createUser.js

export default ({ validateUser, userRepository }) => async (userData, { onSuccess, onError, onValidationError }) => {
  if(!validateUser(userData)) {
    return onValidationError(new Error('Invalid user'));
  }
  
  try {
    const user = await userRepository.add(userData);
    onSuccess(user);
    
  } catch(error) {
    onError(error);
  }
};

userActions.js

const createUserAction = (userData) => (dispatch, getState, container) => {
  container.createUser(userData, {
    // notice that we don't add conditionals to emit any of these actions
    onSuccess: (user) => dispatch(createUserSuccessAction(user)),
    onError: (error) => dispatch(createUserErrorAction(error)),
    onValidationError: (error) => dispatch(createUserValidationErrorAction(error))
  });
};