@x-govuk/govuk-eleventy-plugin/src/collections/sitemap.js

Write documentation using Markdown and publish it using GOV.UK styles

export const sitemap = (collection) => {
  return collection.getAllSorted().filter((item) => {
    // Only return content that was originally a Markdown file
    const extension = item.inputPath.split('.').pop()
    return extension === 'md'
  })
}