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{"version":3,"file":"workbox-expiration.prod.js","sources":["../node_modules/idb/build/wrap-idb-value.js","../node_modules/idb/build/index.js","../_version.js","../models/CacheTimestampsModel.js","../CacheExpiration.js","../ExpirationPlugin.js"],"sourcesContent":["const instanceOfAny = (object, constructors) => constructors.some((c) => object instanceof c);\n\nlet idbProxyableTypes;\nlet cursorAdvanceMethods;\n// This is a function to prevent it throwing up in node environments.\nfunction getIdbProxyableTypes() {\n return (idbProxyableTypes ||\n (idbProxyableTypes = [\n IDBDatabase,\n IDBObjectStore,\n IDBIndex,\n IDBCursor,\n IDBTransaction,\n ]));\n}\n// This is a function to prevent it throwing up in node environments.\nfunction getCursorAdvanceMethods() {\n return (cursorAdvanceMethods ||\n (cursorAdvanceMethods = [\n IDBCursor.prototype.advance,\n IDBCursor.prototype.continue,\n IDBCursor.prototype.continuePrimaryKey,\n ]));\n}\nconst cursorRequestMap = new WeakMap();\nconst transactionDoneMap = new WeakMap();\nconst transactionStoreNamesMap = new WeakMap();\nconst transformCache = new WeakMap();\nconst reverseTransformCache = new WeakMap();\nfunction promisifyRequest(request) {\n const promise = new Promise((resolve, reject) => {\n const unlisten = () => {\n request.removeEventListener('success', success);\n request.removeEventListener('error', error);\n };\n const success = () => {\n resolve(wrap(request.result));\n unlisten();\n };\n const error = () => {\n reject(request.error);\n unlisten();\n };\n request.addEventListener('success', success);\n request.addEventListener('error', error);\n });\n promise\n .then((value) => {\n // Since cursoring reuses the IDBRequest (*sigh*), we cache it for later retrieval\n // (see wrapFunction).\n if (value instanceof IDBCursor) {\n cursorRequestMap.set(value, request);\n }\n // Catching to avoid \"Uncaught Promise exceptions\"\n })\n .catch(() => { });\n // This mapping exists in reverseTransformCache but doesn't doesn't exist in transformCache. This\n // is because we create many promises from a single IDBRequest.\n reverseTransformCache.set(promise, request);\n return promise;\n}\nfunction cacheDonePromiseForTransaction(tx) {\n // Early bail if we've already created a done promise for this transaction.\n if (transactionDoneMap.has(tx))\n return;\n const done = new Promise((resolve, reject) => {\n const unlisten = () => {\n tx.removeEventListener('complete', complete);\n tx.removeEventListener('error', error);\n tx.removeEventListener('abort', error);\n };\n const complete = () => {\n resolve();\n unlisten();\n };\n const error = () => {\n reject(tx.error || new DOMException('AbortError', 'AbortError'));\n unlisten();\n };\n tx.addEventListener('complete', complete);\n tx.addEventListener('error', error);\n tx.addEventListener('abort', error);\n });\n // Cache it for later retrieval.\n transactionDoneMap.set(tx, done);\n}\nlet idbProxyTraps = {\n get(target, prop, receiver) {\n if (target instanceof IDBTransaction) {\n // Special handling for transaction.done.\n if (prop === 'done')\n return transactionDoneMap.get(target);\n // Polyfill for objectStoreNames because of Edge.\n if (prop === 'objectStoreNames') {\n return target.objectStoreNames || transactionStoreNamesMap.get(target);\n }\n // Make tx.store return the only store in the transaction, or undefined if there are many.\n if (prop === 'store') {\n return receiver.objectStoreNames[1]\n ? undefined\n : receiver.objectStore(receiver.objectStoreNames[0]);\n }\n }\n // Else transform whatever we get back.\n return wrap(target[prop]);\n },\n set(target, prop, value) {\n target[prop] = value;\n return true;\n },\n has(target, prop) {\n if (target instanceof IDBTransaction &&\n (prop === 'done' || prop === 'store')) {\n return true;\n }\n return prop in target;\n },\n};\nfunction replaceTraps(callback) {\n idbProxyTraps = callback(idbProxyTraps);\n}\nfunction wrapFunction(func) {\n // Due to expected object equality (which is enforced by the caching in `wrap`), we\n // only create one new func per func.