| 1 |
- {"version":3,"file":"workbox-strategies.prod.js","sources":["../_version.js","../plugins/cacheOkAndOpaquePlugin.js","../CacheFirst.js","../CacheOnly.js","../NetworkFirst.js","../NetworkOnly.js","../StaleWhileRevalidate.js"],"sourcesContent":["\"use strict\";\n// @ts-ignore\ntry {\n self['workbox:strategies:5.1.4'] && _();\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 '../_version.js';\nexport const cacheOkAndOpaquePlugin = {\n /**\n * Returns a valid response (to allow caching) if the status is 200 (OK) or\n * 0 (opaque).\n *\n * @param {Object} options\n * @param {Response} options.response\n * @return {Response|null}\n *\n * @private\n */\n cacheWillUpdate: async ({ response }) => {\n if (response.status === 200 || response.status === 0) {\n return response;\n }\n return null;\n },\n};\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 { cacheWrapper } from 'workbox-core/_private/cacheWrapper.js';\nimport { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';\nimport { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { messages } from './utils/messages.js';\nimport './_version.js';\n/**\n * An implementation of a [cache-first]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#cache-falling-back-to-network}\n * request strategy.\n *\n * A cache first strategy is useful for assets that have been revisioned,\n * such as URLs like `/styles/example.a8f5f1.css`, since they\n * can be cached for long periods of time.\n *\n * If the network request fails, and there is no cache match, this will throw\n * a `WorkboxError` exception.\n *\n * @memberof module:workbox-strategies\n */\nclass CacheFirst {\n /**\n * @param {Object} options\n * @param {string} options.cacheName Cache name to store and retrieve\n * requests. Defaults to cache names provided by\n * [workbox-core]{@link module:workbox-core.cacheNames}.\n * @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}\n * to use in conjunction with this caching strategy.\n * @param {Object} options.fetchOptions Values passed along to the\n * [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)\n * of all fetch() requests made by this strategy.\n * @param {Object} options.matchOptions [`CacheQueryOptions`](https://w3c.github.io/ServiceWorker/#dictdef-cachequeryoptions)\n */\n constructor(options = {}) {\n this._cacheName = cacheNames.getRuntimeName(options.cacheName);\n this._plugins = options.plugins || [];\n this._fetchOptions = options.fetchOptions;\n this._matchOptions = options.matchOptions;\n }\n /**\n * This method will perform a request strategy and follows an API that\n * will work with the\n * [Workbox Router]{@link module:workbox-routing.Router}.\n *\n * @param {Object} options\n * @param {Request|string} options.request A request to run this strategy for.\n * @param {Event} [options.event] The event that triggered the request.\n * @return {Promise<Response>}\n */\n async handle({ event, request }) {\n const logs = [];\n if (typeof request === 'string') {\n request = new Request(request);\n }\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-strategies',\n className: 'CacheFirst',\n funcName: 'makeRequest',\n paramName: 'request',\n });\n }\n let response = await cacheWrapper.match({\n cacheName: this._cacheName,\n request,\n event,\n matchOptions: this._matchOptions,\n plugins: this._plugins,\n });\n let error;\n if (!response) {\n if (process.env.NODE_ENV !== 'production') {\n logs.push(`No response found in the '${this._cacheName}' cache. ` +\n `Will respond with a network request.`);\n }\n try {\n response = await this._getFromNetwork(request, event);\n }\n catch (err) {\n error = err;\n }\n if (process.env.NODE_ENV !== 'production') {\n if (response) {\n logs.push(`Got response from network.`);\n }\n else {\n logs.push(`Unable to get a response from the network.`);\n }\n }\n }\n else {\n if (process.env.NODE_ENV !== 'production') {\n logs.push(`Found a cached response in the '${this._cacheName}' cache.`);\n }\n }\n if (process.env.NODE_ENV !== 'production') {\n logger.groupCollapsed(messages.strategyStart('CacheFirst', request));\n for (const log of logs) {\n logger.log(log);\n }\n messages.printFinalResponse(response);\n logger.groupEnd();\n }\n if (!response) {\n throw new WorkboxError('no-response', { url: request.url, error });\n }\n return response;\n }\n /**\n * Handles the network and cache part of CacheFirst.