code: public function getTypeAllowableValues()
      {
          return [
              self::TYPE_START,
              self::TYPE_END,
              self::TYPE_INTERMEDIATE_CATCH,
              self::TYPE_INTERMEDIATE_THROW,
              self::TYPE_BOUNDARY,
              self::TYPE_IMPLICIT_THROW,
          ];
      }
docs: Gets allowable values of the enum
  @return string[]