code: public function init()
      {
          if ($this->sourcePath !== null) {
              $this->sourcePath = rtrim(Yii::getAlias($this->sourcePath), '/\\');
          }
          if ($this->basePath !== null) {
              $this->basePath = rtrim(Yii::getAlias($this->basePath), '/\\');
          }
          if ($this->baseUrl !== null) {
              $this->baseUrl = rtrim(Yii::getAlias($this->baseUrl), '/');
          }
      }
docs: Initializes the bundle.
  If you override this method, make sure you call the parent implementation in the last.