webpack.config.js

const HtmlWebPackPlugin = require('html-webpack-plugin');

const path = require('path');

const htmlPlugin = new HtmlWebPackPlugin({
  template: './src/index.html',
  filename: './index.html'
});

module.exports = {
  entry: ['babel-polyfill', './src/app.js'],
  output: {
    path: path.resolve('dist'),
    filename: 'bundle.js'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  module: {
    rules: [
      {
        test: /\.jsx?$/,
        exclude: /node_modules/,

        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: 'style-loader'
          },
          {
            loader: 'css-loader',
            options: {
              modules: true,
              importLoaders: 1,
              localIdentName: '[name]_[local]_[hash:base64]',
              sourceMap: true,
              minimize: true
            }
          }
        ]
      }
    ]
  },
  plugins: [htmlPlugin]
};