| 1 |
- {"version":3,"file":"index.esm2017.js","sources":["../../src/client/remote_config_fetch_client.ts","../../src/constants.ts","../../src/errors.ts","../../src/value.ts","../../src/api.ts","../../src/client/caching_client.ts","../../src/language.ts","../../src/client/rest_client.ts","../../src/client/retrying_client.ts","../../src/remote_config.ts","../../src/storage/storage.ts","../../src/storage/storage_cache.ts","../../src/register.ts","../../src/api2.ts","../../src/index.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2019 Google LLC\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 2020 Google LLC\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 const RC_COMPONENT_NAME = 'remote-config';\n","/**\n * @license\n * Copyright 2019 Google LLC\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 INDEXED_DB_UNAVAILABLE = 'indexed-db-unavailable'\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 [ErrorCode.INDEXED_DB_UNAVAILABLE]:\n 'Indexed DB is not supported by current browser'\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 LLC\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 2020 Google LLC\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 { _getProvider, FirebaseApp, getApp } from '@firebase/app';\nimport {\n LogLevel as RemoteConfigLogLevel,\n RemoteConfig,\n Value\n} from './public_types';\nimport { RemoteConfigAbortSignal } from './client/remote_config_fetch_client';\nimport { RC_COMPONENT_NAME } from './constants';\nimport { ErrorCode, hasErrorCode } from './errors';\nimport { RemoteConfig as RemoteConfigImpl } from './remote_config';\nimport { Value as ValueImpl } from './value';\nimport { LogLevel as FirebaseLogLevel } from '@firebase/logger';\nimport { getModularInstance } from '@firebase/util';\n\n/**\n *\n * @param app - The {@link @firebase/app#FirebaseApp} instance.\n * @returns A {@link RemoteConfig} instance.\n *\n * @public\n */\nexport function getRemoteConfig(app: FirebaseApp = getApp()): RemoteConfig {\n app = getModularInstance(app);\n const rcProvider = _getProvider(app, RC_COMPONENT_NAME);\n return rcProvider.getImmediate();\n}\n\n/**\n * Makes the last fetched config available to the getters.\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @returns A `Promise` which resolves to true if the current call activated the fetched configs.\n * If the fetched configs were already activated, the `Promise` will resolve to false.\n *\n * @public\n */\nexport async function activate(remoteConfig: RemoteConfig): Promise<boolean> {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\n const [lastSuccessfulFetchResponse, activeConfigEtag] = await Promise.all([\n rc._storage.getLastSuccessfulFetchResponse(),\n rc._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 rc._storageCache.setActiveConfig(lastSuccessfulFetchResponse.config),\n rc._storage.setActiveConfigEtag(lastSuccessfulFetchResponse.eTag)\n ]);\n return true;\n}\n\n/**\n * Ensures the last activated config are available to the getters.\n * @param remoteConfig - The {@link RemoteConfig} instance.\n *\n * @returns A `Promise` that resolves when the last activated config is available to the getters.\n * @public\n */\nexport function ensureInitialized(remoteConfig: RemoteConfig): Promise<void> {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\n if (!rc._initializePromise) {\n rc._initializePromise = rc._storageCache.loadFromStorage().then(() => {\n rc._isInitializationComplete = true;\n });\n }\n return rc._initializePromise;\n}\n\n/**\n * Fetches and caches configuration from the Remote Config service.\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @public\n */\nexport async function fetchConfig(remoteConfig: RemoteConfig): Promise<void> {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\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 }, rc.settings.fetchTimeoutMillis);\n\n // Catches *all* errors thrown by client so status can be set consistently.\n try {\n await rc._client.fetch({\n cacheMaxAgeMillis: rc.settings.minimumFetchIntervalMillis,\n signal: abortSignal\n });\n\n await rc._storageCache.setLastFetchStatus('success');\n } catch (e) {\n const lastFetchStatus = hasErrorCode(e as Error, ErrorCode.FETCH_THROTTLE)\n ? 'throttle'\n : 'failure';\n await rc._storageCache.setLastFetchStatus(lastFetchStatus);\n throw e;\n }\n}\n\n/**\n * Gets all config.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @returns All config.\n *\n * @public\n */\nexport function getAll(remoteConfig: RemoteConfig): Record<string, Value> {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\n return getAllKeys(\n rc._storageCache.getActiveConfig(),\n rc.defaultConfig\n ).reduce((allConfigs, key) => {\n allConfigs[key] = getValue(remoteConfig, key);\n return allConfigs;\n }, {} as Record<string, Value>);\n}\n\n/**\n * Gets the value for the given key as a boolean.\n *\n * Convenience method for calling <code>remoteConfig.getValue(key).asBoolean()</code>.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @param key - The name of the parameter.\n *\n * @returns The value for the given key as a boolean.\n * @public\n */\nexport function getBoolean(remoteConfig: RemoteConfig, key: string): boolean {\n return getValue(getModularInstance(remoteConfig), key).asBoolean();\n}\n\n/**\n * Gets the value for the given key as a number.\n *\n * Convenience method for calling <code>remoteConfig.getValue(key).asNumber()</code>.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @param key - The name of the parameter.