livekit-client/dist/livekit-client.e2ee.worker.mjs.map

JavaScript/TypeScript client SDK for LiveKit

{"version":3,"file":"livekit-client.e2ee.worker.mjs","sources":["../node_modules/.pnpm/loglevel@1.9.2/node_modules/loglevel/lib/loglevel.js","../src/logger.ts","../node_modules/.pnpm/@livekit+mutex@1.1.1/node_modules/@livekit/mutex/dist/index.mjs","../src/utils/AsyncQueue.ts","../src/e2ee/constants.ts","../src/room/errors.ts","../src/e2ee/errors.ts","../src/e2ee/events.ts","../src/e2ee/utils.ts","../src/e2ee/worker/DataCryptor.ts","../node_modules/.pnpm/events@3.3.0/node_modules/events/events.js","../src/e2ee/worker/naluUtils.ts","../src/e2ee/worker/sifPayload.ts","../src/e2ee/worker/FrameCryptor.ts","../src/e2ee/worker/ParticipantKeyHandler.ts","../src/e2ee/worker/e2ee.worker.ts"],"sourcesContent":["/*\n* loglevel - https://github.com/pimterry/loglevel\n*\n* Copyright (c) 2013 Tim Perry\n* Licensed under the MIT license.\n*/\n(function (root, definition) {\n    \"use strict\";\n    if (typeof define === 'function' && define.amd) {\n        define(definition);\n    } else if (typeof module === 'object' && module.exports) {\n        module.exports = definition();\n    } else {\n        root.log = definition();\n    }\n}(this, function () {\n    \"use strict\";\n\n    // Slightly dubious tricks to cut down minimized file size\n    var noop = function() {};\n    var undefinedType = \"undefined\";\n    var isIE = (typeof window !== undefinedType) && (typeof window.navigator !== undefinedType) && (\n        /Trident\\/|MSIE /.test(window.navigator.userAgent)\n    );\n\n    var logMethods = [\n        \"trace\",\n        \"debug\",\n        \"info\",\n        \"warn\",\n        \"error\"\n    ];\n\n    var _loggersByName = {};\n    var defaultLogger = null;\n\n    // Cross-browser bind equivalent that works at least back to IE6\n    function bindMethod(obj, methodName) {\n        var method = obj[methodName];\n        if (typeof method.bind === 'function') {\n            return method.bind(obj);\n        } else {\n            try {\n                return Function.prototype.bind.call(method, obj);\n            } catch (e) {\n                // Missing bind shim or IE8 + Modernizr, fallback to wrapping\n                return function() {\n                    return Function.prototype.apply.apply(method, [obj, arguments]);\n                };\n            }\n        }\n    }\n\n    // Trace() doesn't print the message in IE, so for that case we need to wrap it\n    function traceForIE() {\n        if (console.log) {\n            if (console.log.apply) {\n                console.log.apply(console, arguments);\n            } else {\n                // In old IE, native console methods themselves don't have apply().\n                Function.prototype.apply.apply(console.log, [console, arguments]);\n            }\n        }\n        if (console.trace) console.trace();\n    }\n\n    // Build the best logging method possible for this env\n    // Wherever possible we want to bind, not wrap, to preserve stack traces\n    function realMethod(methodName) {\n        if (methodName === 'debug') {\n            methodName = 'log';\n        }\n\n        if (typeof console === undefinedType) {\n            return false; // No method possible, for now - fixed later by enableLoggingWhenConsoleArrives\n        } else if (methodName === 'trace' && isIE) {\n            return traceForIE;\n        } else if (console[methodName] !== undefined) {\n            return bindMethod(console, methodName);\n        } else if (console.log !== undefined) {\n            return bindMethod(console, 'log');\n        } else {\n            return noop;\n        }\n    }\n\n    // These private functions always need `this` to be set properly\n\n    function replaceLoggingMethods() {\n        /*jshint validthis:true */\n        var level = this.getLevel();\n\n        // Replace the actual methods.\n        for (var i = 0; i < logMethods.length; i++) {\n            var methodName = logMethods[i];\n            this[methodName] = (i < level) ?\n                noop :\n                this.methodFactory(methodName, level, this.name);\n        }\n\n        // Define log.log as an alias for log.debug\n        this.log = this.debug;\n\n        // Return any important warnings.\n        if (typeof console === undefinedType && level < this.levels.SILENT) {\n            return \"No console available for logging\";\n        }\n    }\n\n    // In old IE versions, the console isn't present until you first open it.\n    // We build realMethod() replacements here that regenerate logging methods\n    function enableLoggingWhenConsoleArrives(methodName) {\n        return function () {\n            if (typeof console !== undefinedType) {\n                replaceLoggingMethods.call(this);\n                this[methodName].apply(this, arguments);\n            }\n        };\n    }\n\n    // By default, we use closely bound real methods wherever possible, and\n    // otherwise we wait for a console to appear, and then try again.\n    function defaultMethodFactory(methodName, _level, _loggerName) {\n        /*jshint validthis:true */\n        return realMethod(methodName) ||\n               enableLoggingWhenConsoleArrives.apply(this, arguments);\n    }\n\n    function Logger(name, factory) {\n      // Private instance variables.