webpack.base.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const ExtractTextWebpackPlugin = require('extract-text-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
    entry: {
        main: __dirname + '/src/index'
    },
    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'build')
    },
    resolve: {
        extensions: ['.jsx', '.mjs', '.js']
    },
    module: {
        rules: [
            {
                test: /\.(less|css)$/,
                use: ExtractTextWebpackPlugin.extract({
                    fallback: "style-loader",
                    use: [
                        "css-loader",
                        {
                            loader: "less-loader",
                            options:{
                                javascriptEnabled: true
                            }
                        }
                    ]
                })
            },
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                use: [
                    "babel-loader"
                ]
            },
        ]
    },
    plugins: [
        new CleanWebpackPlugin(['build']),
        new HtmlWebpackPlugin({
            template: './public/index.html',
        }),
        new ExtractTextWebpackPlugin('css/style.css'),
    ]
}