try to make this check as fast as we can

Author: sarahs

lib/redirects/permalinks.js

@@ -1,6 +1,6 @@
 const patterns = require('../patterns')
 const { getVersionedPathWithLanguage, getVersionStringFromPath } = require('../path-utils')
-const allVersions = Object.keys(require('../all-versions'))
+const supportedVersions = new Set(Object.keys(require('../all-versions')))
 const getOldPathsFromPermalink = require('./get-old-paths-from-permalink')
 
 module.exports = function generateRedirectsForPermalinks (permalinks, redirectFrontmatter) {
@@ -27,7 +27,7 @@ module.exports = function generateRedirectsForPermalinks (permalinks, redirectFr
       frontmatterOldPath = frontmatterOldPath.replace(patterns.trailingSlash, '$1')
 
       // support hardcoded versions in redirect frontmatter
-      if (allVersions.includes(getVersionStringFromPath(frontmatterOldPath))) {
+      if (supportedVersions.has(frontmatterOldPath.split('/')[1])) {
         redirects[frontmatterOldPath] = permalink.href
         redirects[`/en${frontmatterOldPath}`] = permalink.href
       }