webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
    plugins: [
        new CopyPlugin({
            patterns: [
                {
                    from: 'src/img/*',
                    to: 'img/[name].[ext]',
                    // to options: [path][name].[contenthash].[ext]'
                },
            ],
        }),
        new MiniCssExtractPlugin({
            // Options similar to the same options in webpackOptions.output
            // both options are optional
            filename: "css/[name].css",
            chunkFilename: "[id].css"
        }),
    ],
    context: path.resolve(__dirname, './'),
    entry: {
        'index': './src/index.js',
        'admin': './src/admin.js',
    },
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'js/[name].js',
        //publicPath: '../bundles/emscore/',
    },
    module: {
        rules: [
            {
                test: /\.less$/,
                use: [{
                    loader: MiniCssExtractPlugin.loader,
                    options: {
                        // you can specify a publicPath here
                        // by default it use publicPath in webpackOptions.output
                        publicPath: '../'
                    }
                },{
                    loader: 'css-loader', // translates CSS into CommonJS
                    options: {
                        sourceMap: true
                    }
                }, {
                    loader: 'less-loader' // compiles Less to CSS
                }]
            },
            {
                test: /\.(sa|sc|c)ss$/,
                use: [{
                    loader: MiniCssExtractPlugin.loader,
                    options: {
                        // you can specify a publicPath here
                        // by default it use publicPath in webpackOptions.output
                        publicPath: '../'
                    }
                },{
                    loader: 'css-loader',
                    options: {
                        sourceMap: true
                    }
                },
                    // 'postcss-loader',
                    'sass-loader',
                ],
            },
            {
                test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
                loader: 'url-loader',
                options: {
                    limit: 10000,
                    name: 'media/[name].[ext]',
                }
            },
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: [{
                    loader: 'babel-loader',
                    options: {
                        presets: [
                            ['@babel/preset-env']
                        ]
                    }
                }]
            }
        ]
    }
};