ES6中增强的对象文字，反应不起作用

Question

我正在尝试在我的redux reducer中使用增强的对象文字语法，其中一些正在工作，而其他人返回空对象。有没有理由为什么＆＃39;形成＆＃39;和＆＃39; auth＆＃39;在我的例子中工作正常，但＆＃39;文件＆＃39;才不是？当我更改文件时＃39;对于传统的语法，它工作得很好。当我执行下面的例子时，它只返回一个空对象

import { combineReducers } from 'redux';
import auth from './auth_reducer';
import userReducer from './user_reducer';
import propertyReducer from './property_reducer';
import files from './file_upload_reducer';
import { reducer as form } from 'redux-form';


const appReducer = combineReducers({
  /* your app’s top-level reducers */
  form,
  auth,
  user: userReducer,
  properties: propertyReducer,
  files
})

const rootReducer = (state, action) => {
  if (action.type === 'UNAUTH_USER') {
    state = undefined
  }

  return appReducer(state, action)
}

export default rootReducer;