next-csrf/example/.next/cache/next-babel-loader/8a5bf0b43be82b72b4a3f74ffe193515.json

CSRF mitigation library for Next.js

{"ast":null,"code":"\"use strict\";\n\nvar _interopRequireDefault = require(\"@babel/runtime/helpers/interopRequireDefault\");\n\nexports.__esModule = true;\nexports[\"default\"] = void 0;\n\nvar _unfetch = _interopRequireDefault(require(\"next/dist/build/polyfills/unfetch\"));\n/* eslint-disable */\n// Improved version of https://github.com/Yaffle/EventSource/\n// Available under MIT License (MIT)\n// Only tries to support IE11 and nothing below\n\n\nvar document = window.document;\nvar Response = window.Response;\nvar TextDecoder = window.TextDecoder;\nvar TextEncoder = window.TextEncoder;\nvar AbortController = window.AbortController;\n\nif (AbortController == undefined) {\n  AbortController = function AbortController() {\n    this.signal = null;\n\n    this.abort = function () {};\n  };\n}\n\nfunction TextDecoderPolyfill() {\n  this.bitsNeeded = 0;\n  this.codePoint = 0;\n}\n\n_c = TextDecoderPolyfill;\n\nTextDecoderPolyfill.prototype.decode = function (octets) {\n  function valid(codePoint, shift, octetsCount) {\n    if (octetsCount === 1) {\n      return codePoint >= 0x0080 >> shift && codePoint << shift <= 0x07ff;\n    }\n\n    if (octetsCount === 2) {\n      return codePoint >= 0x0800 >> shift && codePoint << shift <= 0xd7ff || codePoint >= 0xe000 >> shift && codePoint << shift <= 0xffff;\n    }\n\n    if (octetsCount === 3) {\n      return codePoint >= 0x010000 >> shift && codePoint << shift <= 0x10ffff;\n    }\n\n    throw new Error();\n  }\n\n  function octetsCount(bitsNeeded, codePoint) {\n    if (bitsNeeded === 6 * 1) {\n      return codePoint >> 6 > 15 ? 3 : codePoint > 31 ? 2 : 1;\n    }\n\n    if (bitsNeeded === 6 * 2) {\n      return codePoint > 15 ? 3 : 2;\n    }\n\n    if (bitsNeeded === 6 * 3) {\n      return 3;\n    }\n\n    throw new Error();\n  }\n\n  var REPLACER = 0xfffd;\n  var string = '';\n  var bitsNeeded = this.bitsNeeded;\n  var codePoint = this.codePoint;\n\n  for (var i = 0; i < octets.length; i += 1) {\n    var octet = octets[i];\n\n    if (bitsNeeded !== 0) {\n      if (octet < 128 || octet > 191 || !valid(codePoint << 6 | octet & 63, bitsNeeded - 6, octetsCount(bitsNeeded, codePoint))) {\n        bitsNeeded = 0;\n        codePoint = REPLACER;\n        string += String.fromCharCode(codePoint);\n      }\n    }\n\n    if (bitsNeeded === 0) {\n      if (octet >= 0 && octet <= 127) {\n        bitsNeeded = 0;\n        codePoint = octet;\n      } else if (octet >= 192 && octet <= 223) {\n        bitsNeeded = 6 * 1;\n        codePoint = octet & 31;\n      } else if (octet >= 224 && octet <= 239) {\n        bitsNeeded = 6 * 2;\n        codePoint = octet & 15;\n      } else if (octet >= 240 && octet <= 247) {\n        bitsNeeded = 6 * 3;\n        codePoint = octet & 7;\n      } else {\n        bitsNeeded = 0;\n        codePoint = REPLACER;\n      }\n\n      if (bitsNeeded !== 0 && !valid(codePoint, bitsNeeded, octetsCount(bitsNeeded, codePoint))) {\n        bitsNeeded = 0;\n        codePoint = REPLACER;\n      }\n    } else {\n      bitsNeeded -= 6;\n      codePoint = codePoint << 6 | octet & 63;\n    }\n\n    if (bitsNeeded === 0) {\n      if (codePoint <= 0xffff) {\n        string += String.fromCharCode(codePoint);\n      } else {\n        string += String.fromCharCode(0xd800 + (codePoint - 0xffff - 1 >> 10));\n        string += String.fromCharCode(0xdc00 + (codePoint - 0xffff - 1 & 0x3ff));\n      }\n    }\n  }\n\n  this.bitsNeeded = bitsNeeded;\n  this.codePoint = codePoint;\n  return string;\n}; // Firefox < 38 throws an error with stream option\n\n\nvar supportsStreamOption = function