ServiceWorkerRegistration: getNotifications() method

The getNotifications() method of the ServiceWorkerRegistration interface returns a list of the notifications in the order that they were created from the current origin via the current service worker registration. Origins can have many active but differently-scoped service worker registrations. Notifications created by one service worker on the same origin will not be available to other active service workers on that same origin.

getNotifications()
getNotifications(options)

navigator.serviceWorker.register("sw.js");

const options = { tag: "user_alerts" };

navigator.serviceWorker.ready.then((registration) => {
  registration.getNotifications(options).then((notifications) => {
    // do something with your notifications
  });
});