add typescript support in svelte files, .js to .ts

src/hooks.server.ts

@@ -0,0 +1,16 @@
+import { decryptToken } from '$lib/auth';
+
+/** @type {import('@sveltejs/kit').Handle} */
+export async function handle({ event, resolve }) {
+	const jwt = event.cookies.get('session');
+	try {
+		if (jwt) {
+			event.locals.user = decryptToken(jwt);
+			return resolve(event);
+		}
+	} catch (err) {
+		await event.cookies.delete('session');
+		event.locals.user = null;
+	}
+	return resolve(event);
+}