musix-oss/node_modules/firebase/firebase-remote-config.js.map

{"version":3,"file":"firebase-remote-config.js","sources":["../../node_modules/tslib/tslib.es6.js","../util/src/errors.ts","../component/src/component.ts","../../node_modules/idb/lib/idb.mjs","../installations/src/util/constants.ts","../installations/src/util/errors.ts","../installations/src/api/common.ts","../installations/src/util/sleep.ts","../installations/src/helpers/buffer-to-base64-url-safe.ts","../installations/src/helpers/generate-fid.ts","../installations/src/util/get-key.ts","../installations/src/helpers/fid-changed.ts","../installations/src/helpers/idb-manager.ts","../installations/src/index.ts","../logger/src/logger.ts","../installations/src/helpers/get-installation-entry.ts","../installations/src/api/create-installation-request.ts","../installations/src/api/generate-auth-token-request.ts","../installations/src/helpers/refresh-auth-token.ts","../installations/src/functions/get-token.ts","../installations/src/api/delete-installation-request.ts","../installations/src/functions/on-id-change.ts","../installations/src/helpers/extract-app-config.ts","../installations/src/functions/get-id.ts","../installations/src/functions/delete-installation.ts","../remote-config/src/client/caching_client.ts","../remote-config/src/errors.ts","../remote-config/src/client/rest_client.ts","../remote-config/src/language.ts","../remote-config/src/client/remote_config_fetch_client.ts","../remote-config/src/value.ts","../remote-config/src/remote_config.ts","../remote-config/src/storage/storage.ts","../remote-config/src/storage/storage_cache.ts","../remote-config/src/client/retrying_client.ts","../remote-config/src/client/exponential_backoff.ts","../remote-config/index.ts"],"sourcesContent":["/*! *****************************************************************************\r\nCopyright (c) Microsoft Corporation. All rights reserved.\r\nLicensed under the Apache License, Version 2.0 (the \"License\"); you may not use\r\nthis file except in compliance with the License. You may obtain a copy of the\r\nLicense at http://www.apache.org/licenses/LICENSE-2.0\r\n\r\nTHIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\r\nKIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED\r\nWARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,\r\nMERCHANTABLITY OR NON-INFRINGEMENT.\r\n\r\nSee the Apache Version 2.0 License for specific language governing permissions\r\nand limitations under the License.\r\n***************************************************************************** */\r\n/* global Reflect, Promise */\r\n\r\nvar extendStatics = function(d, b) {\r\n    extendStatics = Object.setPrototypeOf ||\r\n        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||\r\n        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };\r\n    return extendStatics(d, b);\r\n};\r\n\r\nexport function __extends(d, b) {\r\n    extendStatics(d, b);\r\n    function __() { this.constructor = d; }\r\n    d.prototype = b === null ? 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mod : { default: mod };\r\n}\r\n","/**\n * @license\n * Copyright 2017 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/**\n * @fileoverview Standardized Firebase Error.\n *\n * Usage:\n *\n *   // Typescript string literals for type-safe codes\n *   type Err =\n *     'unknown' |\n *     'object-not-found'\n *     ;\n *\n *   // Closure enum for type-safe error codes\n *   // at-enum {string}\n *   var Err = {\n *     UNKNOWN: 'unknown',\n *     OBJECT_NOT_FOUND: 'object-not-found',\n *   }\n *\n *   let errors: Map<Err, string> = {\n *     'generic-error': \"Unknown error\",\n *     'file-not-found': \"Could not find file: {$file}\",\n *   };\n *\n *   // Type-safe function - must pass a valid error code as param.\n *   let error = new ErrorFactory<Err>('service', 'Service', errors);\n *\n *   ...\n *   throw error.create(Err.GENERIC);\n *   ...\n *   throw error.create(Err.FILE_NOT_FOUND, {'file': fileName});\n *   ...\n *   // Service: Could not file file: foo.txt (service/file-not-found).\n *\n *   catch (e) {\n *     assert(e.message === \"Could not find file: foo.txt.\");\n *     if (e.code === 'service/file-not-found') {\n *       console.log(\"Could not read file: \" + e['file']);\n *     }\n *   }\n */\n\nexport type ErrorMap<ErrorCode extends string> = {\n  readonly [K in ErrorCode]: string;\n};\n\nconst ERROR_NAME = 'FirebaseError';\n\nexport interface StringLike {\n  toString(): string;\n}\n\nexport interface ErrorData {\n  [key: string]: StringLike | undefined;\n}\n\nexport interface FirebaseError extends Error, ErrorData {\n  // Unique code for error - format is service/error-code-string.\n  readonly code: string;\n\n  // Developer-friendly error message.\n  readonly message: string;\n\n  // Always 'FirebaseError'.\n  readonly name: typeof ERROR_NAME;\n\n  // Where available - stack backtrace in a string.\n  readonly stack?: string;\n}\n\n// Based on code from:\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Custom_Error_Types\nexport class FirebaseError extends Error {\n  readonly name = ERROR_NAME;\n\n  constructor(readonly code: string, message: string) {\n    super(message);\n\n    // Fix For ES5\n    // https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work\n    Object.setPrototypeOf(this, FirebaseError.prototype);\n\n    // Maintains proper stack trace for where our error was thrown.\n    // Only available on V8.\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, ErrorFactory.prototype.create);\n    }\n  }\n}\n\nexport class ErrorFactory<\n  ErrorCode extends string,\n  ErrorParams extends { readonly [K in ErrorCode]?: ErrorData } = {}\n> {\n  constructor(\n    private readonly service: string,\n    private readonly serviceName: string,\n    private readonly errors: ErrorMap<ErrorCode>\n  ) {}\n\n  create<K extends ErrorCode>(\n    code: K,\n    ...data: K extends keyof ErrorParams ? [ErrorParams[K]] : []\n  ): FirebaseError {\n    const customData = (data[0] as ErrorData) || {};\n    const fullCode = `${this.service}/${code}`;\n    const template = this.errors[code];\n\n    const message = template ? replaceTemplate(template, customData) : 'Error';\n    // Service Name: Error message (service/code).\n    const fullMessage = `${this.serviceName}: ${message} (${fullCode}).`;\n\n    const error = new FirebaseError(fullCode, fullMessage);\n\n    // Keys with an underscore at the end of their name are not included in\n    // error.data for some reason.\n    // TODO: Replace with Object.entries when lib is updated to es2017.\n    for (const key of Object.keys(customData)) {\n      if (key.slice(-1) !== '_') {\n        if (key in error) {\n          console.warn(\n            `Overwriting FirebaseError base field \"${key}\" can cause unexpected behavior.`\n          );\n        }\n        error[key] = customData[key];\n      }\n    }\n\n    return error;\n  }\n}\n\nfunction replaceTemplate(template: string, data: ErrorData): string {\n  return template.replace(PATTERN, (_, key) => {\n    const value = data[key];\n    return value != null ? value.toString() : `<${key}?>`;\n  });\n}\n\nconst PATTERN = /\\{\\$([^}]+)}/g;\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport {\n  InstantiationMode,\n  InstanceFactory,\n  ComponentType,\n  Dictionary,\n  Name\n} from './types';\n\n/**\n * Component for service name T, e.g. `auth`, `auth-internal`\n */\nexport class Component<T extends Name = Name> {\n  multipleInstances = false;\n  /**\n   * Properties to be added to the service namespace\n   */\n  serviceProps: Dictionary = {};\n\n  instantiationMode = InstantiationMode.LAZY;\n\n  /**\n   *\n   * @param name The public service name, e.g. app, auth, firestore, database\n   * @param instanceFactory Service factory responsible for creating the public interface\n   * @param type whether the service provided by the component is public or private\n   */\n  constructor(\n    readonly name: T,\n    readonly instanceFactory: InstanceFactory<T>,\n    readonly type: ComponentType\n  ) {}\n\n  setInstantiationMode(mode: InstantiationMode): this {\n    this.instantiationMode = mode;\n    return this;\n  }\n\n  setMultipleInstances(multipleInstances: boolean): this {\n    this.multipleInstances = multipleInstances;\n    return this;\n  }\n\n  setServiceProps(props: Dictionary): this {\n    this.serviceProps = props;\n    return this;\n  }\n}\n","function toArray(arr) {\n  return Array.prototype.slice.call(arr);\n}\n\nfunction promisifyRequest(request) {\n  return new Promise(function(resolve, reject) {\n    request.onsuccess = function() {\n      resolve(request.result);\n    };\n\n    request.onerror = function() {\n      reject(request.error);\n    };\n  });\n}\n\nfunction promisifyRequestCall(obj, method, args) {\n  var request;\n  var p = new Promise(function(resolve, reject) {\n    request = obj[method].apply(obj, args);\n    promisifyRequest(request).then(resolve, reject);\n  });\n\n  p.request = request;\n  return p;\n}\n\nfunction promisifyCursorRequestCall(obj, method, args) {\n  var p = promisifyRequestCall(obj, method, args);\n  return p.then(function(value) {\n    if (!value) return;\n    return new Cursor(value, p.request);\n  });\n}\n\nfunction proxyProperties(ProxyClass, targetProp, properties) {\n  properties.forEach(function(prop) {\n    Object.defineProperty(ProxyClass.prototype, prop, {\n      get: function() {\n        return this[targetProp][prop];\n      },\n      set: function(val) {\n        this[targetProp][prop] = val;\n      }\n    });\n  });\n}\n\nfunction proxyRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n  properties.forEach(function(prop) {\n    if (!(prop in Constructor.prototype)) return;\n    ProxyClass.prototype[prop] = function() {\n      return promisifyRequestCall(this[targetProp], prop, arguments);\n    };\n  });\n}\n\nfunction proxyMethods(ProxyClass, targetProp, Constructor, properties) {\n  properties.forEach(function(prop) {\n    if (!(prop in Constructor.prototype)) return;\n    ProxyClass.prototype[prop] = function() {\n      return this[targetProp][prop].apply(this[targetProp], arguments);\n    };\n  });\n}\n\nfunction proxyCursorRequestMethods(ProxyClass, targetProp, Constructor, properties) {\n  properties.forEach(function(prop) {\n    if (!(prop in Constructor.prototype)) return;\n    ProxyClass.prototype[prop] = function() {\n      return promisifyCursorRequestCall(this[targetProp], prop, arguments);\n    };\n  });\n}\n\nfunction Index(index) {\n  this._index = index;\n}\n\nproxyProperties(Index, '_index', [\n  'name',\n  'keyPath',\n  'multiEntry',\n  'unique'\n]);\n\nproxyRequestMethods(Index, '_index', IDBIndex, [\n  'get',\n  'getKey',\n  'getAll',\n  'getAllKeys',\n  'count'\n]);\n\nproxyCursorRequestMethods(Index, '_index', IDBIndex, [\n  'openCursor',\n  'openKeyCursor'\n]);\n\nfunction Cursor(cursor, request) {\n  this._cursor = cursor;\n  this._request = request;\n}\n\nproxyProperties(Cursor, '_cursor', [\n  'direction',\n  'key',\n  'primaryKey',\n  'value'\n]);\n\nproxyRequestMethods(Cursor, '_cursor', IDBCursor, [\n  'update',\n  'delete'\n]);\n\n// proxy 'next' methods\n['advance', 'continue', 'continuePrimaryKey'].forEach(function(methodName) {\n  if (!(methodName in IDBCursor.prototype)) return;\n  Cursor.prototype[methodName] = function() {\n    var cursor = this;\n    var args = arguments;\n    return Promise.resolve().then(function() {\n      cursor._cursor[methodName].apply(cursor._cursor, args);\n      return promisifyRequest(cursor._request).then(function(value) {\n        if (!value) return;\n        return new Cursor(value, cursor._request);\n      });\n    });\n  };\n});\n\nfunction ObjectStore(store) {\n  this._store = store;\n}\n\nObjectStore.prototype.createIndex = function() {\n  return new Index(this._store.createIndex.apply(this._store, arguments));\n};\n\nObjectStore.prototype.index = function() {\n  return new Index(this._store.index.apply(this._store, arguments));\n};\n\nproxyProperties(ObjectStore, '_store', [\n  'name',\n  'keyPath',\n  'indexNames',\n  'autoIncrement'\n]);\n\nproxyRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n  'put',\n  'add',\n  'delete',\n  'clear',\n  'get',\n  'getAll',\n  'getKey',\n  'getAllKeys',\n  'count'\n]);\n\nproxyCursorRequestMethods(ObjectStore, '_store', IDBObjectStore, [\n  'openCursor',\n  'openKeyCursor'\n]);\n\nproxyMethods(ObjectStore, '_store', IDBObjectStore, [\n  'deleteIndex'\n]);\n\nfunction Transaction(idbTransaction) {\n  this._tx = idbTransaction;\n  this.complete = new Promise(function(resolve, reject) {\n    idbTransaction.oncomplete = function() {\n      resolve();\n    };\n    idbTransaction.onerror = function() {\n      reject(idbTransaction.error);\n    };\n    idbTransaction.onabort = function() {\n      reject(idbTransaction.error);\n    };\n  });\n}\n\nTransaction.prototype.objectStore = function() {\n  return new ObjectStore(this._tx.objectStore.apply(this._tx, arguments));\n};\n\nproxyProperties(Transaction, '_tx', [\n  'objectStoreNames',\n  'mode'\n]);\n\nproxyMethods(Transaction, '_tx', IDBTransaction, [\n  'abort'\n]);\n\nfunction UpgradeDB(db, oldVersion, transaction) {\n  this._db = db;\n  this.oldVersion = oldVersion;\n  this.transaction = new Transaction(transaction);\n}\n\nUpgradeDB.prototype.createObjectStore = function() {\n  return new ObjectStore(this._db.createObjectStore.apply(this._db, arguments));\n};\n\nproxyProperties(UpgradeDB, '_db', [\n  'name',\n  'version',\n  'objectStoreNames'\n]);\n\nproxyMethods(UpgradeDB, '_db', IDBDatabase, [\n  'deleteObjectStore',\n  'close'\n]);\n\nfunction DB(db) {\n  this._db = db;\n}\n\nDB.prototype.transaction = function() {\n  return new Transaction(this._db.transaction.apply(this._db, arguments));\n};\n\nproxyProperties(DB, '_db', [\n  'name',\n  'version',\n  'objectStoreNames'\n]);\n\nproxyMethods(DB, '_db', IDBDatabase, [\n  'close'\n]);\n\n// Add cursor iterators\n// TODO: remove this once browsers do the right thing with promises\n['openCursor', 'openKeyCursor'].forEach(function(funcName) {\n  [ObjectStore, Index].forEach(function(Constructor) {\n    // Don't create iterateKeyCursor if openKeyCursor doesn't exist.