code: private function ensureNewLineAt(Tokens $tokens, $position)
      {
          $lineEnding = $this->whitespacesConfig->getLineEnding();
          $content = $lineEnding.$this->getIndentAt($tokens, $position);
  
          $whitespaceToken = $tokens[$position - 1];
          if (!$whitespaceToken->isGivenKind(T_WHITESPACE)) {
              if ($whitespaceToken->isGivenKind(T_OPEN_TAG)) {
                  $content = Preg::replace('/\R/', '', $content);
                  if (!Preg::match('/\R/', $whitespaceToken->getContent())) {
                      $tokens[$position - 1] = new Token([T_OPEN_TAG, Preg::replace('/\s+$/', $lineEnding, $whitespaceToken->getContent())]);
                  }
              }
  
              if ('' !== $content) {
                  $tokens->insertAt($position, new Token([T_WHITESPACE, $content]));
  
                  return $position;
              }
  
              return $position - 1;
          }
  
          if ($tokens[$position - 2]->isGivenKind(T_OPEN_TAG) && Preg::match('/\R/', $tokens[$position - 2]->getContent())) {
              $content = Preg::replace('/^\R/', '', $content);
          }
  
          if (!Preg::match('/\R/', $whitespaceToken->getContent())) {
              $tokens[$position - 1] = new Token([T_WHITESPACE, $content]);
          }
  
          return $position - 1;
      }
docs: @param Tokens $tokens
  @param int    $position
  
  @return int The newline token position