\n // Edge doesn't support objectStoreNames (booo), so we polyfill it here.\n if (func === IDBDatabase.prototype.transaction &&\n !('objectStoreNames' in IDBTransaction.prototype)) {\n return function (storeNames, ...args) {\n const tx = func.call(unwrap(this), storeNames, ...args);\n transactionStoreNamesMap.set(tx, storeNames.sort ? storeNames.sort() : [storeNames]);\n return wrap(tx);\n };\n }\n // Cursor methods are special, as the behaviour is a little more different to standard IDB. In\n // IDB, you advance the cursor and wait for a new 'success' on the IDBRequest that gave you the\n // cursor. It's kinda like a promise that can resolve with many values. That doesn't make sense\n // with real promises, so each advance methods returns a new promise for the cursor object, or\n // undefined if the end of the cursor has been reached.\n if (getCursorAdvanceMethods().includes(func)) {\n return function (...args) {\n // Calling the original function with the proxy as 'this' causes ILLEGAL INVOCATION, so we use\n // the original object.\n func.apply(unwrap(this), args);\n return wrap(cursorRequestMap.get(this));\n };\n }\n return function (...args) {\n // Calling the original function with the proxy as 'this' causes ILLEGAL INVOCATION, so we use\n // the original object.\n return wrap(func.apply(unwrap(this), args));\n };\n}\nfunction transformCachableValue(value) {\n if (typeof value === 'function')\n return wrapFunction(value);\n // This doesn't return, it just creates a 'done' promise for the transaction,\n // which is later returned for transaction.done (see idbObjectHandler).\n if (value instanceof IDBTransaction)\n cacheDonePromiseForTransaction(value);\n if (instanceOfAny(value, getIdbProxyableTypes()))\n return new Proxy(value, idbProxyTraps);\n // Return the same value back if we're not going to transform it.\n return value;\n}\nfunction wrap(value) {\n // We sometimes generate multiple promises from a single IDBRequest (eg when cursoring), because\n // IDB is weird and a single IDBRequest can yield many responses, so these can't be cached.\n if (value instanceof IDBRequest)\n return promisifyRequest(value);\n // If we've already transformed this value before, reuse the transformed value.\n // This is faster, but it also provides object equality.\n if (transformCache.has(value))\n return transformCache.get(value);\n const newValue = transformCachableValue(value);\n // Not all types are transformed.\n // These may be primitive types, so they can't be WeakMap keys.\n if (newValue !== value) {\n transformCache.set(value, newValue);\n reverseTransformCache.set(newValue, value);\n }\n return newValue;\n}\nconst unwrap = (value) => reverseTransformCache.get(value);\n\nexport { reverseTransformCache as a, instanceOfAny as i, replaceTraps as r, unwrap as u, wrap as w };\n","import { w as wrap, r as replaceTraps } from './wrap-idb-value.js';\nexport { u as unwrap, w as wrap } from './wrap-idb-value.js';\n\n/**\n * Open a database.\n *\n * @param name Name of the database.\n * @param version Schema version.\n * @param callbacks Additional callbacks.\n */\nfunction openDB(name, version, { blocked, upgrade, blocking, terminated } = {}) {\n const request = indexedDB.open(name, version);\n const openPromise = wrap(request);\n if (upgrade) {\n request.addEventListener('upgradeneeded', (event) => {\n upgrade(wrap(request.result), event.oldVersion, event.newVersion, wrap(request.transaction));\n });\n }\n if (blocked)\n request.addEventListener('blocked', () => blocked());\n openPromise\n .then((db) => {\n if (terminated)\n db.addEventListener('close', () => terminated());\n if (blocking)\n db.addEventListener('versionchange', () => blocking());\n })\n .catch(() => { });\n return openPromise;\n}\n/**\n * Delete a database.\n *\n * @param name Name of the database.\n */\nfunction deleteDB(name, { blocked } = {}) {\n const request = indexedDB.deleteDatabase(name);\n if (blocked)\n request.addEventListener('blocked', () => blocked());\n return wrap(request).then(() => undefined);\n}\n\nconst readMethods = ['get', 'getKey', 'getAll', 'getAllKeys', 'count'];\nconst writeMethods = ['put', 'add', 'delete', 'clear'];\nconst cachedMethods = new Map();\nfunction getMethod(target, prop) {\n if (!