Redux Middleware for making requests

redux-request-middleware.js

const createRequestMiddleware = baseUrl => ({ dispatch }) => next => action => {
  if (action.type !== 'api') {
    return next(action)
  }

  const url = `${baseUrl}${action.url}`;
  return fetch(url)
    .then(res => res.json())
    .then(data => action.success(dispatch, data))
}