diff --git a/.gitignore b/.gitignore
index 2d4a0d45..dc9d2e32 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ test/fixtures/ts/node_modules/aliyun-egg/
 !test/fixtures/test-files-glob/**
 !test/fixtures/test-files-stack/node_modules/
 !test/fixtures/example/node_modules/
+!test/fixtures/example-ts-cluster/node_modules/
 !test/fixtures/example-ts-error-stack/node_modules/
 !test/fixtures/egg-require/node_modules/
 test/fixtures/example-ts-ets/typings/
diff --git a/.travis.yml b/.travis.yml
index 924dff05..559b54f1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,18 +1,19 @@
 sudo: false
 language: node_js
 node_js:
-  - '6'
-  - '8'
-  - '10'
+  - "6"
+  - "8"
+  - "10"
 env:
   - EGG_VERSION=1
   - EGG_VERSION=2
 matrix:
   exclude:
-  - node_js: '6'
-    env: EGG_VERSION=2
+    - node_js: "6"
+      env: EGG_VERSION=2
+before_install:
+  - npm install npminstall -g
 install:
-  - npm i npminstall
   - sed -i.bak '/"egg":/d' package.json
   - npminstall -d
 script:
diff --git a/lib/cmd/cov.js b/lib/cmd/cov.js
index 9cf2b7e3..b4c1fa34 100644
--- a/lib/cmd/cov.js
+++ b/lib/cmd/cov.js
@@ -83,6 +83,11 @@ class CovCommand extends Command {
       }, env),
     };
 
+    // https://github.com/eggjs/egg/issues/3930
+    if (context.argv.typescript) {
+      opt.env.SPAWN_WRAP_SHIM_ROOT = path.join(cwd, 'node_modules');
+    }
+
     // save coverage-xxxx.json to $PWD/coverage
     const covArgs = yield this.getCovArgs(context);
     if (!covArgs) return;
diff --git a/test/fixtures/example-ts-cluster/app.ts b/test/fixtures/example-ts-cluster/app.ts
new file mode 100644
index 00000000..b9d7d67c
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/app.ts
@@ -0,0 +1,8 @@
+'use strict';
+
+import { Application } from 'egg';
+
+export default (app: Application) => {
+  console.log(`hi, egg, ${app.config.keys}`);
+  console.log(`ts env: ${process.env.EGG_TYPESCRIPT}`);
+};
diff --git a/test/fixtures/example-ts-cluster/app/controller/home.ts b/test/fixtures/example-ts-cluster/app/controller/home.ts
new file mode 100644
index 00000000..58053862
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/app/controller/home.ts
@@ -0,0 +1,11 @@
+'use strict';
+
+import { Controller } from 'egg';
+
+export default class HomeController extends Controller {
+  public async index() {
+    const obj: PlainObject = {};
+    obj.text = 'hi, egg';
+    this.ctx.body = obj.text;
+  }
+}
diff --git a/test/fixtures/example-ts-cluster/app/router.ts b/test/fixtures/example-ts-cluster/app/router.ts
new file mode 100644
index 00000000..f8cf3f6f
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/app/router.ts
@@ -0,0 +1,7 @@
+'use strict';
+
+import { Application } from 'egg';
+
+export default (app: Application) => {
+  app.router.get('/', app.controller.home.index);
+};
\ No newline at end of file
diff --git a/test/fixtures/example-ts-cluster/config/config.default.ts b/test/fixtures/example-ts-cluster/config/config.default.ts
new file mode 100644
index 00000000..106950bc
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/config/config.default.ts
@@ -0,0 +1,7 @@
+'use strict';
+
+export default () => {
+  const config = {} as any;
+  config.keys = '123456';
+  return config;
+};
diff --git a/test/fixtures/example-ts-cluster/node_modules/egg/index.js b/test/fixtures/example-ts-cluster/node_modules/egg/index.js
new file mode 100644
index 00000000..7102f7f7
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/node_modules/egg/index.js
@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = require('../../../../../node_modules/egg');
+
+setTimeout(() => {
+  console.log('exit by master test end')
+  process.exit(0);
+}, require('os').platform() === 'win32' ? 10000 : 6000);