(target instanceof IDBDatabase &&\n !(prop in target) &&\n typeof prop === 'string')) {\n return;\n }\n if (cachedMethods.get(prop))\n return cachedMethods.get(prop);\n const targetFuncName = prop.replace(/FromIndex$/, '');\n const useIndex = prop !== targetFuncName;\n const isWrite = writeMethods.includes(targetFuncName);\n if (\n // Bail if the target doesn't exist on the target. Eg, getAll isn't in Edge.\n !(targetFuncName in (useIndex ? IDBIndex : IDBObjectStore).prototype) ||\n !(isWrite || readMethods.includes(targetFuncName))) {\n return;\n }\n const method = async function (storeName, ...args) {\n // isWrite ? 'readwrite' : undefined gzipps better, but fails in Edge :(\n const tx = this.transaction(storeName, isWrite ? 'readwrite' : 'readonly');\n let target = tx.store;\n if (useIndex)\n target = target.index(args.shift());\n // Must reject if op rejects.\n // If it's a write operation, must reject if tx.done rejects.\n // Must reject with op rejection first.\n // Must resolve with op value.\n // Must handle both promises (no unhandled rejections)\n return (await Promise.all([\n target[targetFuncName](...args),\n isWrite && tx.done,\n ]))[0];\n };\n cachedMethods.set(prop, method);\n return method;\n}\nreplaceTraps((oldTraps) => ({\n ...oldTraps,\n get: (target, prop, receiver) => getMethod(target, prop) || oldTraps.get(target, prop, receiver),\n has: (target, prop) => !!getMethod(target, prop) || oldTraps.has(target, prop),\n}));\n\nexport { deleteDB, openDB };\n","\"use strict\";\n// @ts-ignore\ntry {\n self['workbox:expiration:6.5.4'] && _();\n}\ncatch (e) { }\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\nimport { openDB, deleteDB } from 'idb';\nimport '../_version.js';\nconst DB_NAME = 'workbox-expiration';\nconst CACHE_OBJECT_STORE = 'cache-entries';\nconst normalizeURL = (unNormalizedUrl) => {\n const url = new URL(unNormalizedUrl, location.href);\n url.hash = '';\n return url.href;\n};\n/**\n * Returns the timestamp model.\n *\n * @private\n */\nclass CacheTimestampsModel {\n /**\n *\n * @param {string} cacheName\n *\n * @private\n */\n constructor(cacheName) {\n this._db = null;\n this._cacheName = cacheName;\n }\n /**\n * Performs an upgrade of indexedDB.\n *\n * @param {IDBPDatabase<CacheDbSchema>} db\n *\n * @private\n */\n _upgradeDb(db) {\n // TODO(philipwalton): EdgeHTML doesn't support arrays as a keyPath, so we\n // have to use the `id` keyPath here and create our own values (a\n // concatenation of `url + cacheName`) instead of simply using\n // `keyPath: ['url', 'cacheName']`, which is supported in other browsers.\n const objStore = db.createObjectStore(CACHE_OBJECT_STORE, { keyPath: 'id' });\n // TODO(philipwalton): once we don't have to support EdgeHTML, we can\n // create a single index with the keyPath `['cacheName', 'timestamp']`\n // instead of doing both these indexes.\n objStore.createIndex('cacheName', 'cacheName', { unique: false });\n objStore.createIndex('timestamp', 'timestamp', { unique: false });\n }\n /**\n * Performs an upgrade of indexedDB and deletes deprecated DBs.\n *\n * @param {IDBPDatabase<CacheDbSchema>} db\n *\n * @private\n */\n _upgradeDbAndDeleteOldDbs(db) {\n this._upgradeDb(db);\n if (this._cacheName) {\n void deleteDB(this._cacheName);\n }\n }\n /**\n * @param {string} url\n * @param {number} timestamp\n *\n * @private\n */\n async setTimestamp(url, timestamp) {\n url = normalizeURL(url);\n const entry = {\n url,\n timestamp,\n cacheName: this._cacheName,\n // Creating an ID from the URL and cache name won't be necessary once\n // Edge switches to Chromium and all browsers we support work with\n // array keyPaths.\n id: this._getId(url),\n };\n const db = await this.getDb();\n const tx = db.transaction(CACHE_OBJECT_STORE, 'readwrite', {\n durability: 'relaxed',\n });\n await tx.store.put(entry);\n await tx.done;\n }\n /**\n * Returns the timestamp stored for a given URL.