sw.js

workbox.routing.registerRoute(
  new RegExp('/assets/'),
  new workbox.strategies.CacheFirst({
    cacheName: 'assets',
    plugins: [
      new workbox.expiration.Plugin({
        maxEntries: 50,
        maxAgeSeconds: 30 * 24 * 60 * 60,
        purgeOnQuotaError: true
      }),
    ],
  })
);