text: import { combineReducers } from 'redux';
  import searchHistory from './search_history';
  import searchStatus from './search_status';
  import searchResults from './search_results';
  import searchKeyword from './search_keyword';
  import playlist from './playlist';
  import playIndex from './play_index';
  
  export default combineReducers({
    // key: state name, value: state value
    providers: () => ['netease', 'qq', 'kuwo'],
    searchHistory,
    searchStatus,
    searchResults,
    searchKeyword,
    playlist,
    playIndex,
  });
  