Sample Webpack 4 config

webpack.config.js

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

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

module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader'
        }
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: true,
              importLoaders: 1,
              localIdentName: '[name]_[local]_[hash:base64]', // Allows for duplicate class names between components
              sourceMap: true,
              minimize: true
            }
          },
          'postcss-loader'
        ]
      }
    ]
  },
  plugins: [htmlWebpackPlugin],
  devServer: {
    historyApiFallback: true
  }
}