computeIntensiveRunner.js

computeIntensiveRunner.js

const {promisify} = require('util')
const crypto = require('crypto')

function randomString() {
  return crypto.randomBytes(100).toString('hex');
}

function* computeIntensiveCode() {
  const hash = crypto.createHash('sha256');
  for (let i=0; i < 100; i++) {
    hash.update(randomString())
    yield
  }

  return hash.digest('hex')
}

async function computeIntensiveRunner(generator) {

  for(;;) {
    const {done, value} = generator.next()
    if (done) {
      return value
    }

    await promisify(setImmediate)()
  }
}

computeIntensiveRunner(computeIntensiveCode()).then(console.log)