How can I initiate a PWA (progressive webapp) open from a click on a push notification?

Question

Following this example, I see how PWA can open urls but how can I use push notification to launch the app itself? Not in the browser but the full screen version PWA.

Answer 1

Taken from Jake Archibald's emojoy demo:

self.addEventListener('notificationclick', event => {
    const rootUrl = new URL('/', location).href;
    event.notification.close();
    // Enumerate windows, and call window.focus(), or open a new one.
    event.waitUntil(
      clients.matchAll().then(matchedClients => {
        for (let client of matchedClients) {
          if (client.url === rootUrl) {
            return client.focus();
          }
        }
        return clients.openWindow("/");
      })
    );
});