public function field($name, $alias = null, $i18n = false)
    {
        $this->config[$this->pointer][$name] = [
            'name' => $name,
            'i18n' => $i18n,
            'alias' => (is_null($alias)) ? $name : $alias,
            'type' => null,
            'extraField' => false,
        ];

        $this->field = $name;

        return $this;
    }