TS 与 依赖注入

[herrdu]

1. 技术依赖 metadata

2. 相关讨论 Angular DI [How nestjs works and runs constructors with parameter](https://stackoverflow.com/questions/59867345/how-nestjs-works-and-runs-constructors-with-parameter)

3. 技术分析

   AppController = __decorate([
   common_1.Controller(),
   __metadata("design:paramtypes", [auth_service_1.AuthService,
       app_service_1.AppService])
   ], AppController);