buildSetExtraKey example

return $directory.\DIRECTORY_SEPARATOR.$class->getFilename();
    }

    private function writeClasses(): void
    {
        foreach ($this->classes as $class) {
            $this->buildConstructor($class);
            $this->buildToArray($class);
            if ($class->getProperties()) {
                $class->addProperty('_usedProperties', null, '[]');
            }
            $this->buildSetExtraKey($class);

            file_put_contents($this->getFullPath($class), $class->build());
        }

        $this->classes = [];
    }

    private function buildNode(NodeInterface $node, ClassBuilder $class, string $namespace): void
    {
        if (!$node instanceof ArrayNode) {
            throw new \LogicException('The node was expected to be an ArrayNode. This Configuration includes an edge case not supported yet.');
        }