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Initially, the timer is disabled. As soon as the first source\n * value arrives, it is forwarded to the output Observable, and then the timer\n * is enabled. After `duration` milliseconds (or the time unit determined\n * internally by the optional `scheduler`) has passed, the timer is disabled,\n * and this process repeats for the next source value. Optionally takes a\n * {@link IScheduler} for managing timers.\n *\n * @example <caption>Emit clicks at a rate of at most one click per second</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var result = clicks.throttleTime(1000);\n * result.subscribe(x => console.log(x));\n *\n * @see {@link auditTime}\n * @see {@link debounceTime}\n * @see {@link delay}\n * @see {@link sampleTime}\n * @see {@link throttle}\n *\n * @param {number} duration Time to wait before emitting another value after\n * emitting the last value, measured in milliseconds or the time unit determined\n * internally by the optional `scheduler`.\n * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for\n * managing the timers that handle the throttling.\n * @return {Observable<T>} An Observable that performs the throttle operation to\n * limit the rate of emissions from the source.\n * @method throttleTime\n * @owner Observable\n */\nexport function throttleTime<T>(duration: number,\n                                scheduler: IScheduler = async,\n                                config: ThrottleConfig = defaultThrottleConfig): MonoTypeOperatorFunction<T> {\n  return (source: Observable<T>) => source.lift(new ThrottleTimeOperator(duration, scheduler, config.leading, config.trailing));\n}\n\nclass ThrottleTimeOperator<T> implements Operator<T, T> {\n  constructor(private duration: number,\n              private scheduler: IScheduler,\n              private leading: boolean,\n              private trailing: boolean) {\n  }\n\n  call(subscriber: Subscriber<T>, source: any): TeardownLogic {\n    return source.subscribe(\n      new ThrottleTimeSubscriber(subscriber, this.duration, this.scheduler, this.leading, this.trailing)\n    );\n  }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass ThrottleTimeSubscriber<T> extends Subscriber<T> {\n  private throttled: Subscription;\n  private _hasTrailingValue: boolean = false;\n  private _trailingValue: T = null;\n\n  constructor(destination: Subscriber<T>,\n              private duration: number,\n              private scheduler: IScheduler,\n              private leading: boolean,\n              private trailing: boolean) {\n    super(destination);\n  }\n\n  protected _next(value: T) {\n    if (this.throttled) {\n      if (this.trailing) {\n        this._trailingValue = value;\n        this._hasTrailingValue = true;\n      }\n    } else {\n      this.add(this.throttled = this.scheduler.schedule(dispatchNext, this.duration, { subscriber: this }));\n      if (this.leading) {\n        this.destination.next(value);\n      }\n    }\n  }\n\n  clearThrottle() {\n    const throttled = this.throttled;\n    if (throttled) {\n      if (this.trailing && this._hasTrailingValue) {\n        this.destination.next(this._trailingValue);\n        this._trailingValue = null;\n        this._hasTrailingValue = false;\n      }\n      throttled.unsubscribe();\n      this.remove(throttled);\n      this.throttled = null;\n    }\n  }\n}\n\ninterface DispatchArg<T> {\n  subscriber: ThrottleTimeSubscriber<T>;\n}\n\nfunction dispatchNext<T>(arg: DispatchArg<T>) {\n  const { subscriber } = arg;\n  subscriber.clearThrottle();\n}\n"]}