code: function sampleTime(period, scheduler) {
  	    if (scheduler === void 0) { scheduler = async_1.async; }
  	    return this.lift(new SampleTimeOperator(period, scheduler));
  	}
docs: Emits the most recently emitted value from the source Observable within
  periodic time intervals.
  
  <span class="informal">Samples the source Observable at periodic time
  intervals, emitting what it samples.</span>
  
  <img src="./img/sampleTime.png" width="100%">
  
  `sampleTime` periodically looks at the source Observable and emits whichever
  value it has most recently emitted since the previous sampling, unless the
  source has not emitted anything since the previous sampling. The sampling
  happens periodically in time every `period` milliseconds (or the time unit
  defined by the optional `scheduler` argument). The sampling starts as soon as
  the output Observable is subscribed.
  
  @example <caption>Every second, emit the most recent click at most once</caption>
  var clicks = Rx.Observable.fromEvent(document, 'click');
  var result = clicks.sampleTime(1000);
  result.subscribe(x => console.log(x));
  
  @see {@link auditTime}
  @see {@link debounceTime}
  @see {@link delay}
  @see {@link sample}
  @see {@link throttleTime}
  
  @param {number} period The sampling period expressed in milliseconds or the
  time unit determined internally by the optional `scheduler`.
  @param {Scheduler} [scheduler=async] The {@link Scheduler} to use for
  managing the timers that handle the sampling.
  @return {Observable<T>} An Observable that emits the results of sampling the
  values emitted by the source Observable at the specified time interval.
  @method sampleTime
  @owner Observable