astro/packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs

import { defineConfig } from 'astro/config';
import vercel from '@astrojs/vercel/serverless';

export default defineConfig({
	adapter: vercel({
		// Pass some value to make sure it doesn't error out
		includeFiles: ['included.js']
	}),
	output: 'server'
});