diff --git a/.gitignore b/.gitignore
index a2e04d27..cf2f7015 100644
--- a/.gitignore
+++ b/.gitignore
@@ -105,5 +105,4 @@ dist
 
 #
 lib/
-temp/
-coverage/
\ No newline at end of file
+temp/
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
index efa37dba..1616cbcc 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,3 +1,4 @@
 {
-  "vetur.experimental.templateInterpolationService": true
+  "vetur.experimental.templateInterpolationService": true,
+  "typescript.tsdk": "node_modules/typescript/lib"
 }
diff --git a/jest.config.js b/jest.config.js
index a1ee7e10..c54d4afe 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,13 +1,19 @@
-module.exports = {
+// @ts-check
+
+/** @type {import("@jest/types").Config.InitialOptions} */
+const config = {
   preset: 'ts-jest',
   testMatch: ['**/*.spec.[jt]s?(x)'],
   globalSetup: './scripts/jestGlobalSetup.js',
   globalTeardown: './scripts/jestGlobalTeardown.js',
   setupFilesAfterEnv: ['./scripts/jestPerTestSetup.ts'],
   testTimeout: process.env.CI ? 60000 : 60000,
-  collectCoverage: true,
+  collectCoverage: false,
   collectCoverageFrom: ['packages/*/src/**/*.ts'],
+  detectOpenHandles: true,
   transform: {
     '^.+\\.ts$': 'ts-jest',
   },
 }
+
+module.exports = config
diff --git a/package.json b/package.json
index 4efb37e9..893e8afa 100644
--- a/package.json
+++ b/package.json
@@ -5,8 +5,8 @@
     "dev": "pnpm -r --filter ./packages --parallel run dev",
     "build": "pnpm -r --filter ./packages run build",
     "lint": "eslint --ext .js,.ts packages/*/src/**",
-    "test": "jest --runInBand --coverage=false",
-    "test:coverage": "jest --runInBand",
+    "test": "jest --runInBand",
+    "test:coverage": "jest --runInBand --coverage=true",
     "changelog": "pnpm -r --filter ./packages run changelog",
     "test:watch": "jest -w",
     "type-check": "pnpm -r --parallel --filter ./packages exec -- tsc --noEmit -p tsconfig.build.json",
diff --git a/packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox.ts b/packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox.ts
index f88038b3..437b4235 100644
--- a/packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox.ts
+++ b/packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox.ts
@@ -35,11 +35,7 @@ export async function viteBuild({
   }
 }
 
-export async function postTest() {
-  try {
-    // await fs.remove(tempDir)
-  } catch (e) {}
-}
+export function postTest() {}
 
 export async function startServer(isBuild: boolean) {
   // start dev server
diff --git a/packages/vite-plugin-checker/__tests__/e2e/build.spec.ts b/packages/vite-plugin-checker/__tests__/e2e/build.spec.ts
index e40138ef..63580d9d 100644
--- a/packages/vite-plugin-checker/__tests__/e2e/build.spec.ts
+++ b/packages/vite-plugin-checker/__tests__/e2e/build.spec.ts
@@ -4,6 +4,7 @@ import os from 'os'
 import CheckerPlugin from '../../lib/main'
 import { VlsChecker } from '../../../checker-vls/lib/main'
 import { MockSandbox } from './MockSandbox/MockSandbox'
+import { sleep, WORKER_CLEAN_TIMEOUT } from './testUtils'
 
 // ref https://github.com/facebook/jest/issues/936#issuecomment-613220940
 jest.mock('child_process', () => {
@@ -34,8 +35,9 @@ describe('build', () => {
     jest.clearAllMocks()
   })
 
-  afterAll(() => {
+  afterAll(async () => {
     jest.restoreAllMocks()
+    await sleep(WORKER_CLEAN_TIMEOUT)
   })
 
   it('typescript', () => {
diff --git a/packages/vite-plugin-checker/__tests__/e2e/testUtils.ts b/packages/vite-plugin-checker/__tests__/e2e/testUtils.ts
index 5826038e..d31ce7e9 100644
--- a/packages/vite-plugin-checker/__tests__/e2e/testUtils.ts
+++ b/packages/vite-plugin-checker/__tests__/e2e/testUtils.ts
@@ -6,9 +6,9 @@ export function slash(p: string): string {
   return p.replace(/\\/g, '/')
 }
 
