BlockDisplayVariant.php

<?php

namespace Drupal\ctools_block_display_test\Plugin\DisplayVariant;

use Drupal\ctools\Plugin\DisplayVariant\BlockDisplayVariant as BaseBlockDisplayVariant;

/**
 *
 */
class BlockDisplayVariant extends BaseBlockDisplayVariant {
  
  /**
   * {@inheritdoc}
   */
  public function getRegionNames() {
    return [];
  }
  
  /**
   * {@inheritdoc}
   */
  public function build() {
    return [];
  }

}