\n      var self = this;\n      /**\n       * The level inherited from a parent logger (or a global default). We\n       * cache this here rather than delegating to the parent so that it stays\n       * in sync with the actual logging methods that we have installed (the\n       * parent could change levels but we might not have rebuilt the loggers\n       * in this child yet).\n       * @type {number}\n       */\n      var inheritedLevel;\n      /**\n       * The default level for this logger, if any. If set, this overrides\n       * `inheritedLevel`.\n       * @type {number|null}\n       */\n      var defaultLevel;\n      /**\n       * A user-specific level for this logger. If set, this overrides\n       * `defaultLevel`.\n       * @type {number|null}\n       */\n      var userLevel;\n\n      var storageKey = \"loglevel\";\n      if (typeof name === \"string\") {\n        storageKey += \":\" + name;\n      } else if (typeof name === \"symbol\") {\n        storageKey = undefined;\n      }\n\n      function persistLevelIfPossible(levelNum) {\n          var levelName = (logMethods[levelNum] || 'silent').toUpperCase();\n\n          if (typeof window === undefinedType || !storageKey) return;\n\n          // Use localStorage if available\n          try {\n              window.localStorage[storageKey] = levelName;\n              return;\n          } catch (ignore) {}\n\n          // Use session cookie as fallback\n          try {\n              window.document.cookie =\n                encodeURIComponent(storageKey) + \"=\" + levelName + \";\";\n          } catch (ignore) {}\n      }\n\n      function getPersistedLevel() {\n          var storedLevel;\n\n          if (typeof window === undefinedType || !storageKey) return;\n\n          try {\n              storedLevel = window.localStorage[storageKey];\n          } catch (ignore) {}\n\n          // Fallback to cookies if local storage gives us nothing\n          if (typeof storedLevel === undefinedType) {\n              try {\n                  var cookie = window.document.cookie;\n                  var cookieName = encodeURIComponent(storageKey);\n                  var location = cookie.indexOf(cookieName + \"=\");\n                  if (location !== -1) {\n                      storedLevel = /^([^;]+)/.exec(\n                          cookie.slice(location + cookieName.length + 1)\n                      )[1];\n                  }\n              } catch (ignore) {}\n          }\n\n          // If the stored level is not valid, treat it as if nothing was stored.\n          if (self.levels[storedLevel] === undefined) {\n              storedLevel = undefined;\n          }\n\n          return storedLevel;\n      }\n\n      function clearPersistedLevel() {\n          if (typeof window === undefinedType || !storageKey) return;\n\n          // Use localStorage if available\n          try {\n              window.localStorage.removeItem(storageKey);\n          } catch (ignore) {}\n\n          // Use session cookie as fallback\n          try {\n              window.document.cookie =\n                encodeURIComponent(storageKey) + \"=; expires=Thu, 01 Jan 1970 00:00:00 UTC\";\n          } catch (ignore) {}\n      }\n\n      function normalizeLevel(input) {\n          var level = input;\n          if (typeof level === \"string\" && self.levels[level.toUpperCase()] !== undefined) {\n              level = self.levels[level.toUpperCase()];\n          }\n          if (typeof level === \"number\" && level >= 0 && level <= self.levels.SILENT) {\n              return level;\n          } else {\n              throw new TypeError(\"log.setLevel() called with invalid level: \" + input);\n          }\n      }\n\n      /*\n       *\n       * Public logger API - see https://github.com/pimterry/loglevel for details\n       *\n       */\n\n      self.name = name;\n\n      self.levels = { \"TRACE\": 0, \"DEBUG\": 1, \"INFO\": 2, \"WARN\": 3,\n          \"ERROR\": 4, \"SILENT\": 5};\n\n      self.methodFactory = factory || defaultMethodFactory;\n\n      self.getLevel = function () {\n          if (userLevel != null) {\n            return userLevel;\n          } else if (defaultLevel != null) {\n            return defaultLevel;\n          } else {\n            return inheritedLevel;\n          }\n      };\n\n      self.setLevel = function (level, persist) {\n          userLevel = normalizeLevel(level);\n          if (persist !== false) {  // defaults to true\n              persistLevelIfPossible(userLevel);\n          }\n\n          // NOTE: in v2, this should call rebuild(), which updates children.\n          return replaceLoggingMethods.call(self);\n      };\n\n      self.setDefaultLevel = function (level) {\n          defaultLevel = normalizeLevel(level);\n          if (!getPersistedLevel()) {\n              self.setLevel(level, false);\n          }\n      };\n\n      self.resetLevel = function () {\n          userLevel = null;\n          clearPersistedLevel();\n          replaceLoggingMethods.call(self);\n      };\n\n      self.enableAll = function(persist) {\n          self.setLevel(self.levels.TRACE, persist);\n      };\n\n      self.disableAll = function(persist) {\n          self.setLevel(self.levels.SILENT, persist);\n      };\n\n      self.rebuild = function () {\n          if (defaultLogger !