Redux Form Async Validation

AsyncValidation.js

export default reduxForm({
  form: 'signIn',
  asyncValidate: (values) => {
    return new Promise((resolve, reject) => {
      // simulate request
      setTimeout(() => { 
        if (values.email.indexOf('@gmail.com') === -1) {
          reject({ email: 'Only mails at gmail are allowed' });
        } else {
          resolve();
        }
      }, 1000);
    });
  },
  asyncBlurFields: ['email'],
  shouldAsyncValidate: (params) => {
    return params.trigger === 'blur' && params.syncValidationPasses; // do not async validate on submit
  }
})(MyForm);