public function transform(string $markdown, int $post_id = 0, array $args = []): string
    {
        global $wp_markdown_extra;
        $mde = $wp_markdown_extra;

        if (!$markdown) {
            return $markdown;
        } elseif (!$this->canTransform()) {
            return $markdown;
        } elseif (!$mde) {
            return $markdown;
        }
        return $mde->a::transform($markdown, $post_id, $args);
    }