NotificationEvent.notification

self.addEventListener('notificationclick', function(event) {
  console.log('On notification click');

  // Data can be attached to the notification so that you
  // can process it in the notificationclick handler.
  console.log('Notification Tag:', event.notification.tag);
  console.log('Notification Data:', event.notification.data);
  event.notification.close();

  // This looks to see if the current is already open and
  // focuses if it is
  event.waitUntil(clients.matchAll({
    type: "window"
  }).then(function(clientList) {
    for (var i = 0; i < clientList.length; i++) {
      var client = clientList[i];
      if (client.url == '/' && 'focus' in client)
        return client.focus();
    }
    if (clients.openWindow)
      return clients.openWindow('/');
  }));
});