/**
 * Validates whether two values are eligible for comparison using >= or <= operators.
 *
 * Supported types: `undefined`, `number`, `bigint`, and `Date`.
 *
 * @param a - The first value to compare.
 * @param b - The second value to compare.
 *
 * @returns {boolean} True if both values are of supported types.
 *
 * @throws {TypeError} If either value is of an unsupported type.
 * @memberOf module:decorator-validation
 */
export declare function isValidForGteOrLteComparison(a: any, b: any): boolean;
/**
 * @summary Compares two values to determine if the first is less than the second.
 * @description Supports numbers and dates. Throws an error for unsupported types.
 *
 * @param {any} a - The first value to compare.
 * @param {any} b - The second value to compare against.
 *
 * @returns {boolean} True if `a` is less than `b`, false otherwise.
 *
 * @throws {Error} If either `a` or `b` is `null` or `undefined`.
 * @throws {TypeError} If values are of mismatched or unsupported types.
 * @memberOf module:decorator-validation
 */
export declare function isLessThan(a: any, b: any): boolean;
/**
 * Checks if `a` is greater than `b`.
 * Supports comparison for numbers and Date objects.
 *
 * @param {any} a - The value to validate.
 * @param {any} b - The value to compare against.
 *
 * @returns {boolean} True if `a` is greater than `b`, otherwise false.
 *
 * @throws {Error} If either `a` or `b` is `null` or `undefined`.
 * @throws {TypeError} If values are of mismatched or unsupported types.
 * @memberOf module:decorator-validation
 */
export declare function isGreaterThan(a: any, b: any): boolean;