== self) {\n              inheritedLevel = normalizeLevel(defaultLogger.getLevel());\n          }\n          replaceLoggingMethods.call(self);\n\n          if (defaultLogger === self) {\n              for (var childName in _loggersByName) {\n                _loggersByName[childName].rebuild();\n              }\n          }\n      };\n\n      // Initialize all the internal levels.\n      inheritedLevel = normalizeLevel(\n          defaultLogger ? defaultLogger.getLevel() : \"WARN\"\n      );\n      var initialLevel = getPersistedLevel();\n      if (initialLevel != null) {\n          userLevel = normalizeLevel(initialLevel);\n      }\n      replaceLoggingMethods.call(self);\n    }\n\n    /*\n     *\n     * Top-level API\n     *\n     */\n\n    defaultLogger = new Logger();\n\n    defaultLogger.getLogger = function getLogger(name) {\n        if ((typeof name !== \"symbol\" && typeof name !== \"string\") || name === \"\") {\n            throw new TypeError(\"You must supply a name when creating a logger.\");\n        }\n\n        var logger = _loggersByName[name];\n        if (!logger) {\n            logger = _loggersByName[name] = new Logger(\n                name,\n                defaultLogger.methodFactory\n            );\n        }\n        return logger;\n    };\n\n    // Grab the current global log variable in case of overwrite\n    var _log = (typeof window !== undefinedType) ? window.log : undefined;\n    defaultLogger.noConflict = function() {\n        if (typeof window !== undefinedType &&\n               window.log === defaultLogger) {\n            window.log = _log;\n        }\n\n        return defaultLogger;\n    };\n\n    defaultLogger.getLoggers = function getLoggers() {\n        return _loggersByName;\n    };\n\n    // ES6 default export, for compatibility\n    defaultLogger['default'] = defaultLogger;\n\n    return defaultLogger;\n}));\n","import * as log from 'loglevel';\n\nexport enum LogLevel {\n  trace = 0,\n  debug = 1,\n  info = 2,\n  warn = 3,\n  error = 4,\n  silent = 5,\n}\n\nexport enum LoggerNames {\n  Default = 'livekit',\n  Room = 'livekit-room',\n  TokenSource = 'livekit-token-source',\n  Participant = 'livekit-participant',\n  Track = 'livekit-track',\n  Publication = 'livekit-track-publication',\n  Engine = 'livekit-engine',\n  Signal = 'livekit-signal',\n  PCManager = 'livekit-pc-manager',\n  PCTransport = 'livekit-pc-transport',\n  E2EE = 'lk-e2ee',\n  DataTracks = 'livekit-data-tracks',\n}\n\ntype LogLevelString = keyof typeof LogLevel;\n\nexport type StructuredLogger = log.Logger & {\n  trace: (msg: string, context?: object) => void;\n  debug: (msg: string, context?: object) => void;\n  info: (msg: string, context?: object) => void;\n  warn: (msg: string, context?: object) => void;\n  error: (msg: string, context?: object) => void;\n  setDefaultLevel: (level: log.LogLevelDesc) => void;\n  setLevel: (level: log.LogLevelDesc) => void;\n  getLevel: () => number;\n};\n\nlet livekitLogger = log.getLogger('livekit');\nconst livekitLoggers = Object.values(LoggerNames).map((name) => log.getLogger(name));\n\nlivekitLogger.setDefaultLevel(LogLevel.info);\n\nexport default livekitLogger as StructuredLogger;\n\n/**\n * @internal\n */\nexport function getLogger(name: string) {\n  const logger = log.getLogger(name);\n  logger.setDefaultLevel(livekitLogger.getLevel());\n  return logger as StructuredLogger;\n}\n\nexport function setLogLevel(level: LogLevel | LogLevelString, loggerName?: LoggerNames) {\n  if (loggerName) {\n    log.getLogger(loggerName).setLevel(level);\n  } else {\n    for (const logger of livekitLoggers) {\n      logger.setLevel(level);\n    }\n  }\n}\n\nexport type LogExtension = (level: LogLevel, msg: string, context?: object) => void;\n\n/**\n * use this to hook into the logging function to allow sending internal livekit logs to third party services\n * if set, the browser logs will lose their stacktrace information (see https://github.com/pimterry/loglevel#writing-plugins)\n */\nexport function setLogExtension(extension: LogExtension, logger?: StructuredLogger) {\n  const loggers = logger ? [logger] : livekitLoggers;\n\n  loggers.forEach((logR) => {\n    const originalFactory = logR.methodFactory;\n\n    logR.methodFactory = (methodName, configLevel, loggerName) => {\n      const rawMethod = originalFactory(methodName, configLevel, loggerName);\n\n      const logLevel = LogLevel[methodName as LogLevelString];\n      const needLog = logLevel >= configLevel && logLevel < LogLevel.silent;\n\n      return (msg, context?: [msg: string, context: object]) => {\n        if (context) rawMethod(msg, context);\n        else rawMethod(msg);\n        if (needLog) {\n          extension(logLevel, msg, context);\n        }\n      };\n    };\n    logR.setLevel(logR.getLevel());\n  });\n}\n\nexport const workerLogger = log.getLogger('lk-e2ee') as StructuredLogger;\n","var e = Object.defineProperty;\nvar h = (i, s, t) => s in i ? e(i, s, { enumerable: !0, configurable: !0, writable: !0, value: t }) : i[s] = t;\nvar o = (i, s, t) => h(i, typeof s != \"symbol\" ? s + \"\" : s, t);\nclass _ {\n  constructor() {\n    