\n    if (!(funcName in Constructor.prototype)) return;\n\n    Constructor.prototype[funcName.replace('open', 'iterate')] = function() {\n      var args = toArray(arguments);\n      var callback = args[args.length - 1];\n      var nativeObject = this._store || this._index;\n      var request = nativeObject[funcName].apply(nativeObject, args.slice(0, -1));\n      request.onsuccess = function() {\n        callback(request.result);\n      };\n    };\n  });\n});\n\n// polyfill getAll\n[Index, ObjectStore].forEach(function(Constructor) {\n  if (Constructor.prototype.getAll) return;\n  Constructor.prototype.getAll = function(query, count) {\n    var instance = this;\n    var items = [];\n\n    return new Promise(function(resolve) {\n      instance.iterateCursor(query, function(cursor) {\n        if (!cursor) {\n          resolve(items);\n          return;\n        }\n        items.push(cursor.value);\n\n        if (count !== undefined && items.length == count) {\n          resolve(items);\n          return;\n        }\n        cursor.continue();\n      });\n    });\n  };\n});\n\nexport function openDb(name, version, upgradeCallback) {\n  var p = promisifyRequestCall(indexedDB, 'open', [name, version]);\n  var request = p.request;\n\n  if (request) {\n    request.onupgradeneeded = function(event) {\n      if (upgradeCallback) {\n        upgradeCallback(new UpgradeDB(request.result, event.oldVersion, request.transaction));\n      }\n    };\n  }\n\n  return p.then(function(db) {\n    return new DB(db);\n  });\n}\n\nexport function deleteDb(name) {\n  return promisifyRequestCall(indexedDB, 'deleteDatabase', [name]);\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { version } from '../../package.json';\n\nexport const PENDING_TIMEOUT_MS = 10000;\n\nexport const PACKAGE_VERSION = `w:${version}`;\nexport const INTERNAL_AUTH_VERSION = 'FIS_v2';\n\nexport const INSTALLATIONS_API_URL =\n  'https://firebaseinstallations.googleapis.com/v1';\n\nexport const TOKEN_EXPIRATION_BUFFER = 60 * 60 * 1000; // One hour\n\nexport const SERVICE = 'installations';\nexport const SERVICE_NAME = 'Installations';\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ErrorFactory, FirebaseError } from '@firebase/util';\nimport { SERVICE, SERVICE_NAME } from './constants';\n\nexport const enum ErrorCode {\n  MISSING_APP_CONFIG_VALUES = 'missing-app-config-values',\n  NOT_REGISTERED = 'not-registered',\n  INSTALLATION_NOT_FOUND = 'installation-not-found',\n  REQUEST_FAILED = 'request-failed',\n  APP_OFFLINE = 'app-offline',\n  DELETE_PENDING_REGISTRATION = 'delete-pending-registration'\n}\n\nconst ERROR_DESCRIPTION_MAP: { readonly [key in ErrorCode]: string } = {\n  [ErrorCode.MISSING_APP_CONFIG_VALUES]:\n    'Missing App configuration value: \"{$valueName}\"',\n  [ErrorCode.NOT_REGISTERED]: 'Firebase Installation is not registered.',\n  [ErrorCode.INSTALLATION_NOT_FOUND]: 'Firebase Installation not found.',\n  [ErrorCode.REQUEST_FAILED]:\n    '{$requestName} request failed with error \"{$serverCode} {$serverStatus}: {$serverMessage}\"',\n  [ErrorCode.APP_OFFLINE]: 'Could not process request. Application offline.',\n  [ErrorCode.DELETE_PENDING_REGISTRATION]:\n    \"Can't delete installation while there is a pending registration request.\"\n};\n\ninterface ErrorParams {\n  [ErrorCode.MISSING_APP_CONFIG_VALUES]: {\n    valueName: string;\n  };\n  [ErrorCode.REQUEST_FAILED]: {\n    requestName: string;\n  } & ServerErrorData;\n}\n\nexport const ERROR_FACTORY = new ErrorFactory<ErrorCode, ErrorParams>(\n  SERVICE,\n  SERVICE_NAME,\n  ERROR_DESCRIPTION_MAP\n);\n\nexport interface ServerErrorData {\n  serverCode: number;\n  serverMessage: string;\n  serverStatus: string;\n}\n\nexport type ServerError = FirebaseError & ServerErrorData;\n\n/** Returns true if error is a FirebaseError that is based on an error from the server. */\nexport function isServerError(error: unknown): error is ServerError {\n  return (\n    error instanceof FirebaseError &&\n    error.code.includes(ErrorCode.REQUEST_FAILED)\n  );\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseError } from '@firebase/util';\nimport { GenerateAuthTokenResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n  CompletedAuthToken,\n  RegisteredInstallationEntry,\n  RequestStatus\n} from '../interfaces/installation-entry';\nimport {\n  INSTALLATIONS_API_URL,\n  INTERNAL_AUTH_VERSION\n} from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport function getInstallationsEndpoint({ projectId }: AppConfig): string {\n  return `${INSTALLATIONS_API_URL}/projects/${projectId}/installations`;\n}\n\nexport function extractAuthTokenInfoFromResponse(\n  response: GenerateAuthTokenResponse\n): CompletedAuthToken {\n  return {\n    token: response.token,\n    requestStatus: RequestStatus.COMPLETED,\n    expiresIn: getExpiresInFromResponseExpiresIn(response.expiresIn),\n    creationTime: Date.now()\n  };\n}\n\nexport async function getErrorFromResponse(\n  requestName: string,\n  response: Response\n): Promise<FirebaseError> {\n  const responseJson: ErrorResponse = await response.json();\n  const errorData = responseJson.error;\n  return ERROR_FACTORY.create(ErrorCode.REQUEST_FAILED, {\n    requestName,\n    serverCode: errorData.code,\n    serverMessage: errorData.message,\n    serverStatus: errorData.status\n  });\n}\n\nexport function getHeaders({ apiKey }: AppConfig): Headers {\n  return new Headers({\n    'Content-Type': 'application/json',\n    Accept: 'application/json',\n    'x-goog-api-key': apiKey\n  });\n}\n\nexport function getHeadersWithAuth(\n  appConfig: AppConfig,\n  { refreshToken }: RegisteredInstallationEntry\n): Headers {\n  const headers = getHeaders(appConfig);\n  headers.append('Authorization', getAuthorizationHeader(refreshToken));\n  return headers;\n}\n\nexport interface ErrorResponse {\n  error: {\n    code: number;\n    message: string;\n    status: string;\n  };\n}\n\n/**\n * Calls the passed in fetch wrapper and returns the response.\n * If the returned response has a status of 5xx, re-runs the function once and\n * returns the response.\n */\nexport async function retryIfServerError(\n  fn: () => Promise<Response>\n): Promise<Response> {\n  const result = await fn();\n\n  if (result.status >= 500 && result.status < 600) {\n    // Internal Server Error. Retry request.\n    return fn();\n  }\n\n  return result;\n}\n\nfunction getExpiresInFromResponseExpiresIn(responseExpiresIn: string): number {\n  // This works because the server will never respond with fractions of a second.\n  return Number(responseExpiresIn.replace('s', '000'));\n}\n\nfunction getAuthorizationHeader(refreshToken: string): string {\n  return `${INTERNAL_AUTH_VERSION} ${refreshToken}`;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/** Returns a promise that resolves after given time passes. */\nexport function sleep(ms: number): Promise<void> {\n  return new Promise<void>(resolve => {\n    setTimeout(resolve, ms);\n  });\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport function bufferToBase64UrlSafe(array: Uint8Array): string {\n  const b64 = btoa(String.fromCharCode(...array));\n  return b64.replace(/\\+/g, '-').replace(/\\//g, '_');\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { bufferToBase64UrlSafe } from './buffer-to-base64-url-safe';\n\nexport const VALID_FID_PATTERN = /^[cdef][\\w-]{21}$/;\nexport const INVALID_FID = '';\n\n/**\n * Generates a new FID using random values from Web Crypto API.\n * Returns an empty string if FID generation fails for any reason.\n */\nexport function generateFid(): string {\n  try {\n    // A valid FID has exactly 22 base64 characters, which is 132 bits, or 16.5\n    // bytes. our implementation generates a 17 byte array instead.\n    const fidByteArray = new Uint8Array(17);\n    const crypto =\n      self.crypto || ((self as unknown) as { msCrypto: Crypto }).msCrypto;\n    crypto.getRandomValues(fidByteArray);\n\n    // Replace the first 4 random bits with the constant FID header of 0b0111.\n    fidByteArray[0] = 0b01110000 + (fidByteArray[0] % 0b00010000);\n\n    const fid = encode(fidByteArray);\n\n    return VALID_FID_PATTERN.test(fid) ? fid : INVALID_FID;\n  } catch {\n    // FID generation errored\n    return INVALID_FID;\n  }\n}\n\n/** Converts a FID Uint8Array to a base64 string representation. */\nfunction encode(fidByteArray: Uint8Array): string {\n  const b64String = bufferToBase64UrlSafe(fidByteArray);\n\n  // Remove the 23rd character that was added because of the extra 4 bits at the\n  // end of our 17 byte array, and the '=' padding.\n  return b64String.substr(0, 22);\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AppConfig } from '../interfaces/app-config';\n\n/** Returns a string key that can be used to identify the app. */\nexport function getKey(appConfig: AppConfig): string {\n  return `${appConfig.appName}!${appConfig.appId}`;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getKey } from '../util/get-key';\nimport { AppConfig } from '../interfaces/app-config';\nimport { IdChangeCallbackFn } from '../functions';\n\nconst fidChangeCallbacks: Map<string, Set<IdChangeCallbackFn>> = new Map();\n\n/**\n * Calls the onIdChange callbacks with the new FID value, and broadcasts the\n * change to other tabs.\n */\nexport function fidChanged(appConfig: AppConfig, fid: string): void {\n  const key = getKey(appConfig);\n\n  callFidChangeCallbacks(key, fid);\n  broadcastFidChange(key, fid);\n}\n\nexport function addCallback(\n  appConfig: AppConfig,\n  callback: IdChangeCallbackFn\n): void {\n  // Open the broadcast channel if it's not already open,\n  // to be able to listen to change events from other tabs.\n  getBroadcastChannel();\n\n  const key = getKey(appConfig);\n\n  let callbackSet = fidChangeCallbacks.get(key);\n  if (!callbackSet) {\n    callbackSet = new Set();\n    fidChangeCallbacks.set(key, callbackSet);\n  }\n  callbackSet.add(callback);\n}\n\nexport function removeCallback(\n  appConfig: AppConfig,\n  callback: IdChangeCallbackFn\n): void {\n  const key = getKey(appConfig);\n\n  const callbackSet = fidChangeCallbacks.get(key);\n\n  if (!callbackSet) {\n    return;\n  }\n\n  callbackSet.delete(callback);\n  if (callbackSet.size === 0) {\n    fidChangeCallbacks.delete(key);\n  }\n\n  // Close broadcast channel if there are no more callbacks.\n  closeBroadcastChannel();\n}\n\nfunction callFidChangeCallbacks(key: string, fid: string): void {\n  const callbacks = fidChangeCallbacks.get(key);\n  if (!callbacks) {\n    return;\n  }\n\n  for (const callback of callbacks) {\n    callback(fid);\n  }\n}\n\nfunction broadcastFidChange(key: string, fid: string): void {\n  const channel = getBroadcastChannel();\n  if (channel) {\n    channel.postMessage({ key, fid });\n  }\n  closeBroadcastChannel();\n}\n\nlet broadcastChannel: BroadcastChannel | null = null;\n/** Opens and returns a BroadcastChannel if it is supported by the browser. */\nfunction getBroadcastChannel(): BroadcastChannel | null {\n  if (!broadcastChannel && 'BroadcastChannel' in self) {\n    broadcastChannel = new BroadcastChannel('[Firebase] FID Change');\n    broadcastChannel.onmessage = e => {\n      callFidChangeCallbacks(e.data.key, e.data.fid);\n    };\n  }\n  return broadcastChannel;\n}\n\nfunction closeBroadcastChannel(): void {\n  if (fidChangeCallbacks.size === 0 && broadcastChannel) {\n    broadcastChannel.close();\n    broadcastChannel = null;\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DB, openDb } from 'idb';\nimport { AppConfig } from '../interfaces/app-config';\nimport { InstallationEntry } from '../interfaces/installation-entry';\nimport { getKey } from '../util/get-key';\nimport { fidChanged } from './fid-changed';\n\nconst DATABASE_NAME = 'firebase-installations-database';\nconst DATABASE_VERSION = 1;\nconst OBJECT_STORE_NAME = 'firebase-installations-store';\n\nlet dbPromise: Promise<DB> | null = null;\nfunction getDbPromise(): Promise<DB> {\n  if (!dbPromise) {\n    dbPromise = openDb(DATABASE_NAME, DATABASE_VERSION, upgradeDB => {\n      // We don't use 'break' in this switch statement, the fall-through\n      // behavior is what we want, because if there are multiple versions between\n      // the old version and the current version, we want ALL the migrations\n      // that correspond to those versions to run, not only the last one.