\n *\n * @param {Request} request\n * @param {Event} [event]\n * @return {Promise<Response>}\n *\n * @private\n */\n async _getFromNetwork(request, event) {\n const response = await fetchWrapper.fetch({\n request,\n event,\n fetchOptions: this._fetchOptions,\n plugins: this._plugins,\n });\n // Keep the service worker while we put the request to the cache\n const responseClone = response.clone();\n const cachePutPromise = cacheWrapper.put({\n cacheName: this._cacheName,\n request,\n response: responseClone,\n event,\n plugins: this._plugins,\n });\n if (event) {\n try {\n event.waitUntil(cachePutPromise);\n }\n catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache for '${getFriendlyURL(request.url)}'.`);\n }\n }\n }\n return response;\n }\n}\nexport { CacheFirst };\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 { cacheWrapper } from 'workbox-core/_private/cacheWrapper.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { messages } from './utils/messages.js';\nimport './_version.js';\n/**\n * An implementation of a\n * [cache-only]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#cache-only}\n * request strategy.\n *\n * This class is useful if you want to take advantage of any\n * [Workbox plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}.\n *\n * If there is no cache match, this will throw a `WorkboxError` exception.\n *\n * @memberof module:workbox-strategies\n */\nclass CacheOnly {\n /**\n * @param {Object} options\n * @param {string} options.cacheName Cache name to store and retrieve\n * requests. Defaults to cache names provided by\n * [workbox-core]{@link module:workbox-core.cacheNames}.\n * @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}\n * to use in conjunction with this caching strategy.\n * @param {Object} options.matchOptions [`CacheQueryOptions`](https://w3c.github.io/ServiceWorker/#dictdef-cachequeryoptions)\n */\n constructor(options = {}) {\n this._cacheName = cacheNames.getRuntimeName(options.cacheName);\n this._plugins = options.plugins || [];\n this._matchOptions = options.matchOptions;\n }\n /**\n * This method will perform a request strategy and follows an API that\n * will work with the\n * [Workbox Router]{@link module:workbox-routing.Router}.\n *\n * @param {Object} options\n * @param {Request|string} options.request A request to run this strategy for.\n * @param {Event} [options.event] The event that triggered the request.\n * @return {Promise<Response>}\n */\n async handle({ event, request }) {\n if (typeof request === 'string') {\n request = new Request(request);\n }\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-strategies',\n className: 'CacheOnly',\n funcName: 'makeRequest',\n paramName: 'request',\n });\n }\n const response = await cacheWrapper.match({\n cacheName: this._cacheName,\n request,\n event,\n matchOptions: this._matchOptions,\n plugins: this._plugins,\n });\n if (process.env.NODE_ENV !== 'production') {\n logger.groupCollapsed(messages.strategyStart('CacheOnly', request));\n if (response) {\n logger.log(`Found a cached response in the '${this._cacheName}'` +\n ` cache.`);\n messages.printFinalResponse(response);\n }\n else {\n logger.log(`No response found in the '${this._cacheName}' cache.`);\n }\n logger.groupEnd();\n }\n if (!response) {\n throw new WorkboxError('no-response', { url: request.url });\n }\n return response;\n }\n}\nexport { CacheOnly };\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 { cacheWrapper } from 'workbox-core/_private/cacheWrapper.js';\nimport { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';\nimport { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { messages } from './utils/messages.js';\nimport { cacheOkAndOpaquePlugin } from './plugins/cacheOkAndOpaquePlugin.js';\nimport './_version.js';\n/**\n * An implementation of a\n * [network first]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#network-falling-back-to-cache}\n * request strategy.\n *\n * By default, this strategy will cache responses with a 200 status code as\n * well as [opaque responses]{@link https://developers.google.com/web/tools/workbox/guides/handle-third-party-requests}.\n * Opaque responses are are cross-origin requests where the response doesn't\n * support [CORS]{@link https://enable-cors.org/}.\n *\n * If the network request fails, and there is no cache match, this will throw\n * a `WorkboxError` exception.\n *\n * @memberof module:workbox-strategies\n */\nclass NetworkFirst {\n /**\n * @param {Object} options\n * @param {string} options.cacheName Cache name to store and retrieve\n * requests. Defaults to cache names provided by\n * [workbox-core]{@link module:workbox-core.cacheNames}.\n * @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}\n * to use in conjunction with this caching strategy.\n * @param {Object} options.fetchOptions Values passed along to the\n * [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)\n * of all fetch() requests made by this strategy.