webpack.config.js

    plugins: [
      isProd && new webpack.optimize.SplitChunksPlugin({}),

      new htmlPlugin({
        filename: 'index.html',
        template: 'src/index.html',
        chunks: ['index'],
      }),

      isProd && new BundleAnalyzerPlugin({
        analyzerMode: 'static',
        defaultSizes: 'gzip',
        openAnalyzer: false
      }),

    ].filter(Boolean), // Filtruje wszystkie elementy "false"