early-access-links.js

import { uniq } from 'lodash-es'

export default function earlyAccessContext(req, res, next) {
  if (process.env.NODE_ENV === 'production') {
    return next(404)
  }

  // Get a list of all hidden pages per version
  const earlyAccessPageLinks = uniq(
    Object.values(req.context.pages)
      .filter(
        (page) =>
          page.hidden &&
          page.relativePath.startsWith('early-access') &&
          !page.relativePath.endsWith('index.md')
      )
      .map((page) => page.permalinks)
      .flat()
  )
    // Get links for the current version
    .filter((permalink) => req.context.currentVersion === permalink.pageVersion)
    .sort()
    // Create Markdown links
    .map((permalink) => `- [${permalink.title}](${permalink.href})`)

  // Add to the rendering context
  // This is only used in the separate EA repo on local development
  req.context.earlyAccessPageLinks = earlyAccessPageLinks.length
    ? earlyAccessPageLinks.join('\n')
    : '_None for this version!_'

  return next()
}