diff --git a/.eslintrc b/.eslintrc
index c799fe5..9bcdb46 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,3 +1,6 @@
 {
-  "extends": "eslint-config-egg"
+  "extends": [
+    "eslint-config-egg/typescript",
+    "eslint-config-egg/lib/rules/enforce-node-prefix"
+  ]
 }
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index c8630f5..1a2cd21 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -12,6 +12,6 @@ jobs:
     uses: node-modules/github-actions/.github/workflows/node-test.yml@master
     with:
       os: 'ubuntu-latest, macos-latest'
-      version: '14, 16, 18, 20, 22'
+      version: '18.19.0, 20, 22'
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 0fe7e40..c010914 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,8 @@ node_modules/
 coverage/
 test/fixtures/**/run
 .DS_Store
+.tshy*
+.eslintcache
+dist
+package-lock.json
+.package-lock.json
diff --git a/README.md b/README.md
index aa2cb2e..8855287 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# egg-development
+# @eggjs/development
 
 [![NPM version][npm-image]][npm-url]
 [![Node.js CI](https://github.com/eggjs/egg-development/actions/workflows/nodejs.yml/badge.svg)](https://github.com/eggjs/egg-development/actions/workflows/nodejs.yml)
@@ -6,6 +6,7 @@
 [![Known Vulnerabilities][snyk-image]][snyk-url]
 [![npm download][download-image]][download-url]
 [![Node.js Version](https://img.shields.io/node/v/egg-development.svg?style=flat)](https://nodejs.org/en/download/)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](https://makeapullrequest.com)
 
 [npm-image]: https://img.shields.io/npm/v/egg-development.svg?style=flat-square
 [npm-url]: https://npmjs.org/package/egg-development
@@ -75,6 +76,6 @@ Please open an issue [here](https://github.com/eggjs/egg/issues).
 
 ## Contributors
 
-[![Contributors](https://contrib.rocks/image?repo=eggjs/egg-development)](https://github.com/eggjs/egg-development/graphs/contributors)
+[![Contributors](https://contrib.rocks/image?repo=eggjs/development)](https://github.com/eggjs/development/graphs/contributors)
 
