@johngw/stream/dist/transformers/debounce/LeadingBehavior.js

Reactive programming tools using the WHATWG Streams API.

/**
 * Debouncing behavior to queue the leading event.
 *
 * @group Transformers
 * @see {@link debounce:function}
 * @example
 * ```
 * --a-b-c--T20-d--|
 *
 * debounce(20, new DebounceLeadingBehavior())
 *
 * --a----------d---
 * ```
 */
export class DebounceLeadingBehavior {
    preTimer(state, chunk, controller) {
        const enqueue = !state.timer && !state.queued;
        if (enqueue) {
            controller.enqueue(chunk);
            return {
                ...state,
                queued: enqueue,
            };
        }
    }
}
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