core-bundle/src/DependencyInjection/Compiler/AddSessionBagsPass.php
public function process(ContainerBuilder $container): void
    {
        if (!$container->hasDefinition('session')) {
            return;
        }

        $session = $container->findDefinition('session');
        $session->addMethodCall('registerBag', [new Reference('contao.session.contao_backend')]);
        $session->addMethodCall('registerBag', [new Reference('contao.session.contao_frontend')]);
    }
public function process(ContainerBuilder $container): void
    {
        if (!$container->hasDefinition('session')) {
            return;
        }

        $session = $container->findDefinition('session');
        $session->addMethodCall('registerBag', [new Reference('contao.session.contao_backend')]);
        $session->addMethodCall('registerBag', [new Reference('contao.session.contao_frontend')]);
    }
{@inheritdoc}