webpack.config.js

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

module.exports = {
  mode: 'production',
  entry: './src/js/swn.js',
  output: {
    filename: 'swn.js',
    path: path.resolve(__dirname, 'dist'),
    library: {
      name: 'SWN',
      type: 'umd',
      export: 'default',
      umdNamedDefine: true
    },
    globalObject: 'this'
  },
  optimization: {
    minimize: true,
    minimizer: [
      new TerserPlugin({
        extractComments: false,
        terserOptions: {
          format: {
            comments: false,
          }
        },
      }),
    ],
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader']
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'swn.css'
    })
  ]
};