commerce/app/robots.ts

const baseUrl = process.env.NEXT_PUBLIC_VERCEL_URL
  ? `https://${process.env.NEXT_PUBLIC_VERCEL_URL}`
  : 'http://localhost:3000';

export default function robots() {
  return {
    rules: [
      {
        userAgent: '*'
      }
    ],
    sitemap: `${baseUrl}/sitemap.xml`,
    host: baseUrl
  };
}