104 lines
4.0 KiB
TypeScript
104 lines
4.0 KiB
TypeScript
// 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://bit.ly/CRA-PWA
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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}$/)
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)
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type Config = {
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onSuccess?: (registration: ServiceWorkerRegistration) => void
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onUpdate?: (registration: ServiceWorkerRegistration) => void
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}
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export const register = (config?: Config): void => {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href)
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if (publicUrl.origin !== window.location.origin) {
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return
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}
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window.addEventListener('load', () => {
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const swUrl = `${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('This web app is being served cache-first by a service ' + 'worker. To learn more, visit https://bit.ly/CRA-PWA')
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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('New content is available and will be used when all ' + 'tabs for this page are closed. See https://bit.ly/CRA-PWA.')
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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 (response.status === 404 || (contentType != null && contentType.indexOf('javascript') === -1)) {
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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 const 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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