Polyfill fs.readdir withFileTypes for node 10.0 - 10.9

Fix: npm/cli#2623

cc: @ljharb

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 15.x]
+        node-version: [10.0.x, 10.x, 12.0.x, 12.x, 14.0.x, 14.x, 15.x]
         os: [ubuntu-latest, macOS-latest, windows-latest]
       fail-fast: false
 

index.js

@@ -22,6 +22,7 @@ const fs = require('fs')
 const readFile = promisify(fs.readFile)
 const readdir = promisify(fs.readdir)
 const stat = promisify(fs.stat)
+const lstat = promisify(fs.lstat)
 const {relative, resolve, basename, dirname} = require('path')
 const normalizePackageBin = require('npm-normalize-package-bin')
 
@@ -131,6 +132,18 @@ const pkgContents = async ({
 
   const recursePromises = []
 
+  // if we didn't get withFileTypes support, tack that on
+  if (typeof dirEntries[0] === 'string') {
+    // use a map so we can return a promise, but we mutate dirEntries in place
+    // this is much slower than getting the entries from the readdir call,
+    // but polyfills support for node versions before 10.10
+    await Promise.all(dirEntries.map(async (name, index) => {
+      const p = resolve(path, name)
+      const st = await lstat(p)
+      dirEntries[index] = Object.assign(st, {name})
+    }))
+  }
+
   for (const entry of dirEntries) {
     const p = resolve(path, entry.name)
     if (entry.isDirectory() === false) {

package.json

@@ -16,9 +16,11 @@
     "postpublish": "git push origin --follow-tags"
   },
   "tap": {
-    "check-coverage": true
+    "check-coverage": true,
+    "color": true
   },
   "devDependencies": {
+    "require-inject": "^1.4.4",
     "tap": "^14.11.0"
   },
   "dependencies": {