service-worker.js

// service-worker.js
const CACHE_NAME = 'ec-app-v1';
const ASSETS = [
  '/',
  '/index.html',
  '/css/style.css',
  '/js/app.js',
  '/js/ui.js',
  '/js/storage.js',
  '/js/i18n.js',
  '/locales/en.json',
  '/locales/ur.json',
  '/assets/icons.svg'
];

self.addEventListener('install', (e) => {
  e.waitUntil(
    caches.open(CACHE_NAME).then(cache => cache.addAll(ASSETS))
  );
  self.skipWaiting();
});

self.addEventListener('activate', (e) => {
  e.waitUntil(self.clients.claim());
});

self.addEventListener('fetch', (e) => {
  const url = new URL(e.request.url);
  if(ASSETS.includes(url.pathname) || e.request.destination === 'document' || e.request.destination === 'style' || e.request.destination === 'script'){
    e.respondWith(
      caches.match(e.request).then(resp => resp || fetch(e.request).then(fetchResp => {
        return caches.open(CACHE_NAME).then(cache => {
          cache.put(e.request, fetchResp.clone());
          return fetchResp;
        });
      })).catch(() => caches.match('/index.html'))
    );
  } else {
    e.respondWith(fetch(e.request).catch(() => caches.match(e.request)));
  }
});