try-catch-username-checl.js

try {
  validateUsernameFormat(user.username);
  await checkUsernameExists(user.username);
} catch (error) {
  return {
    // a better approach is to have a response success/error function
    error: {
      message: error.message,
      code: 'FAILED_USERNAME_VALIDATION',
    }
  }
}