supportsStreamOption() {\n  try {\n    return new TextDecoder().decode(new TextEncoder().encode('test'), {\n      stream: true\n    }) === 'test';\n  } catch (error) {\n    console.log(error);\n  }\n\n  return false;\n}; // IE, Edge\n\n\nif (TextDecoder == undefined || TextEncoder == undefined || !supportsStreamOption()) {\n  TextDecoder = TextDecoderPolyfill;\n}\n\nvar k = function k() {};\n\nfunction XHRWrapper(xhr) {\n  this.withCredentials = false;\n  this.responseType = '';\n  this.readyState = 0;\n  this.status = 0;\n  this.statusText = '';\n  this.responseText = '';\n  this.onprogress = k;\n  this.onreadystatechange = k;\n  this._contentType = '';\n  this._xhr = xhr;\n  this._sendTimeout = 0;\n  this._abort = k;\n}\n\n_c2 = XHRWrapper;\n\nXHRWrapper.prototype.open = function (method, url) {\n  this._abort(true);\n\n  var that = this;\n  var xhr = this._xhr;\n  var state = 1;\n  var timeout = 0;\n\n  this._abort = function (silent) {\n    if (that._sendTimeout !== 0) {\n      clearTimeout(that._sendTimeout);\n      that._sendTimeout = 0;\n    }\n\n    if (state === 1 || state === 2 || state === 3) {\n      state = 4;\n      xhr.onload = k;\n      xhr.onerror = k;\n      xhr.onabort = k;\n      xhr.onprogress = k;\n      xhr.onreadystatechange = k; // IE 8 - 9: XDomainRequest#abort() does not fire any event\n      // Opera < 10: XMLHttpRequest#abort() does not fire any event\n\n      xhr.abort();\n\n      if (timeout !== 0) {\n        clearTimeout(timeout);\n        timeout = 0;\n      }\n\n      if (!silent) {\n        that.readyState = 4;\n        that.onreadystatechange();\n      }\n    }\n\n    state = 0;\n  };\n\n  var onStart = function onStart() {\n    if (state === 1) {\n      // state = 2;\n      var status = 0;\n      var statusText = '';\n      var contentType = undefined;\n\n      if (!('contentType' in xhr)) {\n        try {\n          status = xhr.status;\n          statusText = xhr.statusText;\n          contentType = xhr.getResponseHeader('Content-Type');\n        } catch (error) {\n          // IE < 10 throws exception for `xhr.status` when xhr.readyState === 2 || xhr.readyState === 3\n          // Opera < 11 throws exception for `xhr.status` when xhr.readyState === 2\n          // https://bugs.webkit.org/show_bug.cgi?id=29121\n          status = 0;\n          statusText = '';\n          contentType = undefined; // Firefox < 14, Chrome ?, Safari ?\n          // https://bugs.webkit.org/show_bug.cgi?id=29658\n          // https://bugs.webkit.org/show_bug.cgi?id=77854\n        }\n      } else {\n        status = 200;\n        statusText = 'OK';\n        contentType = xhr.contentType;\n      }\n\n      if (status !== 0) {\n        state = 2;\n        that.readyState = 2;\n        that.status = status;\n        that.statusText = statusText;\n        that._contentType = contentType;\n        that.onreadystatechange();\n      }\n    }\n  };\n\n  var onProgress = function onProgress() {\n    onStart();\n\n    if (state === 2 || state === 3) {\n      state = 3;\n      var responseText = '';\n\n      try {\n        responseText = xhr.responseText;\n      } catch (error) {// IE 8 - 9 with XMLHttpRequest\n      }\n\n      that.readyState = 3;\n      that.responseText = responseText;\n      that.onprogress();\n    }\n  };\n\n  var onFinish = function onFinish() {\n    // Firefox 52 fires \"readystatechange\" (xhr.readyState === 4) without final \"readystatechange\" (xhr.readyState === 3)\n    // IE 8 fires \"onload\" without \"onprogress\"\n    onProgress();\n\n    if (state === 1 || state === 2 || state === 3) {\n      state = 4;\n\n      if (timeout !