Angular js 2 'node_modules/rxjs/Observable"' has no exported member 'Observable'. import Observable : <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>
