How to use the node-opcua-basic-types.isValidUInt16 function in node-opcua-basic-types

intervalVariable.on("value_changed", function(dataValue/*,indexRange*/) {
        const variant = dataValue.value;
        assert(variant instanceof Variant);
        assert(ec.isValidUInt16(variant.value) && " value must be valid for dataType");
        interval = variant.value;
        install_Timer();
    });

assert(value === null || !(value instanceof Uint32Array));
    switch (dataType) {
        case DataType.NodeId:
            return ec.isValidNodeId(value);
        case DataType.String:
            return typeof value === "string" || utils.isNullOrUndefined(value);
        case DataType.Int64:
            return ec.isValidInt64(value);
        case DataType.UInt64:
            return ec.isValidUInt64(value);
        case DataType.UInt32:
            return ec.isValidUInt32(value);
        case DataType.Int32:
            return ec.isValidInt32(value);
        case DataType.UInt16:
            return ec.isValidUInt16(value);
        case DataType.Int16:
            return ec.isValidInt16(value);
        case DataType.Byte:
            return ec.isValidUInt8(value);
        case DataType.SByte:
            return ec.isValidInt8(value);
        case DataType.Boolean:
            return ec.isValidBoolean(value);
        case DataType.ByteString:
            return ec.isValidByteString(value);
        default:
            return true;
    }
}

assert(value === null || !(value instanceof Uint32Array));
  switch (dataType) {
    case DataType.NodeId:
      return isValidNodeId(value);
    case DataType.String:
      return typeof value === "string" || utils.isNullOrUndefined(value);
    case DataType.Int64:
      return isValidInt64(value);
    case DataType.UInt64:
      return isValidUInt64(value);
    case DataType.UInt32:
      return isValidUInt32(value);
    case DataType.Int32:
      return isValidInt32(value);
    case DataType.UInt16:
      return isValidUInt16(value);
    case DataType.Int16:
      return isValidInt16(value);
    case DataType.Byte:
      return isValidUInt8(value);
    case DataType.SByte:
      return isValidInt8(value);
    case DataType.Boolean:
      return isValidBoolean(value);
    case DataType.ByteString:
      return isValidByteString(value);
    default:
      return true;
  }
}