webpack.config.prod.js

'use strict'

const webpack = require('webpack');
const path = require('path');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
  entry: './index.js',
  output: {
    path: path.join(__dirname, '/dist'),
    filename: 'articulate-chatbot-widget.js',
    library: 'ArticulateChatbotWidget',
    libraryTarget: 'umd'
  },
  resolve: {
    extensions: ['.js']
  },
  mode: 'production',
  module: {
    rules: [
      {
        test: /\.js?$/,
        loader: "babel-loader",
        exclude: /(node_modules|bower_components)/
      },
      {
        test: /\.(png|jpe?g|gif)$/i,
        use: [
          {
            loader: 'file-loader',
          },
        ],
      },
      {
        test: /\.css$/i,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader'
        ]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(),
    /**
     * Known issue for the CSS Extract Plugin in Ubuntu 16.04: You'll need to install
     * the following package: sudo apt-get install libpng16-dev
     */
    new MiniCssExtractPlugin({
      filename: 'articulate-chatbot-widget.css',
      chunkFileName: '[id].css'
    }),
    //new BundleAnalyzerPlugin() Enable if you want to check stats
  ],
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  }
};