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authorPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
committerPinapelz <yukais@pinapelz.com>2025-06-29 11:49:28 -0700
commitd55b767039605256c736166a942a9138e3eacfd7 (patch)
tree947063b634c50d438a794325f13275e134aa5993 /node_modules/rxjs/src/internal/operators/debounceTime.ts
parent864ce67d89c77d8ef9c3361f80d619853abcf91c (diff)
remove dev node_modules (oops)
Diffstat (limited to 'node_modules/rxjs/src/internal/operators/debounceTime.ts')
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-import { asyncScheduler } from '../scheduler/async';
-import { Subscription } from '../Subscription';
-import { MonoTypeOperatorFunction, SchedulerAction, SchedulerLike } from '../types';
-import { operate } from '../util/lift';
-import { createOperatorSubscriber } from './OperatorSubscriber';
-
-/**
- * Emits a notification from the source Observable only after a particular time span
- * has passed without another source emission.
- *
- * <span class="informal">It's like {@link delay}, but passes only the most
- * recent notification from each burst of emissions.</span>
- *
- * ![](debounceTime.png)
- *
- * `debounceTime` delays notifications emitted by the source Observable, but drops
- * previous pending delayed emissions if a new notification arrives on the source
- * Observable. This operator keeps track of the most recent notification from the
- * source Observable, and emits that only when `dueTime` has passed
- * without any other notification appearing on the source Observable. If a new value
- * appears before `dueTime` silence occurs, the previous notification will be dropped
- * and will not be emitted and a new `dueTime` is scheduled.
- * If the completing event happens during `dueTime` the last cached notification
- * is emitted before the completion event is forwarded to the output observable.
- * If the error event happens during `dueTime` or after it only the error event is
- * forwarded to the output observable. The cache notification is not emitted in this case.
- *
- * This is a rate-limiting operator, because it is impossible for more than one
- * notification to be emitted in any time window of duration `dueTime`, but it is also
- * a delay-like operator since output emissions do not occur at the same time as
- * they did on the source Observable. Optionally takes a {@link SchedulerLike} for
- * managing timers.
- *
- * ## Example
- *
- * Emit the most recent click after a burst of clicks
- *
- * ```ts
- * import { fromEvent, debounceTime } from 'rxjs';
- *
- * const clicks = fromEvent(document, 'click');
- * const result = clicks.pipe(debounceTime(1000));
- * result.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link audit}
- * @see {@link auditTime}
- * @see {@link debounce}
- * @see {@link sample}
- * @see {@link sampleTime}
- * @see {@link throttle}
- * @see {@link throttleTime}
- *
- * @param dueTime The timeout duration in milliseconds (or the time unit determined
- * internally by the optional `scheduler`) for the window of time required to wait
- * for emission silence before emitting the most recent source value.
- * @param scheduler The {@link SchedulerLike} to use for managing the timers that
- * handle the timeout for each value.
- * @return A function that returns an Observable that delays the emissions of
- * the source Observable by the specified `dueTime`, and may drop some values
- * if they occur too frequently.
- */
-export function debounceTime<T>(dueTime: number, scheduler: SchedulerLike = asyncScheduler): MonoTypeOperatorFunction<T> {
- return operate((source, subscriber) => {
- let activeTask: Subscription | null = null;
- let lastValue: T | null = null;
- let lastTime: number | null = null;
-
- const emit = () => {
- if (activeTask) {
- // We have a value! Free up memory first, then emit the value.
- activeTask.unsubscribe();
- activeTask = null;
- const value = lastValue!;
- lastValue = null;
- subscriber.next(value);
- }
- };
- function emitWhenIdle(this: SchedulerAction<unknown>) {
- // This is called `dueTime` after the first value
- // but we might have received new values during this window!
-
- const targetTime = lastTime! + dueTime;
- const now = scheduler.now();
- if (now < targetTime) {
- // On that case, re-schedule to the new target
- activeTask = this.schedule(undefined, targetTime - now);
- subscriber.add(activeTask);
- return;
- }
-
- emit();
- }
-
- source.subscribe(
- createOperatorSubscriber(
- subscriber,
- (value: T) => {
- lastValue = value;
- lastTime = scheduler.now();
-
- // Only set up a task if it's not already up
- if (!activeTask) {
- activeTask = scheduler.schedule(emitWhenIdle, dueTime);
- subscriber.add(activeTask);
- }
- },
- () => {
- // Source completed.
- // Emit any pending debounced values then complete
- emit();
- subscriber.complete();
- },
- // Pass all errors through to consumer.
- undefined,
- () => {
- // Finalization.
- lastValue = activeTask = null;
- }
- )
- );
- });
-}
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