gistfile1.js

export default () => next => action => {
  const callAPI = action[CALL_API];
  if (typeof callAPI === 'undefined') {
    return next(action);
  }
  const { url, types } = callAPI;
  // const url = action.url;
  // const types = action.types;
  const [requestType, successType, failureType] = types;

  if (typeof callAPI === 'undefined') {
    return next(action);
  }

  function actionWith(data) {
    const finalAction = Object.assign({}, action, data);
    delete finalAction[CALL_API];
    return finalAction;
  }

  next(actionWith({ type: requestType }));

  return axios.get(url).then(
    (response) => {
      // normalize your response
      const normalizedResponse = response.body;
      return next(actionWith({
        normalizedResponse,
        type: successType,
      }));
    }
  ).catch(
    (error) => {
      // do something with your error
      return next(actionWith({
        type: failureType,
        error: error.message || 'Something bad happened',
      }));
    }
  );
};