axax/esnext/throttle.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Throttles an async iterator. Emits a value and then prevents emits until timer has completed.
 */
function throttle(timer) {
    return async function* inner(source) {
        let pendingTimerPromise = null;
        for await (const item of source) {
            if (!pendingTimerPromise) {
                yield item;
                pendingTimerPromise = timer(item).then(() => {
                    pendingTimerPromise = null;
                });
            }
        }
    };
}
exports.throttle = throttle;