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Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\nvar R = typeof Reflect === 'object' ? Reflect : null\nvar ReflectApply = R && typeof R.apply === 'function'\n  ? R.apply\n  : function ReflectApply(target, receiver, args) {\n    return Function.prototype.apply.call(target, receiver, args);\n  }\n\nvar ReflectOwnKeys\nif (R && typeof R.ownKeys === 'function') {\n  ReflectOwnKeys = R.ownKeys\n} else if (Object.getOwnPropertySymbols) {\n  ReflectOwnKeys = function ReflectOwnKeys(target) {\n    return Object.getOwnPropertyNames(target)\n      .concat(Object.getOwnPropertySymbols(target));\n  };\n} else {\n  ReflectOwnKeys = function ReflectOwnKeys(target) {\n    return Object.getOwnPropertyNames(target);\n  };\n}\n\nfunction ProcessEmitWarning(warning) {\n  if (console && console.warn) console.warn(warning);\n}\n\nvar NumberIsNaN = Number.isNaN || function NumberIsNaN(value) {\n  return value !== value;\n}\n\nfunction EventEmitter() {\n  EventEmitter.init.call(this);\n}\nmodule.exports = EventEmitter;\nmodule.exports.once = once;\n\n// Backwards-compat with node 0.10.x\nEventEmitter.EventEmitter = EventEmitter;\n\nEventEmitter.prototype._events = undefined;\nEventEmitter.prototype._eventsCount = 0;\nEventEmitter.prototype._maxListeners = undefined;\n\n// By default EventEmitters will print a warning if more than 10 listeners are\n// added to it. This is a useful default which helps finding memory leaks.\nvar defaultMaxListeners = 10;\n\nfunction checkListener(listener) {\n  if (typeof listener !== 'function') {\n    throw new TypeError('The \"listener\" argument must be of type Function. Received type ' + typeof listener);\n  }\n}\n\nObject.defineProperty(EventEmitter, 'defaultMaxListeners', {\n  enumerable: true,\n  get: function() {\n    return defaultMaxListeners;\n  },\n  set: function(arg) {\n    if (typeof arg !== 'number' || arg < 0 || NumberIsNaN(arg)) {\n      throw new RangeError('The value of \"defaultMaxListeners\" is out of range. It must be a non-negative number. Received ' + arg + '.');\n    }\n    defaultMaxListeners = arg;\n  }\n});\n\nEventEmitter.init = function() {\n\n  if (this._events === undefined ||\n      this._events === Object.getPrototypeOf(this)._events) {\n    this._events = Object.create(null);\n    this._eventsCount = 0;\n  }\n\n  this._maxListeners = this._maxListeners || undefined;\n};\n\n// Obviously not all Emitters should be limited to 10. This function allows\n// that to be increased. Set to zero for unlimited.\nEventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {\n  if (typeof n !== 'number' || n < 0 || NumberIsNaN(n)) {\n    throw new RangeError('The value of \"n\" is out of range. It must be a non-negative number. Received ' + n + '.');\n  }\n  this._maxListeners = n;\n  return this;\n};\n\nfunction _getMaxListeners(that) {\n  if (that._maxListeners === undefined)\n    return EventEmitter.defaultMaxListeners;\n  return that._maxListeners;\n}\n\nEventEmitter.prototype.getMaxListeners = function getMaxListeners() {\n  return _getMaxListeners(this);\n};\n\nEventEmitter.prototype.emit = function emit(type) {\n  var args = [];\n  for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);\n  var doError = (type === 'error');\n\n  var events = this._events;\n  if (events !== undefined)\n    doError = (doError && events.error === undefined);\n  else if (!doError)\n    return false;\n\n  // If there is no 'error' event listener then throw.\n  if (doError) {\n    var er;\n    if (args.length > 0)\n      er = args[0];\n    if (er instanceof Error) {\n      // Note: The comments on the `throw` lines are intentional, they show\n      // up in Node's output if this results in an unhandled exception.\n      throw er; // Unhandled 'error' event\n    }\n    // At least give some kind of context to the user\n    var err = new Error('Unhandled error.' + (er ? ' (' + er.message + ')' : ''));\n    err.context = er;\n    throw err; // Unhandled 'error' event\n  }\n\n  var handler = events[type];\n\n  if (handler === undefined)\n    return false;\n\n  if (typeof handler === 'function') {\n    ReflectApply(handler, this, args);\n  } else {\n    var len = handler.length;\n    var listeners = arrayClone(handler, len);\n    for (var i = 0; i < len; ++i)\n      ReflectApply(listeners[i], this, args);\n  }\n\n  return true;\n};\n\nfunction _addListener(target, type, listener, prepend) {\n  var m;\n  var events;\n  var existing;\n\n  checkListener(listener);\n\n  events = target._events;\n  if (events === undefined) {\n    events = target._events = Object.create(null);\n    target._eventsCount = 0;\n  } else {\n    // To avoid recursion in the case that type === \"newListener\"! Before\n    // adding it to the listeners, first emit \"newListener\".\n    if (events.newListener !== undefined) {\n      target.emit('newListener', type,\n                  listener.listener ? listener.listener : listener);\n\n      // Re-assign `events` because a newListener handler could have caused the\n      // this._events to be assigned to a new object\n      events = target._events;\n    }\n    existing = events[type];\n  }\n\n  if (existing === undefined) {\n    // Optimize the case of one listener. Don't need the extra array object.\n    existing = events[type] = listener;\n    ++target._eventsCount;\n  } else {\n    if (typeof existing === 'function') {\n      // Adding the second element, need to change to array.\n      existing = events[type] =\n        prepend ? [listener, existing] : [existing, listener];\n      // If we've already got an array, just append.\n    } else if (prepend) {\n      existing.unshift(listener);\n    } else {\n      existing.push(listener);\n    }\n\n    // Check for listener leak\n    m = _getMaxListeners(target);\n    if (m > 0 && existing.length > m && !existing.warned) {\n      existing.warned = true;\n      // No error code for this since it is a Warning\n      // eslint-disable-next-line no-restricted-syntax\n      var w = new Error('Possible EventEmitter memory leak detected. ' +\n                          existing.length + ' ' + String(type) + ' listeners ' +\n                          'added. Use emitter.setMaxListeners() to ' +\n                          'increase limit');\n      w.name = 'MaxListenersExceededWarning';\n      w.emitter = target;\n      w.type = type;\n      w.count = existing.length;\n      ProcessEmitWarning(w);\n    }\n  }\n\n  return target;\n}\n\nEventEmitter.prototype.addListener = function addListener(type, listener) {\n  return _addListener(this, type, listener, false);\n};\n\nEventEmitter.prototype.on = EventEmitter.prototype.addListener;\n\nEventEmitter.prototype.prependListener =\n    function prependListener(type, listener) {\n      return _addListener(this, type, listener, true);\n    };\n\nfunction onceWrapper() {\n  if (!this.fired) {\n    this.target.removeListener(this.type, this.wrapFn);\n    this.fired = true;\n    if (arguments.length === 0)\n      return this.listener.call(this.target);\n    return this.listener.apply(this.target, arguments);\n  }\n}\n\nfunction _onceWrap(target, type, listener) {\n  var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };\n  var wrapped = onceWrapper.bind(state);\n  wrapped.listener = listener;\n  state.wrapFn = wrapped;\n  return wrapped;\n}\n\nEventEmitter.prototype.once = function once(type, listener) {\n  checkListener(listener);\n  this.on(type, _onceWrap(this, type, listener));\n  return this;\n};\n\nEventEmitter.prototype.prependOnceListener =\n    function prependOnceListener(type, listener) {\n      checkListener(listener);\n      this.prependListener(type, _onceWrap(this, type, listener));\n      return this;\n    };\n\n// Emits a 'removeListener' event if and only if the listener was removed.\nEventEmitter.prototype.removeListener =\n    function removeListener(type, listener) {\n      var list, events, position, i, originalListener;\n\n      checkListener(listener);\n\n      events = this._events;\n      if (events === undefined)\n        return this;\n\n      list = events[type];\n      if (list === undefined)\n        return this;\n\n      if (list === listener || list.listener === listener) {\n        if (--this._eventsCount === 0)\n          this._events = Object.create(null);\n        else {\n          delete events[type];\n          if (events.removeListener)\n            this.emit('removeListener', type, list.listener || listener);\n        }\n      } else if (typeof list !== 'function') {\n        position = -1;\n\n        for (i = list.length - 1; i >= 0; i--) {\n          if (list[i] === listener || list[i].listener === listener) {\n            originalListener = list[i].listener;\n            position = i;\n            break;\n          }\n        }\n\n        if (position < 0)\n          return this;\n\n        if (position === 0)\n          list.shift();\n        else {\n          spliceOne(list, position);\n        }\n\n        if (list.length === 1)\n          events[type] = list[0];\n\n        if (events.removeListener !== undefined)\n          this.emit('removeListener', type, originalListener || listener);\n      }\n\n      return this;\n    };\n\nEventEmitter.prototype.off = EventEmitter.prototype.removeListener;\n\nEventEmitter.prototype.removeAllListeners =\n    function removeAllListeners(type) {\n      var listeners, events, i;\n\n      events = this._events;\n      if (events === undefined)\n        return this;\n\n      // not listening for removeListener, no need to emit\n      if (events.removeListener === undefined) {\n        if (arguments.length === 0) {\n          this._events = Object.create(null);\n          this._eventsCount = 0;\n        } else if (events[type] !== undefined) {\n          if (--this._eventsCount === 0)\n            this._events = Object.create(null);\n          else\n            delete events[type];\n        }\n        return this;\n      }\n\n      // emit removeListener for all listeners on all events\n      if (arguments.length === 0) {\n        var keys = Object.keys(events);\n        var key;\n        for (i = 0; i < keys.length; ++i) {\n          key = keys[i];\n          if (key === 'removeListener') continue;\n          this.removeAllListeners(key);\n        }\n        this.removeAllListeners('removeListener');\n        this._events = Object.create(null);\n        this._eventsCount = 0;\n        return this;\n      }\n\n      listeners = events[type];\n\n      if (typeof listeners === 'function') {\n        this.removeListener(type, listeners);\n      } else if (listeners !== undefined) {\n        // LIFO order\n        for (i = listeners.length - 1; i >= 0; i--) {\n          this.removeListener(type, listeners[i]);\n        }\n      }\n\n      return this;\n    };\n\nfunction _listeners(target, type, unwrap) {\n  var events = target._events;\n\n  if (events === undefined)\n    return [];\n\n  var evlistener = events[type];\n  if (evlistener === undefined)\n    return [];\n\n  if (typeof evlistener === 'function')\n    return unwrap ? [evlistener.listener || evlistener] : [evlistener];\n\n  return unwrap ?\n    unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);\n}\n\nEventEmitter.prototype.listeners = function listeners(type) {\n  return _listeners(this, type, true);\n};\n\nEventEmitter.prototype.rawListeners = function rawListeners(type) {\n  return _listeners(this, type, false);\n};\n\nEventEmitter.listenerCount = function(emitter, type) {\n  if (typeof emitter.listenerCount === 'function') {\n    return emitter.listenerCount(type);\n  } else {\n    return listenerCount.call(emitter, type);\n  }\n};\n\nEventEmitter.prototype.listenerCount = listenerCount;\nfunction listenerCount(type) {\n  var events = this._events;\n\n  if (events !== undefined) {\n    var evlistener = events[type];\n\n    if (typeof evlistener === 'function') {\n      return 1;\n    } else if (evlistener !== undefined) {\n      return evlistener.length;\n    }\n  }\n\n  return 0;\n}\n\nEventEmitter.prototype.eventNames = function eventNames() {\n  return this._eventsCount > 0 ? ReflectOwnKeys(this._events) : [];\n};\n\nfunction arrayClone(arr, n) {\n  var copy = new Array(n);\n  for (var i = 0; i < n; ++i)\n    copy[i] = arr[i];\n  return copy;\n}\n\nfunction spliceOne(list, index) {\n  for (; index + 1 < list.length; index++)\n    list[index] = list[index + 1];\n  list.pop();\n}\n\nfunction unwrapListeners(arr) {\n  var ret = new Array(arr.length);\n  for (var i = 0; i < ret.length; ++i) {\n    ret[i] = arr[i].listener || arr[i];\n  }\n  return ret;\n}\n\nfunction once(emitter, name) {\n  return new Promise(function (resolve, reject) {\n    function errorListener(err) {\n      emitter.removeListener(name, resolver);\n      reject(err);\n    }\n\n    function resolver() {\n      if (typeof emitter.removeListener === 'function') {\n        emitter.removeListener('error', errorListener);\n      }\n      resolve([].slice.call(arguments));\n    };\n\n    eventTargetAgnosticAddListener(emitter, name, resolver, { once: true });\n    if (name !== 'error') {\n      addErrorHandlerIfEventEmitter(emitter, errorListener, { once: true });\n    }\n  });\n}\n\nfunction addErrorHandlerIfEventEmitter(emitter, handler, flags) {\n  if (typeof emitter.on === 'function') {\n    eventTargetAgnosticAddListener(emitter, 'error', handler, flags);\n  }\n}\n\nfunction eventTargetAgnosticAddListener(emitter, name, listener, flags) {\n  if (typeof emitter.on === 'function') {\n    if (flags.once) {\n      emitter.once(name, listener);\n    } else {\n      emitter.on(name, listener);\n    }\n  } else if (typeof emitter.addEventListener === 'function') {\n    // EventTarget does not have `error` event semantics like Node\n    // EventEmitters, we do not listen for `error` events here.\n    emitter.addEventListener(name, function wrapListener(arg) {\n      // IE does not have builtin `{ once: true }` support so we\n      // have to do it manually.