#1 adjust return type

view/src/routes/+layout.svelte

@@ -7,7 +7,7 @@
 	var user: User | null = null;
 	var unsub: (() => void) | null = null;
 
-	onMount(async (): Promise<any> => {
+	onMount(async () => {
 		const { auth: _auth } = await import('../lib/firebase');
 		auth = _auth;
 		user = auth.currentUser;