\n      // eslint-disable-next-line default-case\n      switch (upgradeDB.oldVersion) {\n        case 0:\n          upgradeDB.createObjectStore(OBJECT_STORE_NAME);\n      }\n    });\n  }\n  return dbPromise;\n}\n\n/** Gets record(s) from the objectStore that match the given key. */\nexport async function get(\n  appConfig: AppConfig\n): Promise<InstallationEntry | undefined> {\n  const key = getKey(appConfig);\n  const db = await getDbPromise();\n  return db\n    .transaction(OBJECT_STORE_NAME)\n    .objectStore(OBJECT_STORE_NAME)\n    .get(key);\n}\n\n/** Assigns or overwrites the record for the given key with the given value. */\nexport async function set<ValueType extends InstallationEntry>(\n  appConfig: AppConfig,\n  value: ValueType\n): Promise<ValueType> {\n  const key = getKey(appConfig);\n  const db = await getDbPromise();\n  const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n  const objectStore = tx.objectStore(OBJECT_STORE_NAME);\n  const oldValue = await objectStore.get(key);\n  await objectStore.put(value, key);\n  await tx.complete;\n\n  if (!oldValue || oldValue.fid !== value.fid) {\n    fidChanged(appConfig, value.fid);\n  }\n\n  return value;\n}\n\n/** Removes record(s) from the objectStore that match the given key. */\nexport async function remove(appConfig: AppConfig): Promise<void> {\n  const key = getKey(appConfig);\n  const db = await getDbPromise();\n  const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n  await tx.objectStore(OBJECT_STORE_NAME).delete(key);\n  await tx.complete;\n}\n\n/**\n * Atomically updates a record with the result of updateFn, which gets\n * called with the current value. If newValue is undefined, the record is\n * deleted instead.\n * @return Updated value\n */\nexport async function update<ValueType extends InstallationEntry | undefined>(\n  appConfig: AppConfig,\n  updateFn: (previousValue: InstallationEntry | undefined) => ValueType\n): Promise<ValueType> {\n  const key = getKey(appConfig);\n  const db = await getDbPromise();\n  const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n  const store = tx.objectStore(OBJECT_STORE_NAME);\n  const oldValue: InstallationEntry | undefined = await store.get(key);\n  const newValue = updateFn(oldValue);\n\n  if (newValue === undefined) {\n    await store.delete(key);\n  } else {\n    await store.put(newValue, key);\n  }\n  await tx.complete;\n\n  if (newValue && (!oldValue || oldValue.fid !== newValue.fid)) {\n    fidChanged(appConfig, newValue.fid);\n  }\n\n  return newValue;\n}\n\nexport async function clear(): Promise<void> {\n  const db = await getDbPromise();\n  const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');\n  await tx.objectStore(OBJECT_STORE_NAME).clear();\n  await tx.complete;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\nimport {\n  _FirebaseNamespace,\n  FirebaseService\n} from '@firebase/app-types/private';\nimport { Component, ComponentType } from '@firebase/component';\nimport { FirebaseInstallations } from '@firebase/installations-types';\nimport {\n  deleteInstallation,\n  getId,\n  getToken,\n  IdChangeCallbackFn,\n  IdChangeUnsubscribeFn,\n  onIdChange\n} from './functions';\nimport { extractAppConfig } from './helpers/extract-app-config';\nimport { FirebaseDependencies } from './interfaces/firebase-dependencies';\n\nimport { name, version } from '../package.json';\n\nexport function registerInstallations(instance: _FirebaseNamespace): void {\n  const installationsName = 'installations';\n\n  instance.INTERNAL.registerComponent(\n    new Component(\n      installationsName,\n      container => {\n        const app = container.getProvider('app').getImmediate();\n\n        // Throws if app isn't configured properly.\n        const appConfig = extractAppConfig(app);\n        const platformLoggerProvider = container.getProvider('platform-logger');\n        const dependencies: FirebaseDependencies = {\n          appConfig,\n          platformLoggerProvider\n        };\n\n        const installations: FirebaseInstallations & FirebaseService = {\n          app,\n          getId: () => getId(dependencies),\n          getToken: (forceRefresh?: boolean) =>\n            getToken(dependencies, forceRefresh),\n          delete: () => deleteInstallation(dependencies),\n          onIdChange: (callback: IdChangeCallbackFn): IdChangeUnsubscribeFn =>\n            onIdChange(dependencies, callback)\n        };\n        return installations;\n      },\n      ComponentType.PUBLIC\n    )\n  );\n\n  instance.registerVersion(name, version);\n}\n\nregisterInstallations(firebase as _FirebaseNamespace);\n\n/**\n * Define extension behavior of `registerInstallations`\n */\ndeclare module '@firebase/app-types' {\n  interface FirebaseNamespace {\n    installations(app?: FirebaseApp): FirebaseInstallations;\n  }\n  interface FirebaseApp {\n    installations(): FirebaseInstallations;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * A container for all of the Logger instances\n */\nexport const instances: Logger[] = [];\n\n/**\n * The JS SDK supports 5 log levels and also allows a user the ability to\n * silence the logs altogether.\n *\n * The order is a follows:\n * DEBUG < VERBOSE < INFO < WARN < ERROR\n *\n * All of the log types above the current log level will be captured (i.e. if\n * you set the log level to `INFO`, errors will still be logged, but `DEBUG` and\n * `VERBOSE` logs will not)\n */\nexport enum LogLevel {\n  DEBUG,\n  VERBOSE,\n  INFO,\n  WARN,\n  ERROR,\n  SILENT\n}\n\n/**\n * The default log level\n */\nconst defaultLogLevel: LogLevel = LogLevel.INFO;\n\n/**\n * We allow users the ability to pass their own log handler. We will pass the\n * type of log, the current log level, and any other arguments passed (i.e. the\n * messages that the user wants to log) to this function.\n */\nexport type LogHandler = (\n  loggerInstance: Logger,\n  logType: LogLevel,\n  ...args: unknown[]\n) => void;\n\n/**\n * The default log handler will forward DEBUG, VERBOSE, INFO, WARN, and ERROR\n * messages on to their corresponding console counterparts (if the log method\n * is supported by the current log level)\n */\nconst defaultLogHandler: LogHandler = (instance, logType, ...args): void => {\n  if (logType < instance.logLevel) {\n    return;\n  }\n  const now = new Date().toISOString();\n  switch (logType) {\n    /**\n     * By default, `console.debug` is not displayed in the developer console (in\n     * chrome). To avoid forcing users to have to opt-in to these logs twice\n     * (i.e. once for firebase, and once in the console), we are sending `DEBUG`\n     * logs to the `console.log` function.\n     */\n    case LogLevel.DEBUG:\n      console.log(`[${now}]  ${instance.name}:`, ...args);\n      break;\n    case LogLevel.VERBOSE:\n      console.log(`[${now}]  ${instance.name}:`, ...args);\n      break;\n    case LogLevel.INFO:\n      console.info(`[${now}]  ${instance.name}:`, ...args);\n      break;\n    case LogLevel.WARN:\n      console.warn(`[${now}]  ${instance.name}:`, ...args);\n      break;\n    case LogLevel.ERROR:\n      console.error(`[${now}]  ${instance.name}:`, ...args);\n      break;\n    default:\n      throw new Error(\n        `Attempted to log a message with an invalid logType (value: ${logType})`\n      );\n  }\n};\n\nexport class Logger {\n  /**\n   * Gives you an instance of a Logger to capture messages according to\n   * Firebase's logging scheme.\n   *\n   * @param name The name that the logs will be associated with\n   */\n  constructor(public name: string) {\n    /**\n     * Capture the current instance for later use\n     */\n    instances.push(this);\n  }\n\n  /**\n   * The log level of the given Logger instance.\n   */\n  private _logLevel = defaultLogLevel;\n  get logLevel(): LogLevel {\n    return this._logLevel;\n  }\n  set logLevel(val: LogLevel) {\n    if (!(val in LogLevel)) {\n      throw new TypeError('Invalid value assigned to `logLevel`');\n    }\n    this._logLevel = val;\n  }\n\n  /**\n   * The log handler for the Logger instance.\n   */\n  private _logHandler: LogHandler = defaultLogHandler;\n  get logHandler(): LogHandler {\n    return this._logHandler;\n  }\n  set logHandler(val: LogHandler) {\n    if (typeof val !== 'function') {\n      throw new TypeError('Value assigned to `logHandler` must be a function');\n    }\n    this._logHandler = val;\n  }\n\n  /**\n   * The functions below are all based on the `console` interface\n   */\n\n  debug(...args: unknown[]): void {\n    this._logHandler(this, LogLevel.DEBUG, ...args);\n  }\n  log(...args: unknown[]): void {\n    this._logHandler(this, LogLevel.VERBOSE, ...args);\n  }\n  info(...args: unknown[]): void {\n    this._logHandler(this, LogLevel.INFO, ...args);\n  }\n  warn(...args: unknown[]): void {\n    this._logHandler(this, LogLevel.WARN, ...args);\n  }\n  error(...args: unknown[]): void {\n    this._logHandler(this, LogLevel.ERROR, ...args);\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { createInstallationRequest } from '../api/create-installation-request';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n  InProgressInstallationEntry,\n  InstallationEntry,\n  RegisteredInstallationEntry,\n  RequestStatus\n} from '../interfaces/installation-entry';\nimport { PENDING_TIMEOUT_MS } from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode, isServerError } from '../util/errors';\nimport { sleep } from '../util/sleep';\nimport { generateFid, INVALID_FID } from './generate-fid';\nimport { remove, set, update } from './idb-manager';\n\nexport interface InstallationEntryWithRegistrationPromise {\n  installationEntry: InstallationEntry;\n  /** Exist iff the installationEntry is not registered. */\n  registrationPromise?: Promise<RegisteredInstallationEntry>;\n}\n\n/**\n * Updates and returns the InstallationEntry from the database.\n * Also triggers a registration request if it is necessary and possible.\n */\nexport async function getInstallationEntry(\n  appConfig: AppConfig\n): Promise<InstallationEntryWithRegistrationPromise> {\n  let registrationPromise: Promise<RegisteredInstallationEntry> | undefined;\n\n  const installationEntry = await update(appConfig, oldEntry => {\n    const installationEntry = updateOrCreateInstallationEntry(oldEntry);\n    const entryWithPromise = triggerRegistrationIfNecessary(\n      appConfig,\n      installationEntry\n    );\n    registrationPromise = entryWithPromise.registrationPromise;\n    return entryWithPromise.installationEntry;\n  });\n\n  if (installationEntry.fid === INVALID_FID) {\n    // FID generation failed. Waiting for the FID from the server.\n    return { installationEntry: await registrationPromise! };\n  }\n\n  return {\n    installationEntry,\n    registrationPromise\n  };\n}\n\n/**\n * Creates a new Installation Entry if one does not exist.\n * Also clears timed out pending requests.\n */\nfunction updateOrCreateInstallationEntry(\n  oldEntry: InstallationEntry | undefined\n): InstallationEntry {\n  const entry: InstallationEntry = oldEntry || {\n    fid: generateFid(),\n    registrationStatus: RequestStatus.NOT_STARTED\n  };\n\n  return clearTimedOutRequest(entry);\n}\n\n/**\n * If the Firebase Installation is not registered yet, this will trigger the\n * registration and return an InProgressInstallationEntry.\n *\n * If registrationPromise does not exist, the installationEntry is guaranteed\n * to be registered.\n */\nfunction triggerRegistrationIfNecessary(\n  appConfig: AppConfig,\n  installationEntry: InstallationEntry\n): InstallationEntryWithRegistrationPromise {\n  if (installationEntry.registrationStatus === RequestStatus.NOT_STARTED) {\n    if (!navigator.onLine) {\n      // Registration required but app is offline.\n      const registrationPromiseWithError = Promise.reject(\n        ERROR_FACTORY.create(ErrorCode.APP_OFFLINE)\n      );\n      return {\n        installationEntry,\n        registrationPromise: registrationPromiseWithError\n      };\n    }\n\n    // Try registering. Change status to IN_PROGRESS.