static/sw.js

const CACHE_NAME = 'engine-sound-classifier-v1';
const ASSETS_TO_CACHE = [
  '/',
  '/index.html',
  '/static/manifest.json',
  '/static/icons/icon-192x192.png',
  '/static/icons/icon-512x512.png',
  'https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap'
];

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

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