https://hudumacna.com/service-worker.js

1const CACHE_VERSION = "huduma-shell-v2";
2const SAFE_SHELL = [
3  "/offline.html",
4  "/manifest.json",
5  "/logo192.png",
6  "/logo512.png",
7  "/favicon.ico",
8];
9
10self.addEventListener("install", (event) => {
11  event.waitUntil(
12    caches.open(CACHE_VERSION).then((cache) => cache.addAll(SAFE_SHELL)),
13  );
14  self.skipWaiting();
15});
16
17self.addEventListener("activate", (event) => {
18  event.waitUntil(
19    caches
20      .keys()
21      .then((keys) =>
22        Promise.all(
23          keys.filter((key) => key !== CACHE_VERSION).map((key) => caches.delete(key)),
24        ),
25      )
26      .then(() => self.clients.claim()),
27  );
28});
29
30self.addEventListener("fetch", (event) => {
31  const request = event.request;
32  if (request.method !== "GET") return;
33  const url = new URL(request.url);
34  if (url.origin !== self.location.origin) return;
35
36  // Pages and all live Firebase/API data stay network-first. This prevents an
37  // installed device from showing stale exam access, answers, or results.
38  if (request.mode === "navigate") {
39    event.respondWith(
40      fetch(request).catch(() => caches.match("/offline.html")),
41    );
42    return;
43  }
44
45  // Only immutable build assets and public branding are cached locally.
46  if (
47    url.pathname.startsWith("/static/") ||
48    SAFE_SHELL.includes(url.pathname)
49  ) {
50    event.respondWith(
51      caches.match(request).then(
52        (cached) =>
53          cached ||
54          fetch(request).then((response) => {
55            if (response.ok) {
56              const copy = response.clone();
57              caches.open(CACHE_VERSION).then((cache) => cache.put(request, copy));
58            }
59            return response;
60          }),
61      ),
62    );
63  }
64});