POC: Mobile notification via periodicSync

public/sw.js

@@ -19,4 +19,18 @@ self.addEventListener("notificationclick", (e) => {
           .then((windowClient) => (windowClient ? windowClient.focus() : null));
     }),
   );
-});
+});
+
+async function checkNewMessages() {
+  const cachedCredentials = await caches.open('cachedCredentials');
+  // Todo...
+}
+
+self.addEventListener('periodicsync', (event) => {
+  if (event.tag === 'check-new-messages') {
+    // Test if periodicSync notification triggers in Mobile app(created via add to homescreen)
+    self.registration.showNotification("Notification via periodicSync");
+
+    event.waitUntil(checkNewMessages());
+  }
+});