Box - لیست خرید PWA

// Service Worker for Offline Functionality
self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      return response || fetch(event.request).then((fetchResponse) => {
        return caches.open('pwa-cache').then((cache) => {
          cache.put(event.request, fetchResponse.clone());
          return fetchResponse;
        });
      });
    }).catch(() => {
      return caches.match('/offline.html');
    })
  );
});