\n *\n * @param {string} url\n * @return {number | undefined}\n *\n * @private\n */\n async getTimestamp(url) {\n const db = await this.getDb();\n const entry = await db.get(CACHE_OBJECT_STORE, this._getId(url));\n return entry === null || entry === void 0 ? void 0 : entry.timestamp;\n }\n /**\n * Iterates through all the entries in the object store (from newest to\n * oldest) and removes entries once either `maxCount` is reached or the\n * entry's timestamp is less than `minTimestamp`.\n *\n * @param {number} minTimestamp\n * @param {number} maxCount\n * @return {Array<string>}\n *\n * @private\n */\n async expireEntries(minTimestamp, maxCount) {\n const db = await this.getDb();\n let cursor = await db\n .transaction(CACHE_OBJECT_STORE)\n .store.index('timestamp')\n .openCursor(null, 'prev');\n const entriesToDelete = [];\n let entriesNotDeletedCount = 0;\n while (cursor) {\n const result = cursor.value;\n // TODO(philipwalton): once we can use a multi-key index, we\n // won't have to check `cacheName` here.\n if (result.cacheName === this._cacheName) {\n // Delete an entry if it's older than the max age or\n // if we already have the max number allowed.\n if ((minTimestamp && result.timestamp < minTimestamp) ||\n (maxCount && entriesNotDeletedCount >= maxCount)) {\n // TODO(philipwalton): we should be able to delete the\n // entry right here, but doing so causes an iteration\n // bug in Safari stable (fixed in TP). Instead we can\n // store the keys of the entries to delete, and then\n // delete the separate transactions.\n // https://github.com/GoogleChrome/workbox/issues/1978\n // cursor.delete();\n // We only need to return the URL, not the whole entry.\n entriesToDelete.push(cursor.value);\n }\n else {\n entriesNotDeletedCount++;\n }\n }\n cursor = await cursor.continue();\n }\n // TODO(philipwalton): once the Safari bug in the following issue is fixed,\n // we should be able to remove this loop and do the entry deletion in the\n // cursor loop above:\n // https://github.com/GoogleChrome/workbox/issues/1978\n const urlsDeleted = [];\n for (const entry of entriesToDelete) {\n await db.delete(CACHE_OBJECT_STORE, entry.id);\n urlsDeleted.push(entry.url);\n }\n return urlsDeleted;\n }\n /**\n * Takes a URL and returns an ID that will be unique in the object store.\n *\n * @param {string} url\n * @return {string}\n *\n * @private\n */\n _getId(url) {\n // Creating an ID from the URL and cache name won't be necessary once\n // Edge switches to Chromium and all browsers we support work with\n // array keyPaths.\n return this._cacheName + '|' + normalizeURL(url);\n }\n /**\n * Returns an open connection to the database.\n *\n * @private\n */\n async getDb() {\n if (!this._db) {\n this._db = await openDB(DB_NAME, 1, {\n upgrade: this._upgradeDbAndDeleteOldDbs.bind(this),\n });\n }\n return this._db;\n }\n}\nexport { CacheTimestampsModel };\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\nimport { assert } from 'workbox-core/_private/assert.js';\nimport { dontWaitFor } from 'workbox-core/_private/dontWaitFor.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { CacheTimestampsModel } from './models/CacheTimestampsModel.js';\nimport './_version.js';\n/**\n * The `CacheExpiration` class allows you define an expiration and / or\n * limit on the number of responses stored in a\n * [`Cache`](https://developer.mozilla.org/en-US/docs/Web/API/Cache).\n *\n * @memberof workbox-expiration\n */\nclass CacheExpiration {\n /**\n * To construct a new CacheExpiration instance you must provide at least\n * one of the `config` properties.\n *\n * @param {string} cacheName Name of the cache to apply restrictions to.\n * @param {Object} config\n * @param {number} [config.maxEntries] The maximum number of entries to cache.\n * Entries used the least will be removed as the maximum is reached.\n * @param {number} [config.maxAgeSeconds] The maximum age of an entry before\n * it's treated as stale and removed.\n * @param {Object} [config.matchOptions] The [`CacheQueryOptions`](https://developer.mozilla.org/en-US/docs/Web/API/Cache/delete#Parameters)\n * that will be used when calling `delete()` on the cache.