\n * @param {Object} options.matchOptions [`CacheQueryOptions`](https://w3c.github.io/ServiceWorker/#dictdef-cachequeryoptions)\n * @param {number} options.networkTimeoutSeconds If set, any network requests\n * that fail to respond within the timeout will fallback to the cache.\n *\n * This option can be used to combat\n * \"[lie-fi]{@link https://developers.google.com/web/fundamentals/performance/poor-connectivity/#lie-fi}\"\n * scenarios.\n */\n constructor(options = {}) {\n this._cacheName = cacheNames.getRuntimeName(options.cacheName);\n if (options.plugins) {\n const isUsingCacheWillUpdate = options.plugins.some((plugin) => !!plugin.cacheWillUpdate);\n this._plugins = isUsingCacheWillUpdate ?\n options.plugins : [cacheOkAndOpaquePlugin, ...options.plugins];\n }\n else {\n // No plugins passed in, use the default plugin.\n this._plugins = [cacheOkAndOpaquePlugin];\n }\n this._networkTimeoutSeconds = options.networkTimeoutSeconds || 0;\n if (process.env.NODE_ENV !== 'production') {\n if (this._networkTimeoutSeconds) {\n assert.isType(this._networkTimeoutSeconds, 'number', {\n moduleName: 'workbox-strategies',\n className: 'NetworkFirst',\n funcName: 'constructor',\n paramName: 'networkTimeoutSeconds',\n });\n }\n }\n this._fetchOptions = options.fetchOptions;\n this._matchOptions = options.matchOptions;\n }\n /**\n * This method will perform a request strategy and follows an API that\n * will work with the\n * [Workbox Router]{@link module:workbox-routing.Router}.\n *\n * @param {Object} options\n * @param {Request|string} options.request A request to run this strategy for.\n * @param {Event} [options.event] The event that triggered the request.\n * @return {Promise<Response>}\n */\n async handle({ event, request }) {\n const logs = [];\n if (typeof request === 'string') {\n request = new Request(request);\n }\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-strategies',\n className: 'NetworkFirst',\n funcName: 'handle',\n paramName: 'makeRequest',\n });\n }\n const promises = [];\n let timeoutId;\n if (this._networkTimeoutSeconds) {\n const { id, promise } = this._getTimeoutPromise({ request, event, logs });\n timeoutId = id;\n promises.push(promise);\n }\n const networkPromise = this._getNetworkPromise({ timeoutId, request, event, logs });\n promises.push(networkPromise);\n // Promise.race() will resolve as soon as the first promise resolves.\n let response = await Promise.race(promises);\n // If Promise.race() resolved with null, it might be due to a network\n // timeout + a cache miss. If that were to happen, we'd rather wait until\n // the networkPromise resolves instead of returning null.\n // Note that it's fine to await an already-resolved promise, so we don't\n // have to check to see if it's still \"in flight\".\n if (!response) {\n response = await networkPromise;\n }\n if (process.env.NODE_ENV !== 'production') {\n logger.groupCollapsed(messages.strategyStart('NetworkFirst', request));\n for (const log of logs) {\n logger.log(log);\n }\n messages.printFinalResponse(response);\n logger.groupEnd();\n }\n if (!response) {\n throw new WorkboxError('no-response', { url: request.url });\n }\n return response;\n }\n /**\n * @param {Object} options\n * @param {Request} options.request\n * @param {Array} options.logs A reference to the logs array\n * @param {Event} [options.event]\n * @return {Promise<Response>}\n *\n * @private\n */\n _getTimeoutPromise({ request, logs, event }) {\n let timeoutId;\n const timeoutPromise = new Promise((resolve) => {\n const onNetworkTimeout = async () => {\n if (process.env.NODE_ENV !== 'production') {\n logs.push(`Timing out the network response at ` +\n `${this._networkTimeoutSeconds} seconds.`);\n }\n resolve(await this._respondFromCache({ request, event }));\n };\n timeoutId = setTimeout(onNetworkTimeout, this._networkTimeoutSeconds * 1000);\n });\n return {\n promise: timeoutPromise,\n id: timeoutId,\n };\n }\n /**\n * @param {Object} options\n * @param {number|undefined} options.timeoutId\n * @param {Request} options.request\n * @param {Array} options.logs A reference to the logs Array.\n * @param {Event} [options.event]\n * @return {Promise<Response>}\n *\n * @private\n */\n async _getNetworkPromise({ timeoutId, request, logs, event }) {\n let error;\n let response;\n try {\n response = await fetchWrapper.fetch({\n request,\n event,\n fetchOptions: this._fetchOptions,\n plugins: this._plugins,\n });\n }\n catch (err) {\n error = err;\n }\n if (timeoutId) {\n clearTimeout(timeoutId);\n }\n if (process.env.NODE_ENV !== 'production') {\n if (response) {\n logs.push(`Got response from network.`);\n }\n else {\n logs.push(`Unable to get a response from the network. Will respond ` +\n `with a cached response.`);\n }\n }\n if (error || !response) {\n response = await this._respondFromCache({ request, event });\n if (process.env.NODE_ENV !