@altano/tiny-async-pool/dist/doWorkAndYield.js

Run multiple promise-returning & async functions with limited concurrency using native ES9

//#region src/doWorkAndYield.ts
/**
* Process items from `iterable` in batches and yield the result of each call to
* `iteratorFn`
*/
async function* doWorkAndYield(concurrentCount, iterable, iteratorFn) {
	const executing = new Set();
	async function consume() {
		const [promise, value] = await Promise.race(executing);
		executing.delete(promise);
		return value;
	}
	for (const item of iterable) {
		const result = iteratorFn(item, iterable);
		const promise = result.then((value) => [promise, value]);
		executing.add(promise);
		if (executing.size >= concurrentCount) yield await consume();
	}
	while (executing.size) yield await consume();
}

//#endregion
export { doWorkAndYield };
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