Promise cancellation with bluebird 3.x

bluebird-promise-cancellation.js

const Promise = require('bluebird');

Promise.config({
  cancellation: true
});

const TIME_TO_WAIT_FOR_PROMISE = 1000;

const delayedPromise = new Promise((resolve, reject) =>
  setTimeout(() => {
    if (delayedPromise.isCancelled()) return;
    const message = 'I will throw an Error if nobody cancels me.';
    const error = new Error(message);
    console.error(error.message);
    reject(error);
  }, TIME_TO_WAIT_FOR_PROMISE)
);

delayedPromise.cancel(); // If this line gets removed, the program will fail.