== 'production') {\n if (response) {\n logs.push(`Found a cached response in the '${this._cacheName}'` +\n ` cache.`);\n }\n else {\n logs.push(`No response found in the '${this._cacheName}' cache.`);\n }\n }\n }\n else {\n // Keep the service worker alive while we put the request in the cache\n const responseClone = response.clone();\n const cachePut = cacheWrapper.put({\n cacheName: this._cacheName,\n request,\n response: responseClone,\n event,\n plugins: this._plugins,\n });\n if (event) {\n try {\n // The event has been responded to so we can keep the SW alive to\n // respond to the request\n event.waitUntil(cachePut);\n }\n catch (err) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache for '${getFriendlyURL(request.url)}'.`);\n }\n }\n }\n }\n return response;\n }\n /**\n * Used if the network timeouts or fails to make the request.\n *\n * @param {Object} options\n * @param {Request} request The request to match in the cache\n * @param {Event} [options.event]\n * @return {Promise<Object>}\n *\n * @private\n */\n _respondFromCache({ event, request }) {\n return cacheWrapper.match({\n cacheName: this._cacheName,\n request,\n event,\n matchOptions: this._matchOptions,\n plugins: this._plugins,\n });\n }\n}\nexport { NetworkFirst };\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 { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { messages } from './utils/messages.js';\nimport './_version.js';\n/**\n * An implementation of a\n * [network-only]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#network-only}\n * request strategy.\n *\n * This class is useful if you want to take advantage of any\n * [Workbox plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}.\n *\n * If the network request fails, this will throw a `WorkboxError` exception.\n *\n * @memberof module:workbox-strategies\n */\nclass NetworkOnly {\n /**\n * @param {Object} options\n * @param {string} options.cacheName Cache name to store and retrieve\n * requests. Defaults to cache names provided by\n * [workbox-core]{@link module:workbox-core.cacheNames}.\n * @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}\n * to use in conjunction with this caching strategy.\n * @param {Object} options.fetchOptions Values passed along to the\n * [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)\n * of all fetch() requests made by this strategy.\n */\n constructor(options = {}) {\n this._plugins = options.plugins || [];\n this._fetchOptions = options.fetchOptions;\n }\n /**\n * This method will perform a request strategy and follows an API that\n * will work with the\n * [Workbox Router]{@link module:workbox-routing.Router}.\n *\n * @param {Object} options\n * @param {Request|string} options.request The request to run this strategy for.\n * @param {Event} [options.event] The event that triggered the request.\n * @return {Promise<Response>}\n */\n async handle({ event, request }) {\n if (typeof request === 'string') {\n request = new Request(request);\n }\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-strategies',\n className: 'NetworkOnly',\n funcName: 'handle',\n paramName: 'request',\n });\n }\n let error;\n let response;\n try {\n response = await fetchWrapper.fetch({\n request,\n event,\n fetchOptions: this._fetchOptions,\n plugins: this._plugins,\n });\n }\n catch (err) {\n error = err;\n }\n if (process.env.NODE_ENV !== 'production') {\n logger.groupCollapsed(messages.strategyStart('NetworkOnly', request));\n if (response) {\n logger.log(`Got response from network.`);\n }\n else {\n logger.log(`Unable to get a response from the network.`);\n }\n messages.printFinalResponse(response);\n logger.groupEnd();\n }\n if (!response) {\n throw new WorkboxError('no-response', { url: request.url, error });\n }\n return response;\n }\n}\nexport { NetworkOnly };\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 { cacheWrapper } from 'workbox-core/_private/cacheWrapper.js';\nimport { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';\nimport { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';\nimport { logger } from 'workbox-core/_private/logger.js';\nimport { WorkboxError } from 'workbox-core/_private/WorkboxError.js';\nimport { messages } from './utils/messages.js';\nimport { cacheOkAndOpaquePlugin } from './plugins/cacheOkAndOpaquePlugin.js';\nimport './_version.js';\n/**\n * An implementation of a\n * [stale-while-revalidate]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#stale-while-revalidate}\n * request strategy.\n *\n * Resources are requested from both the cache and the network in parallel.