o(this, \"_locking\");\n    o(this, \"_locks\");\n    this._locking = Promise.resolve(), this._locks = 0;\n  }\n  isLocked() {\n    return this._locks > 0;\n  }\n  lock() {\n    this._locks += 1;\n    let s;\n    const t = new Promise(\n      (l) => s = () => {\n        this._locks -= 1, l();\n      }\n    ), c = this._locking.then(() => s);\n    return this._locking = this._locking.then(() => t), c;\n  }\n}\nclass n {\n  constructor(s) {\n    o(this, \"_queue\");\n    o(this, \"_limit\");\n    o(this, \"_locks\");\n    this._queue = [], this._limit = s, this._locks = 0;\n  }\n  isLocked() {\n    return this._locks >= this._limit;\n  }\n  async lock() {\n    return this.isLocked() ? new Promise((s) => {\n      this._queue.push(() => {\n        this._locks++, s(this._unlock.bind(this));\n      });\n    }) : (this._locks++, this._unlock.bind(this));\n  }\n  _unlock() {\n    if (this._locks--, this._queue.length && !this.isLocked()) {\n      const s = this._queue.shift();\n      s == null || s();\n    }\n  }\n}\nexport {\n  n as MultiMutex,\n  _ as Mutex\n};\n//# sourceMappingURL=index.mjs.map\n","import { Mutex } from '@livekit/mutex';\n\ntype QueueTask<T> = () => PromiseLike<T>;\n\nenum QueueTaskStatus {\n  'WAITING',\n  'RUNNING',\n  'COMPLETED',\n}\n\ntype QueueTaskInfo = {\n  id: number;\n  enqueuedAt: number;\n  executedAt?: number;\n  status: QueueTaskStatus;\n};\n\nexport class AsyncQueue {\n  private pendingTasks: Map<number, QueueTaskInfo>;\n\n  private taskMutex: Mutex;\n\n  private nextTaskIndex: number;\n\n  constructor() {\n    this.pendingTasks = new Map();\n    this.taskMutex = new Mutex();\n    this.nextTaskIndex = 0;\n  }\n\n  async run<T>(task: QueueTask<T>) {\n    const taskInfo: QueueTaskInfo = {\n      id: this.nextTaskIndex++,\n      enqueuedAt: Date.now(),\n      status: QueueTaskStatus.WAITING,\n    };\n    this.pendingTasks.set(taskInfo.id, taskInfo);\n    const unlock = await this.taskMutex.lock();\n    try {\n      taskInfo.executedAt = Date.now();\n      taskInfo.status = QueueTaskStatus.RUNNING;\n      return await task();\n    } finally {\n      taskInfo.status = QueueTaskStatus.COMPLETED;\n      this.pendingTasks.delete(taskInfo.id);\n      unlock();\n    }\n  }\n\n  async flush() {\n    return this.run(async () => {});\n  }\n\n  snapshot() {\n    return Array.from(this.pendingTasks.values());\n  }\n}\n","import type { KeyProviderOptions } from './types';\n\nexport const ENCRYPTION_ALGORITHM = 'AES-GCM';\n\n// How many consecutive frames can fail decrypting before a particular key gets marked as invalid\nexport const DECRYPTION_FAILURE_TOLERANCE = 10;\n\n// We copy the first bytes of the VP8 payload unencrypted.\n// For keyframes this is 10 bytes, for non-keyframes (delta) 3. See\n//   https://tools.ietf.org/html/rfc6386#section-9.1\n// This allows the bridge to continue detecting keyframes (only one byte needed in the JVB)\n// and is also a bit easier for the VP8 decoder (i.e. it generates funny garbage pictures\n// instead of being unable to decode).\n// This is a bit for show and we might want to reduce to 1 unconditionally in the final version.\n//\n// For audio (where frame.type is not set) we do not encrypt the opus TOC byte:\n//   https://tools.ietf.org/html/rfc6716#section-3.1\nexport const UNENCRYPTED_BYTES = {\n  key: 10,\n  delta: 3,\n  audio: 1, // frame.type is not set on audio, so this is set manually\n  empty: 0,\n} as const;\n\n/* We use a 12 byte bit IV. This is signalled in plain together with the\n packet. See https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/encrypt#parameters */\nexport const IV_LENGTH = 12;\n\n// flag set to indicate that e2ee has been setup for sender/receiver;\nexport const E2EE_FLAG = 'lk_e2ee';\n\nexport const SALT = 'LKFrameEncryptionKey';\n\nexport const KEY_PROVIDER_DEFAULTS: KeyProviderOptions = {\n  sharedKey: false,\n  ratchetSalt: SALT,\n  ratchetWindowSize: 8,\n  failureTolerance: DECRYPTION_FAILURE_TOLERANCE,\n  keyringSize: 16,\n  keySize: 128,\n} as const;\n\nexport const MAX_SIF_COUNT = 100;\nexport const MAX_SIF_DURATION = 2000;\n","import { DisconnectReason, RequestResponse_Reason } from '@livekit/protocol';\n\n/** Base error that all LiveKit specific custom errors inherit from. */\nexport class LivekitError extends Error {\n  code: number;\n\n  // More info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause\n  cause?: unknown;\n\n  constructor(code: number, message?: string, options?: { cause?: unknown }) {\n    super(message || 'an error has occurred');\n    this.name = 'LiveKitError';\n    this.code = code;\n\n    if (typeof options?.cause !== 'undefined') {\n      this.cause = options?.cause;\n    }\n  }\n}\n\n/**\n * LiveKit specific error type representing an error with an associated set of reasons.\n * Use this to represent an error with multiple different but contextually related variants.