webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: '[name].bundle.js',
    chunkFilename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html'
    }),
    new CleanWebpackPlugin(path.resolve(__dirname, 'dist'), {})
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: ['es2015', 'react'],
            plugins: ["syntax-dynamic-import"]
          }
        }
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      }
    ]
  },
  optimization: {
    splitChunks: {
      chunks: 'all'
    }
  },
  devServer: {
    contentBase: path.join(__dirname, 'dist')
  }
}