create-react-ssr/src/webpack.config.dev.js

const path = require('path');
const dotenv = require('dotenv').config();
const webpack = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const ReactRefreshWebpackPlugin = require('@pmmmwh/react-refresh-webpack-plugin');

module.exports = {
    entry: ['webpack-hot-middleware/client?path=/reload_wss&timeout=2000&overlay=false&reload=true', './frontend/index.js'],
    output: {
        path: path.resolve(__dirname, 'build'),
        filename: 'assets/app.js',
    },
    resolve: {
        extensions: ['.js', '.jsx'],
        alias: {
            '@components': path.resolve(__dirname, 'frontend/components/'),
            '@styles': path.resolve(__dirname, 'frontend/styles/'),
        }
    },
    mode: 'development',
    module: {
        rules: [
            {
                test: /\.(js|jsx|tsx)$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: { plugins: ['react-refresh/babel'] }
                },
            },
            {
                test: /\.(css|sass|scss)$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    'sass-loader',
                ], 
            },
        ]
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new ReactRefreshWebpackPlugin(),
        new MiniCssExtractPlugin({
            filename: 'assets/app.css',
        }),
        new webpack.DefinePlugin({
            'process.env': JSON.stringify(dotenv.parsed),
        }),
    ],
    optimization: {
        splitChunks: {
            chunks: 'async',
            cacheGroups: {
                vendors: {
                    name: 'vendors',
                    chunks: 'all',
                    reuseExistingChunk: true,
                    priority: 1,
                    filename: 'assets/vendor.js',
                    enforce: true,
                    test (module, chunks){
                    const name = module.nameForCondition && module.nameForCondition();
                    return chunks.name !== 'vendors' && /[\\/]node_modules[\\/]/.test(name);  
                    },
                },
            },
        },
    },
}