\n * */\nexport abstract class LivekitReasonedError<Reason> extends LivekitError {\n  abstract reason: Reason;\n\n  abstract reasonName: string;\n}\n\nexport class SimulatedError extends LivekitError {\n  readonly name = 'simulated';\n\n  constructor(message = 'Simulated failure') {\n    super(-1, message);\n  }\n}\n\nexport enum ConnectionErrorReason {\n  NotAllowed,\n  ServerUnreachable,\n  InternalError,\n  Cancelled,\n  LeaveRequest,\n  Timeout,\n  WebSocket,\n  ServiceNotFound,\n}\n\ntype NotAllowed = {\n  reason: ConnectionErrorReason.NotAllowed;\n  status: number;\n  context?: unknown;\n};\n\ntype InternalError = {\n  reason: ConnectionErrorReason.InternalError;\n  status: never;\n  context?: { status?: number; statusText?: string };\n};\n\ntype ConnectionTimeout = {\n  reason: ConnectionErrorReason.Timeout;\n  status: never;\n  context: never;\n};\n\ntype LeaveRequest = {\n  reason: ConnectionErrorReason.LeaveRequest;\n  status: never;\n  context: DisconnectReason;\n};\n\ntype Cancelled = {\n  reason: ConnectionErrorReason.Cancelled;\n  status: never;\n  context: never;\n};\n\ntype ServerUnreachable = {\n  reason: ConnectionErrorReason.ServerUnreachable;\n  status?: number;\n  context?: never;\n};\n\ntype WebSocket = {\n  reason: ConnectionErrorReason.WebSocket;\n  status?: number;\n  context?: string;\n};\n\ntype ServiceNotFound = {\n  reason: ConnectionErrorReason.ServiceNotFound;\n  status: never;\n  context: string;\n};\n\ntype ConnectionErrorVariants =\n  | NotAllowed\n  | ConnectionTimeout\n  | LeaveRequest\n  | InternalError\n  | Cancelled\n  | ServerUnreachable\n  | WebSocket\n  | ServiceNotFound;\n\nexport class ConnectionError<\n  Variant extends ConnectionErrorVariants = ConnectionErrorVariants,\n> extends LivekitReasonedError<Variant['reason']> {\n  status?: Variant['status'];\n\n  context: Variant['context'];\n\n  reason: Variant['reason'];\n\n  reasonName: string;\n\n  readonly name = 'ConnectionError';\n\n  protected constructor(\n    message: string,\n    reason: Variant['reason'],\n    status?: Variant['status'],\n    context?: Variant['context'],\n  ) {\n    super(1, message);\n    this.status = status;\n    this.reason = reason;\n    this.context = context;\n    this.reasonName = ConnectionErrorReason[reason];\n  }\n\n  static notAllowed(message: string, status: number, context?: unknown) {\n    return new ConnectionError<NotAllowed>(\n      message,\n      ConnectionErrorReason.NotAllowed,\n      status,\n      context,\n    );\n  }\n\n  static timeout(message: string) {\n    return new ConnectionError<ConnectionTimeout>(message, ConnectionErrorReason.Timeout);\n  }\n\n  static leaveRequest(message: string, context: DisconnectReason) {\n    return new ConnectionError<LeaveRequest>(\n      message,\n      ConnectionErrorReason.LeaveRequest,\n      undefined,\n      context,\n    );\n  }\n\n  static internal(message: string, context?: { status?: number; statusText?: string }) {\n    return new ConnectionError<InternalError>(\n      message,\n      ConnectionErrorReason.InternalError,\n      undefined,\n      context,\n    );\n  }\n\n  static cancelled(message: string) {\n    return new ConnectionError<Cancelled>(message, ConnectionErrorReason.Cancelled);\n  }\n\n  static serverUnreachable(message: string, status?: number) {\n    return new ConnectionError<ServerUnreachable>(\n      message,\n      ConnectionErrorReason.ServerUnreachable,\n      status,\n    );\n  }\n\n  static websocket(message: string, status?: number, reason?: string) {\n    return new ConnectionError<WebSocket>(message, ConnectionErrorReason.WebSocket, status, reason);\n  }\n\n  static serviceNotFound(message: string, serviceName: 'v0-rtc') {\n    return new ConnectionError<ServiceNotFound>(\n      message,\n      ConnectionErrorReason.ServiceNotFound,\n      undefined,\n      serviceName,\n    );\n  }\n}\n\nexport class DeviceUnsupportedError extends LivekitError {\n  readonly name = 'DeviceUnsupportedError';\n\n  constructor(message?: string) {\n    super(21, message ?? 'device is unsupported');\n  }\n}\n\nexport class TrackInvalidError extends LivekitError {\n  readonly name = 'TrackInvalidError';\n\n  constructor(message?: string) {\n    super(20, message ?? 'track is invalid');\n  }\n}\n\nexport class UnsupportedServer extends LivekitError {\n  readonly name = 'UnsupportedServer';\n\n  constructor(message?: string) {\n    super(10, message ?? 'unsupported server');\n  }\n}\n\nexport class UnexpectedConnectionState extends LivekitError {\n  readonly name = 'UnexpectedConnectionState';\n\n  constructor(message?: string) {\n    super(12, message ?? 'unexpected connection state');\n  }\n}\n\nexport class NegotiationError extends LivekitError {\n  readonly name = 'NegotiationError';\n\n  constructor(message?: string) {\n    super(13, message ?? 'unable to negotiate');\n  }\n}\n\nexport class PublishDataError extends LivekitError {\n  readonly name = 'PublishDataError';\n\n  constructor(message?: string) {\n    super(14, message ?? 'unable to publish data');\n  }\n}\n\nexport class PublishTrackError extends LivekitError {\n  readonly name = 'PublishTrackError';\n\n  status: number;\n\n  constructor(message: string, status: number) {\n    super(15, message);\n    this.status = status;\n  }\n}\n\nexport type RequestErrorReason =\n  | Exclude<RequestResponse_Reason, RequestResponse_Reason.OK>\n  | 'TimeoutError';\n\nexport class SignalRequestError extends LivekitReasonedError<RequestErrorReason> {\n  readonly name = 'SignalRequestError';\n\n  reason: RequestErrorReason;\n\n  reasonName: string;\n\n  constructor(message: string, reason: RequestErrorReason) {\n    super(15, message);\n    this.reason = reason;\n    this.reasonName = typeof reason === 'string' ? reason : RequestResponse_Reason[reason];\n  }\n}\n\n// NOTE: matches with https://github.com/livekit/client-sdk-swift/blob/f37bbd260d61e165084962db822c79f995f1a113/Sources/LiveKit/DataStream/StreamError.swift#L17\nexport enum DataStreamErrorReason {\n  // Unable to open a stream with the same ID more than once.