text: import { fromJS } from 'immutable';
  import {
      UPDATE_NEWS_LIST,
  } from '../_constants/ActionTypes';
  
  
  const initialState = fromJS([]);
  
  export default (state = initialState, action) => {
      switch (action.type) {
          case UPDATE_NEWS_LIST: {
              return state.merge(action.articles);
          }
          default :
              return state;
      }
  };
  