54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
// This is the service worker with the combined offline experience (Offline page + Offline copy of pages)
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const CACHE = 'pwabuilder-offline-page'
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importScripts('https://storage.googleapis.com/workbox-cdn/releases/5.1.4/workbox-sw.js')
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// TODO: replace the following with the correct offline fallback page i.e.: const offlineFallbackPage = "offline.html";
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const offlineFallbackPage = '/offline.html'
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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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self.addEventListener('install', async (event) => {
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event.waitUntil(
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caches.open(CACHE)
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.then((cache) => cache.add(offlineFallbackPage))
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)
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})
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if (workbox.navigationPreload.isSupported()) {
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workbox.navigationPreload.enable()
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}
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workbox.routing.registerRoute(
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/\/*/,
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new workbox.strategies.StaleWhileRevalidate({
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cacheName: CACHE
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})
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)
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self.addEventListener('fetch', (event) => {
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if (event.request.mode === 'navigate') {
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event.respondWith((async () => {
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try {
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const preloadResp = await event.preloadResponse
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if (preloadResp) {
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return preloadResp
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}
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const networkResp = await fetch(event.request)
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return networkResp
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} catch (error) {
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const cache = await caches.open(CACHE)
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const cachedResp = await cache.match(offlineFallbackPage)
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return cachedResp
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}
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})())
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}
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})
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