How to cancel timeout inside of Javascript Promise?

Question

I\'m toying with promises in JavaScript and tried to promisify setTimeout function:

function timeout(ms) {
  return new Promise(function(resolve, reject) {
          


        

Answer 1

This is my answer in TypeScript:

  private sleep(ms) {
    let timerId, endTimer;
    class TimedPromise extends Promise {
      isCanceled: boolean = false;
      cancel = () => {
        endTimer();
        clearTimeout(timerId);
        this.isCanceled = true;
      };
      constructor(fn) {
        super(fn);
      }
    }
    return new TimedPromise(resolve => {
      endTimer = resolve;
      timerId = setTimeout(endTimer, ms);
    });
  }

Usage:

const wait = sleep(10*1000);
setTimeout(() => { wait.cancel() },5 * 1000);
await wait;