Discourse::is_valid_sync_post_type PHP Method

    function is_valid_sync_post_type($postid = null)
    {
        // is_single() etc. is not reliable
        $allowed_post_types = $this->get_allowed_post_types();
        $current_post_type = get_post_type($postid);
        return in_array($current_post_type, $allowed_post_types);
    }