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const isLocalhost = Boolean( |
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window.location.hostname === 'localhost' || |
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window.location.hostname === '[::1]' || |
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window.location.hostname.match(/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/) |
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) |
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type Config = { |
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onSuccess?: (registration: ServiceWorkerRegistration) => void, |
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onUpdate?: (registration: ServiceWorkerRegistration) => void |
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} |
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export function register(config?: Config): void { |
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { |
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href) |
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if (publicUrl.origin !== window.location.origin) { |
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return |
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} |
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window.addEventListener('load', () => { |
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js` |
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if (isLocalhost) { |
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checkValidServiceWorker(swUrl, config) |
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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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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: 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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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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if (config && config.onUpdate) { |
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config.onUpdate(registration) |
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} |
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} else { |
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console.log('Content is cached for offline use.') |
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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: string, config?: Config) { |
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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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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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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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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(): void { |
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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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