\n */\n constructor(cacheName, config = {}) {\n this._isRunning = false;\n this._rerunRequested = false;\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(cacheName, 'string', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'cacheName',\n });\n if (!(config.maxEntries || config.maxAgeSeconds)) {\n throw new WorkboxError('max-entries-or-age-required', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n });\n }\n if (config.maxEntries) {\n assert.isType(config.maxEntries, 'number', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'config.maxEntries',\n });\n }\n if (config.maxAgeSeconds) {\n assert.isType(config.maxAgeSeconds, 'number', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'constructor',\n paramName: 'config.maxAgeSeconds',\n });\n }\n }\n this._maxEntries = config.maxEntries;\n this._maxAgeSeconds = config.maxAgeSeconds;\n this._matchOptions = config.matchOptions;\n this._cacheName = cacheName;\n this._timestampModel = new CacheTimestampsModel(cacheName);\n }\n /**\n * Expires entries for the given cache and given criteria.\n */\n async expireEntries() {\n if (this._isRunning) {\n this._rerunRequested = true;\n return;\n }\n this._isRunning = true;\n const minTimestamp = this._maxAgeSeconds\n ? Date.now() - this._maxAgeSeconds * 1000\n : 0;\n const urlsExpired = await this._timestampModel.expireEntries(minTimestamp, this._maxEntries);\n // Delete URLs from the cache\n const cache = await self.caches.open(this._cacheName);\n for (const url of urlsExpired) {\n await cache.delete(url, this._matchOptions);\n }\n if (process.env.NODE_ENV !== 'production') {\n if (urlsExpired.length > 0) {\n logger.groupCollapsed(`Expired ${urlsExpired.length} ` +\n `${urlsExpired.length === 1 ? 'entry' : 'entries'} and removed ` +\n `${urlsExpired.length === 1 ? 'it' : 'them'} from the ` +\n `'${this._cacheName}' cache.`);\n logger.log(`Expired the following ${urlsExpired.length === 1 ? 'URL' : 'URLs'}:`);\n urlsExpired.forEach((url) => logger.log(` ${url}`));\n logger.groupEnd();\n }\n else {\n logger.debug(`Cache expiration ran and found no entries to remove.`);\n }\n }\n this._isRunning = false;\n if (this._rerunRequested) {\n this._rerunRequested = false;\n dontWaitFor(this.expireEntries());\n }\n }\n /**\n * Update the timestamp for the given URL. This ensures the when\n * removing entries based on maximum entries, most recently used\n * is accurate or when expiring, the timestamp is up-to-date.\n *\n * @param {string} url\n */\n async updateTimestamp(url) {\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(url, 'string', {\n moduleName: 'workbox-expiration',\n className: 'CacheExpiration',\n funcName: 'updateTimestamp',\n paramName: 'url',\n });\n }\n await this._timestampModel.setTimestamp(url, Date.now());\n }\n /**\n * Can be used to check if a URL has expired or not before it's used.\n *\n * This requires a look up from IndexedDB, so can be slow.\n *\n * Note: This method will not remove the cached entry, call\n * `expireEntries()` to remove indexedDB and Cache entries.\n *\n * @param {string} url\n * @return {boolean}\n */\n async isURLExpired(url) {\n if (!this._maxAgeSeconds) {\n if (process.env.NODE_ENV !== 'production') {\n throw new WorkboxError(`expired-test-without-max-age`, {\n methodName: 'isURLExpired',\n paramName: 'maxAgeSeconds',\n });\n }\n return false;\n }\n else {\n const timestamp = await this._timestampModel.getTimestamp(url);\n const expireOlderThan = Date.now() - this._maxAgeSeconds * 1000;\n return timestamp !== undefined ? timestamp < expireOlderThan : true;\n }\n }\n /**\n * Removes the IndexedDB object store used to keep track of cache expiration\n * metadata.\n */\n async delete() {\n // Make sure we don't attempt another rerun if we're called in the middle of\n // a cache expiration.\n this._rerunRequested = false;\n await this._timestampModel.expireEntries(Infinity); // Expires all.\n }\n}\nexport { CacheExpiration };\n","/*\n Copyright 2018 Google LLC\n\n Use of this source code is governed by an MIT-style\n license that can be found in the LICENSE file or at\n https://opensource.org/licenses/MIT.