const queue = new ConcurrentQueue({
  maxConcurrency: 2
});

let delay = (ms: number) =>
  new Promise((resolve) => setTimeout(() => resolve(true), ms));

let log = async (ms: number, msg: string) => {
  await delay(ms);
  console.log(msg);
  return msg;
};

let tasks: Task<String>[] = [
  async () => log(2000, "I'm (even later) task #1!"),
  async () => log(1000, "I'm (late) task #2!"),
  async () => log(300, "I'm task #3!"),
  async () => log(400, "I'm task #4!"),
  async () => log(200, "I'm task #5!"),
  async () => log(500, "I'm task #6!"),
  async () => log(50, "I'm task #7!"),
  async () => log(1, "I'm task #8!")
];

let results = await queue.run(tasks);
console.log("Results: ", results);