text: const languages = require('../lib/languages')
  const enterpriseServerReleases = require('../lib/enterprise-server-releases')
  const allVersions = require('../lib/all-versions')
  const allProducts = require('../lib/all-products')
  const activeProducts = Object.values(allProducts).filter(product => !product.wip && !product.hidden)
  const { getVersionStringFromPath, getProductStringFromPath, getPathWithoutLanguage } = require('../lib/path-utils')
  const productNames = require('../lib/product-names')
  const warmServer = require('../lib/warm-server')
  const featureFlags = Object.keys(require('../feature-flags'))
  
  // Supply all route handlers with a baseline `req.context` object
  // Note that additional middleware in middleware/index.js adds to this context object
  module.exports = async function contextualize (req, res, next) {
    // Ensure that we load some data only once on first request
    const { site, redirects, siteTree, pages: pageMap } = await warmServer()
  
    req.context = {}
  
    // make feature flag environment variables accessible in layouts
    req.context.process = { env: {} }
    featureFlags.forEach(featureFlagName => {
      req.context.process.env[featureFlagName] = process.env[featureFlagName]
    })
  
    // define each context property explicitly for code-search friendliness
    // e.g. searches for "req.context.page" will include results from this file
    req.context.currentLanguage = req.language
    req.context.currentVersion = getVersionStringFromPath(req.path)
    req.context.currentProduct = getProductStringFromPath(req.path)
    req.context.allProducts = allProducts
    req.context.activeProducts = activeProducts
    req.context.allVersions = allVersions
    req.context.currentPathWithoutLanguage = getPathWithoutLanguage(req.path)
    req.context.currentPath = req.path
    req.context.query = req.query
    req.context.languages = languages
    req.context.productNames = productNames
    req.context.enterpriseServerReleases = enterpriseServerReleases
    req.context.enterpriseServerVersions = Object.keys(allVersions).filter(version => version.startsWith('enterprise-server@'))
    req.context.redirects = redirects
    req.context.site = site[req.language].site
    req.context.siteTree = siteTree
    req.context.pages = pageMap
  
    return next()
  }
  