 Made with [contributors-img](https://contrib.rocks).
diff --git a/config/config.default.js b/config/config.default.js
deleted file mode 100755
index 4a139be..0000000
--- a/config/config.default.js
+++ /dev/null
@@ -1,19 +0,0 @@
-/**
- * @member Config#development
- * @property {Array} watchDirs - dirs needed watch, when files under these change, application will reload, use relative path
- * @property {Array} ignoreDirs - dirs don't need watch, including subdirectories, use relative path
- * @property {Boolean} fastReady - don't wait all plugins ready, default is false.
- * @property {Boolean} reloadOnDebug - whether reload on debug, default is true.
- * @property {Boolean} overrideDefault - whether override default watchDirs, default is false.
- * @property {Boolean} overrideIgnore - whether override default ignoreDirs, default is false.
- * @property {Array|String} reloadPattern - whether to reload, use https://github.com/sindresorhus/multimatch
- */
-exports.development = {
-  watchDirs: [],
-  ignoreDirs: [],
-  fastReady: false,
-  reloadOnDebug: true,
-  overrideDefault: false,
-  overrideIgnore: false,
-  reloadPattern: undefined,
-};
diff --git a/package.json b/package.json
index 9cb0bc3..1b447cd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,9 @@
 {
-  "name": "egg-development",
+  "name": "@eggjs/development",
   "version": "3.0.2",
+  "publishConfig": {
+    "access": "public"
+  },
   "description": "development tool for egg",
   "eggPlugin": {
     "name": "development",
@@ -9,7 +12,12 @@
     ],
     "dependencies": [
       "watcher"
-    ]
+    ],
+    "exports": {
+      "import": "./dist/esm",
+      "require": "./dist/commonjs",
+      "typescript": "./src"
+    }
   },
   "keywords": [
     "egg",
@@ -18,42 +26,72 @@
     "eggPlugin"
   ],
   "dependencies": {
+    "@eggjs/core": "^6.2.11",
     "debounce": "^1.1.0",
     "multimatch": "^5.0.0",
     "utility": "^2.4.0"
   },
   "devDependencies": {
-    "@types/node": "^22.10.2",
-    "egg": "3",
-    "egg-bin": "6",
-    "egg-mock": "5",
+    "@arethetypeswrong/cli": "^0.17.2",
+    "@eggjs/bin": "7",
+    "@eggjs/mock": "6",
+    "@eggjs/supertest": "8",
+    "@eggjs/tsconfig": "1",
+    "@types/mocha": "10",
+    "@types/node": "22",
+    "egg": "beta",
     "eslint": "8",
-    "eslint-config-egg": "12",
-    "supertest": "^3.4.2"
+    "eslint-config-egg": "14",
+    "rimraf": "^6.0.1",
+    "tshy": "3",
+    "tshy-after": "1",
+    "typescript": "5"
   },
   "engines": {
-    "node": ">=14.0.0"
+    "node": ">=18.19.0"
   },
   "scripts": {
-    "test": "npm run lint -- --fix && npm run test-local",
-    "test-local": "egg-bin test --ts false",
-    "cov": "egg-bin cov --ts false",
-    "lint": "eslint .",
-    "ci": "npm run lint && npm run cov"
+    "lint": "eslint --cache src test --ext .ts",
+    "pretest": "npm run clean && npm run lint -- --fix",
+    "test": "egg-bin test",
+    "preci": "npm run clean &&  npm run lint",
+    "ci": "egg-bin cov",
+    "postci": "npm run prepublishOnly && npm run clean",
+    "clean": "rimraf dist",
+    "prepublishOnly": "tshy && tshy-after && attw --pack"
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/eggjs/egg-development.git"
+    "url": "git+https://github.com/eggjs/development.git"
   },
-  "files": [
-    "app",
-    "config",
-    "lib",
-    "agent.js",
-    "app.js"
-  ],
   "bugs": "https://github.com/eggjs/egg/issues",
-  "homepage": "https://github.com/eggjs/egg-development#readme",
+  "homepage": "https://github.com/eggjs/development#readme",
   "author": "jtyjty99999",
-  "license": "MIT"
+  "license": "MIT",
+  "type": "module",
+  "tshy": {
+    "exports": {
+      ".": "./src/index.ts",
+      "./package.json": "./package.json"
+    }
+  },
+  "exports": {
+    ".": {
+      "import": {
+        "types": "./dist/esm/index.d.ts",
+        "default": "./dist/esm/index.js"
+      },
+      "require": {
+        "types": "./dist/commonjs/index.d.ts",
+        "default": "./dist/commonjs/index.js"
+      }
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist",
+    "src"
+  ],
+  "types": "./dist/commonjs/index.d.ts",
+  "main": "./dist/commonjs/index.js"
 }
diff --git a/agent.js b/src/agent.ts
similarity index 92%
rename from agent.js
rename to src/agent.ts
index 7fe6ef7..f5d29ef 100755
--- a/agent.js
+++ b/src/agent.ts
@@ -1,8 +1,8 @@
-const path = require('node:path');
-const fs = require('node:fs/promises');
-const debounce = require('debounce');
-const multimatch = require('multimatch');
-const { exists } = require('utility');
+import path from 'node:path';
+import fs from 'node:fs/promises';
+import debounce from 'debounce';
+import multimatch from 'multimatch';
+import { exists } from 'utility';
 
 module.exports = agent => {
   // clean all timing json
diff --git a/app.js b/src/app.ts
similarity index 100%
rename from app.js
rename to src/app.ts
diff --git a/app/middleware/egg_loader_trace.js b/src/app/middleware/egg_loader_trace.ts
similarity index 69%
rename from app/middleware/egg_loader_trace.js
rename to src/app/middleware/egg_loader_trace.ts
index b49f4e5..d479264 100644
--- a/app/middleware/egg_loader_trace.js
+++ b/src/app/middleware/egg_loader_trace.ts
@@ -1,20 +1,23 @@
-const path = require('node:path');
-const fs = require('node:fs/promises');
-const { readJSON } = require('utility');
+import path from 'node:path';
+import fs from 'node:fs/promises';
+import { readJSON } from 'utility';
+import type { EggCore, MiddlewareFunc } from '@eggjs/core';
 
-module.exports = (_, app) => {
+export default (_: unknown, app: EggCore): MiddlewareFunc => {
   return async (ctx, next) => {
-    if (ctx.path !== '/__loader_trace__') return await next();
+    if (ctx.path !== '/__loader_trace__') {
+      return await next();
+    }
     const template = await fs.readFile(path.join(__dirname, '../../lib/loader_trace.html'), 'utf8');
     const data = await loadTimingData(app);
     ctx.body = template.replace('{{placeholder}}', JSON.stringify(data));
   };
 };
 