\n      if (flags.once) {\n        emitter.removeEventListener(name, wrapListener);\n      }\n      listener(arg);\n    });\n  } else {\n    throw new TypeError('The \"emitter\" argument must be of type EventEmitter. Received type ' + typeof emitter);\n  }\n}\n","'use strict';\n\nfunction _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; }\n\nvar codes = {};\n\nfunction createErrorType(code, message, Base) {\n  if (!Base) {\n    Base = Error;\n  }\n\n  function getMessage(arg1, arg2, arg3) {\n    if (typeof message === 'string') {\n      return message;\n    } else {\n      return message(arg1, arg2, arg3);\n    }\n  }\n\n  var NodeError =\n  /*#__PURE__*/\n  function (_Base) {\n    _inheritsLoose(NodeError, _Base);\n\n    function NodeError(arg1, arg2, arg3) {\n      return _Base.call(this, getMessage(arg1, arg2, arg3)) || this;\n    }\n\n    return NodeError;\n  }(Base);\n\n  NodeError.prototype.name = Base.name;\n  NodeError.prototype.code = code;\n  codes[code] = NodeError;\n} // https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js\n\n\nfunction oneOf(expected, thing) {\n  if (Array.isArray(expected)) {\n    var len = expected.length;\n    expected = expected.map(function (i) {\n      return String(i);\n    });\n\n    if (len > 2) {\n      return \"one of \".concat(thing, \" \").concat(expected.slice(0, len - 1).join(', '), \", or \") + expected[len - 1];\n    } else if (len === 2) {\n      return \"one of \".concat(thing, \" \").concat(expected[0], \" or \").concat(expected[1]);\n    } else {\n      return \"of \".concat(thing, \" \").concat(expected[0]);\n    }\n  } else {\n    return \"of \".concat(thing, \" \").concat(String(expected));\n  }\n} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith\n\n\nfunction startsWith(str, search, pos) {\n  return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search;\n} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith\n\n\nfunction endsWith(str, search, this_len) {\n  if (this_len === undefined || this_len > str.length) {\n    this_len = str.length;\n  }\n\n  return str.substring(this_len - search.length, this_len) === search;\n} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes\n\n\nfunction includes(str, search, start) {\n  if (typeof start !== 'number') {\n    start = 0;\n  }\n\n  if (start + search.length > str.length) {\n    return false;\n  } else {\n    return str.indexOf(search, start) !== -1;\n  }\n}\n\ncreateErrorType('ERR_INVALID_OPT_VALUE', function (name, value) {\n  return 'The value \"' + value + '\" is invalid for option \"' + name + '\"';\n}, TypeError);\ncreateErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) {\n  // determiner: 'must be' or 'must not be'\n  var determiner;\n\n  if (typeof expected === 'string' && startsWith(expected, 'not ')) {\n    determiner = 'must not be';\n    expected = expected.replace(/^not /, '');\n  } else {\n    determiner = 'must be';\n  }\n\n  var msg;\n\n  if (endsWith(name, ' argument')) {\n    // For cases like 'first argument'\n    msg = \"The \".concat(name, \" \").concat(determiner, \" \").concat(oneOf(expected, 'type'));\n  } else {\n    var type = includes(name, '.') ? 'property' : 'argument';\n    msg = \"The \\\"\".concat(name, \"\\\" \").concat(type, \" \").concat(determiner, \" \").concat(oneOf(expected, 'type'));\n  }\n\n  msg += \". Received type \".concat(typeof actual);\n  return msg;\n}, TypeError);\ncreateErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF');\ncreateErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) {\n  return 'The ' + name + ' method is not implemented';\n});\ncreateErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close');\ncreateErrorType('ERR_STREAM_DESTROYED', function (name) {\n  return 'Cannot call ' + name + ' after a stream was destroyed';\n});\ncreateErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times');\ncreateErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable');\ncreateErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end');\ncreateErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError);\ncreateErrorType('ERR_UNKNOWN_ENCODING', function (arg) {\n  return 'Unknown encoding: ' + arg;\n}, TypeError);\ncreateErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event');\nmodule.exports.codes = codes;\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n// a duplex stream is just a stream that is both readable and writable.\n// Since JS doesn't have multiple prototypal inheritance, this class\n// prototypally inherits from Readable, and then parasitically from\n// Writable.\n'use strict';\n/*<replacement>*/\n\nvar objectKeys = Object.keys || function (obj) {\n  var keys = [];\n\n  for (var key in obj) {\n    keys.push(key);\n  }\n\n  return keys;\n};\n/*</replacement>*/\n\n\nmodule.exports = Duplex;\n\nvar Readable = require('./_stream_readable');\n\nvar Writable = require('./_stream_writable');\n\nrequire('inherits')(Duplex, Readable);\n\n{\n  // Allow the keys array to be GC'ed.\n  var keys = objectKeys(Writable.prototype);\n\n  for (var v = 0; v < keys.length; v++) {\n    var method = keys[v];\n    if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];\n  }\n}\n\nfunction Duplex(options) {\n  if (!(this instanceof Duplex)) return new Duplex(options);\n  Readable.call(this, options);\n  Writable.call(this, options);\n  this.allowHalfOpen = true;\n\n  if (options) {\n    if (options.readable === false) this.readable = false;\n    if (options.writable === false) this.writable = false;\n\n    if (options.allowHalfOpen === false) {\n      this.allowHalfOpen = false;\n      this.once('end', onend);\n    }\n  }\n}\n\nObject.defineProperty(Duplex.prototype, 'writableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState.highWaterMark;\n  }\n});\nObject.defineProperty(Duplex.prototype, 'writableBuffer', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState && this._writableState.getBuffer();\n  }\n});\nObject.defineProperty(Duplex.prototype, 'writableLength', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState.length;\n  }\n}); // the no-half-open enforcer\n\nfunction onend() {\n  // If the writable side ended, then we're ok.\n  if (this._writableState.ended) return; // no more data can be written.\n  // But allow more writes to happen in this tick.\n\n  process.nextTick(onEndNT, this);\n}\n\nfunction onEndNT(self) {\n  self.end();\n}\n\nObject.defineProperty(Duplex.prototype, 'destroyed', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    if (this._readableState === undefined || this._writableState === undefined) {\n      return false;\n    }\n\n    return this._readableState.destroyed && this._writableState.destroyed;\n  },\n  set: function set(value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (this._readableState === undefined || this._writableState === undefined) {\n      return;\n    } // backward compatibility, the user is explicitly\n    // managing destroyed\n\n\n    this._readableState.destroyed = value;\n    this._writableState.destroyed = value;\n  }\n});","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n// a passthrough stream.\n// basically just the most minimal sort of Transform stream.\n// Every written chunk gets output as-is.\n'use strict';\n\nmodule.exports = PassThrough;\n\nvar Transform = require('./_stream_transform');\n\nrequire('inherits')(PassThrough, Transform);\n\nfunction PassThrough(options) {\n  if (!(this instanceof PassThrough)) return new PassThrough(options);\n  Transform.call(this, options);\n}\n\nPassThrough.prototype._transform = function (chunk, encoding, cb) {\n  cb(null, chunk);\n};","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n'use strict';\n\nmodule.exports = Readable;\n/*<replacement>*/\n\nvar Duplex;\n/*</replacement>*/\n\nReadable.ReadableState = ReadableState;\n/*<replacement>*/\n\nvar EE = require('events').EventEmitter;\n\nvar EElistenerCount = function EElistenerCount(emitter, type) {\n  return emitter.listeners(type).length;\n};\n/*</replacement>*/\n\n/*<replacement>*/\n\n\nvar Stream = require('./internal/streams/stream');\n/*</replacement>*/\n\n\nvar Buffer = require('buffer').Buffer;\n\nvar OurUint8Array = global.Uint8Array || function () {};\n\nfunction _uint8ArrayToBuffer(chunk) {\n  return Buffer.from(chunk);\n}\n\nfunction _isUint8Array(obj) {\n  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;\n}\n/*<replacement>*/\n\n\nvar debugUtil = require('util');\n\nvar debug;\n\nif (debugUtil && debugUtil.debuglog) {\n  debug = debugUtil.debuglog('stream');\n} else {\n  debug = function debug() {};\n}\n/*</replacement>*/\n\n\nvar BufferList = require('./internal/streams/buffer_list');\n\nvar destroyImpl = require('./internal/streams/destroy');\n\nvar _require = require('./internal/streams/state'),\n    getHighWaterMark = _require.getHighWaterMark;\n\nvar _require$codes = require('../errors').codes,\n    ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,\n    ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF,\n    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,\n    ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT; // Lazy loaded to improve the startup performance.\n\n\nvar StringDecoder;\nvar createReadableStreamAsyncIterator;\nvar from;\n\nrequire('inherits')(Readable, Stream);\n\nvar errorOrDestroy = destroyImpl.errorOrDestroy;\nvar kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];\n\nfunction prependListener(emitter, event, fn) {\n  // Sadly this is not cacheable as some libraries bundle their own\n  // event emitter implementation with them.\n  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\n  // userland ones.  NEVER DO THIS. This is here only because this code needs\n  // to continue to work with older versions of Node.js that do not include\n  // the prependListener() method. The goal is to eventually remove this hack.\n\n  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]];\n}\n\nfunction ReadableState(options, stream, isDuplex) {\n  Duplex = Duplex || require('./_stream_duplex');\n  options = options || {}; // Duplex streams are both readable and writable, but share\n  // the same options object.\n  // However, some cases require setting options to different\n  // values for the readable and the writable sides of the duplex stream.\n  // These options can be provided separately as readableXXX and writableXXX.\n\n  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag. Used to make read(n) ignore n and to\n  // make all the buffer merging and length checks go away\n\n  this.objectMode = !!options.objectMode;\n  if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; // the point at which it stops calling _read() to fill the buffer\n  // Note: 0 is a valid value, means \"don't call _read preemptively ever\"\n\n  this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex); // A linked list is used to store data chunks instead of an array because the\n  // linked list can remove elements from the beginning faster than\n  // array.shift()\n\n  this.buffer = new BufferList();\n  this.length = 0;\n  this.pipes = null;\n  this.pipesCount = 0;\n  this.flowing = null;\n  this.ended = false;\n  this.endEmitted = false;\n  this.reading = false; // a flag to be able to tell if the event 'readable'/'data' is emitted\n  // immediately, or on a later tick.  We set this to true at first, because\n  // any actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first read call.\n\n  this.sync = true; // whenever we return null, then we set a flag to say\n  // that we're awaiting a 'readable' event emission.\n\n  this.needReadable = false;\n  this.emittedReadable = false;\n  this.readableListening = false;\n  this.resumeScheduled = false;\n  this.paused = true; // Should close be emitted on destroy. Defaults to true.\n\n  this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'end' (and potentially 'finish')\n\n  this.autoDestroy = !!options.autoDestroy; // has it been destroyed\n\n  this.destroyed = false; // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n\n  this.defaultEncoding = options.defaultEncoding || 'utf8'; // the number of writers that are awaiting a drain event in .pipe()s\n\n  this.awaitDrain = 0; // if true, a maybeReadMore has been scheduled\n\n  this.readingMore = false;\n  this.decoder = null;\n  this.encoding = null;\n\n  if (options.encoding) {\n    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n    this.decoder = new StringDecoder(options.encoding);\n    this.encoding = options.encoding;\n  }\n}\n\nfunction Readable(options) {\n  Duplex = Duplex || require('./_stream_duplex');\n  if (!(this instanceof Readable)) return new Readable(options); // Checking for a Stream.Duplex instance is faster here instead of inside\n  // the ReadableState constructor, at least with V8 6.5\n\n  var isDuplex = this instanceof Duplex;\n  this._readableState = new ReadableState(options, this, isDuplex); // legacy\n\n  this.readable = true;\n\n  if (options) {\n    if (typeof options.read === 'function') this._read = options.read;\n    if (typeof options.destroy === 'function') this._destroy = options.destroy;\n  }\n\n  Stream.call(this);\n}\n\nObject.defineProperty(Readable.prototype, 'destroyed', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    if (this._readableState === undefined) {\n      return false;\n    }\n\n    return this._readableState.destroyed;\n  },\n  set: function set(value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (!this._readableState) {\n      return;\n    } // backward compatibility, the user is explicitly\n    // managing destroyed\n\n\n    this._readableState.destroyed = value;\n  }\n});\nReadable.prototype.destroy = destroyImpl.destroy;\nReadable.prototype._undestroy = destroyImpl.undestroy;\n\nReadable.prototype._destroy = function (err, cb) {\n  cb(err);\n}; // Manually shove something into the read() buffer.