webpack.config.prod.js

const path = require('path')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  mode: 'production',
  devtool: false,
  entry: {
    app: './src/js/app.js'
  },
  output: {
    filename: '[name].[contenthash].js',
    path: path.resolve(__dirname, 'dist')
  },
  optimization: {
    moduleIds: 'hashed',
    runtimeChunk: 'single',
    splitChunks: {
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          chunks: 'all'
        }
      }
    }
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].bundle.css',
      chunkFilename: '[id].css'
    }),
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      title: 'Webpack Boilerplate',
      template: path.resolve('./src/index.html'),
      favicon: './src/images/favicon.png'
    })
  ],
  module: {
    rules: [
      {
        test: /\.css$/,
        include: path.resolve(__dirname, 'src'),
        exclude: /node_modules/,
        use: [
          'style-loader',
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: 'css-loader',
            options: {
              importLoaders: 1
            }
          },
          'postcss-loader'
        ]
      },
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env']
          }
        }
      },
      {
        test: /\.(jpg|jpeg|gif|png|svg)$/,
        use: {
          loader: 'file-loader',
          options: {
            outputPath: './images',
            name: '[name].[ext]'
          }
        }
      },
      {
        test: /\.html$/,
        use: {
          loader: 'html-loader'
        }
      }
    ]
  }
}