code: private function getFixersConflicts(FixerInterface $fixer)
      {
          static $conflictMap = [
              'no_blank_lines_before_namespace' => ['single_blank_line_before_namespace'],
          ];
  
          $fixerName = $fixer->getName();
  
          return \array_key_exists($fixerName, $conflictMap) ? $conflictMap[$fixerName] : [];
      }
docs: @param FixerInterface $fixer
  
  @return null|string[]