\n *\n * @returns The value for the given key as a number.\n *\n * @public\n */\nexport function getNumber(remoteConfig: RemoteConfig, key: string): number {\n return getValue(getModularInstance(remoteConfig), key).asNumber();\n}\n\n/**\n * Gets the value for the given key as a string.\n * Convenience method for calling <code>remoteConfig.getValue(key).asString()</code>.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @param key - The name of the parameter.\n *\n * @returns The value for the given key as a string.\n *\n * @public\n */\nexport function getString(remoteConfig: RemoteConfig, key: string): string {\n return getValue(getModularInstance(remoteConfig), key).asString();\n}\n\n/**\n * Gets the {@link Value} for the given key.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @param key - The name of the parameter.\n *\n * @returns The value for the given key.\n *\n * @public\n */\nexport function getValue(remoteConfig: RemoteConfig, key: string): Value {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\n if (!rc._isInitializationComplete) {\n rc._logger.debug(\n `A value was requested for key \"${key}\" before SDK initialization completed.` +\n ' Await on ensureInitialized if the intent was to get a previously activated value.'\n );\n }\n const activeConfig = rc._storageCache.getActiveConfig();\n if (activeConfig && activeConfig[key] !== undefined) {\n return new ValueImpl('remote', activeConfig[key]);\n } else if (rc.defaultConfig && rc.defaultConfig[key] !== undefined) {\n return new ValueImpl('default', String(rc.defaultConfig[key]));\n }\n rc._logger.debug(\n `Returning static value for key \"${key}\".` +\n ' Define a default or remote value if this is unintentional.'\n );\n return new ValueImpl('static');\n}\n\n/**\n * Defines the log level to use.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n * @param logLevel - The log level to set.\n *\n * @public\n */\nexport function setLogLevel(\n remoteConfig: RemoteConfig,\n logLevel: RemoteConfigLogLevel\n): void {\n const rc = getModularInstance(remoteConfig) as RemoteConfigImpl;\n switch (logLevel) {\n case 'debug':\n rc._logger.logLevel = FirebaseLogLevel.DEBUG;\n break;\n case 'silent':\n rc._logger.logLevel = FirebaseLogLevel.SILENT;\n break;\n default:\n rc._logger.logLevel = FirebaseLogLevel.ERROR;\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 LLC\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 [lastSuccessfulFetchTimestampMillis, 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 LLC\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 LLC\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 FetchResponse,\n RemoteConfigFetchClient,\n FirebaseRemoteConfigObject,\n FetchRequest\n} from './remote_config_fetch_client';\nimport { ERROR_FACTORY, ErrorCode } from '../errors';\nimport { getUserLanguage } from '../language';\nimport { _FirebaseInstallationsInternal } from '@firebase/installations';\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: _FirebaseInstallationsInternal,\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 as Error)?.name === 'AbortError') {\n errorCode = ErrorCode.FETCH_TIMEOUT;\n }\n throw ERROR_FACTORY.create(errorCode, {\n originalErrorMessage: (originalError as Error)?.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 as Error)?.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 LLC\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 { ErrorCode, ERROR_FACTORY } from '../errors';\nimport { FirebaseError, calculateBackoffMillis } 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\ntype RetriableError = FirebaseError & { customData: { httpStatus: string } };\n/**\n * Returns true if the {@link Error} indicates a fetch request may succeed later.\n */\nfunction isRetriableError(e: Error): e is RetriableError {\n if (!(e instanceof FirebaseError) || !e.customData) {\n return false;\n }\n\n // Uses string index defined by ErrorData, which FirebaseError implements.\n const httpStatus = Number(e.customData['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 as Error)) {\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 LLC\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';\nimport {\n RemoteConfig as RemoteConfigType,\n FetchStatus,\n RemoteConfigSettings\n} from './public_types';\nimport { StorageCache } from './storage/storage_cache';\nimport { RemoteConfigFetchClient } from './client/remote_config_fetch_client';\nimport { Storage } from './storage/storage';\nimport { Logger } 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 /**\n * Tracks completion of initialization promise.\n * @internal\n */\n _isInitializationComplete = false;\n\n /**\n * De-duplicates initialization calls.\n * @internal\n */\n _initializePromise?: Promise<void>;\n\n settings: RemoteConfigSettings = {\n fetchTimeoutMillis: DEFAULT_FETCH_TIMEOUT_MILLIS,\n minimumFetchIntervalMillis: DEFAULT_CACHE_MAX_AGE_MILLIS\n };\n\n defaultConfig: { [key: string]: string | number | boolean } = {};\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 /**\n * @internal\n */\n readonly _client: RemoteConfigFetchClient,\n /**\n * @internal\n */\n readonly _storageCache: StorageCache,\n /**\n * @internal\n */\n readonly _storage: Storage,\n /**\n * @internal\n */\n readonly _logger: Logger\n ) {}\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\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 as Error)?.