core-bundle/src/DependencyInjection/ContaoCoreExtension.php
private function overwriteImageTargetDir(array $config, ContainerBuilder $container): void
    {
        if (!isset($config['image']['target_path'])) {
            return;
        }

        $container->setParameter(
            'contao.image.target_dir',
            $container->getParameter('kernel.project_dir').'/'.$config['image']['target_path']
        );

        @trigger_error('Using the contao.image.target_path parameter has been deprecated and will no longer work in Contao 5.0. Use the contao.image.target_dir parameter instead.', E_USER_DEPRECATED);
    }
private function overwriteImageTargetDir(array $config, ContainerBuilder $container): void
    {
        if (!isset($config['image']['target_path'])) {
            return;
        }

        $container->setParameter(
            'contao.image.target_dir',
            $container->getParameter('kernel.project_dir').'/'.$config['image']['target_path']
        );

        @trigger_error('Using the contao.image.target_path parameter has been deprecated and will no longer work in Contao 5.0. Use the contao.image.target_dir parameter instead.', E_USER_DEPRECATED);
    }
Reads the old contao.image.target_path parameter.