首个MERN应用出现'reducers'未从'./reducers'导出的导入错误

基于MERN栈搭建首个应用，参照教程开发时遇到报错：
Attempted import error: 'reducers' is not exported from './reducers'
相关代码如下：

App.js代码 #

import React from "react";
import ReactDom from "react-dom";
import { Provider } from "react-redux";
import { createStore, applyMiddleware, compose } from "redux";
import thunk from "redux-thunk";

import { reducers } from "./reducers";

import App from "./App";

const store = createStore(reducers, compose(applyMiddleware(thunk)));

ReactDom.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById("root")
);

reducers目录下posts.js代码 #

export default reducers = (posts = [], action) => {
  switch (action.type) {
    case "FETCH_ALL":
      return action.payload;
    case "CREATE":
      return posts;
    default:
      return posts;
  }
};

reducers目录下index.js代码 #

import { combineReducers } from "redux";
import Post from "./posts";

export default combineReducers({ posts });

报错界面参考：

一共3处代码错误共同触发报错：

• 导入导出模式不匹配：reducers目录入口文件（index.js）使用export default默认导出合并后的reducer，App.js中却使用import { reducers }具名导入语法，无法匹配到导出项
• combineReducers参数引用错误：index.js中导入posts模块时命名为Post，调用combineReducers时传入的是未定义的posts变量，会触发引用错误
• posts.js导出语法不规范：直接给未声明的reducers变量赋值后导出，ES模块严格模式下会直接抛出变量未定义错误
• 额外笔误：如果当前store初始化逻辑写在App.js文件内，文件中import App from "./App"属于自引用语句，会触发循环依赖问题（正常该段初始化逻辑应该放在项目入口index.js中，而非App.js组件文件内）

按顺序修改对应文件即可：

1. 修改reducers/posts.js，规范导出写法，同时修正CREATE动作的返回逻辑（原逻辑不会追加新创建的帖子）：

const postsReducer = (posts = [], action) => {
  switch (action.type) {
    case "FETCH_ALL":
      return action.payload;
    case "CREATE":
      return [...posts, action.payload];
    default:
      return posts;
  }
};
export default postsReducer;

2. 修改reducers/index.js，统一导入命名，正常合并reducer：

import { combineReducers } from "redux";
import posts from "./posts";

export default combineReducers({ posts });

3. 调整入口文件的导入语句，匹配默认导出规则：如果store初始化逻辑写在src/index.js入口文件中，直接将具名导入改为默认导入即可；如果误写在App.js中，需要把这段逻辑迁移到index.js，删除App.js里的自引用代码。
   正确的入口文件导入写法：

// 改为默认导出对应的导入语法
import reducers from "./reducers";

内容的提问来源于stack exchange，提问作者user12761285