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File name : sw.js
Content :
const CACHE_NAME = 'omni-rewards-cache-v1';
const urlsToCache = [
  '/',
  '/index.php',
  'https://cdn.tailwindcss.com',
  'https://unpkg.com/html5-qrcode',
  'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css',
  'https://cdn.jsdelivr.net/npm/canvas-confetti@1.9.3/dist/confetti.browser.min.js',
  'https://cdn.jsdelivr.net/npm/chart.js@4.4.2/dist/chart.umd.min.js'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => {
        console.log('Opened cache');
        return cache.addAll(urlsToCache);
      })
  );
});

self.addEventListener('fetch', event => {
  // We only want to cache GET requests.
  if (event.request.method !== 'GET') {
    return;
  }

  event.respondWith(
    caches.match(event.request)
      .then(response => {
        // Cache hit - return response
        if (response) {
          return response;
        }

        // Clone the request because it's a one-time use stream.
        const fetchRequest = event.request.clone();

        return fetch(fetchRequest).then(
          response => {
            // Check if we received a valid response
            if (!response || response.status !== 200) { // Allow caching of opaque responses from CDNs
              return response;
            }

            // Clone the response because it's also a one-time use stream.
            const responseToCache = response.clone();

            caches.open(CACHE_NAME)
              .then(cache => {
                cache.put(event.request, responseToCache);
              });

            return response;
          }
        );
      })
    );
});

self.addEventListener('activate', event => {
  const cacheWhitelist = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then(cacheNames => {
      return Promise.all(
        cacheNames.map(cacheName => {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});