src/pages/robots.txt.ts


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import type { APIContext, APIRoute } from "astro";

const getRobotsTxt = (sitemapURL: URL) => `
User-agent: *
Allow: /

Sitemap: ${sitemapURL.href}
`;

export const GET: APIRoute = ({ site }: APIContext): Response => {
  const sitemapURL = new URL("sitemap-index.xml", site);
  return new Response(getRobotsTxt(sitemapURL));
};