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serviceWorker-clicktoreload.js

// Polymer Starter Kit App
// my-app, in `ready` callback

  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('/service-worker.js')
    .then((registration) => {
      registration.onupdatefound = (event) => {
        let installingWorker = registration.installing;

        installingWorker.onstatechange = (event) => {
          switch (installingWorker.state) {
            case 'redundant':
              this._log.error('The installing service-worker was redundant');
              break;
            case 'installed':
              this._log.debug(`Service worker ${installingWorker.state}`);
              return this.$.swtoast.open();
          }
        };
      };
    });
  }