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  1. import { asyncScheduler } from '../scheduler/async';
  2. import { audit } from './audit';
  3. import { timer } from '../observable/timer';
  4. import { MonoTypeOperatorFunction, SchedulerLike } from '../types';
  5. /**
  6. * Ignores source values for `duration` milliseconds, then emits the most recent
  7. * value from the source Observable, then repeats this process.
  8. *
  9. * <span class="informal">When it sees a source value, it ignores that plus
  10. * the next ones for `duration` milliseconds, and then it emits the most recent
  11. * value from the source.</span>
  12. *
  13. * ![](auditTime.png)
  14. *
  15. * `auditTime` is similar to `throttleTime`, but emits the last value from the
  16. * silenced time window, instead of the first value. `auditTime` emits the most
  17. * recent value from the source Observable on the output Observable as soon as
  18. * its internal timer becomes disabled, and ignores source values while the
  19. * timer is enabled. Initially, the timer is disabled. As soon as the first
  20. * source value arrives, the timer is enabled. After `duration` milliseconds (or
  21. * the time unit determined internally by the optional `scheduler`) has passed,
  22. * the timer is disabled, then the most recent source value is emitted on the
  23. * output Observable, and this process repeats for the next source value.
  24. * Optionally takes a {@link SchedulerLike} for managing timers.
  25. *
  26. * ## Example
  27. *
  28. * Emit clicks at a rate of at most one click per second
  29. *
  30. * ```ts
  31. * import { fromEvent, auditTime } from 'rxjs';
  32. *
  33. * const clicks = fromEvent(document, 'click');
  34. * const result = clicks.pipe(auditTime(1000));
  35. * result.subscribe(x => console.log(x));
  36. * ```
  37. *
  38. * @see {@link audit}
  39. * @see {@link debounceTime}
  40. * @see {@link delay}
  41. * @see {@link sampleTime}
  42. * @see {@link throttleTime}
  43. *
  44. * @param duration Time to wait before emitting the most recent source value,
  45. * measured in milliseconds or the time unit determined internally by the
  46. * optional `scheduler`.
  47. * @param scheduler The {@link SchedulerLike} to use for managing the timers
  48. * that handle the rate-limiting behavior.
  49. * @return A function that returns an Observable that performs rate-limiting of
  50. * emissions from the source Observable.
  51. */
  52. export function auditTime<T>(duration: number, scheduler: SchedulerLike = asyncScheduler): MonoTypeOperatorFunction<T> {
  53. return audit(() => timer(duration, scheduler));
  54. }