Aded not-show notif when window visible

src/snek/static/service-worker.js

@@ -1,3 +1,11 @@
+function isClientOpen(url) {
+    return self.clients.matchAll().then((clients) => {
+        return clients.some((client) => {
+            return client.url === url && "focus" in client;
+        });
+    });
+}
+
 self.addEventListener("install", (event) => {
     console.log("Service worker installing...");
     event.waitUntil(
@@ -20,6 +28,11 @@ self.addEventListener("push", (event) => {
     const data = event.data?.json() ?? {};
     console.log("Received a push message", event, data);
 
+    if(isClientOpen(data.url || data.link || `/web.html`)){
+        console.log("Client already open, not showing notification.");
+        return;
+    }
+
     const title = data.title || "Something Has Happened";
     const message =
         data.message || "Here's something you might want to check out.";
@@ -41,6 +54,8 @@ self.addEventListener("push", (event) => {
     event.waitUntil(reg);
 });
 
+
+
 self.addEventListener("notificationclick", (event) => {
     console.log("Notification click Received.", event);
     event.notification.close();