code: function(path) {
    if (path.indexOf('url') === 0) return path;
  
    var options_ = options
      , token_ = token
      , tokens_ = tokens
      , variables_ = variables
      , traits_ = traits
      , depth_ = depth;
  
    var path = path.replace(/['"]/g, '')
      , css = fs.readFileSync(path, 'utf8');
  
    path = join(options.dir, path);
  
    css = parse(lex(css), {
      __proto__: options,
      dir: dirname(path)
    });
  
    options = options_;
    token = token_;
    tokens = tokens_;
    variables = variables_;
    traits = traits_;
    depth = depth_;
  
    return css;
  }
docs: Imported Stylesheets