@johngw/stream/dist/transformers/sampleTime.js

Reactive programming tools using the WHATWG Streams API.

/**
 * Streams the latest chunk in intervals of `ms`.
 *
 * @group Transformers
 * @example
 * ```
 * --1--T40----2--T20--|
 * sampleTime(20)
 * -T20-1-T20-1-T20-2--|
 * ```
 */
export function sampleTime(ms) {
    let buffer;
    let interval;
    let hasSample = false;
    return new TransformStream({
        start(controller) {
            interval = setInterval(() => {
                if (hasSample)
                    controller.enqueue(buffer);
            }, ms);
        },
        transform(chunk) {
            hasSample = true;
            buffer = chunk;
        },
        flush() {
            clearInterval(interval);
        },
        cancel() {
            clearInterval(interval);
        },
    });
}
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