code: public function init()
      {
          parent::init();
          $this->basePath = Yii::getAlias($this->basePath);
          if (!is_dir($this->basePath)) {
              throw new InvalidConfigException("The directory does not exist: {$this->basePath}");
          }
  
          $this->basePath = realpath($this->basePath);
          $this->baseUrl = rtrim(Yii::getAlias($this->baseUrl), '/');
      }
docs: Initializes the component.
  @throws InvalidConfigException if [[basePath]] does not exist.