\n// This returns true if the highWaterMark has not been hit yet,\n// similar to how Writable.write() returns true if you should\n// write() some more.\n\n\nReadable.prototype.push = function (chunk, encoding) {\n  var state = this._readableState;\n  var skipChunkCheck;\n\n  if (!state.objectMode) {\n    if (typeof chunk === 'string') {\n      encoding = encoding || state.defaultEncoding;\n\n      if (encoding !== state.encoding) {\n        chunk = Buffer.from(chunk, encoding);\n        encoding = '';\n      }\n\n      skipChunkCheck = true;\n    }\n  } else {\n    skipChunkCheck = true;\n  }\n\n  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);\n}; // Unshift should *always* be something directly out of read()\n\n\nReadable.prototype.unshift = function (chunk) {\n  return readableAddChunk(this, chunk, null, true, false);\n};\n\nfunction readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {\n  debug('readableAddChunk', chunk);\n  var state = stream._readableState;\n\n  if (chunk === null) {\n    state.reading = false;\n    onEofChunk(stream, state);\n  } else {\n    var er;\n    if (!skipChunkCheck) er = chunkInvalid(state, chunk);\n\n    if (er) {\n      errorOrDestroy(stream, er);\n    } else if (state.objectMode || chunk && chunk.length > 0) {\n      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {\n        chunk = _uint8ArrayToBuffer(chunk);\n      }\n\n      if (addToFront) {\n        if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true);\n      } else if (state.ended) {\n        errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());\n      } else if (state.destroyed) {\n        return false;\n      } else {\n        state.reading = false;\n\n        if (state.decoder && !encoding) {\n          chunk = state.decoder.write(chunk);\n          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);\n        } else {\n          addChunk(stream, state, chunk, false);\n        }\n      }\n    } else if (!addToFront) {\n      state.reading = false;\n      maybeReadMore(stream, state);\n    }\n  } // We can push more data if we are below the highWaterMark.\n  // Also, if we have no data yet, we can stand some more bytes.\n  // This is to work around cases where hwm=0, such as the repl.\n\n\n  return !state.ended && (state.length < state.highWaterMark || state.length === 0);\n}\n\nfunction addChunk(stream, state, chunk, addToFront) {\n  if (state.flowing && state.length === 0 && !state.sync) {\n    state.awaitDrain = 0;\n    stream.emit('data', chunk);\n  } else {\n    // update the buffer info.\n    state.length += state.objectMode ? 1 : chunk.length;\n    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);\n    if (state.needReadable) emitReadable(stream);\n  }\n\n  maybeReadMore(stream, state);\n}\n\nfunction chunkInvalid(state, chunk) {\n  var er;\n\n  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {\n    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk);\n  }\n\n  return er;\n}\n\nReadable.prototype.isPaused = function () {\n  return this._readableState.flowing === false;\n}; // backwards compatibility.\n\n\nReadable.prototype.setEncoding = function (enc) {\n  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;\n  var decoder = new StringDecoder(enc);\n  this._readableState.decoder = decoder; // If setEncoding(null), decoder.encoding equals utf8\n\n  this._readableState.encoding = this._readableState.decoder.encoding; // Iterate over current buffer to convert already stored Buffers:\n\n  var p = this._readableState.buffer.head;\n  var content = '';\n\n  while (p !== null) {\n    content += decoder.write(p.data);\n    p = p.next;\n  }\n\n  this._readableState.buffer.clear();\n\n  if (content !== '') this._readableState.buffer.push(content);\n  this._readableState.length = content.length;\n  return this;\n}; // Don't raise the hwm > 1GB\n\n\nvar MAX_HWM = 0x40000000;\n\nfunction computeNewHighWaterMark(n) {\n  if (n >= MAX_HWM) {\n    // TODO(ronag): Throw ERR_VALUE_OUT_OF_RANGE.\n    n = MAX_HWM;\n  } else {\n    // Get the next highest power of 2 to prevent increasing hwm excessively in\n    // tiny amounts\n    n--;\n    n |= n >>> 1;\n    n |= n >>> 2;\n    n |= n >>> 4;\n    n |= n >>> 8;\n    n |= n >>> 16;\n    n++;\n  }\n\n  return n;\n} // This function is designed to be inlinable, so please take care when making\n// changes to the function body.\n\n\nfunction howMuchToRead(n, state) {\n  if (n <= 0 || state.length === 0 && state.ended) return 0;\n  if (state.objectMode) return 1;\n\n  if (n !== n) {\n    // Only flow one buffer at a time\n    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;\n  } // If we're asking for more than the current hwm, then raise the hwm.\n\n\n  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);\n  if (n <= state.length) return n; // Don't have enough\n\n  if (!state.ended) {\n    state.needReadable = true;\n    return 0;\n  }\n\n  return state.length;\n} // you can override either this method, or the async _read(n) below.\n\n\nReadable.prototype.read = function (n) {\n  debug('read', n);\n  n = parseInt(n, 10);\n  var state = this._readableState;\n  var nOrig = n;\n  if (n !== 0) state.emittedReadable = false; // if we're doing read(0) to trigger a readable event, but we\n  // already have a bunch of data in the buffer, then just trigger\n  // the 'readable' event and move on.\n\n  if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) {\n    debug('read: emitReadable', state.length, state.ended);\n    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);\n    return null;\n  }\n\n  n = howMuchToRead(n, state); // if we've ended, and we're now clear, then finish it up.\n\n  if (n === 0 && state.ended) {\n    if (state.length === 0) endReadable(this);\n    return null;\n  } // All the actual chunk generation logic needs to be\n  // *below* the call to _read.  The reason is that in certain\n  // synthetic stream cases, such as passthrough streams, _read\n  // may be a completely synchronous operation which may change\n  // the state of the read buffer, providing enough data when\n  // before there was *not* enough.\n  //\n  // So, the steps are:\n  // 1. Figure out what the state of things will be after we do\n  // a read from the buffer.\n  //\n  // 2. If that resulting state will trigger a _read, then call _read.\n  // Note that this may be asynchronous, or synchronous.  Yes, it is\n  // deeply ugly to write APIs this way, but that still doesn't mean\n  // that the Readable class should behave improperly, as streams are\n  // designed to be sync/async agnostic.\n  // Take note if the _read call is sync or async (ie, if the read call\n  // has returned yet), so that we know whether or not it's safe to emit\n  // 'readable' etc.\n  //\n  // 3. Actually pull the requested chunks out of the buffer and return.\n  // if we need a readable event, then we need to do some reading.\n\n\n  var doRead = state.needReadable;\n  debug('need readable', doRead); // if we currently have less than the highWaterMark, then also read some\n\n  if (state.length === 0 || state.length - n < state.highWaterMark) {\n    doRead = true;\n    debug('length less than watermark', doRead);\n  } // however, if we've ended, then there's no point, and if we're already\n  // reading, then it's unnecessary.\n\n\n  if (state.ended || state.reading) {\n    doRead = false;\n    debug('reading or ended', doRead);\n  } else if (doRead) {\n    debug('do read');\n    state.reading = true;\n    state.sync = true; // if the length is currently zero, then we *need* a readable event.\n\n    if (state.length === 0) state.needReadable = true; // call internal read method\n\n    this._read(state.highWaterMark);\n\n    state.sync = false; // If _read pushed data synchronously, then `reading` will be false,\n    // and we need to re-evaluate how much data we can return to the user.\n\n    if (!state.reading) n = howMuchToRead(nOrig, state);\n  }\n\n  var ret;\n  if (n > 0) ret = fromList(n, state);else ret = null;\n\n  if (ret === null) {\n    state.needReadable = state.length <= state.highWaterMark;\n    n = 0;\n  } else {\n    state.length -= n;\n    state.awaitDrain = 0;\n  }\n\n  if (state.length === 0) {\n    // If we have nothing in the buffer, then we want to know\n    // as soon as we *do* get something into the buffer.\n    if (!state.ended) state.needReadable = true; // If we tried to read() past the EOF, then emit end on the next tick.\n\n    if (nOrig !== n && state.ended) endReadable(this);\n  }\n\n  if (ret !== null) this.emit('data', ret);\n  return ret;\n};\n\nfunction onEofChunk(stream, state) {\n  debug('onEofChunk');\n  if (state.ended) return;\n\n  if (state.decoder) {\n    var chunk = state.decoder.end();\n\n    if (chunk && chunk.length) {\n      state.buffer.push(chunk);\n      state.length += state.objectMode ? 1 : chunk.length;\n    }\n  }\n\n  state.ended = true;\n\n  if (state.sync) {\n    // if we are sync, wait until next tick to emit the data.\n    // Otherwise we risk emitting data in the flow()\n    // the readable code triggers during a read() call\n    emitReadable(stream);\n  } else {\n    // emit 'readable' now to make sure it gets picked up.\n    state.needReadable = false;\n\n    if (!state.emittedReadable) {\n      state.emittedReadable = true;\n      emitReadable_(stream);\n    }\n  }\n} // Don't emit readable right away in sync mode, because this can trigger\n// another read() call => stack overflow.  This way, it might trigger\n// a nextTick recursion warning, but that's not so bad.\n\n\nfunction emitReadable(stream) {\n  var state = stream._readableState;\n  debug('emitReadable', state.needReadable, state.emittedReadable);\n  state.needReadable = false;\n\n  if (!state.emittedReadable) {\n    debug('emitReadable', state.flowing);\n    state.emittedReadable = true;\n    process.nextTick(emitReadable_, stream);\n  }\n}\n\nfunction emitReadable_(stream) {\n  var state = stream._readableState;\n  debug('emitReadable_', state.destroyed, state.length, state.ended);\n\n  if (!state.destroyed && (state.length || state.ended)) {\n    stream.emit('readable');\n    state.emittedReadable = false;\n  } // The stream needs another readable event if\n  // 1. It is not flowing, as the flow mechanism will take\n  //    care of it.\n  // 2. It is not ended.\n  // 3. It is below the highWaterMark, so we can schedule\n  //    another readable later.\n\n\n  state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark;\n  flow(stream);\n} // at this point, the user has presumably seen the 'readable' event,\n// and called read() to consume some data.  that may have triggered\n// in turn another _read(n) call, in which case reading = true if\n// it's in progress.\n// However, if we're not ended, or reading, and the length < hwm,\n// then go ahead and try to read some more preemptively.\n\n\nfunction maybeReadMore(stream, state) {\n  if (!state.readingMore) {\n    state.readingMore = true;\n    process.nextTick(maybeReadMore_, stream, state);\n  }\n}\n\nfunction maybeReadMore_(stream, state) {\n  // Attempt to read more data if we should.\n  //\n  // The conditions for reading more data are (one of):\n  // - Not enough data buffered (state.length < state.highWaterMark). The loop\n  //   is responsible for filling the buffer with enough data if such data\n  //   is available. If highWaterMark is 0 and we are not in the flowing mode\n  //   we should _not_ attempt to buffer any extra data. We'll get more data\n  //   when the stream consumer calls read() instead.\n  // - No data in the buffer, and the stream is in flowing mode. In this mode\n  //   the loop below is responsible for ensuring read() is called. Failing to\n  //   call read here would abort the flow and there's no other mechanism for\n  //   continuing the flow if the stream consumer has just subscribed to the\n  //   'data' event.\n  //\n  // In addition to the above conditions to keep reading data, the following\n  // conditions prevent the data from being read:\n  // - The stream has ended (state.ended).\n  // - There is already a pending 'read' operation (state.reading). This is a\n  //   case where the the stream has called the implementation defined _read()\n  //   method, but they are processing the call asynchronously and have _not_\n  //   called push() with new data. In this case we skip performing more\n  //   read()s. The execution ends in this method again after the _read() ends\n  //   up calling push() with more data.\n  while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) {\n    var len = state.length;\n    debug('maybeReadMore read 0');\n    stream.read(0);\n    if (len === state.length) // didn't get any data, stop spinning.\n      break;\n  }\n\n  state.readingMore = false;\n} // abstract method.  to be overridden in specific implementation classes.\n// call cb(er, data) where data is <= n in length.\n// for virtual (non-string, non-buffer) streams, \"length\" is somewhat\n// arbitrary, and perhaps not very meaningful.\n\n\nReadable.prototype._read = function (n) {\n  errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()'));\n};\n\nReadable.prototype.pipe = function (dest, pipeOpts) {\n  var src = this;\n  var state = this._readableState;\n\n  switch (state.pipesCount) {\n    case 0:\n      state.pipes = dest;\n      break;\n\n    case 1:\n      state.pipes = [state.pipes, dest];\n      break;\n\n    default:\n      state.pipes.push(dest);\n      break;\n  }\n\n  state.pipesCount += 1;\n  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);\n  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;\n  var endFn = doEnd ? onend : unpipe;\n  if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn);\n  dest.on('unpipe', onunpipe);\n\n  function onunpipe(readable, unpipeInfo) {\n    debug('onunpipe');\n\n    if (readable === src) {\n      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {\n        unpipeInfo.hasUnpiped = true;\n        cleanup();\n      }\n    }\n  }\n\n  function onend() {\n    debug('onend');\n    dest.end();\n  } // when the dest drains, it reduces the awaitDrain counter\n  // on the source.  