code: func NewCLI(out, err io.Writer) *CLI {
  	return &CLI{
  		outStream: out,
  		errStream: err,
  		signalCh:  make(chan os.Signal, 1),
  		stopCh:    make(chan struct{}),
  	}
  }
docs: // NewCLI creates a new CLI object with the given stdout and stderr streams.