gistfile1.txt

        /**
         * @param string $url
         */
        protected static function getFileSystem( $url = '' ) {
                if ( empty( $url ) ) {
                        $url = wp_nonce_url( 'admin.php?page=vc-general', 'wpb_js_settings_save_action' );
                }
                if ( false === ( $creds = request_filesystem_credentials( $url, '', false, false, null ) ) ) {
                        _e( 'This is required to enable file writing for js_composer', 'js_composer' );
                        exit(); // stop processing here
                }
                $upload_dir = wp_upload_dir();
                if ( ! WP_Filesystem( $creds, $upload_dir['basedir'] ) ) {
                        request_filesystem_credentials( $url, '', true, false, null );
                        _e( 'This is required to enable file writing for js_composer', 'js_composer' );
                        exit();
                }
        }