This would be more elegant with a .once()\n  // handler in flow(), but adding and removing repeatedly is\n  // too slow.\n\n\n  var ondrain = pipeOnDrain(src);\n  dest.on('drain', ondrain);\n  var cleanedUp = false;\n\n  function cleanup() {\n    debug('cleanup'); // cleanup event handlers once the pipe is broken\n\n    dest.removeListener('close', onclose);\n    dest.removeListener('finish', onfinish);\n    dest.removeListener('drain', ondrain);\n    dest.removeListener('error', onerror);\n    dest.removeListener('unpipe', onunpipe);\n    src.removeListener('end', onend);\n    src.removeListener('end', unpipe);\n    src.removeListener('data', ondata);\n    cleanedUp = true; // if the reader is waiting for a drain event from this\n    // specific writer, then it would cause it to never start\n    // flowing again.\n    // So, if this is awaiting a drain, then we just call it now.\n    // If we don't know, then assume that we are waiting for one.\n\n    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();\n  }\n\n  src.on('data', ondata);\n\n  function ondata(chunk) {\n    debug('ondata');\n    var ret = dest.write(chunk);\n    debug('dest.write', ret);\n\n    if (ret === false) {\n      // If the user unpiped during `dest.write()`, it is possible\n      // to get stuck in a permanently paused state if that write\n      // also returned false.\n      // => Check whether `dest` is still a piping destination.\n      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {\n        debug('false write response, pause', state.awaitDrain);\n        state.awaitDrain++;\n      }\n\n      src.pause();\n    }\n  } // if the dest has an error, then stop piping into it.\n  // however, don't suppress the throwing behavior for this.\n\n\n  function onerror(er) {\n    debug('onerror', er);\n    unpipe();\n    dest.removeListener('error', onerror);\n    if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er);\n  } // Make sure our error handler is attached before userland ones.\n\n\n  prependListener(dest, 'error', onerror); // Both close and finish should trigger unpipe, but only once.\n\n  function onclose() {\n    dest.removeListener('finish', onfinish);\n    unpipe();\n  }\n\n  dest.once('close', onclose);\n\n  function onfinish() {\n    debug('onfinish');\n    dest.removeListener('close', onclose);\n    unpipe();\n  }\n\n  dest.once('finish', onfinish);\n\n  function unpipe() {\n    debug('unpipe');\n    src.unpipe(dest);\n  } // tell the dest that it's being piped to\n\n\n  dest.emit('pipe', src); // start the flow if it hasn't been started already.\n\n  if (!state.flowing) {\n    debug('pipe resume');\n    src.resume();\n  }\n\n  return dest;\n};\n\nfunction pipeOnDrain(src) {\n  return function pipeOnDrainFunctionResult() {\n    var state = src._readableState;\n    debug('pipeOnDrain', state.awaitDrain);\n    if (state.awaitDrain) state.awaitDrain--;\n\n    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {\n      state.flowing = true;\n      flow(src);\n    }\n  };\n}\n\nReadable.prototype.unpipe = function (dest) {\n  var state = this._readableState;\n  var unpipeInfo = {\n    hasUnpiped: false\n  }; // if we're not piping anywhere, then do nothing.\n\n  if (state.pipesCount === 0) return this; // just one destination.  most common case.\n\n  if (state.pipesCount === 1) {\n    // passed in one, but it's not the right one.\n    if (dest && dest !== state.pipes) return this;\n    if (!dest) dest = state.pipes; // got a match.\n\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n    if (dest) dest.emit('unpipe', this, unpipeInfo);\n    return this;\n  } // slow case. multiple pipe destinations.\n\n\n  if (!dest) {\n    // remove all.\n    var dests = state.pipes;\n    var len = state.pipesCount;\n    state.pipes = null;\n    state.pipesCount = 0;\n    state.flowing = false;\n\n    for (var i = 0; i < len; i++) {\n      dests[i].emit('unpipe', this, {\n        hasUnpiped: false\n      });\n    }\n\n    return this;\n  } // try to find the right one.\n\n\n  var index = indexOf(state.pipes, dest);\n  if (index === -1) return this;\n  state.pipes.splice(index, 1);\n  state.pipesCount -= 1;\n  if (state.pipesCount === 1) state.pipes = state.pipes[0];\n  dest.emit('unpipe', this, unpipeInfo);\n  return this;\n}; // set up data events if they are asked for\n// Ensure readable listeners eventually get something\n\n\nReadable.prototype.on = function (ev, fn) {\n  var res = Stream.prototype.on.call(this, ev, fn);\n  var state = this._readableState;\n\n  if (ev === 'data') {\n    // update readableListening so that resume() may be a no-op\n    // a few lines down. This is needed to support once('readable').\n    state.readableListening = this.listenerCount('readable') > 0; // Try start flowing on next tick if stream isn't explicitly paused\n\n    if (state.flowing !== false) this.resume();\n  } else if (ev === 'readable') {\n    if (!state.endEmitted && !state.readableListening) {\n      state.readableListening = state.needReadable = true;\n      state.flowing = false;\n      state.emittedReadable = false;\n      debug('on readable', state.length, state.reading);\n\n      if (state.length) {\n        emitReadable(this);\n      } else if (!state.reading) {\n        process.nextTick(nReadingNextTick, this);\n      }\n    }\n  }\n\n  return res;\n};\n\nReadable.prototype.addListener = Readable.prototype.on;\n\nReadable.prototype.removeListener = function (ev, fn) {\n  var res = Stream.prototype.removeListener.call(this, ev, fn);\n\n  if (ev === 'readable') {\n    // We need to check if there is someone still listening to\n    // readable and reset the state. However this needs to happen\n    // after readable has been emitted but before I/O (nextTick) to\n    // support once('readable', fn) cycles. This means that calling\n    // resume within the same tick will have no\n    // effect.\n    process.nextTick(updateReadableListening, this);\n  }\n\n  return res;\n};\n\nReadable.prototype.removeAllListeners = function (ev) {\n  var res = Stream.prototype.removeAllListeners.apply(this, arguments);\n\n  if (ev === 'readable' || ev === undefined) {\n    // We need to check if there is someone still listening to\n    // readable and reset the state. However this needs to happen\n    // after readable has been emitted but before I/O (nextTick) to\n    // support once('readable', fn) cycles. This means that calling\n    // resume within the same tick will have no\n    // effect.\n    process.nextTick(updateReadableListening, this);\n  }\n\n  return res;\n};\n\nfunction updateReadableListening(self) {\n  var state = self._readableState;\n  state.readableListening = self.listenerCount('readable') > 0;\n\n  if (state.resumeScheduled && !state.paused) {\n    // flowing needs to be set to true now, otherwise\n    // the upcoming resume will not flow.\n    state.flowing = true; // crude way to check if we should resume\n  } else if (self.listenerCount('data') > 0) {\n    self.resume();\n  }\n}\n\nfunction nReadingNextTick(self) {\n  debug('readable nexttick read 0');\n  self.read(0);\n} // pause() and resume() are remnants of the legacy readable stream API\n// If the user uses them, then switch into old mode.\n\n\nReadable.prototype.resume = function () {\n  var state = this._readableState;\n\n  if (!state.flowing) {\n    debug('resume'); // we flow only if there is no one listening\n    // for readable, but we still have to call\n    // resume()\n\n    state.flowing = !state.readableListening;\n    resume(this, state);\n  }\n\n  state.paused = false;\n  return this;\n};\n\nfunction resume(stream, state) {\n  if (!state.resumeScheduled) {\n    state.resumeScheduled = true;\n    process.nextTick(resume_, stream, state);\n  }\n}\n\nfunction resume_(stream, state) {\n  debug('resume', state.reading);\n\n  if (!state.reading) {\n    stream.read(0);\n  }\n\n  state.resumeScheduled = false;\n  stream.emit('resume');\n  flow(stream);\n  if (state.flowing && !state.reading) stream.read(0);\n}\n\nReadable.prototype.pause = function () {\n  debug('call pause flowing=%j', this._readableState.flowing);\n\n  if (this._readableState.flowing !== false) {\n    debug('pause');\n    this._readableState.flowing = false;\n    this.emit('pause');\n  }\n\n  this._readableState.paused = true;\n  return this;\n};\n\nfunction flow(stream) {\n  var state = stream._readableState;\n  debug('flow', state.flowing);\n\n  while (state.flowing && stream.read() !== null) {\n    ;\n  }\n} // wrap an old-style stream as the async data source.\n// This is *not* part of the readable stream interface.\n// It is an ugly unfortunate mess of history.\n\n\nReadable.prototype.wrap = function (stream) {\n  var _this = this;\n\n  var state = this._readableState;\n  var paused = false;\n  stream.on('end', function () {\n    debug('wrapped end');\n\n    if (state.decoder && !state.ended) {\n      var chunk = state.decoder.end();\n      if (chunk && chunk.length) _this.push(chunk);\n    }\n\n    _this.push(null);\n  });\n  stream.on('data', function (chunk) {\n    debug('wrapped data');\n    if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode\n\n    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;\n\n    var ret = _this.push(chunk);\n\n    if (!ret) {\n      paused = true;\n      stream.pause();\n    }\n  }); // proxy all the other methods.\n  // important when wrapping filters and duplexes.\n\n  for (var i in stream) {\n    if (this[i] === undefined && typeof stream[i] === 'function') {\n      this[i] = function methodWrap(method) {\n        return function methodWrapReturnFunction() {\n          return stream[method].apply(stream, arguments);\n        };\n      }(i);\n    }\n  } // proxy certain important events.\n\n\n  for (var n = 0; n < kProxyEvents.length; n++) {\n    stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));\n  } // when we try to consume some more bytes, simply unpause the\n  // underlying stream.\n\n\n  this._read = function (n) {\n    debug('wrapped _read', n);\n\n    if (paused) {\n      paused = false;\n      stream.resume();\n    }\n  };\n\n  return this;\n};\n\nif (typeof Symbol === 'function') {\n  Readable.prototype[Symbol.asyncIterator] = function () {\n    if (createReadableStreamAsyncIterator === undefined) {\n      createReadableStreamAsyncIterator = require('./internal/streams/async_iterator');\n    }\n\n    return createReadableStreamAsyncIterator(this);\n  };\n}\n\nObject.defineProperty(Readable.prototype, 'readableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._readableState.highWaterMark;\n  }\n});\nObject.defineProperty(Readable.prototype, 'readableBuffer', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._readableState && this._readableState.buffer;\n  }\n});\nObject.defineProperty(Readable.prototype, 'readableFlowing', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._readableState.flowing;\n  },\n  set: function set(state) {\n    if (this._readableState) {\n      this._readableState.flowing = state;\n    }\n  }\n}); // exposed for testing purposes only.\n\nReadable._fromList = fromList;\nObject.defineProperty(Readable.prototype, 'readableLength', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._readableState.length;\n  }\n}); // Pluck off n bytes from an array of buffers.\n// Length is the combined lengths of all the buffers in the list.\n// This function is designed to be inlinable, so please take care when making\n// changes to the function body.\n\nfunction fromList(n, state) {\n  // nothing buffered\n  if (state.length === 0) return null;\n  var ret;\n  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {\n    // read it all, truncate the list\n    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length);\n    state.buffer.clear();\n  } else {\n    // read part of list\n    ret = state.buffer.consume(n, state.decoder);\n  }\n  return ret;\n}\n\nfunction endReadable(stream) {\n  var state = stream._readableState;\n  debug('endReadable', state.endEmitted);\n\n  if (!state.endEmitted) {\n    state.ended = true;\n    process.nextTick(endReadableNT, state, stream);\n  }\n}\n\nfunction endReadableNT(state, stream) {\n  debug('endReadableNT', state.endEmitted, state.length); // Check that we didn't get one last unshift.\n\n  if (!state.endEmitted && state.length === 0) {\n    state.endEmitted = true;\n    stream.readable = false;\n    stream.emit('end');\n\n    if (state.autoDestroy) {\n      // In case of duplex streams we need a way to detect\n      // if the writable side is ready for autoDestroy as well\n      var wState = stream._writableState;\n\n      if (!wState || wState.autoDestroy && wState.finished) {\n        stream.destroy();\n      }\n    }\n  }\n}\n\nif (typeof Symbol === 'function') {\n  Readable.from = function (iterable, opts) {\n    if (from === undefined) {\n      from = require('./internal/streams/from');\n    }\n\n    return from(Readable, iterable, opts);\n  };\n}\n\nfunction indexOf(xs, x) {\n  for (var i = 0, l = xs.length; i < l; i++) {\n    if (xs[i] === x) return i;\n  }\n\n  return -1;\n}","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n// a transform stream is a readable/writable stream where you do\n// something with the data.  Sometimes it's called a \"filter\",\n// but that's not a great name for it, since that implies a thing where\n// some bits pass through, and others are simply ignored.  (That would\n// be a valid example of a transform, of course.)\n//\n// While the output is causally related to the input, it's not a\n// necessarily symmetric or synchronous transformation.  For example,\n// a zlib stream might take multiple plain-text writes(), and then\n// emit a single compressed chunk some time in the future.