only require fs.promises

lib/create-tree.js

@@ -1,4 +1,4 @@
-const fs = require('fs')
+const fs = require('fs').promises
 const path = require('path')
 const Page = require('./page')
 const { sortBy } = require('lodash')
@@ -14,7 +14,7 @@ module.exports = async function createTree (originalPath, langObj) {
   // Otherwise, assume it's a child .md file and add `.md` to the path.
   let filepath
   try {
-    await fs.promises.access(originalPath)
+    await fs.access(originalPath)
     filepath = `${originalPath}/index.md`
   } catch {
     filepath = `${originalPath}.md`