prod.webpack.config.js

const merge = require('webpack-merge');
const base = require('./base.webpack.config.js');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const CompressionPlugin = require('compression-webpack-plugin');

module.exports = merge(base, {
  mode: 'production',
  output: {
    filename: '[name].[chunkhash].js',
  },
  module: {
    rules: [
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        use: [
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[name]__[local]__[hash:base64:5]',
              },
              localsConvention: 'camelCase',
            },
          },
          {
            loader: 'sass-loader',
            options: {
              implementation: require('sass'),
            },
          },
        ],
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].[chunkhash].css',
      chunkFilename: '[id].css',
    }),
    new CompressionPlugin({
      filename: '[path].gz[query]',
      algorithm: 'gzip',
      test: /\.js$|\.jsx$|\.scss$|\.css$|\.html$/,
      threshold: 1024,
      minRatio: 0.8,
    }),
  ],
});