new build notification - service worker registration - medium

sw-registration.js

import { addSuccessHandler } from 'ember-service-worker/service-worker-registration';

window.isUpdateAvailable =
  'Promise' in window
    ? new Promise(function(resolve) {
      addSuccessHandler(function(reg) {
        reg.onupdatefound = function() {
          const { installing } = reg;
          installing.onstatechange = function() {
            if (installing.state === 'activated') {
              resolve(navigator.serviceWorker.controller !== null);
            }
          };
        };
      });
    })
    : {
      then: function () {
        return false;
      }
    };