在viewer.component.ts中

//Other Imports
    import { Observable } from 'rxjs/Observable';
    //omitting for brevity
   export class ViewerComponent implements OnInit,AfterViewInit,OnDestroy {
    someFunction(someArg){
    //omitting for brevity
    let someArray: any = [];
    //Add some info
    Observable.forkJoin(someArray).subscribe(data => {
              //Do something with data
            });
    }
    //omitting for brevity
    }

我得到了错误

ERROR TypeError: __WEBPACK_IMPORTED_MODULE_2_rxjs_Observable__.Observable.forkJoin is not a function
    at ViewerComponent.webpackJsonp../src/app/component/viewer.component.ts.ViewerComponent.someFunction(http://localhost:4200/main.bundle.js:4022:73)
    at http://localhost:4200/main.bundle.js:3951:31

但如果我完全导入Rxjs(导入’rxjs’;)一切正常.没错.
我似乎已经了解了所需的其他内容.
我也尝试导入rxjs / Observable / forkjoin,但没什么可用的.

关于如何解决这个问题的任何指示.