Redux报错Expected the root reducer to be a function排查求助

开发过程中遇到持续无法解决的报错：

未捕获错误：Expected the root reducer to be a function. Instead, received:''

已尝试所有可检索到的相关解决方案，均未生效。

相关代码片段 #

rootReducer 实现 #

import {combineReducers} from 'redux'
import changeCategoryReducer from './changeCategoryReducer'
import categoryListReducer from './categoryListReducer'
import productListReducer from './productListReducer'
import cartReducer from './cartReducer'
import saveProductReducer from './saveProductReducer'


const rootReducer = combineReducers({
   changeCategoryReducer,
    categoryListReducer,
    productListReducer,
    cartReducer,
    saveProductReducer
});

export default rootReducer;

configureStore 配置 #

import {createStore, applyMiddleware} from 'redux'
import * as rootReducer from './index.js'
import thunk from 'redux-thunk'

export default function configureStore(){
    return createStore(rootReducer, applyMiddleware(thunk))
}

项目入口 index.js #

import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './components/root/App';
import reportWebVitals from './reportWebVitals';
import 'bootstrap/dist/css/bootstrap.min.css';
import { Provider } from 'react-redux'
import configureStore from './redux/reducers/configureStore'
import 'alertifyjs/build/css/alertify.min.css'
import { BrowserRouter } from 'react-router-dom'


const store = configureStore();

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <BrowserRouter>
      <Provider store={store}>
        <App />
      </Provider>
    </BrowserRouter>
  </React.StrictMode>
);
reportWebVitals();

报错根源是configureStore文件中rootReducer的导入方式错误：

• 你的rootReducer采用默认导出（export default rootReducer），但导入时使用了命名空间导入语法import * as rootReducer from './index.js'，这种写法拿到的是整个ES模块对象，不是rootReducer函数本身，传给createStore的参数类型不符合要求，直接触发报错。
• 将configureStore中的导入语句替换为默认导入即可修复：

// 替换原错误的导入语句
import rootReducer from './index.js'

• 如果修改后仍报错，检查./index.js的相对路径是否正确，确认指向你编写rootReducer的文件，避免导入错其他同名文件。

内容的提问来源于stack exchange，提问作者Adonis