code: private function getTypesContent()
      {
          if (null === $this->typesContent) {
              $name = $this->getTag()->getName();
  
              if (!$this->supportTypes()) {
                  throw new \RuntimeException('This tag does not support types.');
              }
  
              $matchingResult = Preg::match(
                  '{^(?:\s*\*|/\*\*)\s*@'.$name.'\s+'.self::REGEX_TYPES.'(?:[ \t].*)?$}sx',
                  $this->lines[0]->getContent(),
                  $matches
              );
  
              $this->typesContent = 1 === $matchingResult
                  ? $matches['types']
                  : '';
          }
  
          return $this->typesContent;
      }
docs: Get the current types content.
  
  Be careful modifying the underlying line as that won't flush the cache.
  
  @return string