@reactivex/rxjs/src/add/operator/subscribeOn.ts

Reactive Extensions for modern JavaScript

import {Observable} from '../../Observable';
import {subscribeOn, SubscribeOnSignature} from '../../operator/subscribeOn';

Observable.prototype.subscribeOn = subscribeOn;

declare module '../../Observable' {
  interface Observable<T> {
    subscribeOn: SubscribeOnSignature<T>;
  }
}