whole_func_string: function end() {
      try {
        this.queue(transformCss(filePath, data, opts));
      } catch(err) {
        this.emit("error", new Error(err));
      }
  
      this.queue(null);
    }
func_code_string: function end() {
      try {
        this.queue(transformCss(filePath, data, opts));
      } catch(err) {
        this.emit("error", new Error(err));
      }
  
      this.queue(null);
    }
func_documentation_string: Implementation of through interface.