delete: new workbox.expiration.Plugin() and use new ExpirationPlugin(config) line 30 https://github.com/google-developer-training/pwa-training-labs/blob/master/sw-precache-workbox-lab/solution/app/sw.js https://developers.google.com/web/tools/workbox/reference-docs/latest/module-workbox-expiration.ExpirationPlugin best regards Tjark