import { Subject } from "rxjs/Subject";
import { of } from "rxjs/observable/of";

const subject = new Subject<any>();
const observable = of([1, 2]);
observable.subscribe();
           ~~~~~~~~~                                [no-ignored-subscribe]
observable.subscribe(value => console.log(value));

subject.subscribe();
        ~~~~~~~~~                                   [no-ignored-subscribe]
subject.subscribe(value => console.log(value));

[no-ignored-subscribe]: Calling subscribe without arguments is forbidden