protected function registerHTMLMin()
    {
        $this->app->singleton('htmlmin', function (Container $app) {
            $blade = $app['htmlmin.blade'];
            $css = $app['htmlmin.css'];
            $js = $app['htmlmin.js'];
            $html = $app['htmlmin.html'];

            return new HTMLMin($blade, $css, $js, $html);
        });

        $this->app->alias('htmlmin', HTMLMin::class);
    }