Source

// Tasks' service worker. It keeps the app shell on the device, so Tasks opens fast and can be
// installed like an app. Boards always load live from the network; nothing here caches board data.
// The build (vite.config.ts) fills in the version and the list of files.
const CACHE = "tasks-shell-__VERSION__";
const SHELL = __SHELL__;

self.addEventListener("install", (e) => {
  e.waitUntil(caches.open(CACHE).then((c) => c.addAll(SHELL)).then(() => self.skipWaiting()));
});

self.addEventListener("activate", (e) => {
  e.waitUntil(
    caches.keys()
      .then((keys) => Promise.all(keys.filter((k) => k.startsWith("tasks-shell-") && k !== CACHE).map((k) => caches.delete(k))))
      .then(() => self.clients.claim()),
  );
});

self.addEventListener("fetch", (e) => {
  const req = e.request;
  const url = new URL(req.url);
  if (req.method !== "GET" || url.origin !== location.origin || url.pathname.startsWith("/__bounded/")) return;
  if (req.mode === "navigate") {
    // Pages: fresh when online; the saved app shell when not.
    e.respondWith(fetch(req).catch(() => caches.match("/", { cacheName: CACHE, ignoreVary: true })));
    return;
  }
  e.respondWith(caches.match(req, { cacheName: CACHE, ignoreVary: true }).then((hit) => hit || fetch(req)));
});