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const known: Record<number, string> = {  1000: 'Normal Closure',  1001: 'Going Away',  1002: 'Protocol Error',  1003: 'Unsupported Data',  1004: '(For future)',  1005: 'No Status Received',  1006: 'Abnormal Closure',  1007: 'Invalid frame payload data',  1008: 'Policy Violation',  1009: 'Message too big',  1010: 'Missing Extension',  1011: 'Internal Error',  1012: 'Service Restart',  1013: 'Try Again Later',  1014: 'Bad Gateway',  1015: 'TLS Handshake'};
export function getWSErrorString (code: number): string {  if (code >= 0 && code <= 999) {    return '(Unused)';  } else if (code >= 1016) {    if (code <= 1999) {      return '(For WebSocket standard)';    } else if (code <= 2999) {      return '(For WebSocket extensions)';    } else if (code <= 3999) {      return '(For libraries and frameworks)';    } else if (code <= 4999) {      return '(For applications)';    }  }
  return known[code] || '(Unknown)';}