Promises that time out

index.js

// A higher order function that makes a promise time out after X ms
const timeoutAfter = ms => promise => {
  const rejectOnTimeout = new Promise((resolve, reject) =>
    setTimeout(() => reject(new Error(`Timed out after ${ms} ms waiting for promise to resolve`)), ms)
  )

  return Promise.race([promise, rejectOnTimeout])
}

// Here's how you use it
const myLoooongPromise = new Promise((resolve, reject) =>
  setTimeout(() => resolve('Finally doneeee!'), 1000000000)
)

timeoutAfter(500)(myLoooongPromise)
  .then(console.log)
  .catch(console.error)