Angular 类型脚本错误-ComponentRef上的TS2339

我面临打字错误

错误TS2339:类型{}上不存在属性“close”

我面临问题的代码：-

home.directive.ts

    import { Directive, ComponentFactoryResolver, ComponentRef, ViewContainerRef } from '@angular/core'; 
@Directive({
  selector: '[child]'
})
export class HomeDirective {
  constructor(private viewContainer: ViewContainerRef,
    private componentFactoryResolver: ComponentFactoryResolver) {
  }
  openComp(component:any) : ComponentRef<any> {
    this.viewContainer.clear();
    let componentFactory =
      this.componentFactoryResolver.resolveComponentFactory(component);
    let componentRef = this.viewContainer.createComponent(componentFactory);
    componentRef.instance.close.subscribe(() => {
            //do something
            });

    return componentRef;
  }

}

import {  Component, EventEmitter } from '@angular/core';
import { HomeService } from '../home.service';
@Component({
  selector: 'child-component',
  providers: [HomeService],
  template: `<h3>child-component</h3>`
})
export class ChildComponent {
  close = new EventEmitter();
  constructor() {
  }
  ngOnDestroy() {
    this.close.emit('closed');
  }
}

import {  Component ,ViewChild } from '@angular/core';
import { HomeService } from './home.service';
import { HomeDirective } from './home.directive';
import { ChildComponent } from './child/index';
@Component({
  moduleId: module.id,
  selector: 'sd-home',
  providers: [HomeService],
  templateUrl: 'home.component.html',
  styleUrls: ['home.component.css'],
  entryComponents: [ChildComponent],
})
export class HomeComponent {
  @ViewChild(HomeDirective) homeDirective: HomeDirective;
  constructor(private _homeService: HomeService) {
  }
  openChild() {
    this.homeDirective.openComp(ChildComponent);
  }
}

有人能帮我吗？我是angular 2和typescript的新手。我的密码可能错了。如果我的密码错了，请纠正我

PS：尽管typescript抛出了这个错误，但这段代码按照我的要求工作（在开发版本中）。但是不能做prod-build

谢谢

您可以写：

(<ChildComponent>componentRef.instance).close.subscribe

（componentRef.instance）.close.subscribe

或

（componentRef.instance）.close.subscribe

(<any>componentRef.instance).close.subscribe