text: import { combineReducers } from 'redux';
  import auth_reducer from './reducer/auth.js';
  import small_nav from './reducer/nav.js';
  import window_size from './reducer/window.js';
  
  const root_reducer = combineReducers({
     auth: auth_reducer,
     nav: small_nav,
     win: window_size
  });
  
  export default root_reducer;