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It behaves exactly the same,\n * still accepting as a first argument either a number or a Date, which control - respectively -\n * when values of source Observable should be emitted or when it should complete.\n *\n * The only difference is that it accepts a second, required parameter. This parameter\n * should be an Observable which will be subscribed when source Observable fails any timeout check.\n * So whenever regular `timeout` would emit an error, `timeoutWith` will instead start re-emitting\n * values from second Observable. Note that this fallback Observable is not checked for timeouts\n * itself, so it can emit values and complete at arbitrary points in time. From the moment of a second\n * subscription, Observable returned from `timeoutWith` simply mirrors fallback stream. When that\n * stream completes, it completes as well.\n *\n * Scheduler, which in case of `timeout` is provided as as second argument, can be still provided\n * here - as a third, optional parameter. It still is used to schedule timeout checks and -\n * as a consequence - when second Observable will be subscribed, since subscription happens\n * immediately after failing check.\n *\n * @example <caption>Add fallback observable</caption>\n * const seconds = Rx.Observable.interval(1000);\n * const minutes = Rx.Observable.interval(60 * 1000);\n *\n * seconds.timeoutWith(900, minutes)\n *     .subscribe(\n *         value => console.log(value), // After 900ms, will start emitting `minutes`,\n *                                      // since first value of `seconds` will not arrive fast enough.\n *         err => console.log(err) // Would be called after 900ms in case of `timeout`,\n *                                 // but here will never be called.\n *     );\n *\n * @param {number|Date} due Number specifying period within which Observable must emit values\n *                          or Date specifying before when Observable should complete\n * @param {Observable<T>} withObservable Observable which will be subscribed if source fails timeout check.\n * @param {Scheduler} [scheduler] Scheduler controlling when timeout checks occur.\n * @return {Observable<T>} Observable that mirrors behaviour of source or, when timeout check fails, of an Observable\n *                          passed as a second parameter.\n * @method timeoutWith\n * @owner Observable\n */\nexport function timeoutWith<T, R>(due: number | Date,\n                                  withObservable: ObservableInput<R>,\n                                  scheduler: IScheduler = async): OperatorFunction<T, T | R> {\n  return (source: Observable<T>) => {\n    let absoluteTimeout = isDate(due);\n    let waitFor = absoluteTimeout ? (+due - scheduler.now()) : Math.abs(<number>due);\n    return source.lift(new TimeoutWithOperator(waitFor, absoluteTimeout, withObservable, scheduler));\n  };\n}\n\nclass TimeoutWithOperator<T> implements Operator<T, T> {\n  constructor(private waitFor: number,\n              private absoluteTimeout: boolean,\n              private withObservable: ObservableInput<any>,\n              private scheduler: IScheduler) {\n  }\n\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return source.subscribe(new TimeoutWithSubscriber(\n      subscriber, this.absoluteTimeout, this.waitFor, this.withObservable, this.scheduler\n    ));\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass TimeoutWithSubscriber<T, R> extends OuterSubscriber<T, R> {\n\n  private action: Action<TimeoutWithSubscriber<T, R>> = null;\n\n  constructor(destination: Subscriber<T>,\n              private absoluteTimeout: boolean,\n              private waitFor: number,\n              private withObservable: ObservableInput<any>,\n              private scheduler: IScheduler) {\n    super(destination);\n    this.scheduleTimeout();\n  }\n\n  private static dispatchTimeout<T, R>(subscriber: TimeoutWithSubscriber<T, R>): void {\n    const { withObservable } = subscriber;\n    (<any> subscriber)._unsubscribeAndRecycle();\n    subscriber.add(subscribeToResult(subscriber, withObservable));\n  }\n\n  private scheduleTimeout(): void {\n    const { action } = this;\n    if (action) {\n      // Recycle the action if we've already scheduled one. All the production\n      // Scheduler Actions mutate their state/delay time and return themeselves.\n      // VirtualActions are immutable, so they create and return a clone. In this\n      // case, we need to set the action reference to the most recent VirtualAction,\n      // to ensure that's the one we clone from next time.\n      this.action = (<Action<TimeoutWithSubscriber<T, R>>> action.schedule(this, this.waitFor));\n    } else {\n      this.add(this.action = (<Action<TimeoutWithSubscriber<T, R>>> this.scheduler.schedule(\n        TimeoutWithSubscriber.dispatchTimeout, this.waitFor, this\n      )));\n    }\n  }\n\n  protected _next(value: T): void {\n    if (!this.absoluteTimeout) {\n      this.scheduleTimeout();\n    }\n    super._next(value);\n  }\n\n  /** @deprecated internal use only */ _unsubscribe() {\n    this.action = null;\n    this.scheduler = null;\n    this.withObservable = null;\n  }\n}\n"]}