Type ‘Observable’ is not assignable to type ‘Observable’

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There are two ways to do this, and it depends on which version of RxJS / Angular that you are using. Here are the two ways to do it depending on your versions:

// Using RxJS v4 / Angular v2-4. I assume that you're using the HttpModule...
import 'rxjs/add/operator/map';

public getUsers(url: string): Observable<IUser[]> {
  return this._http.get(url)
    .map((response: Response) => <IUser[]>response.json());
}


// Using RxJS v5 / Angular 5+ (at the moment). I assume that you're using the HttpClientModule, as the HttpModule was deprecated in Angular v4.
public getUsers(url: string): Observable<IUser[]> {
  return this._http.get<IUser[]>(url);
}

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