webpack.prod.js

const path = require('path');
const common = require('./webpack.common');
const { merge } = require('webpack-merge');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = merge(common, {
  mode: 'production',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].[contenthash].bundle.js',
  },
  optimization: {
    minimize: true,
    minimizer: [
      '...',
      new CssMinimizerPlugin(),
    ],
  },
  module: {
    rules: [
      {
        test: /\.s?css$/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].bundle.css',
    }),
  ],
});