code: static public function register()
      {
          // only register once
          if (static::$registered === true) {
              return true;
          }
          $kirby = kirby();
          if (!class_exists('Kirby\Component\Template')) {
              throw new Exception('The Kirby Twig plugin requires Kirby 2.3 or higher. Current version: ' . $kirby->version());
          }
          if (!class_exists('Twig_Environment')) {
              require_once __DIR__.'/../lib/Twig/lib/Twig/Autoloader.php';
              \Twig_Autoloader::register();
          }
          $kirby->set('component', 'template', 'Kirby\Twig\TwigComponent');
          if (is_executable('twig') === false) {
              require_once __DIR__ . '/helpers.php';
          }
          return static::$registered = true;
      }
docs: Register the template component and load the `twig` helper function
  @return bool
  @throws Exception