self.addEventListener("notificationclick", (event) => {
  event.notification.close();
  event.waitUntil(
    self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((clients) => {
      for (const client of clients) {
        if ("focus" in client) return client.focus();
      }
      if (self.clients.openWindow) return self.clients.openWindow("/");
      return undefined;
    }),
  );
});