Workbox 4: workbox-window. Service worker with update

app.js

import { Workbox } from 'workbox-window';

if ('serviceWorker' in navigator) {
  const wb = new Workbox('service-worker.js');
 
  wb.addEventListener('installed', event => {
    if (event.isUpdate) {
      if (confirm(`New content is available!. Click OK to refresh`)) {
        window.location.reload();
      }
    }
  });

  wb.register();
}