sitemap.xml and robots.txt for 11ty (Eleventy)

robots.txt.njk

---
eleventyExcludeFromCollections: true
eleventyComputed:
  permalink: "{{ site.robots }}"
---
Sitemap: {{ site.baseUrl + site.siteMap }}

User-agent: *
Disallow:

site.json

{
  "baseUrl": "https://example.com",
  "robots": "/robots.txt",
  "siteMap": "/sitemap.xml"
}

sitemap.njk

---
permalink: /sitemap.xml
eleventyExcludeFromCollections: true
---
<?xml version="1.0" encoding="utf-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    {% for page in collections.all %}
        <url>
            <loc>{{ site.baseUrl }}{{ page.url | url }}</loc>
            <lastmod>{{ page.date.toISOString() }}</lastmod>
        </url>
    {% endfor %}
</urlset>

Place site.json in the _data directory, and place robots.txt.njk and sitemap.njk at the root of the project.