add locals call

src/app.d.ts

@@ -3,7 +3,9 @@
 declare global {
 	namespace App {
 		// interface Error {}
-		// interface Locals {}
+		interface Locals {
+			auth: () => Promise<{ session: Session; user: User } | null>;
+		}
 		// interface PageData {}
 		// interface PageState {}
 		// interface Platform {}

src/hooks.server.ts

@@ -3,5 +3,7 @@ import type { Handle } from '@sveltejs/kit';
 import { svelteKitHandler } from 'better-auth/svelte-kit';
 
 export const handle: Handle = async ({ event, resolve }) => {
+	event.locals.auth = () => auth.api.getSession({ headers: event.request.headers });
+
 	return svelteKitHandler({ event, resolve, auth });
 };