title: Angular js 2 'node_modules/rxjs/Observable"' has no exported member 'Observable'. import Observable
body: <p>I am Getting below Error in Auth.d.ts file in Node_Modules Package.</p>
  
  <p>[ts] Module 'node_modules/rxjs/Observable"' has no exported member 'Observable'.
  import Observable</p>
  
  <p>Find the below code for Auth.d.ts file :</p>
  
  <pre><code>import * as firebase from 'firebase/app';
  import 'firebase/auth';
  
  import { Observable } from 'rxjs/Observable';
  import { FirebaseApp } from '../app/index';
  export declare class AngularFireAuth {
      app: FirebaseApp;
      auth: firebase.auth.Auth;
      authState: Observable&lt;firebase.User&gt;;
      idToken: Observable&lt;firebase.User&gt;;
      constructor(app: FirebaseApp);
  }
  export declare function FirebaseAuthStateObservable(app: FirebaseApp): Observable&lt;firebase.User&gt;;
  export declare function FirebaseIdTokenObservable(app: FirebaseApp): Observable&lt;firebase.User&gt;;
  </code></pre>
  
  <p>I installed  "npm install @reactivex/rxjs" this package also even then I am getting above error</p>