MessengerConfig example

 elseif (0 < \func_num_args()) {
            throw new InvalidConfigurationException('The node created by "someCleverName()" has already been initialized. You cannot pass values the second time you call someCleverName().');
        }

        return $this->someCleverName;
    }

    public function messenger(array $value = []): \Symfony\Config\NodeInitialValues\MessengerConfig
    {
        if (null === $this->messenger) {
            $this->_usedProperties['messenger'] = true;
            $this->messenger = new \Symfony\Config\NodeInitialValues\MessengerConfig($value);
        } elseif (0 < \func_num_args()) {
            throw new InvalidConfigurationException('The node created by "messenger()" has already been initialized. You cannot pass values the second time you call messenger().');
        }

        return $this->messenger;
    }

    public function getExtensionAlias(): string
    {
        return 'node_initial_values';
    }

    

 elseif (0 < \func_num_args()) {
            throw new InvalidConfigurationException('The node created by "translator()" has already been initialized. You cannot pass values the second time you call translator().');
        }

        return $this->translator;
    }

    public function messenger(array $value = []): \Symfony\Config\AddToList\MessengerConfig
    {
        if (null === $this->messenger) {
            $this->_usedProperties['messenger'] = true;
            $this->messenger = new \Symfony\Config\AddToList\MessengerConfig($value);
        } elseif (0 < \func_num_args()) {
            throw new InvalidConfigurationException('The node created by "messenger()" has already been initialized. You cannot pass values the second time you call messenger().');
        }

        return $this->messenger;
    }

    public function getExtensionAlias(): string
    {
        return 'add_to_list';
    }