\n//\n// Here's how this works:\n//\n// The Transform stream has all the aspects of the readable and writable\n// stream classes.  When you write(chunk), that calls _write(chunk,cb)\n// internally, and returns false if there's a lot of pending writes\n// buffered up.  When you call read(), that calls _read(n) until\n// there's enough pending readable data buffered up.\n//\n// In a transform stream, the written data is placed in a buffer.  When\n// _read(n) is called, it transforms the queued up data, calling the\n// buffered _write cb's as it consumes chunks.  If consuming a single\n// written chunk would result in multiple output chunks, then the first\n// outputted bit calls the readcb, and subsequent chunks just go into\n// the read buffer, and will cause it to emit 'readable' if necessary.\n//\n// This way, back-pressure is actually determined by the reading side,\n// since _read has to be called to start processing a new chunk.  However,\n// a pathological inflate type of transform can cause excessive buffering\n// here.  For example, imagine a stream where every byte of input is\n// interpreted as an integer from 0-255, and then results in that many\n// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in\n// 1kb of data being output.  In this case, you could write a very small\n// amount of input, and end up with a very large amount of output.  In\n// such a pathological inflating mechanism, there'd be no way to tell\n// the system to stop doing the transform.  A single 4MB write could\n// cause the system to run out of memory.\n//\n// However, even in such a pathological case, only a single written chunk\n// would be consumed, and then the rest would wait (un-transformed) until\n// the results of the previous transformed chunk were consumed.\n'use strict';\n\nmodule.exports = Transform;\n\nvar _require$codes = require('../errors').codes,\n    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,\n    ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,\n    ERR_TRANSFORM_ALREADY_TRANSFORMING = _require$codes.ERR_TRANSFORM_ALREADY_TRANSFORMING,\n    ERR_TRANSFORM_WITH_LENGTH_0 = _require$codes.ERR_TRANSFORM_WITH_LENGTH_0;\n\nvar Duplex = require('./_stream_duplex');\n\nrequire('inherits')(Transform, Duplex);\n\nfunction afterTransform(er, data) {\n  var ts = this._transformState;\n  ts.transforming = false;\n  var cb = ts.writecb;\n\n  if (cb === null) {\n    return this.emit('error', new ERR_MULTIPLE_CALLBACK());\n  }\n\n  ts.writechunk = null;\n  ts.writecb = null;\n  if (data != null) // single equals check for both `null` and `undefined`\n    this.push(data);\n  cb(er);\n  var rs = this._readableState;\n  rs.reading = false;\n\n  if (rs.needReadable || rs.length < rs.highWaterMark) {\n    this._read(rs.highWaterMark);\n  }\n}\n\nfunction Transform(options) {\n  if (!(this instanceof Transform)) return new Transform(options);\n  Duplex.call(this, options);\n  this._transformState = {\n    afterTransform: afterTransform.bind(this),\n    needTransform: false,\n    transforming: false,\n    writecb: null,\n    writechunk: null,\n    writeencoding: null\n  }; // start out asking for a readable event once data is transformed.\n\n  this._readableState.needReadable = true; // we have implemented the _read method, and done the other things\n  // that Readable wants before the first _read call, so unset the\n  // sync guard flag.\n\n  this._readableState.sync = false;\n\n  if (options) {\n    if (typeof options.transform === 'function') this._transform = options.transform;\n    if (typeof options.flush === 'function') this._flush = options.flush;\n  } // When the writable side finishes, then flush out anything remaining.\n\n\n  this.on('prefinish', prefinish);\n}\n\nfunction prefinish() {\n  var _this = this;\n\n  if (typeof this._flush === 'function' && !this._readableState.destroyed) {\n    this._flush(function (er, data) {\n      done(_this, er, data);\n    });\n  } else {\n    done(this, null, null);\n  }\n}\n\nTransform.prototype.push = function (chunk, encoding) {\n  this._transformState.needTransform = false;\n  return Duplex.prototype.push.call(this, chunk, encoding);\n}; // This is the part where you do stuff!\n// override this function in implementation classes.\n// 'chunk' is an input chunk.\n//\n// Call `push(newChunk)` to pass along transformed output\n// to the readable side.  You may call 'push' zero or more times.\n//\n// Call `cb(err)` when you are done with this chunk.  If you pass\n// an error, then that'll put the hurt on the whole operation.  If you\n// never call cb(), then you'll never get another chunk.\n\n\nTransform.prototype._transform = function (chunk, encoding, cb) {\n  cb(new ERR_METHOD_NOT_IMPLEMENTED('_transform()'));\n};\n\nTransform.prototype._write = function (chunk, encoding, cb) {\n  var ts = this._transformState;\n  ts.writecb = cb;\n  ts.writechunk = chunk;\n  ts.writeencoding = encoding;\n\n  if (!ts.transforming) {\n    var rs = this._readableState;\n    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);\n  }\n}; // Doesn't matter what the args are here.\n// _transform does all the work.\n// That we got here means that the readable side wants more data.\n\n\nTransform.prototype._read = function (n) {\n  var ts = this._transformState;\n\n  if (ts.writechunk !== null && !ts.transforming) {\n    ts.transforming = true;\n\n    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);\n  } else {\n    // mark that we need a transform, so that any data that comes in\n    // will get processed, now that we've asked for it.\n    ts.needTransform = true;\n  }\n};\n\nTransform.prototype._destroy = function (err, cb) {\n  Duplex.prototype._destroy.call(this, err, function (err2) {\n    cb(err2);\n  });\n};\n\nfunction done(stream, er, data) {\n  if (er) return stream.emit('error', er);\n  if (data != null) // single equals check for both `null` and `undefined`\n    stream.push(data); // TODO(BridgeAR): Write a test for these two error cases\n  // if there's nothing in the write buffer, then that means\n  // that nothing more will ever be provided\n\n  if (stream._writableState.length) throw new ERR_TRANSFORM_WITH_LENGTH_0();\n  if (stream._transformState.transforming) throw new ERR_TRANSFORM_ALREADY_TRANSFORMING();\n  return stream.push(null);\n}","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n// A bit simpler than readable streams.\n// Implement an async ._write(chunk, encoding, cb), and it'll handle all\n// the drain event emission and buffering.\n'use strict';\n\nmodule.exports = Writable;\n/* <replacement> */\n\nfunction WriteReq(chunk, encoding, cb) {\n  this.chunk = chunk;\n  this.encoding = encoding;\n  this.callback = cb;\n  this.next = null;\n} // It seems a linked list but it is not\n// there will be only 2 of these for each stream\n\n\nfunction CorkedRequest(state) {\n  var _this = this;\n\n  this.next = null;\n  this.entry = null;\n\n  this.finish = function () {\n    onCorkedFinish(_this, state);\n  };\n}\n/* </replacement> */\n\n/*<replacement>*/\n\n\nvar Duplex;\n/*</replacement>*/\n\nWritable.WritableState = WritableState;\n/*<replacement>*/\n\nvar internalUtil = {\n  deprecate: require('util-deprecate')\n};\n/*</replacement>*/\n\n/*<replacement>*/\n\nvar Stream = require('./internal/streams/stream');\n/*</replacement>*/\n\n\nvar Buffer = require('buffer').Buffer;\n\nvar OurUint8Array = global.Uint8Array || function () {};\n\nfunction _uint8ArrayToBuffer(chunk) {\n  return Buffer.from(chunk);\n}\n\nfunction _isUint8Array(obj) {\n  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;\n}\n\nvar destroyImpl = require('./internal/streams/destroy');\n\nvar _require = require('./internal/streams/state'),\n    getHighWaterMark = _require.getHighWaterMark;\n\nvar _require$codes = require('../errors').codes,\n    ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE,\n    ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED,\n    ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK,\n    ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE,\n    ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED,\n    ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES,\n    ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END,\n    ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING;\n\nvar errorOrDestroy = destroyImpl.errorOrDestroy;\n\nrequire('inherits')(Writable, Stream);\n\nfunction nop() {}\n\nfunction WritableState(options, stream, isDuplex) {\n  Duplex = Duplex || require('./_stream_duplex');\n  options = options || {}; // Duplex streams are both readable and writable, but share\n  // the same options object.\n  // However, some cases require setting options to different\n  // values for the readable and the writable sides of the duplex stream,\n  // e.g. options.readableObjectMode vs. options.writableObjectMode, etc.\n\n  if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag to indicate whether or not this stream\n  // contains buffers or objects.\n\n  this.objectMode = !!options.objectMode;\n  if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode; // the point at which write() starts returning false\n  // Note: 0 is a valid value, means that we always return false if\n  // the entire buffer is not flushed immediately on write()\n\n  this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex); // if _final has been called\n\n  this.finalCalled = false; // drain event flag.\n\n  this.needDrain = false; // at the start of calling end()\n\n  this.ending = false; // when end() has been called, and returned\n\n  this.ended = false; // when 'finish' is emitted\n\n  this.finished = false; // has it been destroyed\n\n  this.destroyed = false; // should we decode strings into buffers before passing to _write?\n  // this is here so that some node-core streams can optimize string\n  // handling at a lower level.\n\n  var noDecode = options.decodeStrings === false;\n  this.decodeStrings = !noDecode; // Crypto is kind of old and crusty.  Historically, its default string\n  // encoding is 'binary' so we have to make this configurable.\n  // Everything else in the universe uses 'utf8', though.\n\n  this.defaultEncoding = options.defaultEncoding || 'utf8'; // not an actual buffer we keep track of, but a measurement\n  // of how much we're waiting to get pushed to some underlying\n  // socket or file.\n\n  this.length = 0; // a flag to see when we're in the middle of a write.\n\n  this.writing = false; // when true all writes will be buffered until .uncork() call\n\n  this.corked = 0; // a flag to be able to tell if the onwrite cb is called immediately,\n  // or on a later tick.  We set this to true at first, because any\n  // actions that shouldn't happen until \"later\" should generally also\n  // not happen before the first write call.\n\n  this.sync = true; // a flag to know if we're processing previously buffered items, which\n  // may call the _write() callback in the same tick, so that we don't\n  // end up in an overlapped onwrite situation.\n\n  this.bufferProcessing = false; // the callback that's passed to _write(chunk,cb)\n\n  this.onwrite = function (er) {\n    onwrite(stream, er);\n  }; // the callback that the user supplies to write(chunk,encoding,cb)\n\n\n  this.writecb = null; // the amount that is being written when _write is called.\n\n  this.writelen = 0;\n  this.bufferedRequest = null;\n  this.lastBufferedRequest = null; // number of pending user-supplied write callbacks\n  // this must be 0 before 'finish' can be emitted\n\n  this.pendingcb = 0; // emit prefinish if the only thing we're waiting for is _write cbs\n  // This is relevant for synchronous Transform streams\n\n  this.prefinished = false; // True if the error was already emitted and should not be thrown again\n\n  this.errorEmitted = false; // Should close be emitted on destroy. Defaults to true.\n\n  this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'finish' (and potentially 'end')\n\n  this.autoDestroy = !!options.autoDestroy; // count buffered requests\n\n  this.bufferedRequestCount = 0; // allocate the first CorkedRequest, there is always\n  // one allocated and free to use, and we maintain at most two\n\n  this.corkedRequestsFree = new CorkedRequest(this);\n}\n\nWritableState.prototype.getBuffer = function getBuffer() {\n  var current = this.bufferedRequest;\n  var out = [];\n\n  while (current) {\n    out.push(current);\n    current = current.next;\n  }\n\n  return out;\n};\n\n(function () {\n  try {\n    Object.defineProperty(WritableState.prototype, 'buffer', {\n      get: internalUtil.deprecate(function writableStateBufferGetter() {\n        return this.getBuffer();\n      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')\n    });\n  } catch (_) {}\n})(); // Test _writableState for inheritance to account for Duplex streams,\n// whose prototype chain only points to Readable.\n\n\nvar realHasInstance;\n\nif (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {\n  realHasInstance = Function.prototype[Symbol.hasInstance];\n  Object.defineProperty(Writable, Symbol.hasInstance, {\n    value: function value(object) {\n      if (realHasInstance.call(this, object)) return true;\n      if (this !== Writable) return false;\n      return object && object._writableState instanceof WritableState;\n    }\n  });\n} else {\n  realHasInstance = function realHasInstance(object) {\n    return object instanceof this;\n  };\n}\n\nfunction Writable(options) {\n  Duplex = Duplex || require('./_stream_duplex'); // Writable ctor is applied to Duplexes, too.\n  // `realHasInstance` is necessary because using plain `instanceof`\n  // would return false, as no `_writableState` property is attached.\n  // Trying to use the custom `instanceof` for Writable here will also break the\n  // Node.js LazyTransform implementation, which has a non-trivial getter for\n  // `_writableState` that would lead to infinite recursion.