webpack.config.js

.js

const path = require('path');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname, '../public'),
    filename: 'bundle.js',
  },
  devtool: 'source-map',
  resolve: {
    modules: ['node_modules', path.resolve('src')],
    extensions: ['.js', '.jsx', '.json'],
  },
  module: {
    rules: [
      {
        enforce: 'pre',
        test: /\.jsx?$/,
        exclude: [/node_modules/, /additional_modules/],
        use: ['eslint-loader'],
      },
      {
        test: /\.jsx?$/,
        exclude: [/node_modules/, /additional_modules/],
        use: {
          loader: 'babel-loader',
        },
      },
    ],
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        uglifyOptions: {
          compress: false,
          ecma: 6,
          mangle: true,
        },
        sourceMap: true,
      }),
    ],
  },
  devServer: {
    contentBase: path.join(__dirname, '../public'),
    historyApiFallback: true,
    compress: true,
    hot: true,
    port: 3000,
  },
};