Sample.php

<?php
declare(strict_types=1);

namespace BDC\Declarative\Setup\Patch\Schema;

use Magento\Framework\Setup\Patch\SchemaPatchInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
/**
* Patch is mechanism, that allows to do atomic upgrade data changes
*/
class Sample implements SchemaPatchInterface{
    /**
     * @var ModuleDataSetupInterface $moduleDataSetup
     */
    private $moduleDataSetup;
    /**
     * @param ModuleDataSetupInterface $moduleDataSetup
     */
    public function __construct(ModuleDataSetupInterface $moduleDataSetup) {
        $this->moduleDataSetup = $moduleDataSetup;
    }
    /**
     * Do Upgrade
     *
     * @return void
     */
    public function apply() { }
    /**
     * {@inheritdoc}
     */
    public function getAliases() { return []; }
    /**
     * {@inheritdoc}
     */
    public static function getDependencies() { return [ ]; }
}