code: function unknownOption (flag, type = 'option') {
    if (this._allowUnknownOption) return
  
    logger.error()
    logger.error(`  error: unknown ${type}:`, flag)
    logger.error()
    this.outputHelp()
    util.exit(1)
  }
docs: patch "commander" method called when a user passed an unknown option we want to print help for the current command and exit with an error