code: function (err, html) {
        callback && callback(Minify(html, {
          collapseWhitespace: true,
          removeComments: true,
          removeCommentsFromCDATA: true,
          removeAttributeQuotes: true,
          removeRedundantAttributes: true,
          removeEmptyAttributes: true,
          minifyJS: process.env.NODE_ENV === 'production',
          minifyCSS: process.env.NODE_ENV === 'production'
        }));
      }
docs: done