feat: use ESM instead of commonjs (#9870)

__utils__/test-ipc-server/test/TestIpcServer.test.ts

@@ -1,14 +1,14 @@
 /// <reference lib="esnext.disposable" />
-import execa from 'execa'
 import fs from 'fs'
 import net from 'net'
 import path from 'path'
+import execa from 'execa'
 import { setTimeout } from 'timers/promises'
 import { promisify } from 'util'
 import { prepare } from '@pnpm/prepare'
 import { createTestIpcServer } from '@pnpm/test-ipc-server'
 
-const pnpmBin = path.join(__dirname, '../../../pnpm/bin/pnpm.cjs')
+const pnpmBin = path.join(import.meta.dirname, '../../../pnpm/bin/pnpm.mjs')
 
 describe('TestEchoServer', () => {
   describe('lifecycle', () => {

__utils__/test-ipc-server/test/tsconfig.json

@@ -2,8 +2,9 @@
   "extends": "../tsconfig.json",
   "compilerOptions": {
     "noEmit": false,
-    "outDir": "../test.lib",
-    "rootDir": "."
+    "outDir": "../node_modules/.test.lib",
+    "rootDir": "..",
+    "isolatedModules": true
   },
   "include": [
     "**/*.ts",