sw.js

const CACHE_NAME = 'swiss-army-tools-v1';
const urlsToCache = [
  '/',
  '/index.html',
  'https://cdn.tailwindcss.com',
  'https://unpkg.com/feather-icons',
  'https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js',
  'https://cdn.jsdelivr.net/npm/[email protected]/qrcode.min.js'
];

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

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request)
      .then(response => {
        if (response) {
          return response;
        }
        return fetch(event.request);
      }
    )
  );
});