code: public function start(Tick $tick)
      {
          if ($tick->getMessage()) {
              $this->output->writeln($tick->getMessage());
          }
  
          $this->progressBar = new ProgressBar(
              $this->output,
              $tick->getReport()->getTotalItemCount() > -1
                  ? $tick->getReport()->getTotalItemCount()
                  : 0
          );
  
          $this->progressBar->start();
      }
docs: Start callback
  
  @param Tick $tick