text: import { async } from '../scheduler/async';
  import { timeoutWith as higherOrder } from '../operators/timeoutWith';
  /* tslint:enable:max-line-length */
  /**
   *
   * Errors if Observable does not emit a value in given time span, in case of which
   * subscribes to the second Observable.
   *
   * <span class="informal">It's a version of `timeout` operator that let's you specify fallback Observable.</span>
   *
   * <img src="./img/timeoutWith.png" width="100%">
   *
   * `timeoutWith` is a variation of `timeout` operator. It behaves exactly the same,
   * still accepting as a first argument either a number or a Date, which control - respectively -
   * when values of source Observable should be emitted or when it should complete.
   *
   * The only difference is that it accepts a second, required parameter. This parameter
   * should be an Observable which will be subscribed when source Observable fails any timeout check.
   * So whenever regular `timeout` would emit an error, `timeoutWith` will instead start re-emitting
   * values from second Observable. Note that this fallback Observable is not checked for timeouts
   * itself, so it can emit values and complete at arbitrary points in time. From the moment of a second
   * subscription, Observable returned from `timeoutWith` simply mirrors fallback stream. When that
   * stream completes, it completes as well.
   *
   * Scheduler, which in case of `timeout` is provided as as second argument, can be still provided
   * here - as a third, optional parameter. It still is used to schedule timeout checks and -
   * as a consequence - when second Observable will be subscribed, since subscription happens
   * immediately after failing check.
   *
   * @example <caption>Add fallback observable</caption>
   * const seconds = Rx.Observable.interval(1000);
   * const minutes = Rx.Observable.interval(60 * 1000);
   *
   * seconds.timeoutWith(900, minutes)
   *     .subscribe(
   *         value => console.log(value), // After 900ms, will start emitting `minutes`,
   *                                      // since first value of `seconds` will not arrive fast enough.
   *         err => console.log(err) // Would be called after 900ms in case of `timeout`,
   *                                 // but here will never be called.
   *     );
   *
   * @param {number|Date} due Number specifying period within which Observable must emit values
   *                          or Date specifying before when Observable should complete
   * @param {Observable<T>} withObservable Observable which will be subscribed if source fails timeout check.
   * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.
   * @return {Observable<T>} Observable that mirrors behaviour of source or, when timeout check fails, of an Observable
   *                          passed as a second parameter.
   * @method timeoutWith
   * @owner Observable
   */
  export function timeoutWith(due, withObservable, scheduler = async) {
      return higherOrder(due, withObservable, scheduler)(this);
  }
  //# sourceMappingURL=timeoutWith.js.map