the-biergarten-app/web/frontend/app/routes/logout.tsx

import { redirect } from 'react-router';
import { destroySession, getSession } from '../lib/auth.server';
import type { Route } from './+types/logout';

export async function loader({ request }: Route.LoaderArgs) {
   const session = await getSession(request);
   return redirect('/', {
      headers: { 'Set-Cookie': await destroySession(session) },
   });
}