== 0) {\n        clearTimeout(timeout);\n        timeout = 0;\n      }\n\n      that.readyState = 4;\n      that.onreadystatechange();\n    }\n  };\n\n  var onReadyStateChange = function onReadyStateChange() {\n    if (xhr != undefined) {\n      // Opera 12\n      if (xhr.readyState === 4) {\n        onFinish();\n      } else if (xhr.readyState === 3) {\n        onProgress();\n      } else if (xhr.readyState === 2) {\n        onStart();\n      }\n    }\n  };\n\n  var onTimeout = function onTimeout() {\n    timeout = setTimeout(function () {\n      onTimeout();\n    }, 500);\n\n    if (xhr.readyState === 3) {\n      onProgress();\n    }\n  }; // XDomainRequest#abort removes onprogress, onerror, onload\n\n\n  xhr.onload = onFinish;\n  xhr.onerror = onFinish; // improper fix to match Firefox behavior, but it is better than just ignore abort\n  // see https://bugzilla.mozilla.org/show_bug.cgi?id=768596\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=880200\n  // https://code.google.com/p/chromium/issues/detail?id=153570\n  // IE 8 fires \"onload\" without \"onprogress\n\n  xhr.onabort = onFinish; // https://bugzilla.mozilla.org/show_bug.cgi?id=736723\n\n  if (!('sendAsBinary' in XMLHttpRequest.prototype) && !('mozAnon' in XMLHttpRequest.prototype)) {\n    xhr.onprogress = onProgress;\n  } // IE 8 - 9 (XMLHTTPRequest)\n  // Opera < 12\n  // Firefox < 3.5\n  // Firefox 3.5 - 3.6 - ? < 9.0\n  // onprogress is not fired sometimes or delayed\n  // see also #64\n\n\n  xhr.onreadystatechange = onReadyStateChange;\n\n  if ('contentType' in xhr) {\n    url += (url.indexOf('?') === -1 ? '?' : '&') + 'padding=true';\n  }\n\n  xhr.open(method, url, true);\n\n  if ('readyState' in xhr) {\n    // workaround for Opera 12 issue with \"progress\" events\n    // #91\n    timeout = setTimeout(function () {\n      onTimeout();\n    }, 0);\n  }\n};\n\nXHRWrapper.prototype.abort = function () {\n  this._abort(false);\n};\n\nXHRWrapper.prototype.getResponseHeader = function (name) {\n  return this._contentType;\n};\n\nXHRWrapper.prototype.setRequestHeader = function (name, value) {\n  var xhr = this._xhr;\n\n  if ('setRequestHeader' in xhr) {\n    xhr.setRequestHeader(name, value);\n  }\n};\n\nXHRWrapper.prototype.getAllResponseHeaders = function () {\n  return this._xhr.getAllResponseHeaders != undefined ? this._xhr.getAllResponseHeaders() : '';\n};\n\nXHRWrapper.prototype.send = function () {\n  // loading indicator in Safari < ? (6), Chrome < 14, Firefox\n  if (!('ontimeout' in XMLHttpRequest.prototype) && document != undefined && document.readyState != undefined && document.readyState !== 'complete') {\n    var that = this;\n    that._sendTimeout = setTimeout(function () {\n      that._sendTimeout = 0;\n      that.send();\n    }, 4);\n    return;\n  }\n\n  var xhr = this._xhr; // withCredentials should be set after \"open\" for Safari and Chrome (< 19 ?)\n\n  xhr.withCredentials = this.withCredentials;\n  xhr.responseType = this.responseType;\n\n  try {\n    // xhr.send(); throws \"Not enough arguments\" in Firefox 3.0\n    xhr.send(undefined);\n  } catch (error1) {\n    // Safari 5.1.7, Opera 12\n    throw error1;\n  }\n};\n\nfunction toLowerCase(name) {\n  return name.replace(/[A-Z]/g, function (c) {\n    return String.fromCharCode(c.charCodeAt(0) + 0x20);\n  });\n}\n\nfunction HeadersPolyfill(all) {\n  // Get headers: implemented according to mozilla's example code: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/getAllResponseHeaders#Example\n  var map = Object.create(null);\n  var array = all.split('\\r\\n');\n\n  for (var i = 0; i < array.length; i += 1) {\n    var line = array[i];\n    var parts = line.split(': ');\n    var name = parts.shift();\n    var value = parts.join(': ');\n    map[toLowerCase(name)] = value;\n  }\n\n  this._map = map;\n}\n\n_c3 = HeadersPolyfill;\n\nHeadersPolyfill.prototype.get = function (name) {\n  return this._map[toLowerCase(name)];\n};\n\nfunction XHRTransport() {}\n\n_c4 = XHRTransport;\n\nXHRTransport.prototype.open = function (xhr, onStartCallback, onProgressCallback, onFinishCallback, url, withCredentials, headers) {\n  xhr.open('GET', url);\n  var offset = 0;\n\n  xhr.onprogress = function () {\n    var responseText = xhr.responseText;\n    var chunk = responseText.slice(offset);\n    offset += chunk.length;\n    onProgressCallback(chunk);\n  };\n\n  xhr.onreadystatechange = function () {\n    if (xhr.readyState === 2) {\n      var status = xhr.status;\n      var statusText = xhr.statusText;\n      var contentType = xhr.getResponseHeader('Content-Type');\n      var headers = xhr.getAllResponseHeaders();\n      onStartCallback(status, statusText, contentType, new HeadersPolyfill(headers), function () {\n        xhr.abort();\n      });\n    } else if (xhr.readyState === 4) {\n      onFinishCallback();\n    }\n  };\n\n  xhr.withCredentials = withCredentials;\n  xhr.responseType = 'text';\n\n  for (var name in headers) {\n    if (Object.prototype.hasOwnProperty.call(headers, name)) {\n      xhr.setRequestHeader(name, headers[name]);\n    }\n  }\n\n  xhr.send();\n};\n\nfunction HeadersWrapper(headers) {\n  this._headers = headers;\n}\n\n_c5 = HeadersWrapper;\n\nHeadersWrapper.prototype.get = function (name) {\n  return this._headers.get(name);\n};\n\nfunction FetchTransport() {}\n\n_c6 = FetchTransport;\n\nFetchTransport.prototype.open = function (xhr, onStartCallback, onProgressCallback, onFinishCallback, url, withCredentials, headers) {\n  var controller = new AbortController();\n  var signal = controller.signal; // see #120\n\n  var textDecoder = new TextDecoder();\n  (0, _unfetch[\"default\"])(url, {\n    headers: headers,\n    credentials: withCredentials ? 'include' : 'same-origin',\n    signal: signal,\n    cache: 'no-store'\n  }).then(function (response) {\n    var reader = response.body.getReader();\n    onStartCallback(response.status, response.statusText, response.headers.get('Content-Type'), new HeadersWrapper(response.headers), function () {\n      controller.abort();\n      reader.cancel();\n    });\n    return new Promise(function (resolve, reject) {\n      var readNextChunk = function readNextChunk() {\n        reader.read().then(function (result) {\n          if (result.done) {\n            // Note: bytes in textDecoder are ignored\n            resolve(undefined);\n          } else {\n            var chunk = textDecoder.decode(result.value, {\n              stream: true\n            });\n            onProgressCallback(chunk);\n            readNextChunk();\n          }\n        })['catch'](function (error) {\n          reject(error);\n        });\n      };\n\n      readNextChunk();\n    });\n  }).then(function (result) {\n    onFinishCallback();\n    return result;\n  }, function (error) {\n    onFinishCallback();\n    return Promise.reject(error);\n  });\n};\n\nfunction EventTarget() {\n  this._listeners = Object.create(null);\n}\n\n_c7 = EventTarget;\n\nfunction throwError(e) {\n  setTimeout(function () {\n    throw e;\n  }, 0);\n}\n\nEventTarget.prototype.dispatchEvent = function (event) {\n  event.target = this;\n  var typeListeners = this._listeners[event.type];\n\n  if (typeListeners != undefined) {\n    var length = typeListeners.length;\n\n    for (var i = 0; i < length; i += 1) {\n      var listener = typeListeners[i];\n\n      try {\n        if (typeof listener.handleEvent === 'function') {\n          listener.handleEvent(event);\n        } else {\n          listener.call(this, event);\n        }\n      } catch (e) {\n        throwError(e);\n      }\n    }\n  }\n};\n\nEventTarget.prototype.addEventListener = function (type, listener) {\n  type = String(type);\n  var listeners = this._listeners;\n  var typeListeners = listeners[type];\n\n  if (typeListeners == undefined) {\n    typeListeners = [];\n    listeners[type] = typeListeners;\n  }\n\n  var found = false;\n\n  for (var i = 0; i < typeListeners.length; i += 1) {\n    if (typeListeners[i] === listener) {\n      found = true;\n    }\n  }\n\n  if (!found) {\n    typeListeners.push(listener);\n  }\n};\n\nEventTarget.prototype.removeEventListener = function (type, listener) {\n  type = String(type);\n  var listeners = this._listeners;\n  var typeListeners = listeners[type];\n\n  if (typeListeners != undefined) {\n    var filtered = [];\n\n    for (var i = 0; i < typeListeners.length; i += 1) {\n      if (typeListeners[i] !== listener) {\n        filtered.push(typeListeners[i]);\n      }\n    }\n\n    if (filtered.length === 0) {\n      delete listeners[type];\n    } else {\n      listeners[type] = filtered;\n    }\n  }\n};\n\nfunction Event(type) {\n  this.type = type;\n  this.target = undefined;\n}\n\n_c8 = Event;\n\nfunction MessageEvent(type, options) {\n  Event.call(this, type);\n  this.data = options.data;\n  this.lastEventId = options.lastEventId;\n}\n\n_c9 = MessageEvent;\nMessageEvent.prototype = Object.create(Event.prototype);\n\nfunction ConnectionEvent(type, options) {\n  Event.call(this, type);\n  this.status = options.status;\n  this.statusText = options.statusText;\n  this.headers = options.headers;\n}\n\n_c10 = ConnectionEvent;\nConnectionEvent.prototype = Object.create(Event.prototype);\nvar WAITING = -1;\nvar CONNECTING = 0;\nvar OPEN = 1;\nvar CLOSED = 2;\nvar AFTER_CR = -1;\nvar FIELD_START = 0;\nvar FIELD = 1;\nvar VALUE_START = 2;\nvar VALUE = 3;\nvar contentTypeRegExp = /^text\\/event\\-stream;?(\\s*charset\\=utf\\-8)?$/i;\nvar MINIMUM_DURATION = 1000;\nvar MAXIMUM_DURATION = 18000000;\n\nvar parseDuration = function parseDuration(value, def) {\n  var n = parseInt(value, 10);\n\n  if (n !== n) {\n    n = def;\n  }\n\n  return clampDuration(n);\n};\n\nvar clampDuration = function clampDuration(n) {\n  return Math.min(Math.max(n, MINIMUM_DURATION), MAXIMUM_DURATION);\n};\n\nvar fire = function fire(that, f, event) {\n  try {\n    if (typeof f === 'function') {\n      f.call(that, event);\n    }\n  } catch (e) {\n    throwError(e);\n  }\n};\n\nfunction EventSourcePolyfill(url, options) {\n  EventTarget.call(this);\n  this.onopen = undefined;\n  this.onmessage = undefined;\n  this.onerror = undefined;\n  this.url = undefined;\n  this.readyState = undefined;\n  this.withCredentials = undefined;\n  this._close = undefined;\n  start(this, url, options);\n}\n\n_c11 = EventSourcePolyfill;\nvar isFetchSupported = _unfetch[\"default\"] != undefined && Response != undefined && 'body' in Response.prototype;\n\nfunction start(es, url, options) {\n  url = String(url);\n  var withCredentials = options != undefined && Boolean(options.withCredentials);\n  var initialRetry = clampDuration(1000);\n  var heartbeatTimeout = options != undefined && options.heartbeatTimeout != undefined ? parseDuration(options.heartbeatTimeout, 45000) : clampDuration(45000);\n  var lastEventId = '';\n  var retry = initialRetry;\n  var wasActivity = false;\n  var headers = options != undefined && options.headers != undefined ? JSON.parse(JSON.stringify(options.headers)) : undefined;\n  var CurrentTransport = options != undefined && options.Transport != undefined ? options.Transport : XMLHttpRequest;\n  var xhr = isFetchSupported && !