\n * The strategy will respond with the cached version if available, otherwise\n * wait for the network response. The cache is updated with the network response\n * with each successful request.\n *\n * By default, this strategy will cache responses with a 200 status code as\n * well as [opaque responses]{@link https://developers.google.com/web/tools/workbox/guides/handle-third-party-requests}.\n * Opaque responses are cross-origin requests where the response doesn't\n * support [CORS]{@link https://enable-cors.org/}.\n *\n * If the network request fails, and there is no cache match, this will throw\n * a `WorkboxError` exception.\n *\n * @memberof module:workbox-strategies\n */\nclass StaleWhileRevalidate {\n /**\n * @param {Object} options\n * @param {string} options.cacheName Cache name to store and retrieve\n * requests. Defaults to cache names provided by\n * [workbox-core]{@link module:workbox-core.cacheNames}.\n * @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}\n * to use in conjunction with this caching strategy.\n * @param {Object} options.fetchOptions Values passed along to the\n * [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)\n * of all fetch() requests made by this strategy.\n * @param {Object} options.matchOptions [`CacheQueryOptions`](https://w3c.github.io/ServiceWorker/#dictdef-cachequeryoptions)\n */\n constructor(options = {}) {\n this._cacheName = cacheNames.getRuntimeName(options.cacheName);\n this._plugins = options.plugins || [];\n if (options.plugins) {\n const isUsingCacheWillUpdate = options.plugins.some((plugin) => !!plugin.cacheWillUpdate);\n this._plugins = isUsingCacheWillUpdate ?\n options.plugins : [cacheOkAndOpaquePlugin, ...options.plugins];\n }\n else {\n // No plugins passed in, use the default plugin.\n this._plugins = [cacheOkAndOpaquePlugin];\n }\n this._fetchOptions = options.fetchOptions;\n this._matchOptions = options.matchOptions;\n }\n /**\n * This method will perform a request strategy and follows an API that\n * will work with the\n * [Workbox Router]{@link module:workbox-routing.Router}.\n *\n * @param {Object} options\n * @param {Request|string} options.request A request to run this strategy for.\n * @param {Event} [options.event] The event that triggered the request.\n * @return {Promise<Response>}\n */\n async handle({ event, request }) {\n const logs = [];\n if (typeof request === 'string') {\n request = new Request(request);\n }\n if (process.env.NODE_ENV !== 'production') {\n assert.isInstance(request, Request, {\n moduleName: 'workbox-strategies',\n className: 'StaleWhileRevalidate',\n funcName: 'handle',\n paramName: 'request',\n });\n }\n const fetchAndCachePromise = this._getFromNetwork({ request, event });\n let response = await cacheWrapper.match({\n cacheName: this._cacheName,\n request,\n event,\n matchOptions: this._matchOptions,\n plugins: this._plugins,\n });\n let error;\n if (response) {\n if (process.env.NODE_ENV !== 'production') {\n logs.push(`Found a cached response in the '${this._cacheName}'` +\n ` cache. Will update with the network response in the background.`);\n }\n if (event) {\n try {\n event.waitUntil(fetchAndCachePromise);\n }\n catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache for '${getFriendlyURL(request.url)}'.`);\n }\n }\n }\n }\n else {\n if (process.env.NODE_ENV !== 'production') {\n logs.push(`No response found in the '${this._cacheName}' cache. ` +\n `Will wait for the network response.`);\n }\n try {\n response = await fetchAndCachePromise;\n }\n catch (err) {\n error = err;\n }\n }\n if (process.env.NODE_ENV !== 'production') {\n logger.groupCollapsed(messages.strategyStart('StaleWhileRevalidate', request));\n for (const log of logs) {\n logger.log(log);\n }\n messages.printFinalResponse(response);\n logger.groupEnd();\n }\n if (!response) {\n throw new WorkboxError('no-response', { url: request.url, error });\n }\n return response;\n }\n /**\n * @param {Object} options\n * @param {Request} options.request\n * @param {Event} [options.event]\n * @return {Promise<Response>}\n *\n * @private\n */\n async _getFromNetwork({ request, event }) {\n const response = await fetchWrapper.fetch({\n request,\n event,\n fetchOptions: this._fetchOptions,\n plugins: this._plugins,\n });\n const cachePutPromise = cacheWrapper.put({\n cacheName: this._cacheName,\n request,\n response: response.clone(),\n event,\n plugins: this._plugins,\n });\n if (event) {\n try {\n event.waitUntil(cachePutPromise);\n }\n catch (error) {\n if (process.env.NODE_ENV !== 'production') {\n logger.warn(`Unable to ensure service worker stays alive when ` +\n `updating cache for '${getFriendlyURL(request.url)}'.`);\n }\n }\n }\n return response;\n }\n}\nexport { StaleWhileRevalidate 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