code: function checkKeyCodes (
    eventKeyCode,
    key,
    builtInAlias
  ) {
    var keyCodes = config.keyCodes[key] || builtInAlias;
    if (Array.isArray(keyCodes)) {
      return keyCodes.indexOf(eventKeyCode) === -1
    } else {
      return keyCodes !== eventKeyCode
    }
  }
docs: /* 
  Runtime helper for checking keyCodes from config.