docs: function bundleCSS() {
      const glob      = require('glob');
      const srcmap    = require('./srcmap');
      const BUILT_PATH = path.join(__dirname, '..', config.dir.built);
  
      glob.sync('**/*.css', {
          cwd: BUILT_PATH
      }).forEach((file) => {
          const src = fs.readFileSync(path.join(BUILT_PATH, file)).toString()
              .replace(/^\ufeff/gm, '')
              .replace(/\r\n/gm, '\n')
          ;
          const node = srcmap.getNodeFromCode(src);
          node.prepend(banner('.css', path.basename(file, '.css')));
          const bundleSrc = '\ufeff' + srcmap.getCodeFromNode(node, (srcPath) => {
              const regex_src = new RegExp(`${config.dir.src}\\/${config.dir.stylesheet}\\/`);
              return srcPath
                  .replace(/\.\.\//g, '')
                  .replace(regex_src, SOURCE_MAP_NAMESPACE)
              ;
          }, { multiline: true });
          fs.writeFileSync(path.join(BUILT_PATH, file), bundleSrc);
          fs.writeFileSync(path.join(DST_PATH, file), bundleSrc);
      });
  }