(options != undefined && options.Transport != undefined) ? undefined : new XHRWrapper(new CurrentTransport());\n  var transport = xhr == undefined ? new FetchTransport() : new XHRTransport();\n  var cancelFunction = undefined;\n  var timeout = 0;\n  var currentState = WAITING;\n  var dataBuffer = '';\n  var lastEventIdBuffer = '';\n  var eventTypeBuffer = '';\n  var textBuffer = '';\n  var state = FIELD_START;\n  var fieldStart = 0;\n  var valueStart = 0;\n\n  var onStart = function onStart(status, statusText, contentType, headers, cancel) {\n    if (currentState === CONNECTING) {\n      cancelFunction = cancel;\n\n      if (status === 200 && contentType != undefined && contentTypeRegExp.test(contentType)) {\n        currentState = OPEN;\n        wasActivity = true;\n        retry = initialRetry;\n        es.readyState = OPEN;\n        var event = new ConnectionEvent('open', {\n          status: status,\n          statusText: statusText,\n          headers: headers\n        });\n        es.dispatchEvent(event);\n        fire(es, es.onopen, event);\n      } else {\n        var message = '';\n\n        if (status !== 200) {\n          if (statusText) {\n            statusText = statusText.replace(/\\s+/g, ' ');\n          }\n\n          message = \"EventSource's response has a status \" + status + ' ' + statusText + ' that is not 200. Aborting the connection.';\n        } else {\n          message = \"EventSource's response has a Content-Type specifying an unsupported type: \" + (contentType == undefined ? '-' : contentType.replace(/\\s+/g, ' ')) + '. Aborting the connection.';\n        }\n\n        throwError(new Error(message));\n        close();\n        var event = new ConnectionEvent('error', {\n          status: status,\n          statusText: statusText,\n          headers: headers\n        });\n        es.dispatchEvent(event);\n        fire(es, es.onerror, event);\n      }\n    }\n  };\n\n  var onProgress = function onProgress(textChunk) {\n    if (currentState === OPEN) {\n      var n = -1;\n\n      for (var i = 0; i < textChunk.length; i += 1) {\n        var c = textChunk.charCodeAt(i);\n\n        if (c === '\\n'.charCodeAt(0) || c === '\\r'.charCodeAt(0)) {\n          n = i;\n        }\n      }\n\n      var chunk = (n !== -1 ? textBuffer : '') + textChunk.slice(0, n + 1);\n      textBuffer = (n === -1 ? textBuffer : '') + textChunk.slice(n + 1);\n\n      if (chunk !== '') {\n        wasActivity = true;\n      }\n\n      for (var position = 0; position < chunk.length; position += 1) {\n        var c = chunk.charCodeAt(position);\n\n        if (state === AFTER_CR && c === '\\n'.charCodeAt(0)) {\n          state = FIELD_START;\n        } else {\n          if (state === AFTER_CR) {\n            state = FIELD_START;\n          }\n\n          if (c === '\\r'.charCodeAt(0) || c === '\\n'.charCodeAt(0)) {\n            if (state !== FIELD_START) {\n              if (state === FIELD) {\n                valueStart = position + 1;\n              }\n\n              var field = chunk.slice(fieldStart, valueStart - 1);\n              var value = chunk.slice(valueStart + (valueStart < position && chunk.charCodeAt(valueStart) === ' '.charCodeAt(0) ? 1 : 0), position);\n\n              if (field === 'data') {\n                dataBuffer += '\\n';\n                dataBuffer += value;\n              } else if (field === 'id') {\n                lastEventIdBuffer = value;\n              } else if (field === 'event') {\n                eventTypeBuffer = value;\n              } else if (field === 'retry') {\n                initialRetry = parseDuration(value, initialRetry);\n                retry = initialRetry;\n              } else if (field === 'heartbeatTimeout') {\n                heartbeatTimeout = parseDuration(value, heartbeatTimeout);\n\n                if (timeout !