\n    const inProgressEntry: InProgressInstallationEntry = {\n      fid: installationEntry.fid,\n      registrationStatus: RequestStatus.IN_PROGRESS,\n      registrationTime: Date.now()\n    };\n    const registrationPromise = registerInstallation(\n      appConfig,\n      inProgressEntry\n    );\n    return { installationEntry: inProgressEntry, registrationPromise };\n  } else if (\n    installationEntry.registrationStatus === RequestStatus.IN_PROGRESS\n  ) {\n    return {\n      installationEntry,\n      registrationPromise: waitUntilFidRegistration(appConfig)\n    };\n  } else {\n    return { installationEntry };\n  }\n}\n\n/** This will be executed only once for each new Firebase Installation. */\nasync function registerInstallation(\n  appConfig: AppConfig,\n  installationEntry: InProgressInstallationEntry\n): Promise<RegisteredInstallationEntry> {\n  try {\n    const registeredInstallationEntry = await createInstallationRequest(\n      appConfig,\n      installationEntry\n    );\n    return set(appConfig, registeredInstallationEntry);\n  } catch (e) {\n    if (isServerError(e) && e.serverCode === 409) {\n      // Server returned a \"FID can not be used\" error.\n      // Generate a new ID next time.\n      await remove(appConfig);\n    } else {\n      // Registration failed. Set FID as not registered.\n      await set(appConfig, {\n        fid: installationEntry.fid,\n        registrationStatus: RequestStatus.NOT_STARTED\n      });\n    }\n    throw e;\n  }\n}\n\n/** Call if FID registration is pending in another request. */\nasync function waitUntilFidRegistration(\n  appConfig: AppConfig\n): Promise<RegisteredInstallationEntry> {\n  // Unfortunately, there is no way of reliably observing when a value in\n  // IndexedDB changes (yet, see https://github.com/WICG/indexed-db-observers),\n  // so we need to poll.\n\n  let entry: InstallationEntry = await updateInstallationRequest(appConfig);\n  while (entry.registrationStatus === RequestStatus.IN_PROGRESS) {\n    // createInstallation request still in progress.\n    await sleep(100);\n\n    entry = await updateInstallationRequest(appConfig);\n  }\n\n  if (entry.registrationStatus === RequestStatus.NOT_STARTED) {\n    // The request timed out or failed in a different call. Try again.\n    const {\n      installationEntry,\n      registrationPromise\n    } = await getInstallationEntry(appConfig);\n\n    if (registrationPromise) {\n      return registrationPromise;\n    } else {\n      // if there is no registrationPromise, entry is registered.\n      return installationEntry as RegisteredInstallationEntry;\n    }\n  }\n\n  return entry;\n}\n\n/**\n * Called only if there is a CreateInstallation request in progress.\n *\n * Updates the InstallationEntry in the DB based on the status of the\n * CreateInstallation request.\n *\n * Returns the updated InstallationEntry.\n */\nfunction updateInstallationRequest(\n  appConfig: AppConfig\n): Promise<InstallationEntry> {\n  return update(appConfig, oldEntry => {\n    if (!oldEntry) {\n      throw ERROR_FACTORY.create(ErrorCode.INSTALLATION_NOT_FOUND);\n    }\n    return clearTimedOutRequest(oldEntry);\n  });\n}\n\nfunction clearTimedOutRequest(entry: InstallationEntry): InstallationEntry {\n  if (hasInstallationRequestTimedOut(entry)) {\n    return {\n      fid: entry.fid,\n      registrationStatus: RequestStatus.NOT_STARTED\n    };\n  }\n\n  return entry;\n}\n\nfunction hasInstallationRequestTimedOut(\n  installationEntry: InstallationEntry\n): boolean {\n  return (\n    installationEntry.registrationStatus === RequestStatus.IN_PROGRESS &&\n    installationEntry.registrationTime + PENDING_TIMEOUT_MS < Date.now()\n  );\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CreateInstallationResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport {\n  InProgressInstallationEntry,\n  RegisteredInstallationEntry,\n  RequestStatus\n} from '../interfaces/installation-entry';\nimport { INTERNAL_AUTH_VERSION, PACKAGE_VERSION } from '../util/constants';\nimport {\n  extractAuthTokenInfoFromResponse,\n  getErrorFromResponse,\n  getHeaders,\n  getInstallationsEndpoint,\n  retryIfServerError\n} from './common';\n\nexport async function createInstallationRequest(\n  appConfig: AppConfig,\n  { fid }: InProgressInstallationEntry\n): Promise<RegisteredInstallationEntry> {\n  const endpoint = getInstallationsEndpoint(appConfig);\n\n  const headers = getHeaders(appConfig);\n  const body = {\n    fid,\n    authVersion: INTERNAL_AUTH_VERSION,\n    appId: appConfig.appId,\n    sdkVersion: PACKAGE_VERSION\n  };\n\n  const request: RequestInit = {\n    method: 'POST',\n    headers,\n    body: JSON.stringify(body)\n  };\n\n  const response = await retryIfServerError(() => fetch(endpoint, request));\n  if (response.ok) {\n    const responseValue: CreateInstallationResponse = await response.json();\n    const registeredInstallationEntry: RegisteredInstallationEntry = {\n      fid: responseValue.fid || fid,\n      registrationStatus: RequestStatus.COMPLETED,\n      refreshToken: responseValue.refreshToken,\n      authToken: extractAuthTokenInfoFromResponse(responseValue.authToken)\n    };\n    return registeredInstallationEntry;\n  } else {\n    throw await getErrorFromResponse('Create Installation', response);\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { GenerateAuthTokenResponse } from '../interfaces/api-response';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport {\n  CompletedAuthToken,\n  RegisteredInstallationEntry\n} from '../interfaces/installation-entry';\nimport { PACKAGE_VERSION } from '../util/constants';\nimport {\n  extractAuthTokenInfoFromResponse,\n  getErrorFromResponse,\n  getHeadersWithAuth,\n  getInstallationsEndpoint,\n  retryIfServerError\n} from './common';\n\nexport async function generateAuthTokenRequest(\n  { appConfig, platformLoggerProvider }: FirebaseDependencies,\n  installationEntry: RegisteredInstallationEntry\n): Promise<CompletedAuthToken> {\n  const endpoint = getGenerateAuthTokenEndpoint(appConfig, installationEntry);\n\n  const headers = getHeadersWithAuth(appConfig, installationEntry);\n\n  // If platform logger exists, add the platform info string to the header.\n  const platformLogger = platformLoggerProvider.getImmediate({\n    optional: true\n  });\n  if (platformLogger) {\n    headers.append('x-firebase-client', platformLogger.getPlatformInfoString());\n  }\n\n  const body = {\n    installation: {\n      sdkVersion: PACKAGE_VERSION\n    }\n  };\n\n  const request: RequestInit = {\n    method: 'POST',\n    headers,\n    body: JSON.stringify(body)\n  };\n\n  const response = await retryIfServerError(() => fetch(endpoint, request));\n  if (response.ok) {\n    const responseValue: GenerateAuthTokenResponse = await response.json();\n    const completedAuthToken: CompletedAuthToken = extractAuthTokenInfoFromResponse(\n      responseValue\n    );\n    return completedAuthToken;\n  } else {\n    throw await getErrorFromResponse('Generate Auth Token', response);\n  }\n}\n\nfunction getGenerateAuthTokenEndpoint(\n  appConfig: AppConfig,\n  { fid }: RegisteredInstallationEntry\n): string {\n  return `${getInstallationsEndpoint(appConfig)}/${fid}/authTokens:generate`;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { generateAuthTokenRequest } from '../api/generate-auth-token-request';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport {\n  AuthToken,\n  CompletedAuthToken,\n  InProgressAuthToken,\n  InstallationEntry,\n  RegisteredInstallationEntry,\n  RequestStatus\n} from '../interfaces/installation-entry';\nimport { PENDING_TIMEOUT_MS, TOKEN_EXPIRATION_BUFFER } from '../util/constants';\nimport { ERROR_FACTORY, ErrorCode, isServerError } from '../util/errors';\nimport { sleep } from '../util/sleep';\nimport { remove, set, update } from './idb-manager';\n\n/**\n * Returns a valid authentication token for the installation. Generates a new\n * token if one doesn't exist, is expired or about to expire.\n *\n * Should only be called if the Firebase Installation is registered.\n */\nexport async function refreshAuthToken(\n  dependencies: FirebaseDependencies,\n  forceRefresh = false\n): Promise<CompletedAuthToken> {\n  let tokenPromise: Promise<CompletedAuthToken> | undefined;\n  const entry = await update(dependencies.appConfig, oldEntry => {\n    if (!isEntryRegistered(oldEntry)) {\n      throw ERROR_FACTORY.create(ErrorCode.NOT_REGISTERED);\n    }\n\n    const oldAuthToken = oldEntry.authToken;\n    if (!forceRefresh && isAuthTokenValid(oldAuthToken)) {\n      // There is a valid token in the DB.\n      return oldEntry;\n    } else if (oldAuthToken.requestStatus === RequestStatus.IN_PROGRESS) {\n      // There already is a token request in progress.\n      tokenPromise = waitUntilAuthTokenRequest(dependencies, forceRefresh);\n      return oldEntry;\n    } else {\n      // No token or token expired.\n      if (!navigator.onLine) {\n        throw ERROR_FACTORY.create(ErrorCode.APP_OFFLINE);\n      }\n\n      const inProgressEntry = makeAuthTokenRequestInProgressEntry(oldEntry);\n      tokenPromise = fetchAuthTokenFromServer(dependencies, inProgressEntry);\n      return inProgressEntry;\n    }\n  });\n\n  const authToken = tokenPromise\n    ? await tokenPromise\n    : (entry.authToken as CompletedAuthToken);\n  return authToken;\n}\n\n/**\n * Call only if FID is registered and Auth Token request is in progress.\n *\n * Waits until the current pending request finishes. If the request times out,\n * tries once in this thread as well.\n */\nasync function waitUntilAuthTokenRequest(\n  dependencies: FirebaseDependencies,\n  forceRefresh: boolean\n): Promise<CompletedAuthToken> {\n  // Unfortunately, there is no way of reliably observing when a value in\n  // IndexedDB changes (yet, see https://github.com/WICG/indexed-db-observers),\n  // so we need to poll.\n\n  let entry = await updateAuthTokenRequest(dependencies.appConfig);\n  while (entry.authToken.requestStatus === RequestStatus.IN_PROGRESS) {\n    // generateAuthToken still in progress.\n    await sleep(100);\n\n    entry = await updateAuthTokenRequest(dependencies.appConfig);\n  }\n\n  const authToken = entry.authToken;\n  if (authToken.requestStatus === RequestStatus.NOT_STARTED) {\n    // The request timed out or failed in a different call. Try again.\n    return refreshAuthToken(dependencies, forceRefresh);\n  } else {\n    return authToken;\n  }\n}\n\n/**\n * Called only if there is a GenerateAuthToken request in progress.\n *\n * Updates the InstallationEntry in the DB based on the status of the\n * GenerateAuthToken request.\n *\n * Returns the updated InstallationEntry.\n */\nfunction updateAuthTokenRequest(\n  appConfig: AppConfig\n): Promise<RegisteredInstallationEntry> {\n  return update(appConfig, oldEntry => {\n    if (!isEntryRegistered(oldEntry)) {\n      throw ERROR_FACTORY.create(ErrorCode.NOT_REGISTERED);\n    }\n\n    const oldAuthToken = oldEntry.authToken;\n    if (hasAuthTokenRequestTimedOut(oldAuthToken)) {\n      return {\n        ...oldEntry,\n        authToken: { requestStatus: RequestStatus.NOT_STARTED }\n      };\n    }\n\n    return oldEntry;\n  });\n}\n\nasync function fetchAuthTokenFromServer(\n  dependencies: FirebaseDependencies,\n  installationEntry: RegisteredInstallationEntry\n): Promise<CompletedAuthToken> {\n  try {\n    const authToken = await generateAuthTokenRequest(\n      dependencies,\n      installationEntry\n    );\n    const updatedInstallationEntry: RegisteredInstallationEntry = {\n      ...installationEntry,\n      authToken\n    };\n    await set(dependencies.appConfig, updatedInstallationEntry);\n    return authToken;\n  } catch (e) {\n    if (isServerError(e) && (e.serverCode === 401 || e.serverCode === 404)) {\n      // Server returned a \"FID not found\" or a \"Invalid authentication\" error.\n      // Generate a new ID next time.\n      await remove(dependencies.appConfig);\n    } else {\n      const updatedInstallationEntry: RegisteredInstallationEntry = {\n        ...installationEntry,\n        authToken: { requestStatus: RequestStatus.NOT_STARTED }\n      };\n      await set(dependencies.appConfig, updatedInstallationEntry);\n    }\n    throw e;\n  }\n}\n\nfunction isEntryRegistered(\n  installationEntry: InstallationEntry | undefined\n): installationEntry is RegisteredInstallationEntry {\n  return (\n    installationEntry !== undefined &&\n    installationEntry.registrationStatus === RequestStatus.COMPLETED\n  );\n}\n\nfunction isAuthTokenValid(authToken: AuthToken): boolean {\n  return (\n    authToken.requestStatus === RequestStatus.COMPLETED &&\n    !isAuthTokenExpired(authToken)\n  );\n}\n\nfunction isAuthTokenExpired(authToken: CompletedAuthToken): boolean {\n  const now = Date.now();\n  return (\n    now < authToken.creationTime ||\n    authToken.creationTime + authToken.expiresIn < now + TOKEN_EXPIRATION_BUFFER\n  );\n}\n\n/** Returns an updated InstallationEntry with an InProgressAuthToken. */\nfunction makeAuthTokenRequestInProgressEntry(\n  oldEntry: RegisteredInstallationEntry\n): RegisteredInstallationEntry {\n  const inProgressAuthToken: InProgressAuthToken = {\n    requestStatus: RequestStatus.IN_PROGRESS,\n    requestTime: Date.now()\n  };\n  return {\n    ...oldEntry,\n    authToken: inProgressAuthToken\n  };\n}\n\nfunction hasAuthTokenRequestTimedOut(authToken: AuthToken): boolean {\n  return (\n    authToken.requestStatus === RequestStatus.IN_PROGRESS &&\n    authToken.requestTime + PENDING_TIMEOUT_MS < Date.now()\n  );\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getInstallationEntry } from '../helpers/get-installation-entry';\nimport { refreshAuthToken } from '../helpers/refresh-auth-token';\nimport { AppConfig } from '../interfaces/app-config';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport async function getToken(\n  dependencies: FirebaseDependencies,\n  forceRefresh = false\n): Promise<string> {\n  await completeInstallationRegistration(dependencies.appConfig);\n\n  // At this point we either have a Registered Installation in the DB, or we've\n  // already thrown an error.