public/server/routes/sitemap.xml.ts

import { serverQueryContent } from "#content/server";
import { SitemapStream, streamToPromise } from "sitemap";

export default defineEventHandler(async (event) => {
  // Fetch all documents
  const docs = await serverQueryContent(event).find();
  const sitemap = new SitemapStream({ hostname: "https://eggworld.me" });
  for (const doc of docs) {
    sitemap.write({ url: doc._path, changefreq: "monthly" });
  }
  sitemap.end();
  return streamToPromise(sitemap);
});