I'm trying to create dynamic routes for a sitemap in the format [type]/sitemap-[type].xml.js.

As far as I understand from next's docs, the template paths ([type]/[type].js) will be populated by the props you export from getServerSideProps.

However, neither concatenating a string with a template (sitemap-[type].js), nor exporting a separate prop from getServerSideProps will work (see code below).

export async function getServerSideProps(context) {
  const {
    res,
    query: { type },
  } = context;

  ...

  return {
    props: {
      type,
      slug: `sitemap-${type}`,
    },
  };
}

What am I doing wrong? Is getServerSideProps capable of nested dynamic routing for xml files altogether?