\n*/\nimport { assert } from 'workbox-core/_private/assert.js';\nimport { cacheNames } from 'workbox-core/_private/cacheNames.js';\nimport { dontWaitFor } from 'workbox-core/_private/dontWaitFor.js';\nimport { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { registerQuotaErrorCallback } from 'workbox-core/registerQuotaErrorCallback.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { CacheExpiration } from './CacheExpiration.js';\nimport './_version.js';\n/**\n * This plugin can be used in a `workbox-strategy` to regularly enforce a\n * limit on the age and / or the number of cached requests.\n *\n * It can only be used with `workbox-strategy` instances that have a\n * [custom `cacheName` property set](/web/tools/workbox/guides/configure-workbox#custom_cache_names_in_strategies).\n * In other words, it can't be used to expire entries in strategy that uses the\n * default runtime cache name.\n *\n * Whenever a cached response is used or updated, this plugin will look\n * at the associated cache and remove any old or extra responses.\n *\n * When using `maxAgeSeconds`, responses may be used *once* after expiring\n * because the expiration clean up will not have occurred until *after* the\n * cached response has been used. If the response has a \"Date\" header, then\n * a light weight expiration check is performed and the response will not be\n * used immediately.\n *\n * When using `maxEntries`, the entry least-recently requested will be removed\n * from the cache first.\n *\n * @memberof workbox-expiration\n */\nclass ExpirationPlugin {\n /**\n * @param {ExpirationPluginOptions} config\n * @param {number} [config.maxEntries] The maximum number of entries to cache.\n * Entries used the least will be removed as the maximum is reached.\n * @param {number} [config.maxAgeSeconds] The maximum age of an entry before\n * it's treated as stale and removed.\n * @param {Object} [config.matchOptions] The [`CacheQueryOptions`](https://developer.mozilla.org/en-US/docs/Web/API/Cache/delete#Parameters)\n * that will be used when calling `delete()` on the cache.\n * @param {boolean} [config.purgeOnQuotaError] Whether to opt this cache in to\n * automatic deletion if the available storage quota has been exceeded.\n */\n constructor(config = {}) {\n /**\n * A \"lifecycle\" callback that will be triggered automatically by the\n * `workbox-strategies` handlers when a `Response` is about to be returned\n * from a [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to\n * the handler. It allows the `Response` to be inspected for freshness and\n * prevents it from being used if the `Response`'s `Date` header value is\n * older than the configured `maxAgeSeconds`.\n *\n * @param {Object} options\n * @param {string} options.cacheName Name of the cache the response is in.\n * @param {Response} options.cachedResponse The `Response` object that's been\n * read from a cache and whose freshness should be checked.\n * @return {Response} Either the `cachedResponse`, if it's\n * fresh, or `null` if the `Response` is older than `maxAgeSeconds`.\n *\n * @private\n */\n this.cachedResponseWillBeUsed = async ({ event, request, cacheName, cachedResponse, }) => {\n if (!cachedResponse) {\n return null;\n }\n const isFresh = this._isResponseDateFresh(cachedResponse);\n // Expire entries to ensure that even if the expiration date has\n // expired, it'll only be used once.\n const cacheExpiration = this._getCacheExpiration(cacheName);\n dontWaitFor(cacheExpiration.expireEntries());\n // Update the metadata for the request URL to the current timestamp,\n // but don't `await` it as we don't want to block the response.\n const updateTimestampDone = cacheExpiration.updateTimestamp(request.url);\n if (event) {\n try {\n event.waitUntil(updateTimestampDone);\n }\n catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n // The event may not be a fetch event; only log the URL if it is.\n if ('request' in event) {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache entry for ` +\n `'${getFriendlyURL(event.request.url)}'.