\n  const authToken = await refreshAuthToken(dependencies, forceRefresh);\n  return authToken.token;\n}\n\nasync function completeInstallationRegistration(\n  appConfig: AppConfig\n): Promise<void> {\n  const { registrationPromise } = await getInstallationEntry(appConfig);\n\n  if (registrationPromise) {\n    // A createInstallation request is in progress. Wait until it finishes.\n    await registrationPromise;\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AppConfig } from '../interfaces/app-config';\nimport { RegisteredInstallationEntry } from '../interfaces/installation-entry';\nimport {\n  getErrorFromResponse,\n  getHeadersWithAuth,\n  getInstallationsEndpoint,\n  retryIfServerError\n} from './common';\n\nexport async function deleteInstallationRequest(\n  appConfig: AppConfig,\n  installationEntry: RegisteredInstallationEntry\n): Promise<void> {\n  const endpoint = getDeleteEndpoint(appConfig, installationEntry);\n\n  const headers = getHeadersWithAuth(appConfig, installationEntry);\n  const request: RequestInit = {\n    method: 'DELETE',\n    headers\n  };\n\n  const response = await retryIfServerError(() => fetch(endpoint, request));\n  if (!response.ok) {\n    throw await getErrorFromResponse('Delete Installation', response);\n  }\n}\n\nfunction getDeleteEndpoint(\n  appConfig: AppConfig,\n  { fid }: RegisteredInstallationEntry\n): string {\n  return `${getInstallationsEndpoint(appConfig)}/${fid}`;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { addCallback, removeCallback } from '../helpers/fid-changed';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport type IdChangeCallbackFn = (installationId: string) => void;\nexport type IdChangeUnsubscribeFn = () => void;\n\n/**\n * Sets a new callback that will get called when Installation ID changes.\n * Returns an unsubscribe function that will remove the callback when called.\n */\nexport function onIdChange(\n  { appConfig }: FirebaseDependencies,\n  callback: IdChangeCallbackFn\n): IdChangeUnsubscribeFn {\n  addCallback(appConfig, callback);\n\n  return () => {\n    removeCallback(appConfig, callback);\n  };\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseApp, FirebaseOptions } from '@firebase/app-types';\nimport { FirebaseError } from '@firebase/util';\nimport { AppConfig } from '../interfaces/app-config';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport function extractAppConfig(app: FirebaseApp): AppConfig {\n  if (!app || !app.options) {\n    throw getMissingValueError('App Configuration');\n  }\n\n  if (!app.name) {\n    throw getMissingValueError('App Name');\n  }\n\n  // Required app config keys\n  const configKeys: Array<keyof FirebaseOptions> = [\n    'projectId',\n    'apiKey',\n    'appId'\n  ];\n\n  for (const keyName of configKeys) {\n    if (!app.options[keyName]) {\n      throw getMissingValueError(keyName);\n    }\n  }\n\n  return {\n    appName: app.name,\n    projectId: app.options.projectId!,\n    apiKey: app.options.apiKey!,\n    appId: app.options.appId!\n  };\n}\n\nfunction getMissingValueError(valueName: string): FirebaseError {\n  return ERROR_FACTORY.create(ErrorCode.MISSING_APP_CONFIG_VALUES, {\n    valueName\n  });\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getInstallationEntry } from '../helpers/get-installation-entry';\nimport { refreshAuthToken } from '../helpers/refresh-auth-token';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\n\nexport async function getId(\n  dependencies: FirebaseDependencies\n): Promise<string> {\n  const { installationEntry, registrationPromise } = await getInstallationEntry(\n    dependencies.appConfig\n  );\n\n  if (registrationPromise) {\n    registrationPromise.catch(console.error);\n  } else {\n    // If the installation is already registered, update the authentication\n    // token if needed.\n    refreshAuthToken(dependencies).catch(console.error);\n  }\n\n  return installationEntry.fid;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { deleteInstallationRequest } from '../api/delete-installation-request';\nimport { remove, update } from '../helpers/idb-manager';\nimport { FirebaseDependencies } from '../interfaces/firebase-dependencies';\nimport { RequestStatus } from '../interfaces/installation-entry';\nimport { ERROR_FACTORY, ErrorCode } from '../util/errors';\n\nexport async function deleteInstallation(\n  dependencies: FirebaseDependencies\n): Promise<void> {\n  const { appConfig } = dependencies;\n\n  const entry = await update(appConfig, oldEntry => {\n    if (oldEntry && oldEntry.registrationStatus === RequestStatus.NOT_STARTED) {\n      // Delete the unregistered entry without sending a deleteInstallation request.\n      return undefined;\n    }\n    return oldEntry;\n  });\n\n  if (entry) {\n    if (entry.registrationStatus === RequestStatus.IN_PROGRESS) {\n      // Can't delete while trying to register.\n      throw ERROR_FACTORY.create(ErrorCode.DELETE_PENDING_REGISTRATION);\n    } else if (entry.registrationStatus === RequestStatus.COMPLETED) {\n      if (!navigator.onLine) {\n        throw ERROR_FACTORY.create(ErrorCode.APP_OFFLINE);\n      } else {\n        await deleteInstallationRequest(appConfig, entry);\n        await remove(appConfig);\n      }\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { StorageCache } from '../storage/storage_cache';\nimport {\n  FetchResponse,\n  RemoteConfigFetchClient,\n  FetchRequest\n} from './remote_config_fetch_client';\nimport { Storage } from '../storage/storage';\nimport { Logger } from '@firebase/logger';\n\n/**\n * Implements the {@link RemoteConfigClient} abstraction with success response caching.\n *\n * <p>Comparable to the browser's Cache API for responses, but the Cache API requires a Service\n * Worker, which requires HTTPS, which would significantly complicate SDK installation. Also, the\n * Cache API doesn't support matching entries by time.\n */\nexport class CachingClient implements RemoteConfigFetchClient {\n  constructor(\n    private readonly client: RemoteConfigFetchClient,\n    private readonly storage: Storage,\n    private readonly storageCache: StorageCache,\n    private readonly logger: Logger\n  ) {}\n\n  /**\n   * Returns true if the age of the cached fetched configs is less than or equal to\n   * {@link Settings#minimumFetchIntervalInSeconds}.\n   *\n   * <p>This is comparable to passing `headers = { 'Cache-Control': max-age <maxAge> }` to the\n   * native Fetch API.\n   *\n   * <p>Visible for testing.\n   */\n  isCachedDataFresh(\n    cacheMaxAgeMillis: number,\n    lastSuccessfulFetchTimestampMillis: number | undefined\n  ): boolean {\n    // Cache can only be fresh if it's populated.\n    if (!lastSuccessfulFetchTimestampMillis) {\n      this.logger.debug('Config fetch cache check. Cache unpopulated.');\n      return false;\n    }\n\n    // Calculates age of cache entry.\n    const cacheAgeMillis = Date.now() - lastSuccessfulFetchTimestampMillis;\n\n    const isCachedDataFresh = cacheAgeMillis <= cacheMaxAgeMillis;\n\n    this.logger.debug(\n      'Config fetch cache check.' +\n        ` Cache age millis: ${cacheAgeMillis}.` +\n        ` Cache max age millis (minimumFetchIntervalMillis setting): ${cacheMaxAgeMillis}.` +\n        ` Is cache hit: ${isCachedDataFresh}.`\n    );\n\n    return isCachedDataFresh;\n  }\n\n  async fetch(request: FetchRequest): Promise<FetchResponse> {\n    // Reads from persisted storage to avoid cache miss if callers don't wait on initialization.\n    const [\n      lastSuccessfulFetchTimestampMillis,\n      lastSuccessfulFetchResponse\n    ] = await Promise.all([\n      this.storage.getLastSuccessfulFetchTimestampMillis(),\n      this.storage.getLastSuccessfulFetchResponse()\n    ]);\n\n    // Exits early on cache hit.\n    if (\n      lastSuccessfulFetchResponse &&\n      this.isCachedDataFresh(\n        request.cacheMaxAgeMillis,\n        lastSuccessfulFetchTimestampMillis\n      )\n    ) {\n      return lastSuccessfulFetchResponse;\n    }\n\n    // Deviates from pure decorator by not honoring a passed ETag since we don't have a public API\n    // that allows the caller to pass an ETag.\n    request.eTag =\n      lastSuccessfulFetchResponse && lastSuccessfulFetchResponse.eTag;\n\n    // Falls back to service on cache miss.\n    const response = await this.client.fetch(request);\n\n    // Fetch throws for non-success responses, so success is guaranteed here.\n\n    const storageOperations = [\n      // Uses write-through cache for consistency with synchronous public API.\n      this.storageCache.setLastSuccessfulFetchTimestampMillis(Date.now())\n    ];\n\n    if (response.status === 200) {\n      // Caches response only if it has changed, ie non-304 responses.\n      storageOperations.push(\n        this.storage.setLastSuccessfulFetchResponse(response)\n      );\n    }\n\n    await Promise.all(storageOperations);\n\n    return response;\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ErrorFactory, FirebaseError } from '@firebase/util';\n\nexport const enum ErrorCode {\n  REGISTRATION_WINDOW = 'registration-window',\n  REGISTRATION_PROJECT_ID = 'registration-project-id',\n  REGISTRATION_API_KEY = 'registration-api-key',\n  REGISTRATION_APP_ID = 'registration-app-id',\n  STORAGE_OPEN = 'storage-open',\n  STORAGE_GET = 'storage-get',\n  STORAGE_SET = 'storage-set',\n  STORAGE_DELETE = 'storage-delete',\n  FETCH_NETWORK = 'fetch-client-network',\n  FETCH_TIMEOUT = 'fetch-timeout',\n  FETCH_THROTTLE = 'fetch-throttle',\n  FETCH_PARSE = 'fetch-client-parse',\n  FETCH_STATUS = 'fetch-status'\n}\n\nconst ERROR_DESCRIPTION_MAP: { readonly [key in ErrorCode]: string } = {\n  [ErrorCode.REGISTRATION_WINDOW]:\n    'Undefined window object. This SDK only supports usage in a browser environment.',\n  [ErrorCode.REGISTRATION_PROJECT_ID]:\n    'Undefined project identifier. Check Firebase app initialization.',\n  [ErrorCode.REGISTRATION_API_KEY]:\n    'Undefined API key. Check Firebase app initialization.',\n  [ErrorCode.REGISTRATION_APP_ID]:\n    'Undefined app identifier. Check Firebase app initialization.',\n  [ErrorCode.STORAGE_OPEN]:\n    'Error thrown when opening storage. Original error: {$originalErrorMessage}.',\n  [ErrorCode.STORAGE_GET]:\n    'Error thrown when reading from storage. Original error: {$originalErrorMessage}.',\n  [ErrorCode.STORAGE_SET]:\n    'Error thrown when writing to storage. Original error: {$originalErrorMessage}.',\n  [ErrorCode.STORAGE_DELETE]:\n    'Error thrown when deleting from storage. Original error: {$originalErrorMessage}.',\n  [ErrorCode.FETCH_NETWORK]:\n    'Fetch client failed to connect to a network. Check Internet connection.' +\n    ' Original error: {$originalErrorMessage}.',\n  [ErrorCode.FETCH_TIMEOUT]:\n    'The config fetch request timed out. ' +\n    ' Configure timeout using \"fetchTimeoutMillis\" SDK setting.',\n  [ErrorCode.FETCH_THROTTLE]:\n    'The config fetch request timed out while in an exponential backoff state.' +\n    ' Configure timeout using \"fetchTimeoutMillis\" SDK setting.' +\n    ' Unix timestamp in milliseconds when fetch request throttling ends: {$throttleEndTimeMillis}.',\n  [ErrorCode.FETCH_PARSE]:\n    'Fetch client could not parse response.' +\n    ' Original error: {$originalErrorMessage}.',\n  [ErrorCode.FETCH_STATUS]:\n    'Fetch server returned an HTTP error status. HTTP status: {$httpStatus}.'\n};\n\n// Note this is effectively a type system binding a code to params. This approach overlaps with the\n// role of TS interfaces, but works well for a few reasons:\n// 1) JS is unaware of TS interfaces, eg we can't test for interface implementation in JS\n// 2) callers should have access to a human-readable summary of the error and this interpolates\n//    params into an error message;\n// 3) callers should be able to programmatically access data associated with an error, which\n//    ErrorData provides.\ninterface ErrorParams {\n  [ErrorCode.STORAGE_OPEN]: { originalErrorMessage: string | undefined };\n  [ErrorCode.STORAGE_GET]: { originalErrorMessage: string | undefined };\n  [ErrorCode.STORAGE_SET]: { originalErrorMessage: string | undefined };\n  [ErrorCode.STORAGE_DELETE]: { originalErrorMessage: string | undefined };\n  [ErrorCode.FETCH_NETWORK]: { originalErrorMessage: string };\n  [ErrorCode.FETCH_THROTTLE]: { throttleEndTimeMillis: number };\n  [ErrorCode.FETCH_PARSE]: { originalErrorMessage: string };\n  [ErrorCode.FETCH_STATUS]: { httpStatus: number };\n}\n\nexport const ERROR_FACTORY = new ErrorFactory<ErrorCode, ErrorParams>(\n  'remoteconfig' /* service */,\n  'Remote Config' /* service name */,\n  ERROR_DESCRIPTION_MAP\n);\n\n// Note how this is like typeof/instanceof, but for ErrorCode.