initial commit: scaffolding

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diff --git a/node_modules/rxjs/src/internal/operators/sampleTime.ts b/node_modules/rxjs/src/internal/operators/sampleTime.ts
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+import { asyncScheduler } from '../scheduler/async';
+import { MonoTypeOperatorFunction, SchedulerLike } from '../types';
+import { sample } from './sample';
+import { interval } from '../observable/interval';
+
+/**
+ * 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>
+ *
+ * ![](sampleTime.png)
+ *
+ * `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
+ *
+ * Every second, emit the most recent click at most once
+ *
+ * ```ts
+ * import { fromEvent, sampleTime } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const result = clicks.pipe(sampleTime(1000));
+ *
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link auditTime}
+ * @see {@link debounceTime}
+ * @see {@link delay}
+ * @see {@link sample}
+ * @see {@link throttleTime}
+ *
+ * @param period The sampling period expressed in milliseconds or the time unit
+ * determined internally by the optional `scheduler`.
+ * @param scheduler The {@link SchedulerLike} to use for managing the timers
+ * that handle the sampling.
+ * @return A function that returns an Observable that emits the results of
+ * sampling the values emitted by the source Observable at the specified time
+ * interval.
+ */
+export function sampleTime<T>(period: number, scheduler: SchedulerLike = asyncScheduler): MonoTypeOperatorFunction<T> {
+  return sample(interval(period, scheduler));
+}