buildMediaLibraryUi example

    if ($form_state::hasAnyErrors()) {
      $response->addCommand(new ReplaceCommand('#media-library-add-form-wrapper', $form));
      return $response;
    }

    // Check if the remove button is clicked.     if (end($triggering_element['#parents']) === 'remove_button') {
      // When the list of added media is empty, return to the media library and       // shift focus back to the first tabbable element (which should be the       // source field).       if (empty($added_media)) {
        $response->addCommand(new ReplaceCommand('#media-library-add-form-wrapper', $this->buildMediaLibraryUi($form_state)));
        $response->addCommand(new FocusFirstCommand('#media-library-add-form-wrapper'));
      }
      // When there are still more items, update the form and shift the focus to       // the next media item. If the last list item is removed, shift focus to       // the previous item.       else {
        $response->addCommand(new ReplaceCommand("#$wrapper_id", $form));

        // Find the delta of the next media item. If there is no item with a         // bigger delta, we automatically use the delta of the previous item and         // shift the focus there.
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