\n  // Checking for a Stream.Duplex instance is faster here instead of inside\n  // the WritableState constructor, at least with V8 6.5\n\n  var isDuplex = this instanceof Duplex;\n  if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options);\n  this._writableState = new WritableState(options, this, isDuplex); // legacy.\n\n  this.writable = true;\n\n  if (options) {\n    if (typeof options.write === 'function') this._write = options.write;\n    if (typeof options.writev === 'function') this._writev = options.writev;\n    if (typeof options.destroy === 'function') this._destroy = options.destroy;\n    if (typeof options.final === 'function') this._final = options.final;\n  }\n\n  Stream.call(this);\n} // Otherwise people can pipe Writable streams, which is just wrong.\n\n\nWritable.prototype.pipe = function () {\n  errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE());\n};\n\nfunction writeAfterEnd(stream, cb) {\n  var er = new ERR_STREAM_WRITE_AFTER_END(); // TODO: defer error events consistently everywhere, not just the cb\n\n  errorOrDestroy(stream, er);\n  process.nextTick(cb, er);\n} // Checks that a user-supplied chunk is valid, especially for the particular\n// mode the stream is in. Currently this means that `null` is never accepted\n// and undefined/non-string values are only allowed in object mode.\n\n\nfunction validChunk(stream, state, chunk, cb) {\n  var er;\n\n  if (chunk === null) {\n    er = new ERR_STREAM_NULL_VALUES();\n  } else if (typeof chunk !== 'string' && !state.objectMode) {\n    er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk);\n  }\n\n  if (er) {\n    errorOrDestroy(stream, er);\n    process.nextTick(cb, er);\n    return false;\n  }\n\n  return true;\n}\n\nWritable.prototype.write = function (chunk, encoding, cb) {\n  var state = this._writableState;\n  var ret = false;\n\n  var isBuf = !state.objectMode && _isUint8Array(chunk);\n\n  if (isBuf && !Buffer.isBuffer(chunk)) {\n    chunk = _uint8ArrayToBuffer(chunk);\n  }\n\n  if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;\n  if (typeof cb !== 'function') cb = nop;\n  if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {\n    state.pendingcb++;\n    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);\n  }\n  return ret;\n};\n\nWritable.prototype.cork = function () {\n  this._writableState.corked++;\n};\n\nWritable.prototype.uncork = function () {\n  var state = this._writableState;\n\n  if (state.corked) {\n    state.corked--;\n    if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);\n  }\n};\n\nWritable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {\n  // node::ParseEncoding() requires lower case.\n  if (typeof encoding === 'string') encoding = encoding.toLowerCase();\n  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding);\n  this._writableState.defaultEncoding = encoding;\n  return this;\n};\n\nObject.defineProperty(Writable.prototype, 'writableBuffer', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState && this._writableState.getBuffer();\n  }\n});\n\nfunction decodeChunk(state, chunk, encoding) {\n  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {\n    chunk = Buffer.from(chunk, encoding);\n  }\n\n  return chunk;\n}\n\nObject.defineProperty(Writable.prototype, 'writableHighWaterMark', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState.highWaterMark;\n  }\n}); // if we're already writing something, then just put this\n// in the queue, and wait our turn.  Otherwise, call _write\n// If we return false, then we need a drain event, so set that flag.\n\nfunction writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {\n  if (!isBuf) {\n    var newChunk = decodeChunk(state, chunk, encoding);\n\n    if (chunk !== newChunk) {\n      isBuf = true;\n      encoding = 'buffer';\n      chunk = newChunk;\n    }\n  }\n\n  var len = state.objectMode ? 1 : chunk.length;\n  state.length += len;\n  var ret = state.length < state.highWaterMark; // we must ensure that previous needDrain will not be reset to false.\n\n  if (!ret) state.needDrain = true;\n\n  if (state.writing || state.corked) {\n    var last = state.lastBufferedRequest;\n    state.lastBufferedRequest = {\n      chunk: chunk,\n      encoding: encoding,\n      isBuf: isBuf,\n      callback: cb,\n      next: null\n    };\n\n    if (last) {\n      last.next = state.lastBufferedRequest;\n    } else {\n      state.bufferedRequest = state.lastBufferedRequest;\n    }\n\n    state.bufferedRequestCount += 1;\n  } else {\n    doWrite(stream, state, false, len, chunk, encoding, cb);\n  }\n\n  return ret;\n}\n\nfunction doWrite(stream, state, writev, len, chunk, encoding, cb) {\n  state.writelen = len;\n  state.writecb = cb;\n  state.writing = true;\n  state.sync = true;\n  if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);\n  state.sync = false;\n}\n\nfunction onwriteError(stream, state, sync, er, cb) {\n  --state.pendingcb;\n\n  if (sync) {\n    // defer the callback if we are being called synchronously\n    // to avoid piling up things on the stack\n    process.nextTick(cb, er); // this can emit finish, and it will always happen\n    // after error\n\n    process.nextTick(finishMaybe, stream, state);\n    stream._writableState.errorEmitted = true;\n    errorOrDestroy(stream, er);\n  } else {\n    // the caller expect this to happen before if\n    // it is async\n    cb(er);\n    stream._writableState.errorEmitted = true;\n    errorOrDestroy(stream, er); // this can emit finish, but finish must\n    // always follow error\n\n    finishMaybe(stream, state);\n  }\n}\n\nfunction onwriteStateUpdate(state) {\n  state.writing = false;\n  state.writecb = null;\n  state.length -= state.writelen;\n  state.writelen = 0;\n}\n\nfunction onwrite(stream, er) {\n  var state = stream._writableState;\n  var sync = state.sync;\n  var cb = state.writecb;\n  if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK();\n  onwriteStateUpdate(state);\n  if (er) onwriteError(stream, state, sync, er, cb);else {\n    // Check if we're actually ready to finish, but don't emit yet\n    var finished = needFinish(state) || stream.destroyed;\n\n    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {\n      clearBuffer(stream, state);\n    }\n\n    if (sync) {\n      process.nextTick(afterWrite, stream, state, finished, cb);\n    } else {\n      afterWrite(stream, state, finished, cb);\n    }\n  }\n}\n\nfunction afterWrite(stream, state, finished, cb) {\n  if (!finished) onwriteDrain(stream, state);\n  state.pendingcb--;\n  cb();\n  finishMaybe(stream, state);\n} // Must force callback to be called on nextTick, so that we don't\n// emit 'drain' before the write() consumer gets the 'false' return\n// value, and has a chance to attach a 'drain' listener.\n\n\nfunction onwriteDrain(stream, state) {\n  if (state.length === 0 && state.needDrain) {\n    state.needDrain = false;\n    stream.emit('drain');\n  }\n} // if there's something in the buffer waiting, then process it\n\n\nfunction clearBuffer(stream, state) {\n  state.bufferProcessing = true;\n  var entry = state.bufferedRequest;\n\n  if (stream._writev && entry && entry.next) {\n    // Fast case, write everything using _writev()\n    var l = state.bufferedRequestCount;\n    var buffer = new Array(l);\n    var holder = state.corkedRequestsFree;\n    holder.entry = entry;\n    var count = 0;\n    var allBuffers = true;\n\n    while (entry) {\n      buffer[count] = entry;\n      if (!entry.isBuf) allBuffers = false;\n      entry = entry.next;\n      count += 1;\n    }\n\n    buffer.allBuffers = allBuffers;\n    doWrite(stream, state, true, state.length, buffer, '', holder.finish); // doWrite is almost always async, defer these to save a bit of time\n    // as the hot path ends with doWrite\n\n    state.pendingcb++;\n    state.lastBufferedRequest = null;\n\n    if (holder.next) {\n      state.corkedRequestsFree = holder.next;\n      holder.next = null;\n    } else {\n      state.corkedRequestsFree = new CorkedRequest(state);\n    }\n\n    state.bufferedRequestCount = 0;\n  } else {\n    // Slow case, write chunks one-by-one\n    while (entry) {\n      var chunk = entry.chunk;\n      var encoding = entry.encoding;\n      var cb = entry.callback;\n      var len = state.objectMode ? 1 : chunk.length;\n      doWrite(stream, state, false, len, chunk, encoding, cb);\n      entry = entry.next;\n      state.bufferedRequestCount--; // if we didn't call the onwrite immediately, then\n      // it means that we need to wait until it does.\n      // also, that means that the chunk and cb are currently\n      // being processed, so move the buffer counter past them.\n\n      if (state.writing) {\n        break;\n      }\n    }\n\n    if (entry === null) state.lastBufferedRequest = null;\n  }\n\n  state.bufferedRequest = entry;\n  state.bufferProcessing = false;\n}\n\nWritable.prototype._write = function (chunk, encoding, cb) {\n  cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()'));\n};\n\nWritable.prototype._writev = null;\n\nWritable.prototype.end = function (chunk, encoding, cb) {\n  var state = this._writableState;\n\n  if (typeof chunk === 'function') {\n    cb = chunk;\n    chunk = null;\n    encoding = null;\n  } else if (typeof encoding === 'function') {\n    cb = encoding;\n    encoding = null;\n  }\n\n  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); // .end() fully uncorks\n\n  if (state.corked) {\n    state.corked = 1;\n    this.uncork();\n  } // ignore unnecessary end() calls.\n\n\n  if (!state.ending) endWritable(this, state, cb);\n  return this;\n};\n\nObject.defineProperty(Writable.prototype, 'writableLength', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    return this._writableState.length;\n  }\n});\n\nfunction needFinish(state) {\n  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;\n}\n\nfunction callFinal(stream, state) {\n  stream._final(function (err) {\n    state.pendingcb--;\n\n    if (err) {\n      errorOrDestroy(stream, err);\n    }\n\n    state.prefinished = true;\n    stream.emit('prefinish');\n    finishMaybe(stream, state);\n  });\n}\n\nfunction prefinish(stream, state) {\n  if (!state.prefinished && !state.finalCalled) {\n    if (typeof stream._final === 'function' && !state.destroyed) {\n      state.pendingcb++;\n      state.finalCalled = true;\n      process.nextTick(callFinal, stream, state);\n    } else {\n      state.prefinished = true;\n      stream.emit('prefinish');\n    }\n  }\n}\n\nfunction finishMaybe(stream, state) {\n  var need = needFinish(state);\n\n  if (need) {\n    prefinish(stream, state);\n\n    if (state.pendingcb === 0) {\n      state.finished = true;\n      stream.emit('finish');\n\n      if (state.autoDestroy) {\n        // In case of duplex streams we need a way to detect\n        // if the readable side is ready for autoDestroy as well\n        var rState = stream._readableState;\n\n        if (!rState || rState.autoDestroy && rState.endEmitted) {\n          stream.destroy();\n        }\n      }\n    }\n  }\n\n  return need;\n}\n\nfunction endWritable(stream, state, cb) {\n  state.ending = true;\n  finishMaybe(stream, state);\n\n  if (cb) {\n    if (state.finished) process.nextTick(cb);else stream.once('finish', cb);\n  }\n\n  state.ended = true;\n  stream.writable = false;\n}\n\nfunction onCorkedFinish(corkReq, state, err) {\n  var entry = corkReq.entry;\n  corkReq.entry = null;\n\n  while (entry) {\n    var cb = entry.callback;\n    state.pendingcb--;\n    cb(err);\n    entry = entry.next;\n  } // reuse the free corkReq.\n\n\n  state.corkedRequestsFree.next = corkReq;\n}\n\nObject.defineProperty(Writable.prototype, 'destroyed', {\n  // making it explicit this property is not enumerable\n  // because otherwise some prototype manipulation in\n  // userland will fail\n  enumerable: false,\n  get: function get() {\n    if (this._writableState === undefined) {\n      return false;\n    }\n\n    return this._writableState.destroyed;\n  },\n  set: function set(value) {\n    // we ignore the value if the stream\n    // has not been initialized yet\n    if (!this._writableState) {\n      return;\n    } // backward compatibility, the user is explicitly\n    // managing destroyed\n\n\n    this._writableState.destroyed = value;\n  }\n});\nWritable.prototype.destroy = destroyImpl.destroy;\nWritable.prototype._undestroy = destroyImpl.undestroy;\n\nWritable.prototype._destroy = function (err, cb) {\n  cb(err);\n};","'use strict';\n\nvar _Object$setPrototypeO;\n\nfunction _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; }\n\nvar finished = require('./end-of-stream');\n\nvar kLastResolve = Symbol('lastResolve');\nvar kLastReject = Symbol('lastReject');\nvar kError = Symbol('error');\nvar kEnded = Symbol('ended');\nvar kLastPromise = Symbol('lastPromise');\nvar kHandlePromise = Symbol('handlePromise');\nvar kStream = Symbol('stream');\n\nfunction createIterResult(value, done) {\n  return {\n    value: value,\n    done: done\n  };\n}\n\nfunction readAndResolve(iter) {\n  var resolve = iter[kLastResolve];\n\n  if (resolve !== null) {\n    var data = iter[kStream].read(); // we defer if data is null\n    // we can be expecting either 'end' or\n    // 'error'\n\n    if (data !== null) {\n      iter[kLastPromise] = null;\n      iter[kLastResolve] = null;\n      iter[kLastReject] = null;\n      resolve(createIterResult(data, false));\n    }\n  }\n}\n\nfunction onReadable(iter) {\n  // we wait for the next tick, because it might\n  // emit an error with process.nextTick\n  process.nextTick(readAndResolve, iter);\n}\n\nfunction wrapForNext(lastPromise, iter) {\n  return function (resolve, reject) {\n    lastPromise.then(function () {\n      if (iter[kEnded]) {\n        resolve(createIterResult(undefined, true));\n        return;\n      }\n\n      iter[kHandlePromise](resolve, reject);\n    }, reject);\n  };\n}\n\nvar AsyncIteratorPrototype = Object.getPrototypeOf(function () {});\nvar ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = {\n  get stream() {\n    return this[kStream];\n  },\n\n  next: function next() {\n    var _this = this;\n\n    // if we have detected an error in the meanwhile\n    // reject straight away\n    var error = this[kError];\n\n    if (error !