\nexport function hasErrorCode(e: Error, errorCode: ErrorCode): boolean {\n  return e instanceof FirebaseError && e.code.indexOf(errorCode) !== -1;\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseInstallations } from '@firebase/installations-types';\nimport {\n  FetchResponse,\n  RemoteConfigFetchClient,\n  FirebaseRemoteConfigObject,\n  FetchRequest\n} from './remote_config_fetch_client';\nimport { ERROR_FACTORY, ErrorCode } from '../errors';\nimport { getUserLanguage } from '../language';\n\n/**\n * Defines request body parameters required to call the fetch API:\n * https://firebase.google.com/docs/reference/remote-config/rest\n *\n * <p>Not exported because this file encapsulates REST API specifics.\n *\n * <p>Not passing User Properties because Analytics' source of truth on Web is server-side.\n */\ninterface FetchRequestBody {\n  // Disables camelcase linting for request body params.\n  /* eslint-disable camelcase*/\n  sdk_version: string;\n  app_instance_id: string;\n  app_instance_id_token: string;\n  app_id: string;\n  language_code: string;\n  /* eslint-enable camelcase */\n}\n\n/**\n * Implements the Client abstraction for the Remote Config REST API.\n */\nexport class RestClient implements RemoteConfigFetchClient {\n  constructor(\n    private readonly firebaseInstallations: FirebaseInstallations,\n    private readonly sdkVersion: string,\n    private readonly namespace: string,\n    private readonly projectId: string,\n    private readonly apiKey: string,\n    private readonly appId: string\n  ) {}\n\n  /**\n   * Fetches from the Remote Config REST API.\n   *\n   * @throws a {@link ErrorCode.FETCH_NETWORK} error if {@link GlobalFetch#fetch} can't\n   * connect to the network.\n   * @throws a {@link ErrorCode.FETCH_PARSE} error if {@link Response#json} can't parse the\n   * fetch response.\n   * @throws a {@link ErrorCode.FETCH_STATUS} error if the service returns an HTTP error status.\n   */\n  async fetch(request: FetchRequest): Promise<FetchResponse> {\n    const [installationId, installationToken] = await Promise.all([\n      this.firebaseInstallations.getId(),\n      this.firebaseInstallations.getToken()\n    ]);\n\n    const urlBase =\n      window.FIREBASE_REMOTE_CONFIG_URL_BASE ||\n      'https://firebaseremoteconfig.googleapis.com';\n\n    const url = `${urlBase}/v1/projects/${this.projectId}/namespaces/${this.namespace}:fetch?key=${this.apiKey}`;\n\n    const headers = {\n      'Content-Type': 'application/json',\n      'Content-Encoding': 'gzip',\n      // Deviates from pure decorator by not passing max-age header since we don't currently have\n      // service behavior using that header.\n      'If-None-Match': request.eTag || '*'\n    };\n\n    const requestBody: FetchRequestBody = {\n      /* eslint-disable camelcase */\n      sdk_version: this.sdkVersion,\n      app_instance_id: installationId,\n      app_instance_id_token: installationToken,\n      app_id: this.appId,\n      language_code: getUserLanguage()\n      /* eslint-enable camelcase */\n    };\n\n    const options = {\n      method: 'POST',\n      headers,\n      body: JSON.stringify(requestBody)\n    };\n\n    // This logic isn't REST-specific, but shimming abort logic isn't worth another decorator.\n    const fetchPromise = fetch(url, options);\n    const timeoutPromise = new Promise((_resolve, reject) => {\n      // Maps async event listener to Promise API.\n      request.signal.addEventListener(() => {\n        // Emulates https://heycam.github.io/webidl/#aborterror\n        const error = new Error('The operation was aborted.');\n        error.name = 'AbortError';\n        reject(error);\n      });\n    });\n\n    let response;\n    try {\n      await Promise.race([fetchPromise, timeoutPromise]);\n      response = await fetchPromise;\n    } catch (originalError) {\n      let errorCode = ErrorCode.FETCH_NETWORK;\n      if (originalError.name === 'AbortError') {\n        errorCode = ErrorCode.FETCH_TIMEOUT;\n      }\n      throw ERROR_FACTORY.create(errorCode, {\n        originalErrorMessage: originalError.message\n      });\n    }\n\n    let status = response.status;\n\n    // Normalizes nullable header to optional.\n    const responseEtag = response.headers.get('ETag') || undefined;\n\n    let config: FirebaseRemoteConfigObject | undefined;\n    let state: string | undefined;\n\n    // JSON parsing throws SyntaxError if the response body isn't a JSON string.\n    // Requesting application/json and checking for a 200 ensures there's JSON data.\n    if (response.status === 200) {\n      let responseBody;\n      try {\n        responseBody = await response.json();\n      } catch (originalError) {\n        throw ERROR_FACTORY.create(ErrorCode.FETCH_PARSE, {\n          originalErrorMessage: originalError.message\n        });\n      }\n      config = responseBody['entries'];\n      state = responseBody['state'];\n    }\n\n    // Normalizes based on legacy state.\n    if (state === 'INSTANCE_STATE_UNSPECIFIED') {\n      status = 500;\n    } else if (state === 'NO_CHANGE') {\n      status = 304;\n    } else if (state === 'NO_TEMPLATE' || state === 'EMPTY_CONFIG') {\n      // These cases can be fixed remotely, so normalize to safe value.\n      config = {};\n    }\n\n    // Normalize to exception-based control flow for non-success cases.\n    // Encapsulates HTTP specifics in this class as much as possible. Status is still the best for\n    // differentiating success states (200 from 304; the state body param is undefined in a\n    // standard 304).\n    if (status !== 304 && status !== 200) {\n      throw ERROR_FACTORY.create(ErrorCode.FETCH_STATUS, {\n        httpStatus: status\n      });\n    }\n\n    return { status, eTag: responseEtag, config };\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Attempts to get the most accurate browser language setting.\n *\n * <p>Adapted from getUserLanguage in packages/auth/src/utils.js for TypeScript.\n *\n * <p>Defers default language specification to server logic for consistency.\n *\n * @param navigatorLanguage Enables tests to override read-only {@link NavigatorLanguage}.\n */\nexport function getUserLanguage(\n  navigatorLanguage: NavigatorLanguage = navigator\n): string {\n  return (\n    // Most reliable, but only supported in Chrome/Firefox.\n    (navigatorLanguage.languages && navigatorLanguage.languages[0]) ||\n    // Supported in most browsers, but returns the language of the browser\n    // UI, not the language set in browser settings.\n    navigatorLanguage.language\n    // Polyfill otherwise.\n  );\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Defines a client, as in https://en.wikipedia.org/wiki/Client%E2%80%93server_model, for the\n * Remote Config server (https://firebase.google.com/docs/reference/remote-config/rest).\n *\n * <p>Abstracts throttle, response cache and network implementation details.\n *\n * <p>Modeled after the native {@link GlobalFetch} interface, which is relatively modern and\n * convenient, but simplified for Remote Config's use case.\n *\n * Disambiguation: {@link GlobalFetch} interface and the Remote Config service define \"fetch\"\n * methods. The RestClient uses the former to make HTTP calls. This interface abstracts the latter.\n */\nexport interface RemoteConfigFetchClient {\n  /**\n   * @throws if response status is not 200 or 304.\n   */\n  fetch(request: FetchRequest): Promise<FetchResponse>;\n}\n\n/**\n * Defines a self-descriptive reference for config key-value pairs.\n */\nexport interface FirebaseRemoteConfigObject {\n  [key: string]: string;\n}\n\n/**\n * Shims a minimal AbortSignal.\n *\n * <p>AbortController's AbortSignal conveniently decouples fetch timeout logic from other aspects\n * of networking, such as retries. Firebase doesn't use AbortController enough to justify a\n * polyfill recommendation, like we do with the Fetch API, but this minimal shim can easily be\n * swapped out if/when we do.\n */\nexport class RemoteConfigAbortSignal {\n  listeners: Array<() => void> = [];\n  addEventListener(listener: () => void): void {\n    this.listeners.push(listener);\n  }\n  abort(): void {\n    this.listeners.forEach(listener => listener());\n  }\n}\n\n/**\n * Defines per-request inputs for the Remote Config fetch request.\n *\n * <p>Modeled after the native {@link Request} interface, but simplified for Remote Config's\n * use case.\n */\nexport interface FetchRequest {\n  /**\n   * Uses cached config if it is younger than this age.\n   *\n   * <p>Required because it's defined by settings, which always have a value.\n   *\n   * <p>Comparable to passing `headers = { 'Cache-Control': max-age <maxAge> }` to the native\n   * Fetch API.\n   */\n  cacheMaxAgeMillis: number;\n\n  /**\n   * An event bus for the signal to abort a request.\n   *\n   * <p>Required because all requests should be abortable.\n   *\n   * <p>Comparable to the native\n   * Fetch API's \"signal\" field on its request configuration object\n   * https://fetch.spec.whatwg.org/#dom-requestinit-signal.\n   *\n   * <p>Disambiguation: Remote Config commonly refers to API inputs as\n   * \"signals\". See the private ConfigFetchRequestBody interface for those:\n   * http://google3/firebase/remote_config/web/src/core/rest_client.ts?l=14&rcl=255515243.\n   */\n  signal: RemoteConfigAbortSignal;\n\n  /**\n   * The ETag header value from the last response.\n   *\n   * <p>Optional in case this is the first request.\n   *\n   * <p>Comparable to passing `headers = { 'If-None-Match': <eTag> }` to the native Fetch API.\n   */\n  eTag?: string;\n}\n\n/**\n * Defines a successful response (200 or 304).\n *\n * <p>Modeled after the native {@link Response} interface, but simplified for Remote Config's\n * use case.\n */\nexport interface FetchResponse {\n  /**\n   * The HTTP status, which is useful for differentiating success responses with data from\n   * those without.\n   *\n   * <p>{@link RemoteConfigClient} is modeled after the native {@link GlobalFetch} interface, so\n   * HTTP status is first-class.\n   *\n   * <p>Disambiguation: the fetch response returns a legacy \"state\" value that is redundant with the\n   * HTTP status code. The former is normalized into the latter.\n   */\n  status: number;\n\n  /**\n   * Defines the ETag response header value.\n   *\n   * <p>Only defined for 200 and 304 responses.\n   */\n  eTag?: string;\n\n  /**\n   * Defines the map of parameters returned as \"entries\" in the fetch response body.\n   *\n   * <p>Only defined for 200 responses.\n   */\n  config?: FirebaseRemoteConfigObject;\n\n  // Note: we're not extracting experiment metadata until\n  // ABT and Analytics have Web SDKs.\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Value as ValueType, ValueSource } from '@firebase/remote-config-types';\n\nconst DEFAULT_VALUE_FOR_BOOLEAN = false;\nconst DEFAULT_VALUE_FOR_STRING = '';\nconst DEFAULT_VALUE_FOR_NUMBER = 0;\n\nconst BOOLEAN_TRUTHY_VALUES = ['1', 'true', 't', 'yes', 'y', 'on'];\n\nexport class Value implements ValueType {\n  constructor(\n    private readonly _source: ValueSource,\n    private readonly _value: string = DEFAULT_VALUE_FOR_STRING\n  ) {}\n\n  asString(): string {\n    return this._value;\n  }\n\n  asBoolean(): boolean {\n    if (this._source === 'static') {\n      return DEFAULT_VALUE_FOR_BOOLEAN;\n    }\n    return BOOLEAN_TRUTHY_VALUES.indexOf(this._value.toLowerCase()) >= 0;\n  }\n\n  asNumber(): number {\n    if (this._source === 'static') {\n      return DEFAULT_VALUE_FOR_NUMBER;\n    }\n    let num = Number(this._value);\n    if (isNaN(num)) {\n      num = DEFAULT_VALUE_FOR_NUMBER;\n    }\n    return num;\n  }\n\n  getSource(): ValueSource {\n    return this._source;\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseApp } from '@firebase/app-types';\nimport {\n  RemoteConfig as RemoteConfigType,\n  FetchStatus,\n  Settings,\n  Value as ValueType,\n  LogLevel as RemoteConfigLogLevel\n} from '@firebase/remote-config-types';\nimport { StorageCache } from './storage/storage_cache';\nimport {\n  RemoteConfigFetchClient,\n  RemoteConfigAbortSignal\n} from './client/remote_config_fetch_client';\nimport { Value } from './value';\nimport { ErrorCode, hasErrorCode } from './errors';\nimport { Storage } from './storage/storage';\nimport { Logger, LogLevel as FirebaseLogLevel } from '@firebase/logger';\n\nconst DEFAULT_FETCH_TIMEOUT_MILLIS = 60 * 1000; // One minute\nconst DEFAULT_CACHE_MAX_AGE_MILLIS = 12 * 60 * 60 * 1000; // Twelve hours.\n\n/**\n * Encapsulates business logic mapping network and storage dependencies to the public SDK API.\n *\n * See {@link https://github.com/FirebasePrivate/firebase-js-sdk/blob/master/packages/firebase/index.d.ts|interface documentation} for method descriptions.\n */\nexport class RemoteConfig implements RemoteConfigType {\n  // Tracks completion of initialization promise.\n  private _isInitializationComplete = false;\n\n  // De-duplicates initialization calls.