== 0) {\n                  clearTimeout(timeout);\n                  timeout = setTimeout(function () {\n                    onTimeout();\n                  }, heartbeatTimeout);\n                }\n              }\n            }\n\n            if (state === FIELD_START) {\n              if (dataBuffer !== '') {\n                lastEventId = lastEventIdBuffer;\n\n                if (eventTypeBuffer === '') {\n                  eventTypeBuffer = 'message';\n                }\n\n                var event = new MessageEvent(eventTypeBuffer, {\n                  data: dataBuffer.slice(1),\n                  lastEventId: lastEventIdBuffer\n                });\n                es.dispatchEvent(event);\n\n                if (eventTypeBuffer === 'message') {\n                  fire(es, es.onmessage, event);\n                }\n\n                if (currentState === CLOSED) {\n                  return;\n                }\n              }\n\n              dataBuffer = '';\n              eventTypeBuffer = '';\n            }\n\n            state = c === '\\r'.charCodeAt(0) ? AFTER_CR : FIELD_START;\n          } else {\n            if (state === FIELD_START) {\n              fieldStart = position;\n              state = FIELD;\n            }\n\n            if (state === FIELD) {\n              if (c === ':'.charCodeAt(0)) {\n                valueStart = position + 1;\n                state = VALUE_START;\n              }\n            } else if (state === VALUE_START) {\n              state = VALUE;\n            }\n          }\n        }\n      }\n    }\n  };\n\n  var onFinish = function onFinish() {\n    if (currentState === OPEN || currentState === CONNECTING) {\n      currentState = WAITING;\n\n      if (timeout !== 0) {\n        clearTimeout(timeout);\n        timeout = 0;\n      }\n\n      timeout = setTimeout(function () {\n        onTimeout();\n      }, retry);\n      retry = clampDuration(Math.min(initialRetry * 16, retry * 2));\n      es.readyState = CONNECTING;\n      var event = new Event('error');\n      es.dispatchEvent(event);\n      fire(es, es.onerror, event);\n    }\n  };\n\n  var close = function close() {\n    currentState = CLOSED;\n\n    if (cancelFunction != undefined) {\n      cancelFunction();\n      cancelFunction = undefined;\n    }\n\n    if (timeout !== 0) {\n      clearTimeout(timeout);\n      timeout = 0;\n    }\n\n    es.readyState = CLOSED;\n  };\n\n  var onTimeout = function onTimeout() {\n    timeout = 0;\n\n    if (currentState !== WAITING) {\n      if (!wasActivity && cancelFunction != undefined) {\n        throwError(new Error('No activity within ' + heartbeatTimeout + ' milliseconds. Reconnecting.'));\n        cancelFunction();\n        cancelFunction = undefined;\n      } else {\n        wasActivity = false;\n        timeout = setTimeout(function () {\n          onTimeout();\n        }, heartbeatTimeout);\n      }\n\n      return;\n    }\n\n    wasActivity = false;\n    timeout = setTimeout(function () {\n      onTimeout();\n    }, heartbeatTimeout);\n    currentState = CONNECTING;\n    dataBuffer = '';\n    eventTypeBuffer = '';\n    lastEventIdBuffer = lastEventId;\n    textBuffer = '';\n    fieldStart = 0;\n    valueStart = 0;\n    state = FIELD_START; // https://bugzilla.mozilla.org/show_bug.cgi?id=428916\n    // Request header field Last-Event-ID is not allowed by Access-Control-Allow-Headers.\n\n    var requestURL = url;\n\n    if (url.slice(0, 5) !== 'data:' && url.slice(0, 5) !== 'blob:') {\n      if (lastEventId !== '') {\n        requestURL += (url.indexOf('?') === -1 ? 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