webpack.config.prod.js

const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const UglifyjsWebpackPlugin = require('uglifyjs-webpack-plugin'); // eslint-disable-line
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  mode: 'production',
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'gdpr-cookies.js',
    library: 'initGdprCookie',
    libraryTarget: 'umd',
  },
  module: {
    rules: [
      // eslint detect error before compil
      {
        enforce: 'pre',
        test: /\.jsx?$/,
        loader: 'eslint-loader',
        exclude: /node_modules/,
        options: {
          emitWarning: true,
        },
      },
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
        },
      },
      {
        test: /\.(scss|css)/,
        exclude: /node_modules/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader'],
      },
      {
        test: /\.svg$/,
        use: ['desvg-loader/preact', 'svg-loader'],
      },
    ],
  },
  resolve: {
    alias: {
      react: 'preact/compat',
      'react-dom': 'preact/compat',
    },
    extensions: ['*', '.js', '.json', '.svg'],
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production'),
    }),
    new HtmlWebpackPlugin({
      template: 'src/index.html',
    }),
    new MiniCssExtractPlugin({
      filename: `gdpr-cookies.css`,
    }),
    new MiniCssExtractPlugin({
      filename: `gdpr-cookies.source.css`,
    }),
    new UglifyjsWebpackPlugin({
      sourceMap: true,
      cache: true,
      parallel: true,
      uglifyOptions: {
        output: {
          comments: false,
        },
      },
    }),
    new OptimizeCssAssetsPlugin({
      assetNameRegExp: /gdpr-cookies\.css$/g,
    }),
  ],
};