@type t() ::
  ((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((:custom
                                                                  | :twitter_post)
                                                                 | :linkedin_post)
                                                                | :insta_post_square)
                                                               | :insta_post_portrait)
                                                              | :insta_story)
                                                             | :insta_ad)
                                                            | :facebook_post)
                                                           | :facebook_cover_photo)
                                                          | :facebook_event_cover)
                                                         | :facebook_ad_portrait)
                                                        | :facebook_ad_square)
                                                       | :pinterest_ad_pin)
                                                      | :twitter_banner)
                                                     | :linkedin_post_square)
                                                    | :linkedin_post_portrait)
                                                   | :linkedin_post_landscape)
                                                  | :linkedin_profile_banner)
                                                 | :linkedin_article_banner)
                                                | :linkedin_ad_landscape)
                                               | :linkedin_ad_square)
                                              | :linkedin_ad_vertical)
                                             | :youtube_thumbnail)
                                            | :youtube_banner)
                                           | :youtube_ad)
                                          | :twitch_banner)
                                         | :google_leaderboard_ad)
                                        | :google_large_ad)
                                       | :google_med_ad)
                                      | :google_mobile_banner_ad)
                                     | :google_skyscraper_ad)
                                    | :card_horizontal)
                                   | :card_vertical)
                                  | :print_us_letter)
                                 | :poster)
                                | :banner_standard)
                               | :banner_wide)
                              | :banner_ultrawide)
                             | :name_tag_portrait)
                            | :name_tag_landscape)
                           | :insta_reel_cover)
                          | :zoom_background)
                         | :tiktok_post)
                        | :insta_ad_portrait)
                       | :insta_post_tall_portrait)
                      | :twitter_post_square)
                     | :facebook_post_square)
                    | :facebook_post_portrait)
                   | :facebook_story)
                  | :google_square_ad)
                 | :google_small_square_ad)
                | :google_narrow_skyscraper_ad)
               | :google_half_page_ad)
              | :google_large_leaderboard_ad)
             | :google_billboard_ad)
            | :google_banner_leaderboard_ad)
           | :google_top_banner_ad)
          | :google_mobile_leaderboard_banner_ad)
         | :google_large_mobile_banner_ad)
        | :google_mobile_interstitial_ad)
       | :google_mobile_med_rectangle_ad)
      | :pinterest_pin_standard)
     | :pinterest_pin_square)
    | :pinterest_ad_square)
   | :print_a4)
  | integer()