NodeJS 7: EventEmitter + await/async

Question

How we can end an async function from a callback passed to an event emitter without promisifing the event emitter?

Also without using <

Answer 1

Can we end an async function from a callback passed to an event emitter without promisifing the event emitter?

No. async/await syntax is just sugar for then calls and relies on promises.

async function bakeMeSomeBurgers () {
  let canIHave = await canIHazACheezBurger();
  if (canIHave)
    console.log('Hehe, you can have...');
  else
    console.log('NOPE');

  // Here we create and await our promise:
  await new Promise((resolve, reject) => {
    // Here invoke our event emitter:
    let cook = new BurgerCooking('cheez');
    // a normal event callback:
    cook.on('update', percent => {
      console.log(`The burger is ${percent}% done`);
    });
    cook.on('end', resolve); // call resolve when its done
    cook.on('error', reject); // don't forget this
  });

  console.log('I\'ve finished the burger!');
  if (canIHave)
    console.log('Here, take it :)');
  else
    console.log('Too bad, you can\'t have it >:)');
}