frontend/sw.js

/* AmanPay service worker — offline app shell.
   Network-first for the document/API, cache-first for static assets. */
const CACHE = "amanpay-v1";
const SHELL = ["/", "/manifest.json"];

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 !== CACHE).map((k) => caches.delete(k)))
    ).then(() => self.clients.claim())
  );
});

self.addEventListener("fetch", (e) => {
  const req = e.request;
  if (req.method !== "GET") return;                       // never cache POSTs (payments)
  const url = new URL(req.url);
  // API + biometric calls always go to the network (fresh, never stale).
  if (/^\/(health|wallet|unified|authenticate|enroll|verify|voice|liveness|webauthn|passkey|report-card|users)/.test(url.pathname)) {
    return;                                               // default browser handling
  }
  e.respondWith(
    fetch(req).then((res) => {
      const copy = res.clone();
      caches.open(CACHE).then((c) => c.put(req, copy)).catch(() => {});
      return res;
    }).catch(() => caches.match(req).then((r) => r || caches.match("/")))
  );
});