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

const subject = new Subject<any>();
const observable = of([1, 2]);
const next = () => {};

observable.subscribe(() => {}, () => {});
observable.subscribe(() => {});
           ~~~~~~~~~                        [no-ignored-error]
observable.subscribe(next);
           ~~~~~~~~~                        [no-ignored-error]
observable.subscribe(subject);

subject.subscribe(() => {});
        ~~~~~~~~~                           [no-ignored-error]
subject.subscribe(next);
        ~~~~~~~~~                           [no-ignored-error]

[no-ignored-error]: Calling subscribe without an error handler is forbidden