decorators on generator functions parse error with --typescript

Created by: wangtao0101

Is this a bug report?

(write your answer here) Yes

Did you try recovering your dependencies?

(Write your answer here.) npm --version 6.4.1

Which terms did you search for in User Guide?

(Write your answer here if relevant.) decorators on generator functions parse error with --typescript

Environment

(paste the output of the command here)

Environment Info:

System: OS: Windows 10 CPU: x64 Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz Binaries: Yarn: 1.10.1 - C:\Program Files\nodejs\yarn.CMD npm: 6.1.0 - C:\Program Files\nodejs\npm.CMD Browsers: Edge: 42.17134.1.0 Internet Explorer: 11.0.17134.1 npmPackages: react: ^16.8.4 => 16.8.4 react-dom: ^16.8.4 => 16.8.4 react-scripts: Not Found npmGlobalPackages: create-react-app: Not Found

Steps to Reproduce

(Write your steps here:)

1. create-react-app my-app typescript
2. add experimentalDecorators in tsconfig.json
3. add related code

@effect() // define async action handle
    * addAsync(count: number) {
        yield delay(2000);
        this.add(count); // type check here
    }

Expected Behavior

(Write what you thought would happen.)

parse success

Actual Behavior

(Write what happened. Please add screenshots!)

./src/AppModel.ts
SyntaxError: C:\Users\zeroone\Desktop\my-app\src\AppModel.ts: Unexpected token (17:30)

  15 | export default class AppModel extends Model<AppState> {
  16 |     @effect() // define async action handle
> 17 |     * addAsync(count: number) {
     |                               ^
  18 |         yield delay(2000);
  19 |         this.add(count); // type check here
  20 |     }

Reproducible Demo

(Paste the link to an example project and exact instructions to reproduce the issue.)