== null) {\n      return Promise.reject(error);\n    }\n\n    if (this[kEnded]) {\n      return Promise.resolve(createIterResult(undefined, true));\n    }\n\n    if (this[kStream].destroyed) {\n      // We need to defer via nextTick because if .destroy(err) is\n      // called, the error will be emitted via nextTick, and\n      // we cannot guarantee that there is no error lingering around\n      // waiting to be emitted.\n      return new Promise(function (resolve, reject) {\n        process.nextTick(function () {\n          if (_this[kError]) {\n            reject(_this[kError]);\n          } else {\n            resolve(createIterResult(undefined, true));\n          }\n        });\n      });\n    } // if we have multiple next() calls\n    // we will wait for the previous Promise to finish\n    // this logic is optimized to support for await loops,\n    // where next() is only called once at a time\n\n\n    var lastPromise = this[kLastPromise];\n    var promise;\n\n    if (lastPromise) {\n      promise = new Promise(wrapForNext(lastPromise, this));\n    } else {\n      // fast path needed to support multiple this.push()\n      // without triggering the next() queue\n      var data = this[kStream].read();\n\n      if (data !== null) {\n        return Promise.resolve(createIterResult(data, false));\n      }\n\n      promise = new Promise(this[kHandlePromise]);\n    }\n\n    this[kLastPromise] = promise;\n    return promise;\n  }\n}, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () {\n  return this;\n}), _defineProperty(_Object$setPrototypeO, \"return\", function _return() {\n  var _this2 = this;\n\n  // destroy(err, cb) is a private API\n  // we can guarantee we have that here, because we control the\n  // Readable class this is attached to\n  return new Promise(function (resolve, reject) {\n    _this2[kStream].destroy(null, function (err) {\n      if (err) {\n        reject(err);\n        return;\n      }\n\n      resolve(createIterResult(undefined, true));\n    });\n  });\n}), _Object$setPrototypeO), AsyncIteratorPrototype);\n\nvar createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) {\n  var _Object$create;\n\n  var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, {\n    value: stream,\n    writable: true\n  }), _defineProperty(_Object$create, kLastResolve, {\n    value: null,\n    writable: true\n  }), _defineProperty(_Object$create, kLastReject, {\n    value: null,\n    writable: true\n  }), _defineProperty(_Object$create, kError, {\n    value: null,\n    writable: true\n  }), _defineProperty(_Object$create, kEnded, {\n    value: stream._readableState.endEmitted,\n    writable: true\n  }), _defineProperty(_Object$create, kHandlePromise, {\n    value: function value(resolve, reject) {\n      var data = iterator[kStream].read();\n\n      if (data) {\n        iterator[kLastPromise] = null;\n        iterator[kLastResolve] = null;\n        iterator[kLastReject] = null;\n        resolve(createIterResult(data, false));\n      } else {\n        iterator[kLastResolve] = resolve;\n        iterator[kLastReject] = reject;\n      }\n    },\n    writable: true\n  }), _Object$create));\n  iterator[kLastPromise] = null;\n  finished(stream, function (err) {\n    if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {\n      var reject = iterator[kLastReject]; // reject if we are waiting for data in the Promise\n      // returned by next() and store the error\n\n      if (reject !== null) {\n        iterator[kLastPromise] = null;\n        iterator[kLastResolve] = null;\n        iterator[kLastReject] = null;\n        reject(err);\n      }\n\n      iterator[kError] = err;\n      return;\n    }\n\n    var resolve = iterator[kLastResolve];\n\n    if (resolve !== null) {\n      iterator[kLastPromise] = null;\n      iterator[kLastResolve] = null;\n      iterator[kLastReject] = null;\n      resolve(createIterResult(undefined, true));\n    }\n\n    iterator[kEnded] = true;\n  });\n  stream.on('readable', onReadable.bind(null, iterator));\n  return iterator;\n};\n\nmodule.exports = createReadableStreamAsyncIterator;","'use strict';\n\nfunction ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }\n\nfunction _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }\n\nfunction _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; }\n\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\n\nfunction _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); } }\n\nfunction _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }\n\nvar _require = require('buffer'),\n    Buffer = _require.Buffer;\n\nvar _require2 = require('util'),\n    inspect = _require2.inspect;\n\nvar custom = inspect && inspect.custom || 'inspect';\n\nfunction copyBuffer(src, target, offset) {\n  Buffer.prototype.copy.call(src, target, offset);\n}\n\nmodule.exports =\n/*#__PURE__*/\nfunction () {\n  function BufferList() {\n    _classCallCheck(this, BufferList);\n\n    this.head = null;\n    this.tail = null;\n    this.length = 0;\n  }\n\n  _createClass(BufferList, [{\n    key: \"push\",\n    value: function push(v) {\n      var entry = {\n        data: v,\n        next: null\n      };\n      if (this.length > 0) this.tail.next = entry;else this.head = entry;\n      this.tail = entry;\n      ++this.length;\n    }\n  }, {\n    key: \"unshift\",\n    value: function unshift(v) {\n      var entry = {\n        data: v,\n        next: this.head\n      };\n      if (this.length === 0) this.tail = entry;\n      this.head = entry;\n      ++this.length;\n    }\n  }, {\n    key: \"shift\",\n    value: function shift() {\n      if (this.length === 0) return;\n      var ret = this.head.data;\n      if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;\n      --this.length;\n      return ret;\n    }\n  }, {\n    key: \"clear\",\n    value: function clear() {\n      this.head = this.tail = null;\n      this.length = 0;\n    }\n  }, {\n    key: \"join\",\n    value: function join(s) {\n      if (this.length === 0) return '';\n      var p = this.head;\n      var ret = '' + p.data;\n\n      while (p = p.next) {\n        ret += s + p.data;\n      }\n\n      return ret;\n    }\n  }, {\n    key: \"concat\",\n    value: function concat(n) {\n      if (this.length === 0) return Buffer.alloc(0);\n      var ret = Buffer.allocUnsafe(n >>> 0);\n      var p = this.head;\n      var i = 0;\n\n      while (p) {\n        copyBuffer(p.data, ret, i);\n        i += p.data.length;\n        p = p.next;\n      }\n\n      return ret;\n    } // Consumes a specified amount of bytes or characters from the buffered data.\n\n  }, {\n    key: \"consume\",\n    value: function consume(n, hasStrings) {\n      var ret;\n\n      if (n < this.head.data.length) {\n        // `slice` is the same for buffers and strings.\n        ret = this.head.data.slice(0, n);\n        this.head.data = this.head.data.slice(n);\n      } else if (n === this.head.data.length) {\n        // First chunk is a perfect match.\n        ret = this.shift();\n      } else {\n        // Result spans more than one buffer.\n        ret = hasStrings ? this._getString(n) : this._getBuffer(n);\n      }\n\n      return ret;\n    }\n  }, {\n    key: \"first\",\n    value: function first() {\n      return this.head.data;\n    } // Consumes a specified amount of characters from the buffered data.\n\n  }, {\n    key: \"_getString\",\n    value: function _getString(n) {\n      var p = this.head;\n      var c = 1;\n      var ret = p.data;\n      n -= ret.length;\n\n      while (p = p.next) {\n        var str = p.data;\n        var nb = n > str.length ? str.length : n;\n        if (nb === str.length) ret += str;else ret += str.slice(0, n);\n        n -= nb;\n\n        if (n === 0) {\n          if (nb === str.length) {\n            ++c;\n            if (p.next) this.head = p.next;else this.head = this.tail = null;\n          } else {\n            this.head = p;\n            p.data = str.slice(nb);\n          }\n\n          break;\n        }\n\n        ++c;\n      }\n\n      this.length -= c;\n      return ret;\n    } // Consumes a specified amount of bytes from the buffered data.\n\n  }, {\n    key: \"_getBuffer\",\n    value: function _getBuffer(n) {\n      var ret = Buffer.allocUnsafe(n);\n      var p = this.head;\n      var c = 1;\n      p.data.copy(ret);\n      n -= p.data.length;\n\n      while (p = p.next) {\n        var buf = p.data;\n        var nb = n > buf.length ? buf.length : n;\n        buf.copy(ret, ret.length - n, 0, nb);\n        n -= nb;\n\n        if (n === 0) {\n          if (nb === buf.length) {\n            ++c;\n            if (p.next) this.head = p.next;else this.head = this.tail = null;\n          } else {\n            this.head = p;\n            p.data = buf.slice(nb);\n          }\n\n          break;\n        }\n\n        ++c;\n      }\n\n      this.length -= c;\n      return ret;\n    } // Make sure the linked list only shows the minimal necessary information.\n\n  }, {\n    key: custom,\n    value: function value(_, options) {\n      return inspect(this, _objectSpread({}, options, {\n        // Only inspect one level.\n        depth: 0,\n        // It should not recurse.\n        customInspect: false\n      }));\n    }\n  }]);\n\n  return BufferList;\n}();","'use strict'; // undocumented cb() API, needed for core, not for public API\n\nfunction destroy(err, cb) {\n  var _this = this;\n\n  var readableDestroyed = this._readableState && this._readableState.destroyed;\n  var writableDestroyed = this._writableState && this._writableState.destroyed;\n\n  if (readableDestroyed || writableDestroyed) {\n    if (cb) {\n      cb(err);\n    } else if (err) {\n      if (!this._writableState) {\n        process.nextTick(emitErrorNT, this, err);\n      } else if (!this._writableState.errorEmitted) {\n        this._writableState.errorEmitted = true;\n        process.nextTick(emitErrorNT, this, err);\n      }\n    }\n\n    return this;\n  } // we set destroyed to true before firing error callbacks in order\n  // to make it re-entrance safe in case destroy() is called within callbacks\n\n\n  if (this._readableState) {\n    this._readableState.destroyed = true;\n  } // if this is a duplex stream mark the writable part as destroyed as well\n\n\n  if (this._writableState) {\n    this._writableState.destroyed = true;\n  }\n\n  this._destroy(err || null, function (err) {\n    if (!cb && err) {\n      if (!_this._writableState) {\n        process.nextTick(emitErrorAndCloseNT, _this, err);\n      } else if (!_this._writableState.errorEmitted) {\n        _this._writableState.errorEmitted = true;\n        process.nextTick(emitErrorAndCloseNT, _this, err);\n      } else {\n        process.nextTick(emitCloseNT, _this);\n      }\n    } else if (cb) {\n      process.nextTick(emitCloseNT, _this);\n      cb(err);\n    } else {\n      process.nextTick(emitCloseNT, _this);\n    }\n  });\n\n  return this;\n}\n\nfunction emitErrorAndCloseNT(self, err) {\n  emitErrorNT(self, err);\n  emitCloseNT(self);\n}\n\nfunction emitCloseNT(self) {\n  if (self._writableState && !self._writableState.emitClose) return;\n  if (self._readableState && !self._readableState.emitClose) return;\n  self.emit('close');\n}\n\nfunction undestroy() {\n  if (this._readableState) {\n    this._readableState.destroyed = false;\n    this._readableState.reading = false;\n    this._readableState.ended = false;\n    this._readableState.endEmitted = false;\n  }\n\n  if (this._writableState) {\n    this._writableState.destroyed = false;\n    this._writableState.ended = false;\n    this._writableState.ending = false;\n    this._writableState.finalCalled = false;\n    this._writableState.prefinished = false;\n    this._writableState.finished = false;\n    this._writableState.errorEmitted = false;\n  }\n}\n\nfunction emitErrorNT(self, err) {\n  self.emit('error', err);\n}\n\nfunction errorOrDestroy(stream, err) {\n  // We have tests that rely on errors being emitted\n  // in the same tick, so changing this is semver major.\n  // For now when you opt-in to autoDestroy we allow\n  // the error to be emitted nextTick. In a future\n  // semver major update we should change the default to this.\n  var rState = stream._readableState;\n  var wState = stream._writableState;\n  if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err);\n}\n\nmodule.exports = {\n  destroy: destroy,\n  undestroy: undestroy,\n  errorOrDestroy: errorOrDestroy\n};","// Ported from https://github.com/mafintosh/end-of-stream with\n// permission from the author, Mathias Buus (@mafintosh).\n'use strict';\n\nvar ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE;\n\nfunction once(callback) {\n  var called = false;\n  return function () {\n    if (called) return;\n    called = true;\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    callback.apply(this, args);\n  };\n}\n\nfunction noop() {}\n\nfunction isRequest(stream) {\n  return stream.setHeader && typeof stream.abort === 'function';\n}\n\nfunction eos(stream, opts, callback) {\n  if (typeof opts === 'function') return eos(stream, null, opts);\n  if (!opts) opts = {};\n  callback = once(callback || noop);\n  var readable = opts.readable || opts.readable !== false && stream.readable;\n  var writable = opts.writable || opts.writable !