Clients: openWindow() method

openWindow(url)

// Send notification to OS if applicable
if (self.Notification.permission === "granted") {
  const notificationObject = {
    body: "Click here to view your messages.",
    data: { url: `${self.location.origin}/some/path` },
    // data: { url: 'http://example.com' },
  };
  self.registration.showNotification(
    "You've got messages!",
    notificationObject,
  );
}

// Notification click event listener
self.addEventListener("notificationclick", (e) => {
  // Close the notification popout
  e.notification.close();
  // Get all the Window clients
  e.waitUntil(
    clients.matchAll({ type: "window" }).then((clientsArr) => {
      const windowToFocus = clientsArr.find(
        (windowClient) => windowClient.url === e.notification.data.url,
      );
      if (windowToFocus) {
        // If a Window tab matching the targeted URL already exists, focus that;
        windowToFocus.focus();
      } else {
        // Otherwise, open a new tab to the applicable URL and focus it.
        clients
          .openWindow(e.notification.data.url)
          .then((windowClient) => (windowClient ? windowClient.focus() : null));
      }
    }),
  );
});