest.write(data) === false && this.pause())
    } else if (ev === 'end') {
      // only actual end gets this treatment
      if (this[EMITTED_END] === true)
        return

      this[EMITTED_END] = true
      this.readable = false

      if (this[DECODER]) {
        data = this[DECODER].end()
        if (data) {
          this.pipes.forEach(p => p.dest.write(data))
          super.emit('data', data)
        }
      }

      this.pipes.forEach(p => {
        p.dest.removeListener('drain', p.ondrain)
        if (p.opts.end)
          p.dest.end()
      })
    } else if (ev === 'close') {
      this[CLOSED] = true
      // don't emit close before 'end' and 'finish'
      if (!this[EMITTED_END] && !this[DESTROYED])
        return
    }

    // TODO: replace with a spread operator when Node v4 support drops
    const args = new Array(arguments.length)
    args[0] = ev
    args[1] = data
    if (arguments.length > 2) {
      for (let i = 2; i < arguments.length; i++) {
        args[i] = arguments[i]
      }
    }

    try {
      return super.emit.apply(this, args)
    } finally {
      if (!isEndish(ev))
        this[MAYBE_EMIT_END]()
      else
        this.removeAllListeners(ev)
    }
  }

  // const all = await stream.collect()
  collect () {
    const buf = []
    buf.dataLength = 0
    this.on('data', c => {
      buf.push(c)
      buf.dataLength += c.length
    })
    return this.promise().then(() => buf)
  }

  // const data = await stream.concat()
  concat () {
    return this[OBJECTMODE]
      ? Promise.reject(new Error('cannot concat in objectMode'))
      : this.collect().then(buf =>
          this[OBJECTMODE]
            ? Promise.reject(new Error('cannot concat in objectMode'))
            : this[ENCODING] ? buf.join('') : B.concat(buf, buf.dataLength))
  }

  // stream.promise().then(() => done, er => emitted error)
  promise () {
    return new Promise((resolve, reject) => {
      this.on(DESTROYED, () => reject(new Error('stream destroyed')))
      this.on('end', () => resolve())
      this.on('error', er => reject(er))
    })
  }

  // for await (let chunk of stream)
  [ASYNCITERATOR] () {
    const next = () => {
      const res = this.read()
      if (res !== null)
        return Promise.resolve({ done: false, value: res })

      if (this[EOF])
        return Promise.resolve({ done: true })

      let resolve = null
      let reject = null
      const onerr = er => {
        this.removeListener('data', ondata)
        this.removeListener('end', onend)
        reject(er)
      }
      const ondata = value => {
        this.removeListener('error', onerr)
        this.removeListener('end', onend)
        this.pause()
        resolve({ value: value, done: !!this[EOF] })
      }
      const onend = () => {
        this.removeListener('error', onerr)
        this.removeListener('data', ondata)
        resolve({ done: true })
      }
      const ondestroy = () => onerr(new Error('stream destroyed'))
      return new Promise((res, rej) => {
        reject = rej
        resolve = res
        this.once(DESTROYED, ondestroy)
        this.once('error', onerr)
        this.once('end', onend)
        this.once('data', ondata)
      })
    }

    return { next }
  }

  // for (let chunk of stream)
  [ITERATOR] () {
    const next = () => {
      const value = this.read()
      const done = value === null
      return { value, done }
    }
    return { next }
  }

  destroy (er) {
    if (this[DESTROYED]) {
      if (er)
        this.emit('error', er)
      else
        this.emit(DESTROYED)
      return this
    }

    this[DESTROYED] = true

    // throw away all buffered data, it's never coming out
    this.buffer = new Yallist()
    this[BUFFERLENGTH] = 0

    if (typeof this.close === 'function' && !this[CLOSED])
      this.close()

    if (er)
      this.emit('error', er)
    else // if no error to emit, still reject pending promises
      this.emit(DESTROYED)

    return this
  }

  static isStream (s) {
    return !!s && (s instanceof Minipass || s instanceof EE && (
      typeof s.pipe === 'function' || // readable
      (typeof s.write === 'function' && typeof s.end === 'function') // writable
    ))
  }
}

Youez - 2016 - github.com/yon3zu
LinuXploit