@shko.online/dataverse-odata/lib/cjs/validators/atMostOnce.js

This package will help parse OData strings (only the Microsoft Dataverse subset). It can be used as a validator, or you can build some javascript library which consumes the output of this library.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.atMostOnce = void 0;
/**
 * Options of this type must be specified at most once.
 * @param option The option being validated (ex. $top)
 * @param value The result of {@link URLSearchParams.getAll getAll}
 * @param result The {@link ODataQuery} to append the error to
 * @returns {boolean} Returns `false` when the parse has an error
 */
const atMostOnce = (option, value, result) => {
  if (value.length > 1) {
    result.error = {
      code: '0x0',
      message: `Query option '${option}' was specified more than once, but it must be specified at most once.`
    };
    return false;
  }
  return true;
};
exports.atMostOnce = atMostOnce;