== false && stream.writable;\n\n  var onlegacyfinish = function onlegacyfinish() {\n    if (!stream.writable) onfinish();\n  };\n\n  var writableEnded = stream._writableState && stream._writableState.finished;\n\n  var onfinish = function onfinish() {\n    writable = false;\n    writableEnded = true;\n    if (!readable) callback.call(stream);\n  };\n\n  var readableEnded = stream._readableState && stream._readableState.endEmitted;\n\n  var onend = function onend() {\n    readable = false;\n    readableEnded = true;\n    if (!writable) callback.call(stream);\n  };\n\n  var onerror = function onerror(err) {\n    callback.call(stream, err);\n  };\n\n  var onclose = function onclose() {\n    var err;\n\n    if (readable && !readableEnded) {\n      if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();\n      return callback.call(stream, err);\n    }\n\n    if (writable && !writableEnded) {\n      if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE();\n      return callback.call(stream, err);\n    }\n  };\n\n  var onrequest = function onrequest() {\n    stream.req.on('finish', onfinish);\n  };\n\n  if (isRequest(stream)) {\n    stream.on('complete', onfinish);\n    stream.on('abort', onclose);\n    if (stream.req) onrequest();else stream.on('request', onrequest);\n  } else if (writable && !stream._writableState) {\n    // legacy streams\n    stream.on('end', onlegacyfinish);\n    stream.on('close', onlegacyfinish);\n  }\n\n  stream.on('end', onend);\n  stream.on('finish', onfinish);\n  if (opts.error !== false) stream.on('error', onerror);\n  stream.on('close', onclose);\n  return function () {\n    stream.removeListener('complete', onfinish);\n    stream.removeListener('abort', onclose);\n    stream.removeListener('request', onrequest);\n    if (stream.req) stream.req.removeListener('finish', onfinish);\n    stream.removeListener('end', onlegacyfinish);\n    stream.removeListener('close', onlegacyfinish);\n    stream.removeListener('finish', onfinish);\n    stream.removeListener('end', onend);\n    stream.removeListener('error', onerror);\n    stream.removeListener('close', onclose);\n  };\n}\n\nmodule.exports = eos;","module.exports = function () {\n  throw new Error('Readable.from is not available in the browser')\n};\n","// Ported from https://github.com/mafintosh/pump with\n// permission from the author, Mathias Buus (@mafintosh).\n'use strict';\n\nvar eos;\n\nfunction once(callback) {\n  var called = false;\n  return function () {\n    if (called) return;\n    called = true;\n    callback.apply(void 0, arguments);\n  };\n}\n\nvar _require$codes = require('../../../errors').codes,\n    ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS,\n    ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED;\n\nfunction noop(err) {\n  // Rethrow the error if it exists to avoid swallowing it\n  if (err) throw err;\n}\n\nfunction isRequest(stream) {\n  return stream.setHeader && typeof stream.abort === 'function';\n}\n\nfunction destroyer(stream, reading, writing, callback) {\n  callback = once(callback);\n  var closed = false;\n  stream.on('close', function () {\n    closed = true;\n  });\n  if (eos === undefined) eos = require('./end-of-stream');\n  eos(stream, {\n    readable: reading,\n    writable: writing\n  }, function (err) {\n    if (err) return callback(err);\n    closed = true;\n    callback();\n  });\n  var destroyed = false;\n  return function (err) {\n    if (closed) return;\n    if (destroyed) return;\n    destroyed = true; // request.destroy just do .end - .abort is what we want\n\n    if (isRequest(stream)) return stream.abort();\n    if (typeof stream.destroy === 'function') return stream.destroy();\n    callback(err || new ERR_STREAM_DESTROYED('pipe'));\n  };\n}\n\nfunction call(fn) {\n  fn();\n}\n\nfunction pipe(from, to) {\n  return from.pipe(to);\n}\n\nfunction popCallback(streams) {\n  if (!streams.length) return noop;\n  if (typeof streams[streams.length - 1] !== 'function') return noop;\n  return streams.pop();\n}\n\nfunction pipeline() {\n  for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) {\n    streams[_key] = arguments[_key];\n  }\n\n  var callback = popCallback(streams);\n  if (Array.isArray(streams[0])) streams = streams[0];\n\n  if (streams.length < 2) {\n    throw new ERR_MISSING_ARGS('streams');\n  }\n\n  var error;\n  var destroys = streams.map(function (stream, i) {\n    var reading = i < streams.length - 1;\n    var writing = i > 0;\n    return destroyer(stream, reading, writing, function (err) {\n      if (!error) error = err;\n      if (err) destroys.forEach(call);\n      if (reading) return;\n      destroys.forEach(call);\n      callback(error);\n    });\n  });\n  return streams.reduce(pipe);\n}\n\nmodule.exports = pipeline;","'use strict';\n\nvar ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE;\n\nfunction highWaterMarkFrom(options, isDuplex, duplexKey) {\n  return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null;\n}\n\nfunction getHighWaterMark(state, options, duplexKey, isDuplex) {\n  var hwm = highWaterMarkFrom(options, isDuplex, duplexKey);\n\n  if (hwm != null) {\n    if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) {\n      var name = isDuplex ? duplexKey : 'highWaterMark';\n      throw new ERR_INVALID_OPT_VALUE(name, hwm);\n    }\n\n    return Math.floor(hwm);\n  } // Default value\n\n\n  return state.objectMode ? 16 : 16 * 1024;\n}\n\nmodule.exports = {\n  getHighWaterMark: getHighWaterMark\n};","module.exports = require('events').EventEmitter;\n","/*! safe-buffer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */\n/* eslint-disable node/no-deprecated-api */\nvar buffer = require('buffer')\nvar Buffer = buffer.Buffer\n\n// alternative to using Object.keys for old browsers\nfunction copyProps (src, dst) {\n  for (var key in src) {\n    dst[key] = src[key]\n  }\n}\nif (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {\n  module.exports = buffer\n} else {\n  // Copy properties from require('buffer')\n  copyProps(buffer, exports)\n  exports.Buffer = SafeBuffer\n}\n\nfunction SafeBuffer (arg, encodingOrOffset, length) {\n  return Buffer(arg, encodingOrOffset, length)\n}\n\nSafeBuffer.prototype = Object.create(Buffer.prototype)\n\n// Copy static methods from Buffer\ncopyProps(Buffer, SafeBuffer)\n\nSafeBuffer.from = function (arg, encodingOrOffset, length) {\n  if (typeof arg === 'number') {\n    throw new TypeError('Argument must not be a number')\n  }\n  return Buffer(arg, encodingOrOffset, length)\n}\n\nSafeBuffer.alloc = function (size, fill, encoding) {\n  if (typeof size !== 'number') {\n    throw new TypeError('Argument must be a number')\n  }\n  var buf = Buffer(size)\n  if (fill !== undefined) {\n    if (typeof encoding === 'string') {\n      buf.fill(fill, encoding)\n    } else {\n      buf.fill(fill)\n    }\n  } else {\n    buf.fill(0)\n  }\n  return buf\n}\n\nSafeBuffer.allocUnsafe = function (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('Argument must be a number')\n  }\n  return Buffer(size)\n}\n\nSafeBuffer.allocUnsafeSlow = function (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('Argument must be a number')\n  }\n  return buffer.SlowBuffer(size)\n}\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\nmodule.exports = Stream;\n\nvar EE = require('events').EventEmitter;\nvar inherits = require('inherits');\n\ninherits(Stream, EE);\nStream.Readable = require('readable-stream/lib/_stream_readable.js');\nStream.Writable = require('readable-stream/lib/_stream_writable.js');\nStream.Duplex = require('readable-stream/lib/_stream_duplex.js');\nStream.Transform = require('readable-stream/lib/_stream_transform.js');\nStream.PassThrough = require('readable-stream/lib/_stream_passthrough.js');\nStream.finished = require('readable-stream/lib/internal/streams/end-of-stream.js')\nStream.pipeline = require('readable-stream/lib/internal/streams/pipeline.js')\n\n// Backwards-compat with node 0.4.x\nStream.Stream = Stream;\n\n\n\n// old-style streams.  Note that the pipe method (the only relevant\n// part of this class) is overridden in the Readable class.\n\nfunction Stream() {\n  EE.call(this);\n}\n\nStream.prototype.pipe = function(dest, options) {\n  var source = this;\n\n  function ondata(chunk) {\n    if (dest.writable) {\n      if (false === dest.write(chunk) && source.pause) {\n        source.pause();\n      }\n    }\n  }\n\n  source.on('data', ondata);\n\n  function ondrain() {\n    if (source.readable && source.resume) {\n      source.resume();\n    }\n  }\n\n  dest.on('drain', ondrain);\n\n  // If the 'end' option is not supplied, dest.end() will be called when\n  // source gets the 'end' or 'close' events.  Only dest.end() once.\n  if (!dest._isStdio && (!options || options.end !== false)) {\n    source.on('end', onend);\n    source.on('close', onclose);\n  }\n\n  var didOnEnd = false;\n  function onend() {\n    if (didOnEnd) return;\n    didOnEnd = true;\n\n    dest.end();\n  }\n\n\n  function onclose() {\n    if (didOnEnd) return;\n    didOnEnd = true;\n\n    if (typeof dest.destroy === 'function') dest.destroy();\n  }\n\n  // don't leave dangling pipes when there are errors.\n  function onerror(er) {\n    cleanup();\n    if (EE.listenerCount(this, 'error') === 0) {\n      throw er; // Unhandled stream error in pipe.\n    }\n  }\n\n  source.on('error', onerror);\n  dest.on('error', onerror);\n\n  // remove all the event listeners that were added.\n  function cleanup() {\n    source.removeListener('data', ondata);\n    dest.removeListener('drain', ondrain);\n\n    source.removeListener('end', onend);\n    source.removeListener('close', onclose);\n\n    source.removeListener('error', onerror);\n    dest.removeListener('error', onerror);\n\n    source.removeListener('end', cleanup);\n    source.removeListener('close', cleanup);\n\n    dest.removeListener('close', cleanup);\n  }\n\n  source.on('end', cleanup);\n  source.on('close', cleanup);\n\n  dest.on('close', cleanup);\n\n  dest.emit('pipe', source);\n\n  // Allow for unix-like usage: A.pipe(B).pipe(C)\n  return dest;\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\n/*<replacement>*/\n\nvar Buffer = require('safe-buffer').Buffer;\n/*</replacement>*/\n\nvar isEncoding = Buffer.isEncoding || function (encoding) {\n  encoding = '' + encoding;\n  switch (encoding && encoding.toLowerCase()) {\n    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':\n      return true;\n    default:\n      return false;\n  }\n};\n\nfunction _normalizeEncoding(enc) {\n  if (!enc) return 'utf8';\n  var retried;\n  while (true) {\n    switch (enc) {\n      case 'utf8':\n      case 'utf-8':\n        return 'utf8';\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return 'utf16le';\n      case 'latin1':\n      case 'binary':\n        return 'latin1';\n      case 'base64':\n      case 'ascii':\n      case 'hex':\n        return enc;\n      default:\n        if (retried) return; // undefined\n        enc = ('' + enc).toLowerCase();\n        retried = true;\n    }\n  }\n};\n\n// Do not cache `Buffer.isEncoding` when checking encoding names as some\n// modules monkey-patch it to support additional encodings\nfunction normalizeEncoding(enc) {\n  var nenc = _normalizeEncoding(enc);\n  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);\n  return nenc || enc;\n}\n\n// StringDecoder provides an interface for efficiently splitting a series of\n// buffers into a series of JS strings without breaking apart multi-byte\n// characters.\nexports.StringDecoder = StringDecoder;\nfunction StringDecoder(encoding) {\n  this.encoding = normalizeEncoding(encoding);\n  var nb;\n  switch (this.encoding) {\n    case 'utf16le':\n      this.text = utf16Text;\n      this.end = utf16End;\n      nb = 4;\n      break;\n    case 'utf8':\n      this.fillLast = utf8FillLast;\n      nb = 4;\n      break;\n    case 'base64':\n      this.text = base64Text;\n      this.end = base64End;\n      nb = 3;\n      break;\n    default:\n      this.write = simpleWrite;\n      this.end = simpleEnd;\n      return;\n  }\n  this.lastNeed = 0;\n  this.lastTotal = 0;\n  this.lastChar = Buffer.allocUnsafe(nb);\n}\n\nStringDecoder.prototype.write = function (buf) {\n  if (buf.length === 0) return '';\n  var r;\n  var i;\n  if (this.lastNeed) {\n    r = this.fillLast(buf);\n    if (r === undefined) return '';\n    i = this.lastNeed;\n    this.lastNeed = 0;\n  } else {\n    i = 0;\n  }\n  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);\n  return r || '';\n};\n\nStringDecoder.prototype.end = utf8End;\n\n// Returns only complete characters in a Buffer\nStringDecoder.prototype.text = utf8Text;\n\n// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer\nStringDecoder.prototype.fillLast = function (buf) {\n  if (this.lastNeed <= buf.length) {\n    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);\n    return this.lastChar.toString(this.encoding, 0, this.lastTotal);\n  }\n  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);\n  this.lastNeed -= buf.length;\n};\n\n// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a\n// continuation byte. If an invalid byte is detected, -2 is returned.\nfunction utf8CheckByte(byte) {\n  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;\n  return byte >> 6 === 0x02 ? -1 : -2;\n}\n\n// Checks at most 3 bytes at the end of a Buffer in order to detect an\n// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)\n// needed to complete the UTF-8 character (if applicable) are returned.\nfunction utf8CheckIncomplete(self, buf, i) {\n  var j = buf.length - 1;\n  if (j < i) return 0;\n  var nb = utf8CheckByte(buf[j]);\n  if (nb >= 0) {\n    if (nb > 0) self.lastNeed = nb - 1;\n    return nb;\n  }\n  if (--j < i || nb === -2) return 0;\n  nb = utf8CheckByte(buf[j]);\n  if (nb >= 0) {\n    if (nb > 0) self.lastNeed = nb - 2;\n    return nb;\n  }\n  if (--j < i || nb === -2) return 0;\n  nb = utf8CheckByte(buf[j]);\n  if (nb >= 0) {\n    if (nb > 0) {\n      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;\n    }\n    return nb;\n  }\n  return 0;\n}\n\n// Validates as many continuation bytes for a multi-byte UTF-8 character as\n// needed or are available. If we see a non-continuation byte where we expect\n// one, we \"replace\" the validated continuation bytes we've seen so far with\n// a single UTF-8 replacement character ('\\ufffd'), to match v8's UTF-8 decoding\n// behavior. 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