code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          // ignore files with short open tag and ignore non-monolithic files
          if (!$tokens[0]->isGivenKind(T_OPEN_TAG) || !$tokens->isMonolithicPhp()) {
              return;
          }
  
          $newlineFound = false;
          foreach ($tokens as $token) {
              if ($token->isWhitespace() && false !== strpos($token->getContent(), "\n")) {
                  $newlineFound = true;
  
                  break;
              }
          }
  
          // ignore one-line files
          if (!$newlineFound) {
              return;
          }
  
          $token = $tokens[0];
          $tokens[0] = new Token([$token->getId(), rtrim($token->getContent()).$this->whitespacesConfig->getLineEnding()]);
      }
docs: {@inheritdoc}