breaking a long running Promise, because it runs too long.

prematurePromiseRejection.js

var test = new Promise((resolve, reject) => {
  var longReject;
  var LONG = new Promise((resolve, reject) => {
    longReject = reject;
    setTimeout(() => resolve(), 5000)
  })
    .then(() => console.log('LONG: resolved after 5 seconds'))
    .catch(() => console.warn('LONG: rejected!'))

  setTimeout(() => {
    reject('running too long')
    longReject();
  }, 2000)
})
  .then(() => console.log('test: resolved finally'))
  .catch((reason) => console.warn('test: rejected! reason:', reason))