`);\n }\n }\n }\n }\n return isFresh ? cachedResponse : null;\n };\n /**\n * A \"lifecycle\" callback that will be triggered automatically by the\n * `workbox-strategies` handlers when an entry is added to a cache.\n *\n * @param {Object} options\n * @param {string} options.cacheName Name of the cache that was updated.\n * @param {string} options.request The Request for the cached entry.\n *\n * @private\n */\n this.cacheDidUpdate = async ({ cacheName, request, }) => {\n if (process.env.NODE_ENV !== 'production') {\n assert.isType(cacheName, 'string', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'cacheDidUpdate',\n paramName: 'cacheName',\n });\n assert.isInstance(request, Request, {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'cacheDidUpdate',\n paramName: 'request',\n });\n }\n const cacheExpiration = this._getCacheExpiration(cacheName);\n await cacheExpiration.updateTimestamp(request.url);\n await cacheExpiration.expireEntries();\n };\n if (process.env.NODE_ENV !== 'production') {\n if (!(config.maxEntries || config.maxAgeSeconds)) {\n throw new WorkboxError('max-entries-or-age-required', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n });\n }\n if (config.maxEntries) {\n assert.isType(config.maxEntries, 'number', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n paramName: 'config.maxEntries',\n });\n }\n if (config.maxAgeSeconds) {\n assert.isType(config.maxAgeSeconds, 'number', {\n moduleName: 'workbox-expiration',\n className: 'Plugin',\n funcName: 'constructor',\n paramName: 'config.maxAgeSeconds',\n });\n }\n }\n this._config = config;\n this._maxAgeSeconds = config.maxAgeSeconds;\n this._cacheExpirations = new Map();\n if (config.purgeOnQuotaError) {\n registerQuotaErrorCallback(() => this.deleteCacheAndMetadata());\n }\n }\n /**\n * A simple helper method to return a CacheExpiration instance for a given\n * cache name.\n *\n * @param {string} cacheName\n * @return {CacheExpiration}\n *\n * @private\n */\n _getCacheExpiration(cacheName) {\n if (cacheName === cacheNames.getRuntimeName()) {\n throw new WorkboxError('expire-custom-caches-only');\n }\n let cacheExpiration = this._cacheExpirations.get(cacheName);\n if (!cacheExpiration) {\n cacheExpiration = new CacheExpiration(cacheName, this._config);\n 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@param {Response} cachedResponse\n * @return {number|null}\n *\n * @private\n */\n _getDateHeaderTimestamp(cachedResponse) {\n if (!cachedResponse.headers.has('date')) {\n return null;\n }\n const dateHeader = cachedResponse.headers.get('date');\n const parsedDate = new Date(dateHeader);\n const headerTime = parsedDate.getTime();\n // If the Date header was invalid for some reason, parsedDate.getTime()\n // will return NaN.\n if (isNaN(headerTime)) {\n return null;\n }\n return headerTime;\n }\n /**\n * This is a helper method that performs two operations:\n *\n * - Deletes *all* the underlying Cache instances associated with this plugin\n * instance, by calling caches.delete() on your behalf.\n * - Deletes the metadata from IndexedDB used to keep track of expiration\n * details for each Cache instance.\n *\n * When using cache expiration, calling this method is preferable to calling\n * `caches.delete()` directly, since this will ensure that the IndexedDB\n * metadata is also cleanly removed and open IndexedDB instances are deleted.\n *\n * Note that if you're *not* using cache expiration for a given cache, calling\n * `caches.delete()` and passing in the cache's name should be sufficient.\n * There is no Workbox-specific method needed for cleanup in that case.\n */\n async deleteCacheAndMetadata() {\n // Do this one at a time instead of all at once via `Promise.all()` to\n // reduce the chance of inconsistency if a promise rejects.\n for (const [cacheName, cacheExpiration] of this._cacheExpirations) {\n await self.caches.delete(cacheName);\n await cacheExpiration.delete();\n }\n // Reset this._cacheExpirations to its initial state.\n this._cacheExpirations = new Map();\n }\n}\nexport { ExpirationPlugin 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