从angularjs 2库

Question

延长类当我尝试从一个类，它是在一个库基础上扩展https://github.com/jhades/angular2-library-example

即 - 类LIB：

export class Stuff { 
    foo: string = "BAR"; 
} 

类在我的应用程序

export class SomeClass extends Stuff { 
} 

---

我总是得到以下错误：

EXCEPTION: Uncaught (in promise): Error: Error in :0:0 caused by: Class  constructor Stuff cannot be invoked without 'new' 
TypeError: Class constructor Stuff cannot be invoked without 'new' 
at new HomeComponent (http://localhost:3000/main.bundle.js:46859:16) 
at new Wrapper_HomeComponent (/AppModule/HomeComponent/wrapper.ngfactory.js:7:18) 
at CompiledTemplate.proxyViewClass.View_HomeComponent_Host0.createInternal (/AppModule/HomeComponent/host.ngfactory.js:15:29) 
at CompiledTemplate.proxyViewClass.AppView.createHostView (http://localhost:3000/main.bundle.js:58198:21) 
at CompiledTemplate.proxyViewClass.DebugAppView.createHostView (http://localhost:3000/main.bundle.js:58458:52) 
at ComponentFactory.create (http://localhost:3000/main.bundle.js:28964:25) 
at ViewContainerRef_.createComponent (http://localhost:3000/main.bundle.js:42370:45) 
at RouterOutlet.activate (http://localhost:3000/main.bundle.js:46144:40) 
at ActivateRoutes.placeComponentIntoOutlet (http://localhost:3000/main.bundle.js:15248:16) 
at ActivateRoutes.activateRoutes (http://localhost:3000/main.bundle.js:15222:22) 
at http://localhost:3000/main.bundle.js:15177:58 
at Array.forEach (native) 

Answer 1

由于您不会继承父组件类的元数据，因此无法扩展组件。

这篇文章可以帮助您了解是什么问题：

https://medium.com/@ttemplier/angular2-decorators-and-class-inheritance-905921dbd1b7