// Action creator function
function fetchArticles(params = {}) {
  return dispatch => {
    dispatch({ type: 'FETCH_ARTICLES_START', params });
    ArticlesService.getArticles(params).then(
      response => {
        dispatch({
          type: 'FETCH_ARTICLES_SUCCESS',
          data: response.data
        });
      },
      error => {
        dispatch({ type: 'FETCH_ARTICLES_FAILURE', error });
      }
    );
  };
}

// Configuration
const store = createStore(
  reducer,
  applyMiddleware(thunk)
);

// Usage
dispatch(fetchArticles());