webpack.config.prod.js

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
// const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  mode: 'production',
  entry: path.resolve(__dirname, 'lib/index'),
  externals: { 'styled-components': 'styled-components' },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'react-simple-chatbot.js',
    publicPath: 'dist/',
    library: 'ReactSimpleChatbot',
    libraryTarget: 'umd',
    globalObject: 'typeof self !== \'undefined\' ? self : this',
  },
  resolve: {
    extensions: ['.js', '.jsx'],
  },
  plugins: [
    new CleanWebpackPlugin(['dist']),
    new UglifyJsPlugin({
      comments: false,
    }),
    // new BundleAnalyzerPlugin(),
  ],
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: [
              '@babel/plugin-transform-arrow-functions',
              '@babel/plugin-proposal-class-properties',
            ],
          },
        },
      },
    ],
  },
};