Coroutine runner in JavaScript

coroutine-runner.js

const coroutine = nextValue => iterator => {
  const { done, value } = iterator.next(nextValue);

  if (done) {
    return;
  }

  if (value.constructor === Promise) {
    value.then(promiseValue => {
      coroutine(promiseValue)(iterator);
    });
  } else {
    coroutine(value)(iterator);
  }
};

// to see a working example: https://gist.github.com/adambene/b3de67803e634be8f7d6baa273b5f447