container.js

import api from './infra/api'; // has no dependencies
import { validateUser } from './domain/user'; // has no dependencies
import makeUserRepository from './infra/user/userRepository';
import makeArticleRepository from './infra/article/articleRepository';
import makeCreateUser from './app/user/createUser';
import makeGetArticle from './app/article/getArticle';

const userRepository = makeUserRepository({
  api
});

const articleRepository = makeArticleRepository({
  api
});

const createUser = makeCreateUser({
  userRepository,
  validateUser
});

const getArticle = makeGetArticle({
  userRepository,
  articleRepository
});

export {
  createUser,
  getArticle
};

createUser.js

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

userRepository.js

export default ({ api }) => ({
  async add(userData) {
    const user = await api.post('/users', userData);
    
    return user;
  }
});