网页包和TypeScript上的信号器:找不到模块'./NodeHttpClient'

Package.json是

{
  "private": true,
  "version": "0.0.0",
  "scripts": {
    "test": "karma start ClientApp/test/karma.conf.js"
  },
  "devDependencies" " { ... }
  "dependencies": {
    "@aspnet/signalr": "^1.1.0"
  }
}

类型脚本代码为:

import { HubConnectionBuilder } from '@aspnet/signalr';

@Component({
    selector: 'stream-details',
    templateUrl: './stream-details.component.html'
})
export class StreamDetailsComponent implements OnInit {
    @Input() summary: any;

constructor(private deviceService: StreamService) {
}

ngOnInit() {

    let connection = new HubConnectionBuilder()
        .withUrl('/streamingHub')
        .build()

    connection
        .start()
        .then(() => connection.stream('SubscribeToStream', 'stream123'));
}
}

应用程序运行时,错误为:

NodeInvocationException:预呈现失败,原因是错误:错误:找不到模块“”/NodeHttpClient'

为什么不包括这个NodeHttpClient.js文件?我错过了什么?