Run promise all with limit how many task can run in concurrence

promiseAllLimit.ts

export async function promiseAllLimit<T>(n: number, list: (() => Promise<T>)[]) {
  const head = list.slice(0, n);
  const tail = list.slice(n);
  const result: T[] = [];
  const execute = async (promise: () => Promise<T>, i: number, runNext: () => Promise<void>) => {
    result[i] = await promise();
    await runNext();
  };
  const runNext = async () => {
    const i = list.length - tail.length;
    const promise = tail.shift();
    if (promise !== undefined) {
      await execute(promise, i, runNext);
    }
  };
  await Promise.all(head.map((promise, i) => execute(promise, i, runNext)));
  return result;
}