NotificationEvent: свойство notification

self.addEventListener("notificationclick", (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((clientList) => {
        for (const client of clientList) {
          if (client.url === "/" && "focus" in client) return client.focus();
        }
        if (clients.openWindow) return clients.openWindow("/");
      }),
  );
});