import { Observable } from 'rxjs';
import { ignoreElements as higherOrder } from 'rxjs/operators';

/**
 * Ignores all items emitted by the source Observable and only passes calls of `complete` or `error`.
 *
 * <img src="./img/ignoreElements.png" width="100%">
 *
 * @return {Observable} An empty Observable that only calls `complete`
 * or `error`, based on which one is called by the source Observable.
 * @method ignoreElements
 * @owner Observable
 */
export function ignoreElements(this: Observable<any>): Observable<never> {
  return higherOrder()(this);
}