code: function inBlackList(port, additionalPorts) {
    const blacklist = [4200].concat(additionalPorts || []);
    return blacklist.indexOf(port) === -1 ? false : true;
  }
docs: Checks if port is in blacklist
  @method inBlackList
  @param  {Number} port we are checking
  @return {Number} additional array of blocked ports