logicsrc/apps/commandboard-web/public/service-worker.js

const CACHE_NAME = "commandboard-shell-v1";
const SHELL_ASSETS = ["/", "/manifest.webmanifest", "/icon.svg"];

self.addEventListener("install", (event) => {
  event.waitUntil(caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL_ASSETS)));
  self.skipWaiting();
});

self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches.keys().then((keys) => Promise.all(keys.filter((key) => key !== CACHE_NAME).map((key) => caches.delete(key))))
  );
  self.clients.claim();
});

self.addEventListener("fetch", (event) => {
  if (event.request.method !== "GET") {
    return;
  }

  event.respondWith(
    fetch(event.request)
      .then((response) => {
        if (response.ok && new URL(event.request.url).origin === self.location.origin) {
          const clone = response.clone();
          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
        }
        return response;
      })
      .catch(() => caches.match(event.request).then((cached) => cached || caches.match("/")))
  );
});