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<?php
declare(strict_types=1);
namespace App\Provider;
use Psr\Container\ContainerInterface;
use Yiisoft\Di\Container;
use Yiisoft\Di\Support\ServiceProvider;
use Yiisoft\Yii\Web\Flash;
use Yiisoft\Yii\Web\Session\SessionInterface;
final class FlashProvider extends ServiceProvider
{
public function register(Container $container): void
$container->set(
Flash::class,
static fn (ContainerInterface $container) => new Flash($container->get(SessionInterface::class))
);
}