diff --git a/README.md b/README.md
index 5d9ef3d..364e0b7 100644
--- a/README.md
+++ b/README.md
@@ -185,14 +185,14 @@ mm.app({
 });
 ```
 
-Environment list https://github.com/eggjs/egg-core/blob/master/lib/loader/egg_loader.js#L82
+Environment list <https://github.com/eggjs/egg-core/blob/master/lib/loader/egg_loader.js#L82>
 
 ### mm.consoleLevel(level)
 
 Mock level that print to stdout/stderr
 
 ```js
-// 不输出到终端
+// DON'T log to terminal
 mm.consoleLevel('NONE');
 ```
 
@@ -265,6 +265,12 @@ Clean all logs directory, default is true.
 
 If you are using `ava`, disable it.
 
+#### typescript {Boolean}
+
+Enable Typescript support, default is false.
+
+Support read from `process.env.EGG_TYPESCRIPT`.
+
 ### app.httpRequest()
 
 Request current app http server.
@@ -341,7 +347,6 @@ const ctx = app.mockContext();
 console.log(ctx.session.foo);
 ```
 
-
 ### app.mockService(service, methodName, fn)
 
 ```js
@@ -349,7 +354,7 @@ it('should mock user name', function* () {
   app.mockService('user', 'getName', function* (ctx, methodName, args) {
     return 'popomore';
   });
-  const ctx = app.mockContext();  
+  const ctx = app.mockContext();
   yield ctx.service.user.getName();
 });
 ```
@@ -362,7 +367,7 @@ You can mock an error for service
 app.mockServiceError('user', 'home', new Error('mock error'));
 ```
 
-### app.mockCsrf();
+### app.mockCsrf()
 
 ```js
 app.mockCsrf();
diff --git a/README.zh_CN.md b/README.zh_CN.md
index 534c81b..596ded2 100644
--- a/README.zh_CN.md
+++ b/README.zh_CN.md
@@ -190,7 +190,7 @@ mm.app({
 });
 ```
 
-具体值见 https://github.com/eggjs/egg-core/blob/master/lib/loader/egg_loader.js#L82
+具体值见 <https://github.com/eggjs/egg-core/blob/master/lib/loader/egg_loader.js#L82>
 
 ### mm.consoleLevel(level)
 
@@ -203,7 +203,6 @@ mm.consoleLevel('NONE');
 
 可选 level 为 `DEBUG`, `INFO`, `WARN`, `ERROR`, `NONE`
 
-
 ### mm.home(homePath)
 
 模拟操作系统用户目录
@@ -276,6 +275,12 @@ mm.app({
 
 如果是通过 ava 等并行测试框架进行测试，需要手动在执行测试前进行统一的日志清理，不能通过 mm 来处理，设置 `clean` 为 `false`。
 
+#### typescript {Boolean}
+
+开启 TypeScript 支持，默认关闭。
+
+支持读取环境变量 `process.env.EGG_TYPESCRIPT`。
+
 ### app.httpRequest()
 
 请求当前应用 http 服务的辅助工具。
@@ -361,7 +366,7 @@ it('should mock user name', function* () {
   app.mockService('user', 'getName', function* (ctx, methodName, args) {
     return 'popomore';
   });
-  const ctx = app.mockContext();  
+  const ctx = app.mockContext();
   yield ctx.service.user.getName();
 });
 ```
@@ -374,7 +379,7 @@ it('should mock user name', function* () {
 app.mockServiceError('user', 'home', new Error('mock error'));
 ```
 
-### app.mockCsrf();
+### app.mockCsrf()
 
 模拟 csrf，不用传递 token
 
diff --git a/bootstrap.js b/bootstrap.js
index 2c80e19..1eaf5a8 100644
--- a/bootstrap.js
+++ b/bootstrap.js
@@ -5,6 +5,7 @@ const mock = require('./index').default;
 
 const options = {};
 if (process.env.EGG_BASE_DIR) options.baseDir = process.env.EGG_BASE_DIR;
+if (process.env.EGG_TYPESCRIPT) options.typescript = process.env.EGG_TYPESCRIPT;
 const app = mock.app(options);
 
 before(() => app.ready());
diff --git a/index.d.ts b/index.d.ts
index 21f5a24..de2d443 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -82,6 +82,11 @@ export interface MockOption {
    * Remove $baseDir/logs
    */
   clean?: boolean;
+
+  /**
+   * Enable typescript support
+   */
+  typescript?: boolean;
 }
 
 type EnvType = 'default' | 'test' | 'prod' | 'local' | 'unittest';
diff --git a/lib/cluster.js b/lib/cluster.js
index acf8b9c..594b089 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -51,6 +51,7 @@ class ClusterApplication extends Coffee {
    * - {String} baseDir - The directory of the application
    * - {Object} plugins - Tustom you plugins
    * - {String} framework - The directory of the egg framework
+   * - {Boolean} [typescript]  - Enable TypeScript support
    * - {Boolean} [cache=true]  - Cache application based on baseDir
    * - {Boolean} [coverage=true]  - Swtich on process coverage, but it'll be slower
    * - {Boolean} [clean=true]  - Remove $baseDir/logs