https://www.christianity.com/sw.js

1// This is the "Offline page" service worker
2importScripts('https://storage.googleapis.com/workbox-cdn/releases/5.1.2/workbox-sw.js');
3
4const CACHE = "pwabuilder-page";
5
6const offlineFallbackPage = "offline.html";
7
8self.addEventListener("message", (event) => {
9    if (event.data && event.data.type === "SKIP_WAITING") {
10        self.skipWaiting();
11    }
12});
13
14self.addEventListener('install', async (event) => {
15    event.waitUntil(
16        caches.open(CACHE)
17            .then((cache) => cache.add(offlineFallbackPage))
18    );
19});
20
21if (workbox.navigationPreload.isSupported()) {
22    workbox.navigationPreload.enable();
23}
24
25self.addEventListener('fetch', (event) => {
26    if (event.request.mode === 'navigate') {
27        event.respondWith((async () => {
28            try {
29                const preloadResp = await event.preloadResponse;
30
31                if (preloadResp) {
32                    return preloadResp;
33                }
34
35                const networkResp = await fetch(event.request);
36                return networkResp;
37            } catch (error) {
38
39                const cache = await caches.open(CACHE);
40                const cachedResp = await cache.match(offlineFallbackPage);
41                return cachedResp;
42            }
43        })());
44    }
45});