serviceWorker.js

import { precacheAndRoute } from 'workbox-precaching';
import { registerRoute } from 'workbox-routing';
import { CacheFirst } from 'workbox-strategies';

// Used for filtering matches based on status code, header, or both
import { CacheableResponsePlugin } from 'workbox-cacheable-response';
// Used to limit entries in cache, remove entries after a certain period of time
import { ExpirationPlugin } from 'workbox-expiration';

precacheAndRoute(self.__WB_MANIFEST, {
  ignoreURLParametersMatching: [/.*/]
})

// Cache images with a Cache First strategy
registerRoute(
  // Check to see if the request's destination is style for an image
  ({ request }) => request.destination === 'image',
  // Use a Cache First caching strategy
  new CacheFirst({
    // Put all cached files in a cache named 'images'
    cacheName: 'images',
    plugins: [
      // Ensure that only requests that result in a 200 status are cached
      new CacheableResponsePlugin({
        statuses: [200],
      }),
      // Don't cache more than 50 items, and expire them after 30 days
      new ExpirationPlugin({
        maxEntries: 50,
        maxAgeSeconds: 60 * 60 * 24 * 30, // 30 Days
      }),
    ],
  }),
);