Method "Symfony\Component\Config\Definition\ConfigurationInterface::getConfigTreeBuilder()" might add "TreeBuilder" as a native return type declaration in the future. Do the same in implementation "Limenius\ReactBundle\DependencyInjection\Configuration" now to avoid errors or add an explicit @return annotation to suppress this message.
Method "Symfony\Component\Config\Definition\ConfigurationInterface::getConfigTreeBuilder()" might add "TreeBuilder" as a native return type declaration in the future. Do the same in implementation "Limenius\ReactBundle\DependencyInjection\Configuration" now to avoid errors or add an explicit @return annotation to suppress this message.