cancellableDelay.js

import Promise from 'bluebird';
Promise.config({ cancellation: true });

const cancellableDelay = (time, cancelHandler) =>
  new Promise((resolve, reject, onCancel) => {
    const timer = setTimeout(resolve, time);
    onCancel(() => {
      clearTimeout(timer);
      cancelHandler();
    });
  });

//////////////////// example ////////////////////

console.log(`start at ${new Date()}`);
const delayPromise = cancellableDelay(5000, () => {
  console.log(`cancelled at ${new Date()}`);
});

delayPromise.then(() => {
  console.log(`resolved at ${new Date()}`);
});

/*
cancel 2 seconds later.
*/
setTimeout(() => {
  delayPromise.cancel();
}, 2000);

/*
resolve 5 seconds later.
setTimeout(() => {
  delayPromise.cancel();  // no meaning
}, 6000);
*/