\n  private _initializePromise?: Promise<void>;\n\n  settings: Settings = {\n    fetchTimeoutMillis: DEFAULT_FETCH_TIMEOUT_MILLIS,\n    minimumFetchIntervalMillis: DEFAULT_CACHE_MAX_AGE_MILLIS\n  };\n\n  defaultConfig: { [key: string]: string | number | boolean } = {};\n\n  // Based on packages/firestore/src/util/log.ts but not static because we need per-instance levels\n  // to differentiate 2p and 3p use-cases.\n  setLogLevel(logLevel: RemoteConfigLogLevel): void {\n    switch (logLevel) {\n      case 'debug':\n        this._logger.logLevel = FirebaseLogLevel.DEBUG;\n        break;\n      case 'silent':\n        this._logger.logLevel = FirebaseLogLevel.SILENT;\n        break;\n      default:\n        this._logger.logLevel = FirebaseLogLevel.ERROR;\n    }\n  }\n\n  get fetchTimeMillis(): number {\n    return this._storageCache.getLastSuccessfulFetchTimestampMillis() || -1;\n  }\n\n  get lastFetchStatus(): FetchStatus {\n    return this._storageCache.getLastFetchStatus() || 'no-fetch-yet';\n  }\n\n  constructor(\n    // Required by FirebaseServiceFactory interface.\n    readonly app: FirebaseApp,\n    // JS doesn't support private yet\n    // (https://github.com/tc39/proposal-class-fields#private-fields), so we hint using an\n    // underscore prefix.\n    private readonly _client: RemoteConfigFetchClient,\n    private readonly _storageCache: StorageCache,\n    private readonly _storage: Storage,\n    private readonly _logger: Logger\n  ) {}\n\n  async activate(): Promise<boolean> {\n    const [lastSuccessfulFetchResponse, activeConfigEtag] = await Promise.all([\n      this._storage.getLastSuccessfulFetchResponse(),\n      this._storage.getActiveConfigEtag()\n    ]);\n    if (\n      !lastSuccessfulFetchResponse ||\n      !lastSuccessfulFetchResponse.config ||\n      !lastSuccessfulFetchResponse.eTag ||\n      lastSuccessfulFetchResponse.eTag === activeConfigEtag\n    ) {\n      // Either there is no successful fetched config, or is the same as current active\n      // config.\n      return false;\n    }\n    await Promise.all([\n      this._storageCache.setActiveConfig(lastSuccessfulFetchResponse.config),\n      this._storage.setActiveConfigEtag(lastSuccessfulFetchResponse.eTag)\n    ]);\n    return true;\n  }\n\n  ensureInitialized(): Promise<void> {\n    if (!this._initializePromise) {\n      this._initializePromise = this._storageCache\n        .loadFromStorage()\n        .then(() => {\n          this._isInitializationComplete = true;\n        });\n    }\n    return this._initializePromise;\n  }\n\n  /**\n   * @throws a {@link ErrorCode.FETCH_CLIENT_TIMEOUT} if the request takes longer than\n   * {@link Settings.fetchTimeoutInSeconds} or\n   * {@link DEFAULT_FETCH_TIMEOUT_SECONDS}.\n   */\n  async fetch(): Promise<void> {\n    // Aborts the request after the given timeout, causing the fetch call to\n    // reject with an AbortError.\n    //\n    // <p>Aborting after the request completes is a no-op, so we don't need a\n    // corresponding clearTimeout.\n    //\n    // Locating abort logic here because:\n    // * it uses a developer setting (timeout)\n    // * it applies to all retries (like curl's max-time arg)\n    // * it is consistent with the Fetch API's signal input\n    const abortSignal = new RemoteConfigAbortSignal();\n\n    setTimeout(async () => {\n      // Note a very low delay, eg < 10ms, can elapse before listeners are initialized.\n      abortSignal.abort();\n    }, this.settings.fetchTimeoutMillis);\n\n    // Catches *all* errors thrown by client so status can be set consistently.\n    try {\n      await this._client.fetch({\n        cacheMaxAgeMillis: this.settings.minimumFetchIntervalMillis,\n        signal: abortSignal\n      });\n\n      await this._storageCache.setLastFetchStatus('success');\n    } catch (e) {\n      const lastFetchStatus = hasErrorCode(e, ErrorCode.FETCH_THROTTLE)\n        ? 'throttle'\n        : 'failure';\n      await this._storageCache.setLastFetchStatus(lastFetchStatus);\n      throw e;\n    }\n  }\n\n  async fetchAndActivate(): Promise<boolean> {\n    await this.fetch();\n    return this.activate();\n  }\n\n  getAll(): { [key: string]: ValueType } {\n    return getAllKeys(\n      this._storageCache.getActiveConfig(),\n      this.defaultConfig\n    ).reduce((allConfigs, key) => {\n      allConfigs[key] = this.getValue(key);\n      return allConfigs;\n    }, {} as { [key: string]: ValueType });\n  }\n\n  getBoolean(key: string): boolean {\n    return this.getValue(key).asBoolean();\n  }\n\n  getNumber(key: string): number {\n    return this.getValue(key).asNumber();\n  }\n\n  getString(key: string): string {\n    return this.getValue(key).asString();\n  }\n\n  getValue(key: string): ValueType {\n    if (!this._isInitializationComplete) {\n      this._logger.debug(\n        `A value was requested for key \"${key}\" before SDK initialization completed.` +\n          ' Await on ensureInitialized if the intent was to get a previously activated value.'\n      );\n    }\n    const activeConfig = this._storageCache.getActiveConfig();\n    if (activeConfig && activeConfig[key] !== undefined) {\n      return new Value('remote', activeConfig[key]);\n    } else if (this.defaultConfig && this.defaultConfig[key] !== undefined) {\n      return new Value('default', String(this.defaultConfig[key]));\n    }\n    this._logger.debug(\n      `Returning static value for key \"${key}\".` +\n        ' Define a default or remote value if this is unintentional.'\n    );\n    return new Value('static');\n  }\n}\n\n/**\n * Dedupes and returns an array of all the keys of the received objects.\n */\nfunction getAllKeys(obj1: {} = {}, obj2: {} = {}): string[] {\n  return Object.keys({ ...obj1, ...obj2 });\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FetchStatus } from '@firebase/remote-config-types';\nimport {\n  FetchResponse,\n  FirebaseRemoteConfigObject\n} from '../client/remote_config_fetch_client';\nimport { ERROR_FACTORY, ErrorCode } from '../errors';\nimport { FirebaseError } from '@firebase/util';\n\n/**\n * Converts an error event associated with a {@link IDBRequest} to a {@link FirebaseError}.\n */\nfunction toFirebaseError(event: Event, errorCode: ErrorCode): FirebaseError {\n  const originalError = (event.target as IDBRequest).error || undefined;\n  return ERROR_FACTORY.create(errorCode, {\n    originalErrorMessage: originalError && originalError.message\n  });\n}\n\n/**\n * A general-purpose store keyed by app + namespace + {@link\n * ProjectNamespaceKeyFieldValue}.\n *\n * <p>The Remote Config SDK can be used with multiple app installations, and each app can interact\n * with multiple namespaces, so this store uses app (ID + name) and namespace as common parent keys\n * for a set of key-value pairs. See {@link Storage#createCompositeKey}.\n *\n * <p>Visible for testing.\n */\nexport const APP_NAMESPACE_STORE = 'app_namespace_store';\n\nconst DB_NAME = 'firebase_remote_config';\nconst DB_VERSION = 1;\n\n/**\n * Encapsulates metadata concerning throttled fetch requests.\n */\nexport interface ThrottleMetadata {\n  // The number of times fetch has backed off. Used for resuming backoff after a timeout.\n  backoffCount: number;\n  // The Unix timestamp in milliseconds when callers can retry a request.\n  throttleEndTimeMillis: number;\n}\n\n/**\n * Provides type-safety for the \"key\" field used by {@link APP_NAMESPACE_STORE}.\n *\n * <p>This seems like a small price to avoid potentially subtle bugs caused by a typo.\n */\ntype ProjectNamespaceKeyFieldValue =\n  | 'active_config'\n  | 'active_config_etag'\n  | 'last_fetch_status'\n  | 'last_successful_fetch_timestamp_millis'\n  | 'last_successful_fetch_response'\n  | 'settings'\n  | 'throttle_metadata';\n\n// Visible for testing.\nexport function openDatabase(): Promise<IDBDatabase> {\n  return new Promise((resolve, reject) => {\n    const request = indexedDB.open(DB_NAME, DB_VERSION);\n    request.onerror = event => {\n      reject(toFirebaseError(event, ErrorCode.STORAGE_OPEN));\n    };\n    request.onsuccess = event => {\n      resolve((event.target as IDBOpenDBRequest).result);\n    };\n    request.onupgradeneeded = event => {\n      const db = (event.target as IDBOpenDBRequest).result;\n\n      // We don't use 'break' in this switch statement, the fall-through\n      // behavior is what we want, because if there are multiple versions between\n      // the old version and the current version, we want ALL the migrations\n      // that correspond to those versions to run, not only the last one.\n      // eslint-disable-next-line default-case\n      switch (event.oldVersion) {\n        case 0:\n          db.createObjectStore(APP_NAMESPACE_STORE, {\n            keyPath: 'compositeKey'\n          });\n      }\n    };\n  });\n}\n\n/**\n * Abstracts data persistence.\n */\nexport class Storage {\n  /**\n   * @param appId enables storage segmentation by app (ID + name).\n   * @param appName enables storage segmentation by app (ID + name).\n   * @param namespace enables storage segmentation by namespace.\n   */\n  constructor(\n    private readonly appId: string,\n    private readonly appName: string,\n    private readonly namespace: string,\n    private readonly openDbPromise = openDatabase()\n  ) {}\n\n  getLastFetchStatus(): Promise<FetchStatus | undefined> {\n    return this.get<FetchStatus>('last_fetch_status');\n  }\n\n  setLastFetchStatus(status: FetchStatus): Promise<void> {\n    return this.set<FetchStatus>('last_fetch_status', status);\n  }\n\n  // This is comparable to a cache entry timestamp. If we need to expire other data, we could\n  // consider adding timestamp to all storage records and an optional max age arg to getters.\n  getLastSuccessfulFetchTimestampMillis(): Promise<number | undefined> {\n    return this.get<number>('last_successful_fetch_timestamp_millis');\n  }\n\n  setLastSuccessfulFetchTimestampMillis(timestamp: number): Promise<void> {\n    return this.set<number>(\n      'last_successful_fetch_timestamp_millis',\n      timestamp\n    );\n  }\n\n  getLastSuccessfulFetchResponse(): Promise<FetchResponse | undefined> {\n    return this.get<FetchResponse>('last_successful_fetch_response');\n  }\n\n  setLastSuccessfulFetchResponse(response: FetchResponse): Promise<void> {\n    return this.set<FetchResponse>('last_successful_fetch_response', response);\n  }\n\n  getActiveConfig(): Promise<FirebaseRemoteConfigObject | undefined> {\n    return this.get<FirebaseRemoteConfigObject>('active_config');\n  }\n\n  setActiveConfig(config: FirebaseRemoteConfigObject): Promise<void> {\n    return this.set<FirebaseRemoteConfigObject>('active_config', config);\n  }\n\n  getActiveConfigEtag(): Promise<string | undefined> {\n    return this.get<string>('active_config_etag');\n  }\n\n  setActiveConfigEtag(etag: string): Promise<void> {\n    return this.set<string>('active_config_etag', etag);\n  }\n\n  getThrottleMetadata(): Promise<ThrottleMetadata | undefined> {\n    return this.get<ThrottleMetadata>('throttle_metadata');\n  }\n\n  setThrottleMetadata(metadata: ThrottleMetadata): Promise<void> {\n    return this.set<ThrottleMetadata>('throttle_metadata', metadata);\n  }\n\n  deleteThrottleMetadata(): Promise<void> {\n    return this.delete('throttle_metadata');\n  }\n\n  async get<T>(key: ProjectNamespaceKeyFieldValue): Promise<T | undefined> {\n    const db = await this.openDbPromise;\n    return new Promise((resolve, reject) => {\n      const transaction = db.transaction([APP_NAMESPACE_STORE], 'readonly');\n      const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n      const compositeKey = this.createCompositeKey(key);\n      try {\n        const request = objectStore.get(compositeKey);\n        request.onerror = event => {\n          reject(toFirebaseError(event, ErrorCode.STORAGE_GET));\n        };\n        request.onsuccess = event => {\n          const result = (event.target as IDBRequest).result;\n          if (result) {\n            resolve(result.value);\n          } else {\n            resolve(undefined);\n          }\n        };\n      } catch (e) {\n        reject(\n          ERROR_FACTORY.create(ErrorCode.STORAGE_GET, {\n            originalErrorMessage: e && e.message\n          })\n        );\n      }\n    });\n  }\n\n  async set<T>(key: ProjectNamespaceKeyFieldValue, value: T): Promise<void> {\n    const db = await this.openDbPromise;\n    return new Promise((resolve, reject) => {\n      const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');\n      const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n      const compositeKey = this.createCompositeKey(key);\n      try {\n        const request = objectStore.put({\n          compositeKey,\n          value\n        });\n        request.onerror = (event: Event) => {\n          reject(toFirebaseError(event, ErrorCode.STORAGE_SET));\n        };\n        request.onsuccess = () => {\n          resolve();\n        };\n      } catch (e) {\n        reject(\n          ERROR_FACTORY.create(ErrorCode.STORAGE_SET, {\n            originalErrorMessage: e && e.message\n          })\n        );\n      }\n    });\n  }\n\n  async delete(key: ProjectNamespaceKeyFieldValue): Promise<void> {\n    const db = await this.openDbPromise;\n    return new Promise((resolve, reject) => {\n      const transaction = db.transaction([APP_NAMESPACE_STORE], 'readwrite');\n      const objectStore = transaction.objectStore(APP_NAMESPACE_STORE);\n      const compositeKey = this.createCompositeKey(key);\n      try {\n        const request = objectStore.delete(compositeKey);\n        request.onerror = (event: Event) => {\n          reject(toFirebaseError(event, ErrorCode.STORAGE_DELETE));\n        };\n        request.onsuccess = () => {\n          resolve();\n        };\n      } catch (e) {\n        reject(\n          ERROR_FACTORY.create(ErrorCode.STORAGE_DELETE, {\n            originalErrorMessage: e && e.message\n          })\n        );\n      }\n    });\n  }\n\n  // Facilitates composite key functionality (which is unsupported in IE).