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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"]}
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