-async function loadTimingData(app) {
+async function loadTimingData(app: EggCore) {
   const rundir = app.config.rundir;
   const files = await fs.readdir(rundir);
-  const data = [];
+  const data: any[] = [];
   for (const file of files) {
     if (!/^(agent|application)_timing/.test(file)) continue;
     const json = await readJSON(path.join(rundir, file));
diff --git a/src/config/config.default.ts b/src/config/config.default.ts
new file mode 100755
index 0000000..b10b9c7
--- /dev/null
+++ b/src/config/config.default.ts
@@ -0,0 +1,52 @@
+export interface DevelopmentConfig {
+  /**
+   * dirs needed watch, when files under these change, application will reload, use relative path
+   */
+  watchDirs: string[];
+  /**
+   * dirs don't need watch, including subdirectories, use relative path
+   */
+  ignoreDirs: string[];
+  /**
+   * don't wait all plugins ready, default is false.
+   */
+  fastReady: boolean;
+  /**
+   * whether reload on debug, default is true.
+   */
+  reloadOnDebug: boolean;
+  /**
+   * whether override default watchDirs, default is false.
+   */
+  overrideDefault: boolean;
+  /**
+   * whether override default ignoreDirs, default is false.
+   */
+  overrideIgnore: boolean;
+  /**
+   * whether to reload, use https://github.com/sindresorhus/multimatch
+   */
+  reloadPattern?: string[] | string;
+}
+
+/**
+ * @member Config#development
+ * @property {Array} watchDirs - dirs needed watch, when files under these change, application will reload, use relative path
+ * @property {Array} ignoreDirs - dirs don't need watch, including subdirectories, use relative path
+ * @property {Boolean} fastReady - don't wait all plugins ready, default is false.
+ * @property {Boolean} reloadOnDebug - whether reload on debug, default is true.
+ * @property {Boolean} overrideDefault - whether override default watchDirs, default is false.
+ * @property {Boolean} overrideIgnore - whether override default ignoreDirs, default is false.
+ * @property {Array|String} reloadPattern - whether to reload, use https://github.com/sindresorhus/multimatch
+ */
+export default {
+  development: {
+    watchDirs: [],
+    ignoreDirs: [],
+    fastReady: false,
+    reloadOnDebug: true,
+    overrideDefault: false,
+    overrideIgnore: false,
+    reloadPattern: undefined,
+  } as DevelopmentConfig,
+};
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..ce5fb25
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1 @@
+import './types.js';
diff --git a/lib/loader_trace.html b/src/lib/loader_trace.html
similarity index 100%
rename from lib/loader_trace.html
rename to src/lib/loader_trace.html
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..82f8714
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,8 @@
+import type { DevelopmentConfig } from './config/config.default.js';
+
+declare module '@eggjs/core' {
+  // add EggAppConfig overrides types
+  interface EggAppConfig {
+    development: DevelopmentConfig;
+  }
+}
diff --git a/test/development-ts.test.ts b/test/development-ts.test.ts
new file mode 100755
index 0000000..cf82b29
--- /dev/null
+++ b/test/development-ts.test.ts
@@ -0,0 +1,58 @@
+import fs from 'node:fs/promises';
+import { strict as assert } from 'node:assert';
+import { scheduler } from 'node:timers/promises';
+import { mm, MockApplication } from '@eggjs/mock';
+import { escape, getFilepath } from './utils.js';
+
+describe('test/development-ts.test.ts', () => {
+  let app: MockApplication;
+  before(() => {
+    mm.env('local');
+    app = mm.cluster({
+      baseDir: 'development-ts',
+    });
+    return app.ready();
+  });
+  after(() => app.close());
+  afterEach(mm.restore);
+  // for debounce
+  afterEach(() => scheduler.wait(500));
+
+  it('should reload when change service', async () => {
+    const filepath = getFilepath('development-ts/app/service/a.ts');
+    await fs.writeFile(filepath, '');
+    await scheduler.wait(5000);
+
+    await fs.unlink(filepath);
+    app.expect('stdout', new RegExp(escape(`reload worker because ${filepath}`)));
+  });
+
+  it('should not reload when change assets', async () => {
