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feat: add SW stub (#368)
1 parent cd28922 commit 0a6c543

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3 files changed

+19
-270
lines changed

3 files changed

+19
-270
lines changed

‎web/public/service-worker.js

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// Self-destructible service worker stub to self-destruct old broken v1 SW
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self.addEventListener('install', function(e) {
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self.skipWaiting();
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})
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self.addEventListener('activate', function(e) {
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self.registration.unregister()
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.then(function () {
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return self.clients.matchAll();
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})
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.then(function (clients) {
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clients.forEach(client => {
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if (client instanceof WindowClient) {
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client.navigate(client.url)
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}
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})
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});
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})

‎web/src/service-worker.ts

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This file was deleted.

‎web/src/serviceWorkerRegistration.ts

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/// <reference types="node" />
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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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import { trimSuffix } from './utils/path'
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const BASE_URL = trimSuffix(import.meta.env.BASE_URL, '/')
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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}$/),
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)
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interface Config {
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onSuccess?: (registration: ServiceWorkerRegistration) => void
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onUpdate?: (registration: ServiceWorkerRegistration) => void
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}
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export function register(config?: Config) {
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if (import.meta.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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// The URL constructor is available in all browsers that support SW.
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const publicUrl = new URL(BASE_URL, window.location.href)
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if (publicUrl.origin !== window.location.origin) {
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// Our service worker won't work if BASE_URL is on a different origin
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// from what our page is served on. This might happen if a CDN is used to
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// serve assets; see https://github.com/facebook/create-react-app/issues/2374
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return
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}
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window.addEventListener('load', () => {
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const swUrl = `${BASE_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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// eslint-disable-next-line @typescript-eslint/no-floating-promises
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navigator.serviceWorker.ready.then((reg) => {
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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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reg.update().catch((err) => {
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console.error('Failed to update service worker: ', err)
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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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/**
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* Manually registers service worker
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*
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* @param config
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*/
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export function manualRegister(config?: Config) {
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if (import.meta.env.DEV) {
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return
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}
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if (!('serviceWorker' in navigator)) {
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return
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}
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const publicUrl = new URL(BASE_URL, window.location.href)
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if (publicUrl.origin !== window.location.origin) {
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return
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}
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const swUrl = `${BASE_URL}/service-worker.js`
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if (isLocalhost) {
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checkValidServiceWorker(swUrl, config)
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return
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}
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registerValidSW(swUrl, config)
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}
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function registerValidSW(swUrl: string, config?: 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?.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?.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: string, config?: 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 (response.status === 404 || (contentType != null && !contentType.includes('javascript'))) {
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// No service worker found. Probably a different app. Reload the page.
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// eslint-disable-next-line @typescript-eslint/no-floating-promises
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navigator.serviceWorker.ready.then((registration) => {
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// eslint-disable-next-line @typescript-eslint/no-floating-promises
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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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