我使用commonjs規(guī)范定義了兩個(gè)模塊

a.js文件

exports.aaaFn = () => {
    console.log('*****************************');
    console.log('我是a模塊');
    console.log('*******************************');
};

b.js文件

const aFn = require('./a');


console.log(aFn.aaaFn());

使用webpack按照commonjs規(guī)范打包，運(yùn)行后報(bào)錯(cuò)。webpack.config.js如下

const path = require('path');

module.exports = {
    entry: './js/b.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js',
        libraryTarget: 'commonjs'
    },
    mode: 'development'
};

在瀏覽器運(yùn)行的時(shí)候報(bào)如下錯(cuò)誤

求大佬知道下這是怎么回事