Function to wait until condition is met before resolving promise

promiseWhen.js

export default function promiseWhen(condition, timeout = 2000) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject();
    }, timeout);

    const loop = () => {
      if (condition()) {
        return resolve();
      }
      setTimeout(loop, 0);
    };

    setTimeout(loop, 0);

  });

}