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‎src/service-worker.js

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/* eslint-disable no-restricted-globals */
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// This service worker can be customized!
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// See https://developers.google.com/web/tools/workbox/modules
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// for the list of available Workbox modules, or add any other
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// code you'd like.
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// You can also remove this file if you'd prefer not to use a
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// service worker, and the Workbox build step will be skipped.
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import { clientsClaim } from 'workbox-core';
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import { ExpirationPlugin } from 'workbox-expiration';
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import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
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import { registerRoute } from 'workbox-routing';
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import { StaleWhileRevalidate } from 'workbox-strategies';
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clientsClaim();
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// Precache all of the assets generated by your build process.
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// Their URLs are injected into the manifest variable below.
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// This variable must be present somewhere in your service worker file,
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// even if you decide not to use precaching. See https://cra.link/PWA
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precacheAndRoute(self.__WB_MANIFEST);
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// Set up App Shell-style routing, so that all navigation requests
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// are fulfilled with your index.html shell. Learn more at
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// https://developers.google.com/web/fundamentals/architecture/app-shell
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const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
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registerRoute(
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// Return false to exempt requests from being fulfilled by index.html.
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({ request, url }) => {
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// If this isn't a navigation, skip.
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if (request.mode !== 'navigate') {
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return false;
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} // If this is a URL that starts with /_, skip.
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if (url.pathname.startsWith('/_')) {
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return false;
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} // If this looks like a URL for a resource, because it contains // a file extension, skip.
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if (url.pathname.match(fileExtensionRegexp)) {
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return false;
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} // Return true to signal that we want to use the handler.
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return true;
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},
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createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html')
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);
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// An example runtime caching route for requests that aren't handled by the
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// precache, in this case same-origin .png requests like those from in public/
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registerRoute(
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// Add in any other file extensions or routing criteria as needed.
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({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'), // Customize this strategy as needed, e.g., by changing to CacheFirst.
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new StaleWhileRevalidate({
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cacheName: 'images',
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plugins: [
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// Ensure that once this runtime cache reaches a maximum size the
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// least-recently used images are removed.
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new ExpirationPlugin({ maxEntries: 50 }),
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],
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})
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);
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// This allows the web app to trigger skipWaiting via
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// registration.waiting.postMessage({type: 'SKIP_WAITING'})
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self.addEventListener('message', (event) => {
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if (event.data && event.data.type === 'SKIP_WAITING') {
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self.skipWaiting();
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}
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});
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// Any other custom service worker logic can go here.

‎src/serviceWorkerRegistration.js

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// This optional code is used to register a service worker.
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// register() is not called by default.
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// This lets the app load faster on subsequent visits in production, and gives
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// it offline capabilities. However, it also means that developers (and users)
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// will only see deployed updates on subsequent visits to a page, after all the
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// existing tabs open on the page have been closed, since previously cached
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// resources are updated in the background.
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// To learn more about the benefits of this model and instructions on how to
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// opt-in, read https://cra.link/PWA
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const isLocalhost = Boolean(
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window.location.hostname === 'localhost' ||
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// [::1] is the IPv6 localhost address.
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window.location.hostname === '[::1]' ||
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// 127.0.0.0/8 are considered localhost for IPv4.
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window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/)
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);
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export function register(config) {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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// The URL constructor is available in all browsers that support SW.
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
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if (publicUrl.origin !== window.location.origin) {
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// Our service worker won't work if PUBLIC_URL is on a different origin
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// from what our page is served on. This might happen if a CDN is used to
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// serve assets; see https://github.com/facebook/create-react-app/issues/2374
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return;
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}
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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if (isLocalhost) {
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// This is running on localhost. Let's check if a service worker still exists or not.
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checkValidServiceWorker(swUrl, config);
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// Add some additional logging to localhost, pointing developers to the
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// service worker/PWA documentation.
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navigator.serviceWorker.ready.then(() => {
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console.log(
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'This web app is being served cache-first by a service ' +
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'worker. To learn more, visit https://cra.link/PWA'
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);
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});
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} else {
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// Is not localhost. Just register service worker
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registerValidSW(swUrl, config);
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}
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});
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}
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}
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function registerValidSW(swUrl, config) {
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navigator.serviceWorker
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.register(swUrl)
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.then((registration) => {
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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if (installingWorker == null) {
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return;
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}
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the updated precached content has been fetched,
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// but the previous service worker will still serve the older
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// content until all client tabs are closed.
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console.log(
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'New content is available and will be used when all ' +
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'tabs for this page are closed. See https://cra.link/PWA.'
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);
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// Execute callback
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if (config && config.onUpdate) {
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config.onUpdate(registration);
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}
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.');
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// Execute callback
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if (config && config.onSuccess) {
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config.onSuccess(registration);
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}
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}
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}
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};
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};
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})
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.catch((error) => {
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console.error('Error during service worker registration:', error);
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});
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}
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function checkValidServiceWorker(swUrl, config) {
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// Check if the service worker can be found. If it can't reload the page.
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fetch(swUrl, {
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headers: { 'Service-Worker': 'script' },
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})
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.then((response) => {
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// Ensure service worker exists, and that we really are getting a JS file.
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const contentType = response.headers.get('content-type');
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if (
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response.status === 404 ||
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(contentType != null && contentType.indexOf('javascript') === -1)
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) {
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// No service worker found. Probably a different app. Reload the page.
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navigator.serviceWorker.ready.then((registration) => {
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registration.unregister().then(() => {
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window.location.reload();
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});
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});
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} else {
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// Service worker found. Proceed as normal.
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registerValidSW(swUrl, config);
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}
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})
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.catch(() => {
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console.log('No internet connection found. App is running in offline mode.');
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});
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready
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.then((registration) => {
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registration.unregister();
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})
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.catch((error) => {
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console.error(error.message);
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});
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}
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}

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