webpack.config.js

const TerserPlugin = require('terser-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
    entry: {
        'lemon-reset': './src/index.js',
    },
    output: {
        library: 'LemonReset',
        libraryTarget: 'umd',
        /**
         * This is a workaround to add NodeJS support to our UMD module. We can remove it
         * once `target: "universal"` is actually supported:
         *     https://github.com/webpack/webpack/issues/6525
         */
        globalObject: `(typeof self !== 'undefined' ? self : this)`,
    },
    externals: {
        react: {
            commonjs: 'react',
            commonjs2: 'react',
            amd: 'React',
            root: 'React',
        },
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        babelrc: true,
                    },
                },
            },
            {
                test: /\.css$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    {
                        loader: 'css-loader',
                        options: {
                            modules: true,
                            localIdentName: '[local]--[hash:base64:5]',
                        },
                    },
                ],
            },
        ],
    },
    optimization: {
        minimizer: [new TerserPlugin(), new OptimizeCSSAssetsPlugin({})],
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: '[name].css',
        }),
    ],
};