function simonSays(speech: string, callback: Function) {
  callback(undefined, speech);
}

function promisedSimonSays(speech: string): Promise<string> {
  return new Promise((resolve, reject) => {
    simonSays(speech, (err: any, result: any) => {
      if (err) {
        reject(err);
      } else {
        resolve(result);
      }
    });
  });
}