+    const filepath = getFilepath('development-ts/app/assets/b.js');
+    await fs.writeFile(filepath, '');
+    await scheduler.wait(5000);
+
+    await fs.unlink(filepath);
+    app.notExpect('stdout', new RegExp(escape(`reload worker because ${filepath}`)));
+  });
+
+  it('should reload once when 2 file change', async () => {
+    const filepath = getFilepath('development-ts/app/service/c.js');
+    const filepath1 = getFilepath('development-ts/app/service/d.js');
+    await fs.writeFile(filepath, '');
+    // set a timeout for watcher's interval
+    await scheduler.wait(1000);
+    await fs.writeFile(filepath1, '');
+
+    await scheduler.wait(2000);
+    await fs.unlink(filepath);
+    await fs.unlink(filepath1);
+
+    assert.equal(count(app.stdout, 'reload worker'), 2);
+  });
+});
+
+function count(str: string, match: string) {
+  const m = str.match(new RegExp(match, 'g'));
+  return m ? m.length : 0;
+}
diff --git a/test/fixtures/development-ts/app/assets/.gitkeep b/test/fixtures/development-ts/app/assets/.gitkeep
new file mode 100755
index 0000000..e69de29
diff --git a/test/fixtures/development-ts/app/public/foo.js b/test/fixtures/development-ts/app/public/foo.js
new file mode 100755
index 0000000..fb1c35f
--- /dev/null
+++ b/test/fixtures/development-ts/app/public/foo.js
@@ -0,0 +1 @@
+alert('bar');
diff --git a/test/fixtures/development-ts/app/router.ts b/test/fixtures/development-ts/app/router.ts
new file mode 100755
index 0000000..235cc82
--- /dev/null
+++ b/test/fixtures/development-ts/app/router.ts
@@ -0,0 +1,11 @@
+import { Application } from 'egg';
+
+export default (app: Application) => {
+  app.get('/foo.js', async ctx => {
+    ctx.body = 'foo.js';
+  });
+
+  app.get('/foo', async ctx => {
+    ctx.body = 'foo';
+  });
+};
diff --git a/test/fixtures/development-ts/app/service/.gitkeep b/test/fixtures/development-ts/app/service/.gitkeep
new file mode 100755
index 0000000..e69de29
diff --git a/test/fixtures/development-ts/config/config.default.ts b/test/fixtures/development-ts/config/config.default.ts
new file mode 100644
index 0000000..c791c22
--- /dev/null
+++ b/test/fixtures/development-ts/config/config.default.ts
@@ -0,0 +1,10 @@
+import '../../../../src/index.js';
+
+import { EggAppConfig } from 'egg';
+
+export default {
+  keys: 'foo,bar',
+  development: {
+    fastReady: false,
+  },
+} as EggAppConfig;
diff --git a/test/fixtures/development-ts/package.json b/test/fixtures/development-ts/package.json
new file mode 100755
index 0000000..35c06e7
--- /dev/null
+++ b/test/fixtures/development-ts/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "development-ts",
+  "type": "module"
+}
diff --git a/test/fixtures/development-ts/tsconfig.json b/test/fixtures/development-ts/tsconfig.json
new file mode 100644
index 0000000..ff41b73
--- /dev/null
+++ b/test/fixtures/development-ts/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "@eggjs/tsconfig",
+  "compilerOptions": {
+    "strict": true,
+    "noImplicitAny": true,
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext"
+  }
+}
diff --git a/test/utils.js b/test/utils.js
deleted file mode 100644
index a9d4f2a..0000000
--- a/test/utils.js
+++ /dev/null
@@ -1,11 +0,0 @@
-exports.escape = str => {
-  return str
-    .replace(/[|\\{}()[\]^$+*?.]/g, '\\$&')
-    .replace(/-/g, '\\x2d');
-};
-
-exports.sleep = ms => {
-  return new Promise(resolve => {
-    setTimeout(resolve, ms);
-  });
-};
diff --git a/test/utils.ts b/test/utils.ts
new file mode 100644
index 0000000..d1cfc08
--- /dev/null
+++ b/test/utils.ts
@@ -0,0 +1,15 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const fixtures = path.join(__dirname, 'fixtures');
+
+export function getFilepath(name: string) {
+  return path.join(fixtures, name);
+}
+
+export function escape(str: string) {
+  return str
+    .replace(/[|\\{}()[\]^$+*?.]/g, '\\$&')
+    .replace(/-/g, '\\x2d');
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..ff41b73
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "@eggjs/tsconfig",
+  "compilerOptions": {
+    "strict": true,
+    "noImplicitAny": true,
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext"
+  }
+}