\n  createCompositeKey(key: ProjectNamespaceKeyFieldValue): string {\n    return [this.appId, this.appName, this.namespace, key].join();\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FetchStatus } from '@firebase/remote-config-types';\nimport { FirebaseRemoteConfigObject } from '../client/remote_config_fetch_client';\nimport { Storage } from './storage';\n\n/**\n * A memory cache layer over storage to support the SDK's synchronous read requirements.\n */\nexport class StorageCache {\n  constructor(private readonly storage: Storage) {}\n\n  /**\n   * Memory caches.\n   */\n  private lastFetchStatus?: FetchStatus;\n  private lastSuccessfulFetchTimestampMillis?: number;\n  private activeConfig?: FirebaseRemoteConfigObject;\n\n  /**\n   * Memory-only getters\n   */\n  getLastFetchStatus(): FetchStatus | undefined {\n    return this.lastFetchStatus;\n  }\n\n  getLastSuccessfulFetchTimestampMillis(): number | undefined {\n    return this.lastSuccessfulFetchTimestampMillis;\n  }\n\n  getActiveConfig(): FirebaseRemoteConfigObject | undefined {\n    return this.activeConfig;\n  }\n\n  /**\n   * Read-ahead getter\n   */\n  async loadFromStorage(): Promise<void> {\n    const lastFetchStatusPromise = this.storage.getLastFetchStatus();\n    const lastSuccessfulFetchTimestampMillisPromise = this.storage.getLastSuccessfulFetchTimestampMillis();\n    const activeConfigPromise = this.storage.getActiveConfig();\n\n    // Note:\n    // 1. we consistently check for undefined to avoid clobbering defined values\n    //   in memory\n    // 2. we defer awaiting to improve readability, as opposed to destructuring\n    //   a Promise.all result, for example\n\n    const lastFetchStatus = await lastFetchStatusPromise;\n    if (lastFetchStatus) {\n      this.lastFetchStatus = lastFetchStatus;\n    }\n\n    const lastSuccessfulFetchTimestampMillis = await lastSuccessfulFetchTimestampMillisPromise;\n    if (lastSuccessfulFetchTimestampMillis) {\n      this.lastSuccessfulFetchTimestampMillis = lastSuccessfulFetchTimestampMillis;\n    }\n\n    const activeConfig = await activeConfigPromise;\n    if (activeConfig) {\n      this.activeConfig = activeConfig;\n    }\n  }\n\n  /**\n   * Write-through setters\n   */\n  setLastFetchStatus(status: FetchStatus): Promise<void> {\n    this.lastFetchStatus = status;\n    return this.storage.setLastFetchStatus(status);\n  }\n\n  setLastSuccessfulFetchTimestampMillis(\n    timestampMillis: number\n  ): Promise<void> {\n    this.lastSuccessfulFetchTimestampMillis = timestampMillis;\n    return this.storage.setLastSuccessfulFetchTimestampMillis(timestampMillis);\n  }\n\n  setActiveConfig(activeConfig: FirebaseRemoteConfigObject): Promise<void> {\n    this.activeConfig = activeConfig;\n    return this.storage.setActiveConfig(activeConfig);\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  RemoteConfigAbortSignal,\n  RemoteConfigFetchClient,\n  FetchResponse,\n  FetchRequest\n} from './remote_config_fetch_client';\nimport { ThrottleMetadata, Storage } from '../storage/storage';\nimport { calculateBackoffMillis } from './exponential_backoff';\nimport { ErrorCode, ERROR_FACTORY } from '../errors';\nimport { FirebaseError } from '@firebase/util';\n\n/**\n * Supports waiting on a backoff by:\n *\n * <ul>\n *   <li>Promisifying setTimeout, so we can set a timeout in our Promise chain</li>\n *   <li>Listening on a signal bus for abort events, just like the Fetch API</li>\n *   <li>Failing in the same way the Fetch API fails, so timing out a live request and a throttled\n *       request appear the same.</li>\n * </ul>\n *\n * <p>Visible for testing.\n */\nexport function setAbortableTimeout(\n  signal: RemoteConfigAbortSignal,\n  throttleEndTimeMillis: number\n): Promise<void> {\n  return new Promise((resolve, reject) => {\n    // Derives backoff from given end time, normalizing negative numbers to zero.\n    const backoffMillis = Math.max(throttleEndTimeMillis - Date.now(), 0);\n\n    const timeout = setTimeout(resolve, backoffMillis);\n\n    // Adds listener, rather than sets onabort, because signal is a shared object.\n    signal.addEventListener(() => {\n      clearTimeout(timeout);\n\n      // If the request completes before this timeout, the rejection has no effect.\n      reject(\n        ERROR_FACTORY.create(ErrorCode.FETCH_THROTTLE, {\n          throttleEndTimeMillis\n        })\n      );\n    });\n  });\n}\n\n/**\n * Returns true if the {@link Error} indicates a fetch request may succeed later.\n */\nfunction isRetriableError(e: Error): boolean {\n  if (!(e instanceof FirebaseError)) {\n    return false;\n  }\n\n  // Uses string index defined by ErrorData, which FirebaseError implements.\n  const httpStatus = Number(e['httpStatus']);\n\n  return (\n    httpStatus === 429 ||\n    httpStatus === 500 ||\n    httpStatus === 503 ||\n    httpStatus === 504\n  );\n}\n\n/**\n * Decorates a Client with retry logic.\n *\n * <p>Comparable to CachingClient, but uses backoff logic instead of cache max age and doesn't cache\n * responses (because the SDK has no use for error responses).\n */\nexport class RetryingClient implements RemoteConfigFetchClient {\n  constructor(\n    private readonly client: RemoteConfigFetchClient,\n    private readonly storage: Storage\n  ) {}\n\n  async fetch(request: FetchRequest): Promise<FetchResponse> {\n    const throttleMetadata = (await this.storage.getThrottleMetadata()) || {\n      backoffCount: 0,\n      throttleEndTimeMillis: Date.now()\n    };\n\n    return this.attemptFetch(request, throttleMetadata);\n  }\n\n  /**\n   * A recursive helper for attempting a fetch request repeatedly.\n   *\n   * @throws any non-retriable errors.\n   */\n  async attemptFetch(\n    request: FetchRequest,\n    { throttleEndTimeMillis, backoffCount }: ThrottleMetadata\n  ): Promise<FetchResponse> {\n    // Starts with a (potentially zero) timeout to support resumption from stored state.\n    // Ensures the throttle end time is honored if the last attempt timed out.\n    // Note the SDK will never make a request if the fetch timeout expires at this point.\n    await setAbortableTimeout(request.signal, throttleEndTimeMillis);\n\n    try {\n      const response = await this.client.fetch(request);\n\n      // Note the SDK only clears throttle state if response is success or non-retriable.\n      await this.storage.deleteThrottleMetadata();\n\n      return response;\n    } catch (e) {\n      if (!isRetriableError(e)) {\n        throw e;\n      }\n\n      // Increments backoff state.\n      const throttleMetadata = {\n        throttleEndTimeMillis:\n          Date.now() + calculateBackoffMillis(backoffCount),\n        backoffCount: backoffCount + 1\n      };\n\n      // Persists state.\n      await this.storage.setThrottleMetadata(throttleMetadata);\n\n      return this.attemptFetch(request, throttleMetadata);\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * The amount of milliseconds to exponentially increase.\n */\nconst INTERVAL_MILLIS = 1000;\n\n/**\n * The factor to backoff by.\n * Should be a number greater than 1.\n */\nconst BACKOFF_FACTOR = 2;\n\n/**\n * The maximum milliseconds to increase to.\n *\n * <p>Visible for testing\n */\nexport const MAX_VALUE_MILLIS = 4 * 60 * 60 * 1000; // Four hours, like iOS and Android.\n\n/**\n * The percentage of backoff time to randomize by.\n * See\n * http://go/safe-client-behavior#step-1-determine-the-appropriate-retry-interval-to-handle-spike-traffic\n * for context.\n *\n * <p>Visible for testing\n */\nexport const RANDOM_FACTOR = 0.5;\n\n/**\n * Based on the backoff method from\n * https://github.com/google/closure-library/blob/master/closure/goog/math/exponentialbackoff.js.\n * Extracted here so we don't need to pass metadata and a stateful ExponentialBackoff object around.\n */\nexport function calculateBackoffMillis(backoffCount: number): number {\n  // Calculates an exponentially increasing value.\n  // Deviation: calculates value from count and a constant interval, so we only need to save value\n  // and count to restore state.\n  const currBaseValue =\n    INTERVAL_MILLIS * Math.pow(BACKOFF_FACTOR, backoffCount);\n\n  // A random \"fuzz\" to avoid waves of retries.\n  // Deviation: randomFactor is required.\n  const randomWait = Math.round(\n    // A fraction of the backoff value to add/subtract.\n    // Deviation: changes multiplication order to improve readability.\n    RANDOM_FACTOR *\n      currBaseValue *\n      // A random float (rounded to int by Math.round above) in the range [-1, 1]. Determines\n      // if we add or subtract.\n      (Math.random() - 0.5) *\n      2\n  );\n\n  // Limits backoff to max to avoid effectively permanent backoff.\n  return Math.min(MAX_VALUE_MILLIS, currBaseValue + randomWait);\n}\n","/**\n * @license\n * Copyright 2019 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\nimport '@firebase/installations';\nimport { _FirebaseNamespace } from '@firebase/app-types/private';\nimport { RemoteConfig as RemoteConfigType } from '@firebase/remote-config-types';\nimport { CachingClient } from './src/client/caching_client';\nimport { RestClient } from './src/client/rest_client';\nimport { RemoteConfig } from './src/remote_config';\nimport { Storage } from './src/storage/storage';\nimport { StorageCache } from './src/storage/storage_cache';\nimport { ERROR_FACTORY, ErrorCode } from './src/errors';\nimport { RetryingClient } from './src/client/retrying_client';\nimport { Logger, LogLevel as FirebaseLogLevel } from '@firebase/logger';\nimport { name as packageName, version } from './package.json';\nimport {\n  Component,\n  ComponentType,\n  ComponentContainer\n} from '@firebase/component';\n\n// Facilitates debugging by enabling settings changes without rebuilding asset.\n// Note these debug options are not part of a documented, supported API and can change at any time.\n// Consolidates debug options for easier discovery.\n// Uses 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environments.\n    if (typeof window === 'undefined') {\n      throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_WINDOW);\n    }\n\n    // Normalizes optional inputs.\n    const { projectId, apiKey, appId } = app.options;\n    if (!projectId) {\n      throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_PROJECT_ID);\n    }\n    if (!apiKey) {\n      throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_API_KEY);\n    }\n    if (!appId) {\n      throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_APP_ID);\n    }\n    namespace = namespace || 'firebase';\n\n    const storage = new Storage(appId, app.name, namespace);\n    const storageCache = new StorageCache(storage);\n\n    const logger = new Logger(packageName);\n\n    // Sets ERROR as the default log level.\n    // See RemoteConfig#setLogLevel for corresponding normalization to ERROR log level.\n    logger.logLevel = FirebaseLogLevel.ERROR;\n\n    const restClient = new RestClient(\n      installations,\n      // Uses the JS SDK version, by which the RC package version can be deduced, if necessary.\n      firebaseInstance.SDK_VERSION,\n      namespace,\n      projectId,\n      apiKey,\n      appId\n    );\n    const retryingClient = new RetryingClient(restClient, storage);\n    const cachingClient = new CachingClient(\n      retryingClient,\n      storage,\n      storageCache,\n      logger\n    );\n\n    const remoteConfigInstance = new RemoteConfig(\n      app,\n      cachingClient,\n      storageCache,\n      storage,\n      logger\n    );\n\n    // Starts warming cache.\n    // eslint-disable-next-line @typescript-eslint/no-floating-promises\n    remoteConfigInstance.ensureInitialized();\n\n    return remoteConfigInstance;\n  }\n}\n\nregisterRemoteConfig(firebase as _FirebaseNamespace);\n\ndeclare module '@firebase/app-types' {\n  interface FirebaseNamespace {\n    remoteConfig?: {\n      (app?: FirebaseApp): RemoteConfigType;\n    };\n  }\n  interface FirebaseApp {\n    remoteConfig(): RemoteConfigType;\n  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