+export const WORKER_CLEAN_TIMEOUT = process.env.CI ? 6000 : 3000
 export const testPath = expect.getState().testPath
 export const testName = slash(testPath).match(/playground\/([\w-]+)\//)?.[1]
-assert(testName, `should detect testName, but got null`)
 export const testDir = path.resolve(process.env.JEST_ROOT_DIR!, `./temp/${testName}`)
 
 export function editFile(
@@ -28,3 +28,11 @@ export function expectStdoutNotContains(str: string, unexpectedErrorMsg: string)
     stdout: expect(str).not.toContain(unexpectedErrorMsg),
   })
 }
+
+export async function sleep(millSeconds: number, callback?: Function) {
+  return new Promise<void>((resolve) => {
+    setTimeout(() => {
+      resolve()
+    }, millSeconds)
+  }).then(() => callback?.())
+}
diff --git a/packages/vite-plugin-checker/src/worker.ts b/packages/vite-plugin-checker/src/worker.ts
index f0432b52..418d09a1 100644
--- a/packages/vite-plugin-checker/src/worker.ts
+++ b/packages/vite-plugin-checker/src/worker.ts
@@ -1,5 +1,6 @@
 import { ConfigEnv } from 'vite'
 import { parentPort, Worker, workerData } from 'worker_threads'
+import invariant from 'tiny-invariant'
 
 import { ACTION_TYPES } from './types'
 
@@ -30,7 +31,9 @@ export function createScript<T>({
   buildBin,
   serverChecker,
 }: WorkerScriptOptions): Script<T> {
+  // let _env: ConfigEnv | undefined
   type CheckerConfig = T & SharedConfig
+  let _env: ConfigEnv
   return {
     mainScript: () => {
       // initialized in main thread
@@ -38,7 +41,9 @@ export function createScript<T>({
         checkerConfig: CheckerConfig,
         env: ConfigEnv
       ): ConfigureServeChecker => {
+        _env = env
         const isBuild = env.command === 'build'
+
         const worker = new Worker(absFilename, {
           workerData: { env, checkerConfig },
         })
@@ -73,7 +78,6 @@ export function createScript<T>({
       if (!parentPort) throw Error('should have parentPort as file runs in worker thread')
       const isBuild = workerData.env.command === 'build'
       // only run bin command and do not listen message in build mode
-      if (isBuild) return
 
       const port = parentPort.on(
         'message',
@@ -81,6 +85,7 @@ export function createScript<T>({
           switch (action.type) {
             case ACTION_TYPES.config: {
               const checkerConfig: T = workerData.checkerConfig
+              invariant(_env, 'env should be initialized in mainScript, but got undefined')
               diagnostic = serverChecker.createDiagnostic(checkerConfig)
               diagnostic.config(action.payload)
               break
@@ -96,6 +101,10 @@ export function createScript<T>({
           }
         }
       )
+
+      if (isBuild) {
+        port.unref()
+      }
     },
   }
 }
diff --git a/playground/react-ts/__tests__/build.spec.ts b/playground/react-ts/__tests__/build.spec.ts
index 40de13f2..bd86aa69 100644
--- a/playground/react-ts/__tests__/build.spec.ts
+++ b/playground/react-ts/__tests__/build.spec.ts
@@ -3,13 +3,20 @@ import {
   postTest,
   viteBuild,
 } from '../../../packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox'
-import { editFile, testDir } from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
+import {
+  editFile,
+  testDir,
+  sleep,
+  WORKER_CLEAN_TIMEOUT,
+} from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
 
 beforeAll(async () => {
   await preTest()
 })
 
-afterAll(postTest)
+afterAll(async () => {
+  await sleep(WORKER_CLEAN_TIMEOUT)
+})
 
 describe('typescript', () => {
   // describe('dev', () => {
diff --git a/playground/vue2-vls/__tests__/build.spec.ts b/playground/vue2-vls/__tests__/build.spec.ts
index e650df05..e201d13b 100644
--- a/playground/vue2-vls/__tests__/build.spec.ts
+++ b/playground/vue2-vls/__tests__/build.spec.ts
@@ -3,13 +3,20 @@ import {
   postTest,
   viteBuild,
 } from '../../../packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox'
-import { testDir, editFile } from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
+import {
+  testDir,
+  editFile,
+  sleep,
+  WORKER_CLEAN_TIMEOUT,
+} from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
 
 beforeAll(async () => {
   await preTest()
 })
 
-afterAll(postTest)
+afterAll(async () => {
+  await sleep(WORKER_CLEAN_TIMEOUT)
+})
 
 describe('vue2-vls', () => {
   // describe('dev', () => {
diff --git a/playground/vue3-vue-tsc/__tests__/build.spec.ts b/playground/vue3-vue-tsc/__tests__/build.spec.ts
index 88871e26..e5d48439 100644
--- a/playground/vue3-vue-tsc/__tests__/build.spec.ts
+++ b/playground/vue3-vue-tsc/__tests__/build.spec.ts
@@ -1,15 +1,22 @@
 import {
-  preTest,
   postTest,
+  preTest,
   viteBuild,
 } from '../../../packages/vite-plugin-checker/__tests__/e2e/Sandbox/Sandbox'
-import { testDir, editFile } from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
+import {
+  editFile,
+  sleep,
+  testDir,
+  WORKER_CLEAN_TIMEOUT,
+} from '../../../packages/vite-plugin-checker/__tests__/e2e/testUtils'
 
 beforeAll(async () => {
   await preTest()
 })
 
-afterAll(postTest)
+afterAll(async () => {
+  await sleep(WORKER_CLEAN_TIMEOUT)
+})
 
 describe('vue3-vue-tsc', () => {
   // describe('dev', () => {