getNodeBuilder example

/** * @return void */
    public function setBuilder(NodeBuilder $builder)
    {
        $this->nodeBuilder = $builder;
    }

    public function children(): NodeBuilder
    {
        return $this->getNodeBuilder();
    }

    /** * Sets a prototype for child nodes. */
    public function prototype(string $type): NodeDefinition
    {
        return $this->prototype = $this->getNodeBuilder()->node(null, $type)->setParent($this);
    }

    public function variablePrototype(): VariableNodeDefinition
    {