\n  AlreadyOpened = 0,\n\n  // Stream closed abnormally by remote participant.\n  AbnormalEnd = 1,\n\n  // Incoming chunk data could not be decoded.\n  DecodeFailed = 2,\n\n  // Read length exceeded total length specified in stream header.\n  LengthExceeded = 3,\n\n  // Read length less than total length specified in stream header.\n  Incomplete = 4,\n\n  // Unable to register a stream handler more than once.\n  HandlerAlreadyRegistered = 7,\n\n  // Encryption type mismatch.\n  EncryptionTypeMismatch = 8,\n}\n\nexport class DataStreamError extends LivekitReasonedError<DataStreamErrorReason> {\n  readonly name = 'DataStreamError';\n\n  reason: DataStreamErrorReason;\n\n  reasonName: string;\n\n  constructor(message: string, reason: DataStreamErrorReason) {\n    super(16, message);\n    this.reason = reason;\n    this.reasonName = DataStreamErrorReason[reason];\n  }\n}\n\nexport class SignalReconnectError extends LivekitError {\n  readonly name = 'SignalReconnectError';\n\n  constructor(message?: string) {\n    super(18, message);\n  }\n}\n\nexport enum MediaDeviceFailure {\n  // user rejected permissions\n  PermissionDenied = 'PermissionDenied',\n  // device is not available\n  NotFound = 'NotFound',\n  // device is in use. On Windows, only a single tab may get access to a device at a time.\n  DeviceInUse = 'DeviceInUse',\n  Other = 'Other',\n}\n\nexport namespace MediaDeviceFailure {\n  export function getFailure(error: any): MediaDeviceFailure | undefined {\n    if (error && 'name' in error) {\n      if (error.name === 'NotFoundError' || error.name === 'DevicesNotFoundError') {\n        return MediaDeviceFailure.NotFound;\n      }\n      if (error.name === 'NotAllowedError' || error.name === 'PermissionDeniedError') {\n        return MediaDeviceFailure.PermissionDenied;\n      }\n      if (error.name === 'NotReadableError' || error.name === 'TrackStartError') {\n        return MediaDeviceFailure.DeviceInUse;\n      }\n      return MediaDeviceFailure.Other;\n    }\n  }\n}\n","import { LivekitError } from '../room/errors';\n\nexport enum CryptorErrorReason {\n  InvalidKey = 0,\n  MissingKey = 1,\n  InternalError = 2,\n}\n\nexport class CryptorError extends LivekitError {\n  reason: CryptorErrorReason;\n\n  participantIdentity?: string;\n\n  constructor(\n    message?: string,\n    reason: CryptorErrorReason = CryptorErrorReason.InternalError,\n    participantIdentity?: string,\n  ) {\n    super(40, message);\n    this.reason = reason;\n    this.participantIdentity = participantIdentity;\n  }\n}\n","import type Participant from '../room/participant/Participant';\nimport type { CryptorError } from './errors';\nimport type { KeyInfo, RatchetResult } from './types';\n\nexport enum KeyProviderEvent {\n  SetKey = 'setKey',\n  /** Event for requesting to ratchet the key used to encrypt the stream */\n  RatchetRequest = 'ratchetRequest',\n  /** Emitted when a key is ratcheted. Could be after auto-ratcheting on decryption failure or\n   *  following a `RatchetRequest`, will contain the ratcheted key material */\n  KeyRatcheted = 'keyRatcheted',\n}\n\nexport type KeyProviderCallbacks = {\n  [KeyProviderEvent.SetKey]: (keyInfo: KeyInfo, updateCurrentKeyIndex: boolean) => void;\n  [KeyProviderEvent.RatchetRequest]: (participantIdentity?: string, keyIndex?: number) => void;\n  [KeyProviderEvent.KeyRatcheted]: (\n    ratchetedResult: RatchetResult,\n    participantIdentity?: string,\n    keyIndex?: number,\n  ) => void;\n};\n\nexport enum KeyHandlerEvent {\n  /** Emitted when a key has been ratcheted. Is emitted when any key has been ratcheted\n   * i.e. when the FrameCryptor tried to ratchet when decryption is failing  */\n  KeyRatcheted = 'keyRatcheted',\n}\n\nexport type ParticipantKeyHandlerCallbacks = {\n  [KeyHandlerEvent.KeyRatcheted]: (\n    ratchetResult: RatchetResult,\n    participantIdentity: string,\n    keyIndex?: number,\n  ) => void;\n};\n\nexport enum EncryptionEvent {\n  ParticipantEncryptionStatusChanged = 'participantEncryptionStatusChanged',\n  EncryptionError = 'encryptionError',\n}\n\nexport type E2EEManagerCallbacks = {\n  [EncryptionEvent.ParticipantEncryptionStatusChanged]: (\n    enabled: boolean,\n    participant: Participant,\n  ) => void;\n  [EncryptionEvent.EncryptionError]: (error: Error, participantIdentity?: string) => void;\n};\n\nexport type CryptorCallbacks = {\n  [CryptorEvent.Error]: (error: CryptorError) => void;\n};\n\nexport enum CryptorEvent {\n  Error = 'cryptorError',\n}\n","import { type DataPacket, EncryptedPacketPayload } from '@livekit/protocol';\nimport { ENCRYPTION_ALGORITHM } from './constants';\nimport type { KeyProviderOptions } from './types';\n\nexport function isE2EESupported() {\n  return isInsertableStreamSupported() || isScriptTransformSupported();\n}\n\nexport function isScriptTransformSupported() {\n  // @ts-ignore\n  return typeof window.RTCRtpScriptTransform !