docs/middleware/contextualizers/product-examples.js

const getApplicableVersions = require('../../lib/get-applicable-versions')

module.exports = async function productExamples (req, res, next) {
  if (!req.context.page) return next()
  if (req.context.currentLayoutName !== 'product-landing') return next()

  const productExamples = req.context.site.data['product-examples'][req.context.currentProduct]
  if (!productExamples) return next()

  req.context.productCommunityExamples = productExamples['community-examples']
  req.context.productUserExamples = productExamples['user-examples']

  // We currently only support versioning in code examples.
  // TODO support versioning across all example types.
  req.context.productCodeExamples = productExamples['code-examples'] && productExamples['code-examples']
    .filter(example => {
      // If an example block does NOT contain the versions prop, assume it's available in all versions
      return !example.versions || getApplicableVersions(example.versions).includes(req.context.currentVersion)
    })

  return next()
}