export function buildSitemap(opts: {
  siteUrl: string
  entries: { path: string; lastmod?: Date }[]
}) {
  const urls = opts.entries
    .map(
      (e) =>
        `<url><loc>${opts.siteUrl}${e.path}</loc>${
          e.lastmod ? `<lastmod>${e.lastmod.toISOString().slice(0, 10)}</lastmod>` : ''
        }</url>`,
    )
    .join('')
  return `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">${urls}</urlset>`
}