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

src/routes/anmeldung/+page.server.ts

@@ -0,0 +1,31 @@
+import { dev } from '$app/environment';
+import { fail, redirect } from '@sveltejs/kit';
+import { authenticate } from '$lib/auth';
+
+const COOKIE_NAME = 'session';
+
+/** @type {import('./$types').Actions} */
+export const actions = {
+	login: async ({ request, cookies }) => {
+		const data = await request.formData();
+		const user = data.get('user');
+		const password = data.get('password');
+
+		const token = authenticate(user, password);
+
+		if (!token) return fail(400, { user, incorrect: true });
+
+		cookies.set(COOKIE_NAME, token, {
+			path: '/',
+			httpOnly: true,
+			sameSite: 'strict',
+			secure: !dev
+		});
+		throw redirect(303, '/');
+	},
+	logout: async (event) => {
+		event.cookies.delete(COOKIE_NAME, {path: '/'});
+		event.locals.user = null;
+		return { success: true };
+	}
+};