module.exports = {
  isValidErrorCode: function(code) {
    return (code >= 1000 && code <= 1010 && code != 1004 && code != 1005 && code != 1006) ||
         (code >= 3000 && code <= 4999);
  },
  1000: 'normal',
  1001: 'going away',
  1002: 'protocol error',
  1003: 'unsupported data',
  1004: 'reserved',
  1005: 'reserved for extensions',
  1006: 'reserved for extensions',
  1007: 'inconsistent or invalid data',
  1008: 'policy violation',
  1009: 'message too big',
  1010: 'extension handshake missing',
};