diff --git a/test/fixtures/example-ts-cluster/node_modules/egg/package.json b/test/fixtures/example-ts-cluster/node_modules/egg/package.json
new file mode 100644
index 00000000..6697ad3f
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/node_modules/egg/package.json
@@ -0,0 +1,3 @@
+{
+  "name": "egg"
+}
diff --git a/test/fixtures/example-ts-cluster/package.json b/test/fixtures/example-ts-cluster/package.json
new file mode 100644
index 00000000..24d8c3e5
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "example-ts",
+  "egg": {
+    "typescript": true
+  }
+}
\ No newline at end of file
diff --git a/test/fixtures/example-ts-cluster/test/index.test.ts b/test/fixtures/example-ts-cluster/test/index.test.ts
new file mode 100644
index 00000000..a66d4387
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/test/index.test.ts
@@ -0,0 +1,25 @@
+"use strict";
+
+import mm, { MockOption } from "egg-mock";
+import request = require("supertest");
+
+describe("test/index.test.ts", () => {
+  let app: any;
+  before(() => {
+    app = mm.cluster({
+      opt: {
+        execArgv: ["--require", require.resolve("ts-node/register")]
+      }
+    } as MockOption);
+    return app.ready();
+  });
+
+  after(() => app.close());
+  it("should work", async () => {
+    const req = request(`http://127.0.0.1:${app.port}`);
+    return req
+      .get("/")
+      .expect("hi, egg")
+      .expect(200);
+  });
+});
diff --git a/test/fixtures/example-ts-cluster/tsconfig.json b/test/fixtures/example-ts-cluster/tsconfig.json
new file mode 100644
index 00000000..4f10abf7
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "es2017",
+    "module": "commonjs",
+    "strict": true,
+    "noImplicitAny": false,
+    "moduleResolution": "node",
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "pretty": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
+    "skipDefaultLibCheck": true,
+    "inlineSourceMap": true,
+    "importHelpers": true
+  },
+}
\ No newline at end of file
diff --git a/test/fixtures/example-ts-cluster/typings/app/controller/index.d.ts b/test/fixtures/example-ts-cluster/typings/app/controller/index.d.ts
new file mode 100644
index 00000000..de6b5d46
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/typings/app/controller/index.d.ts
@@ -0,0 +1,10 @@
+// This file was auto created by egg-ts-helper
+// Do not modify this file!!!!!!!!!
+
+import Home from '../../../app/controller/home';
+
+declare module 'egg' {
+  interface IController {
+    home: Home;
+  }
+}
diff --git a/test/fixtures/example-ts-cluster/typings/global.d.ts b/test/fixtures/example-ts-cluster/typings/global.d.ts
new file mode 100644
index 00000000..10aa1e9b
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/typings/global.d.ts
@@ -0,0 +1,3 @@
+interface PlainObject extends Object {
+  [key: string]: any;
+}
diff --git a/test/fixtures/example-ts-cluster/typings/index.d.ts b/test/fixtures/example-ts-cluster/typings/index.d.ts
new file mode 100644
index 00000000..f7e4b522
--- /dev/null
+++ b/test/fixtures/example-ts-cluster/typings/index.d.ts
@@ -0,0 +1,7 @@
+import { Context } from 'egg';
+
+// extend egg
+declare module 'egg' {
+  interface Context {
+  }
+}
\ No newline at end of file
diff --git a/test/ts.test.js b/test/ts.test.js
index 946ad04e..554c6b1b 100644
--- a/test/ts.test.js
+++ b/test/ts.test.js
@@ -74,6 +74,15 @@ describe('test/ts.test.js', () => {
         .expect('code', 0)
         .end();
     });
+
+    it('should cov app in cluster mod', () => {
+      cwd = path.join(__dirname, './fixtures/example-ts-cluster');
+      return coffee.fork(eggBin, [ 'cov', '--ts' ], { cwd })
+        // .debug()
+        .expect('stdout', process.env.NYC_ROOT_ID ? /Coverage summary/ : /Statements.*100%/)
+        .expect('code', 0)
+        .end();
+    });
   });
 
   describe('error stacks', () => {