class MediaTypeDeleteConfirmForm

class MediaTypeDeleteConfirmForm extends EntityDeleteForm {
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Constructs a new MediaTypeDeleteConfirm object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager) {
        $this->entityTypeManager = $entity_type_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('entity_type.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $num_entities = $this->entityTypeManager
            ->getStorage('media')
            ->getQuery()
            ->accessCheck(FALSE)
            ->condition('bundle', $this->entity
            ->id())
            ->count()
            ->execute();
        if ($num_entities) {
            $form['#title'] = $this->getQuestion();
            $form['description'] = [
                '#type' => 'inline_template',
                '#template' => '<p>{{ message }}</p>',
                '#context' => [
                    'message' => $this->formatPlural($num_entities, '%type is used by @count media item on your site. You can not remove this media type until you have removed all of the %type media items.', '%type is used by @count media items on your site. You can not remove this media type until you have removed all of the %type media items.', [
                        '%type' => $this->entity
                            ->label(),
                    ]),
                ],
            ];
            return $form;
        }
        return parent::buildForm($form, $form_state);
    }

}