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 [];
    }

}