remove the need for the async NPM package (github#27119)

Author: peterbe

tests/meta/orphan-tests.js

@@ -1,6 +1,6 @@
+import { statSync } from 'fs'
 import fs from 'fs/promises'
 import path from 'path'
-import { filter as asyncFilter } from 'async'
 
 describe('check for orphan tests', () => {
   test('all tests are in sub-directories', async () => {
@@ -11,14 +11,10 @@ describe('check for orphan tests', () => {
     // Get a list of files/directories in `/tests`
     const testDirectory = await fs.readdir(pathToTests)
 
-    // Filter out our exceptions
-    let filteredList = testDirectory.filter((item) => !EXCEPTIONS.includes(item))
-
-    // Don't include directories
-    filteredList = await asyncFilter(
-      filteredList,
-      async (item) => !(await fs.stat(path.join(pathToTests, item))).isDirectory()
-    )
+    // Filter out our exceptions and directories
+    const filteredList = testDirectory
+      .filter((item) => !EXCEPTIONS.includes(item))
+      .filter((item) => !statSync(path.join(pathToTests, item)).isDirectory())
 
     expect(filteredList).toHaveLength(0)
   })