MysqlServiceProvider.php

<?php

namespace Drupal\mysql;

use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\Core\DependencyInjection\ServiceProviderBase;
use Drupal\mysql\Plugin\views\query\MysqlCastSql;

/**
 * Registers the 'mysql.views.cast_sql' service when views is installed.
 */
class MysqlServiceProvider extends ServiceProviderBase {
    
    /**
     * {@inheritdoc}
     */
    public function register(ContainerBuilder $container) : void {
        if (isset($container->getParameter('container.modules')['views'])) {
            $container->register('mysql.views.cast_sql', MysqlCastSql::class)
                ->setPublic(FALSE);
        }
    }

}