webpack.config.babel.js

import HtmlWebpackPlugin from 'html-webpack-plugin'
import UglifyJsWebpackPlugin from 'uglifyjs-webpack-plugin'
import CleanWebpackPlugin from 'clean-webpack-plugin'

module.exports = {
  mode: 'development',
  entry: {
    app: './src/index.js'
  },
  output: {
    filename: '[name]-[hash].bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: 'babel-loader'
      },
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        use: ['style-loader', 'css-loader', 'sass-loader']
      },
      {
        test: /\.pug$/,
        use: 'pug-loader'
      }
    ]
  },
  optimization: {
    splitChunks: {
      name: true,
      cacheGroups: {
        vendor: {
          test: /node_modules/,
          chunks: 'initial',
          name: 'vendor',
          priority: 10,
          enforce: true
        }
      }
    }
  },
  resolve: {
    extensions: ['.js']
  },
  plugins: [
    new CleanWebpackPlugin(['./dist']),
    new HtmlWebpackPlugin({
      template: './src/index.pug'
    }),
    new UglifyJsWebpackPlugin()
  ]
}