== 'undefined';\n}\n\nexport function isInsertableStreamSupported() {\n  return (\n    typeof window.RTCRtpSender !== 'undefined' &&\n    // @ts-ignore\n    typeof window.RTCRtpSender.prototype.createEncodedStreams !== 'undefined'\n  );\n}\n\nexport function isVideoFrame(\n  frame: RTCEncodedAudioFrame | RTCEncodedVideoFrame,\n): frame is RTCEncodedVideoFrame {\n  return 'type' in frame;\n}\n\nexport async function importKey(\n  keyBytes: Uint8Array | ArrayBuffer,\n  algorithm: string | { name: string } = { name: ENCRYPTION_ALGORITHM },\n  usage: 'derive' | 'encrypt' = 'encrypt',\n) {\n  // https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/importKey\n  return crypto.subtle.importKey(\n    'raw',\n    keyBytes,\n    algorithm,\n    false,\n    usage === 'derive' ? ['deriveBits', 'deriveKey'] : ['encrypt', 'decrypt'],\n  );\n}\n\nexport async function createKeyMaterialFromString(password: string) {\n  let enc = new TextEncoder();\n\n  const keyMaterial = await crypto.subtle.importKey(\n    'raw',\n    enc.encode(password),\n    {\n      name: 'PBKDF2',\n    },\n    false,\n    ['deriveBits', 'deriveKey'],\n  );\n\n  return keyMaterial;\n}\n\nexport async function createKeyMaterialFromBuffer(cryptoBuffer: ArrayBuffer) {\n  const keyMaterial = await crypto.subtle.importKey('raw', cryptoBuffer, 'HKDF', false, [\n    'deriveBits',\n    'deriveKey',\n  ]);\n\n  return keyMaterial;\n}\n\nfunction getAlgoOptions(algorithmName: string, salt: string) {\n  const textEncoder = new TextEncoder();\n  const encodedSalt = textEncoder.encode(salt);\n  switch (algorithmName) {\n    case 'HKDF':\n      return {\n        name: 'HKDF',\n        salt: encodedSalt,\n        hash: 'SHA-256',\n        info: new ArrayBuffer(128),\n      };\n    case 'PBKDF2': {\n      return {\n        name: 'PBKDF2',\n        salt: encodedSalt,\n        hash: 'SHA-256',\n        iterations: 100000,\n      };\n    }\n    default:\n      throw new Error(`algorithm ${algorithmName} is currently unsupported`);\n  }\n}\n\n/**\n * Derives a set of keys from the master key.\n * See https://tools.ietf.org/html/draft-omara-sframe-00#section-4.3.1\n */\nexport async function deriveKeys(material: CryptoKey, options: KeyProviderOptions) {\n  const algorithmOptions = getAlgoOptions(material.algorithm.name, options.ratchetSalt);\n\n  // https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/deriveKey#HKDF\n  // https://developer.mozilla.org/en-US/docs/Web/API/HkdfParams\n  const encryptionKey = await crypto.subtle.deriveKey(\n    algorithmOptions,\n    material,\n    {\n      name: ENCRYPTION_ALGORITHM,\n      length: options.keySize,\n    },\n    false,\n    ['encrypt', 'decrypt'],\n  );\n\n  return { material, encryptionKey };\n}\n\nexport function createE2EEKey(): Uint8Array {\n  return window.crypto.getRandomValues(new Uint8Array(32));\n}\n\n/**\n * Ratchets a key. See\n * https://tools.ietf.org/html/draft-omara-sframe-00#section-4.3.5.1\n */\nexport async function ratchet(material: CryptoKey, salt: string): Promise<ArrayBuffer> {\n  const algorithmOptions = getAlgoOptions(material.algorithm.name, salt);\n\n  // https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/deriveBits\n  return crypto.subtle.deriveBits(algorithmOptions, material, 256);\n}\n\nexport function needsRbspUnescaping(frameData: Uint8Array) {\n  for (var i = 0; i < frameData.length - 3; i++) {\n    if (frameData[i] == 0 && frameData[i + 1] == 0 && frameData[i + 2] == 3) return true;\n  }\n  return false;\n}\n\nexport function parseRbsp(stream: Uint8Array): Uint8Array {\n  const dataOut: number[] = [];\n  var length = stream.length;\n  for (var i = 0; i < stream.length; ) {\n    // Be careful about over/underflow here. byte_length_ - 3 can underflow, and\n    // i + 3 can overflow, but byte_length_ - i can't, because i < byte_length_\n    // above, and that expression will produce the number of bytes left in\n    // the stream including the byte at i.\n    if (length - i >= 3 && !stream[i] && !stream[i + 1] && stream[i + 2] == 3) {\n      // Two rbsp bytes.\n      dataOut.push(stream[i++]);\n      dataOut.push(stream[i++]);\n      // Skip the emulation byte.\n      i++;\n    } else {\n      // Single rbsp byte.\n      dataOut.push(stream[i++]);\n    }\n  }\n  return new Uint8Array(dataOut);\n}\n\nconst kZerosInStartSequence = 2;\nconst kEmulationByte = 3;\n\nexport function writeRbsp(data_in: Uint8Array): Uint8Array {\n  const dataOut: number[] = [];\n  var numConsecutiveZeros = 0;\n  for (var i = 0; i < data_in.length; ++i) {\n    var byte = data_in[i];\n    if (byte <= kEmulationByte && numConsecutiveZeros >= kZerosInStartSequence) {\n      // Need to escape.\n      dataOut.push(kEmulationByte);\n      numConsecutiveZeros = 0;\n    }\n    dataOut.push(byte);\n    if (byte == 0) {\n      ++numConsecutiveZeros;\n    } else {\n      numConsecutiveZeros = 0;\n    }\n  }\n  return new Uint8Array(dataOut);\n}\n\nexport function asEncryptablePacket(packet: DataPacket): EncryptedPacketPayload | undefined {\n  if (\n    packet.value?.case !== 'sipDtmf' &&\n    packet.value?.case !== 'metrics' &&\n    packet.value?.case !== 'speaker' &&\n    packet.value?.case !