language_level.php

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<?php

declare(strict_types=1);

use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
use Rector\Core\Configuration\Option;
use Rector\Core\ValueObject\PhpVersion;

return static function (ContainerConfigurator $containerConfigurator): void {
    // We need the parameters to set e.g. the language level of PHP
    $parameters = $containerConfigurator->parameters();
    $parameters->set(Option::PHP_VERSION_FEATURES, PhpVersion::PHP_74);
};