code: public function onRegisterSeoHook (&$context)
  	{
  		$craft = \Craft::$app;
  		$metaTemplateName = $this->getSettings()['metaTemplate'];
  
  		if ($metaTemplateName)
  			return $craft->view->renderTemplate(
  				$metaTemplateName,
  				$context
  			);
  
  		$oldTemplateMode = $craft->view->getTemplateMode();
  		$craft->view->setTemplateMode(View::TEMPLATE_MODE_CP);
  		$rendered = $craft->view->renderTemplate(
  			'seo/_seo/meta',
  			$context
  		);
  		$craft->view->setTemplateMode($oldTemplateMode);
  		return $rendered;
  	}
docs: @param $context
  
  @return string
  @throws \Twig_Error_Loader
  @throws \yii\base\Exception