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 try {\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 } catch (error) {\n reject(\n ERROR_FACTORY.create(ErrorCode.STORAGE_OPEN, {\n originalErrorMessage: (error as Error)?.message\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 as Error)?.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 as Error)?.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 as Error)?.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 LLC\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 =\n 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 =\n await lastSuccessfulFetchTimestampMillisPromise;\n if (lastSuccessfulFetchTimestampMillis) {\n this.lastSuccessfulFetchTimestampMillis =\n 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 2020 Google LLC\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 _registerComponent,\n registerVersion,\n SDK_VERSION\n} from '@firebase/app';\nimport { isIndexedDBAvailable } from '@firebase/util';\nimport {\n Component,\n ComponentType,\n ComponentContainer,\n InstanceFactoryOptions\n} from '@firebase/component';\nimport { Logger, LogLevel as FirebaseLogLevel } from '@firebase/logger';\nimport { RemoteConfig } from './public_types';\nimport { name as packageName, version } from '../package.json';\nimport { ensureInitialized } from './api';\nimport { CachingClient } from './client/caching_client';\nimport { RestClient } from './client/rest_client';\nimport { RetryingClient } from './client/retrying_client';\nimport { RC_COMPONENT_NAME } from './constants';\nimport { ErrorCode, ERROR_FACTORY } from './errors';\nimport { RemoteConfig as RemoteConfigImpl } from './remote_config';\nimport { Storage } from './storage/storage';\nimport { StorageCache } from './storage/storage_cache';\n// This needs to be in the same file that calls `getProvider()` on the component\n// or it will get tree-shaken out.\nimport '@firebase/installations';\n\nexport function registerRemoteConfig(): void {\n _registerComponent(\n new Component(\n RC_COMPONENT_NAME,\n remoteConfigFactory,\n ComponentType.PUBLIC\n ).setMultipleInstances(true)\n );\n\n registerVersion(packageName, version);\n // BUILD_TARGET will be replaced by values like esm5, esm2017, cjs5, etc during the compilation\n registerVersion(packageName, version, '__BUILD_TARGET__');\n\n function remoteConfigFactory(\n container: ComponentContainer,\n { instanceIdentifier: namespace }: InstanceFactoryOptions\n ): RemoteConfig {\n /* Dependencies */\n // getImmediate for FirebaseApp will always succeed\n const app = container.getProvider('app').getImmediate();\n // The following call will always succeed because rc has `import '@firebase/installations'`\n const installations = container\n .getProvider('installations-internal')\n .getImmediate();\n\n // Guards against the SDK being used in non-browser environments.\n if (typeof window === 'undefined') {\n throw ERROR_FACTORY.create(ErrorCode.REGISTRATION_WINDOW);\n }\n // Guards against the SDK being used when indexedDB is not available.\n if (!isIndexedDBAvailable()) {\n throw ERROR_FACTORY.create(ErrorCode.INDEXED_DB_UNAVAILABLE);\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 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 RemoteConfigImpl(\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 ensureInitialized(remoteConfigInstance);\n\n return remoteConfigInstance;\n }\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\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 { RemoteConfig } from './public_types';\nimport { activate, fetchConfig } from './api';\nimport {\n getModularInstance,\n isIndexedDBAvailable,\n validateIndexedDBOpenable\n} from '@firebase/util';\n\n// This API is put in a separate file, so we can stub fetchConfig and activate in tests.\n// It's not possible to stub standalone functions from the same module.\n/**\n *\n * Performs fetch and activate operations, as a convenience.\n *\n * @param remoteConfig - The {@link RemoteConfig} instance.\n *\n * @returns A `Promise` which resolves to true if the current call activated the fetched configs.\n * If the fetched configs were already activated, the `Promise` will resolve to false.\n *\n * @public\n */\nexport async function fetchAndActivate(\n remoteConfig: RemoteConfig\n): Promise<boolean> {\n remoteConfig = getModularInstance(remoteConfig);\n await fetchConfig(remoteConfig);\n return activate(remoteConfig);\n}\n\n/**\n * This method provides two different checks:\n *\n * 1. Check if IndexedDB exists in the browser environment.\n * 2. Check if the current browser context allows IndexedDB `open()` calls.\n *\n * @returns A `Promise` which resolves to true if a {@link RemoteConfig} instance\n * can be initialized in this environment, or false if it cannot.\n * @public\n */\nexport async function isSupported(): Promise<boolean> {\n if (!isIndexedDBAvailable()) {\n return false;\n }\n\n try {\n const isDBOpenable: boolean = await validateIndexedDBOpenable();\n return isDBOpenable;\n } catch (error) {\n return false;\n }\n}\n","/**\n * Firebase Remote Config\n *\n * @packageDocumentation\n */\n\n/**\n * @license\n * Copyright 2020 Google LLC\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 { registerRemoteConfig } from './register';\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 transient variables on window to avoid lingering state causing panic.\ndeclare global {\n interface Window {\n FIREBASE_REMOTE_CONFIG_URL_BASE: string;\n }\n}\n\nexport * from './api';\nexport * from './api2';\nexport * from './public_types';\n\n/** register component and version 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