test.js

function askPermission() {
    return new Promise(function(resolve, reject) {
      const permissionResult = Notification.requestPermission(function(result) {
        resolve(result);
      });
  
      if (permissionResult) {
        permissionResult.then(resolve, reject);
      }
    })
    .then(function(permissionResult) {
      if (permissionResult !== 'granted') {
        throw new Error('We weren\'t granted permission.');
      }
    });
  }

  askPermission().then(d => {
    navigator.serviceWorker.ready
    .then(function(swreg) {
        console.log("blaxblux");
      swreg.showNotification('Successfully subscribed!', {body:'giorgi'});
    });
  })