FCM Push notifications arrive twice (Nuxt with firebase) - firebase-cloud-messaging

Question

So I searched here about this problem and I saw many experienced it but still didn't find solution.
FCM Push notifications arrive twice if the browser is in background
Ty for your help.
My nuxt config firebase serviced:
services: {
auth: true, // Just as example. Can be any other service.,
messaging: {
createServiceWorker: true,
fcmPublicVapidKey: "###", // OPTIONAL : Sets vapid key for FCM after initialization
inject: fs.readFileSync("./serviceWorker.js")
}
}
my service worker:
messaging.setBackgroundMessageHandler(function(payload) {
console.log("[firebase-messaging-sw.js] Received background message ");
self.registration.hideNotification();
return null;
});
self.addEventListener("push", function(e) {
data = e.data.json();
const options = {
tag: "notification-1",
body: data.notification.body,
vibrate: [100, 50, 100],
data: {
dateOfArrival: Date.now(),
primaryKey: "1"
}
};
self.registration.showNotification(data.notification.title, options);
});
self.addEventListener(
"notificationclick",
function(event) {
console.log("test", event);
event.notification.close();
const url = "home";
event.waitUntil(
self.clients.matchAll({ type: "window" }).then(windowClients => {
// Check if there is already a window/tab open with the target URL
for (let i = 0; i < windowClients.length; i++) {
const client = windowClients[i];
// If so, just focus it.
if (client.url === url && "focus" in client) {
return client.focus();
}
}
if (self.clients.openWindow) {
console.log("open window");
}
})
);
},
false
);

Answer 1

Add
self.registration.hideNotification();
On top of line
self.registration.showNotification(
This allows your app to hide the default notification in which case you will only have one notification.