== 'transcription' &&\n    packet.value?.case !== 'encryptedPacket'\n  ) {\n    return new EncryptedPacketPayload({\n      value: packet.value,\n    });\n  }\n  return undefined;\n}\n","import { workerLogger } from '../../logger';\nimport { ENCRYPTION_ALGORITHM } from '../constants';\nimport { CryptorError, CryptorErrorReason } from '../errors';\nimport type { DecodeRatchetOptions, KeySet, RatchetResult } from '../types';\nimport { deriveKeys } from '../utils';\nimport type { ParticipantKeyHandler } from './ParticipantKeyHandler';\n\nexport class DataCryptor {\n  private static sendCount = 0;\n\n  private static makeIV(timestamp: number) {\n    const iv = new ArrayBuffer(12);\n    const ivView = new DataView(iv);\n    const randomBytes = crypto.getRandomValues(new Uint32Array(1));\n    ivView.setUint32(0, randomBytes[0]);\n    ivView.setUint32(4, timestamp);\n    ivView.setUint32(8, timestamp - (DataCryptor.sendCount % 0xffff));\n    DataCryptor.sendCount++;\n\n    return iv;\n  }\n\n  static async encrypt(\n    data: Uint8Array,\n    keys: ParticipantKeyHandler,\n  ): Promise<{\n    payload: Uint8Array;\n    iv: Uint8Array;\n    keyIndex: number;\n  }> {\n    const iv = DataCryptor.makeIV(performance.now());\n    const keySet = await keys.getKeySet();\n    if (!keySet) {\n      throw new Error('No key set found');\n    }\n\n    const cipherText = await crypto.subtle.encrypt(\n      {\n        name: ENCRYPTION_ALGORITHM,\n        iv,\n      },\n      keySet.encryptionKey,\n      new Uint8Array(data),\n    );\n\n    return {\n      payload: new Uint8Array(cipherText),\n      iv: new Uint8Array(iv),\n      keyIndex: keys.getCurrentKeyIndex(),\n    };\n  }\n\n  static async decrypt(\n    data: Uint8Array,\n    iv: Uint8Array,\n    keys: ParticipantKeyHandler,\n    keyIndex: number = 0,\n    initialMaterial?: KeySet,\n    ratchetOpts: DecodeRatchetOptions = { ratchetCount: 0 },\n  ): Promise<{\n    payload: Uint8Array;\n  }> {\n    const keySet = await keys.getKeySet(keyIndex);\n    if (!keySet) {\n      throw new Error('No key set found');\n    }\n\n    try {\n      const plainText = await crypto.subtle.decrypt(\n        {\n          name: ENCRYPTION_ALGORITHM,\n          iv,\n        },\n        keySet.encryptionKey,\n        new Uint8Array(data),\n      );\n      return {\n        payload: new Uint8Array(plainText),\n      };\n    } catch (error: any) {\n      if (keys.keyProviderOptions.ratchetWindowSize > 0) {\n        if (ratchetOpts.ratchetCount < keys.keyProviderOptions.ratchetWindowSize) {\n          workerLogger.debug(\n            `DataCryptor: ratcheting key attempt ${ratchetOpts.ratchetCount} of ${\n              keys.keyProviderOptions.ratchetWindowSize\n            }, for data packet`,\n          );\n\n          let ratchetedKeySet: KeySet | undefined;\n          let ratchetResult: RatchetResult | undefined;\n          if ((initialMaterial ?? keySet) === keys.getKeySet(keyIndex)) {\n            // only ratchet if the currently set key is still the same as the one used to decrypt this frame\n            // if not, it might be that a different frame has already ratcheted and we try with that one first\n            ratchetResult = await keys.ratchetKey(keyIndex, false);\n\n            ratchetedKeySet = await deriveKeys(ratchetResult.cryptoKey, keys.keyProviderOptions);\n          }\n\n          const decryptedData = await DataCryptor.decrypt(\n            data,\n            iv,\n            keys,\n            keyIndex,\n            initialMaterial,\n            {\n              ratchetCount: ratchetOpts.ratchetCount + 1,\n              encryptionKey: ratchetedKeySet?.encryptionKey,\n            },\n          );\n\n          if (decryptedData && ratchetedKeySet) {\n            // before updating the keys, make sure that the keySet used for this frame is still the same as the currently set key\n            // if it's not, a new key might have been set already, which we don't want to override\n            if ((initialMaterial ?? keySet) === keys.getKeySet(keyIndex)) {\n              keys.setKeySet(ratchetedKeySet, keyIndex, ratchetResult);\n              // decryption was successful, set the new key index to reflect the ratcheted key set\n              keys.setCurrentKeyIndex(keyIndex);\n            }\n          }\n          return decryptedData;\n        } else {\n          /**\n           * Because we only set a new key once decryption has been successful,\n           * we can be sure that we don't need to reset the key to the initial material at this point\n           * as the key has not been updated on the keyHandler instance\n           */\n\n          workerLogger.warn('DataCryptor: maximum ratchet attempts exceeded');\n          throw new CryptorError(\n            `DataCryptor: valid key missing for participant ${keys.participantIdentity}`,\n            CryptorErrorReason.InvalidKey,\n            keys.participantIdentity,\n          );\n        }\n      } else {\n        throw new CryptorError(\n          `DataCryptor: Decryption failed: ${error.message}`,\n          CryptorErrorReason.InvalidKey,\n          keys.participantIdentity,\n        );\n      }\n    }\n  }\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\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,