/**
 * Return true if `value1` and `value2` form a valid Unix range — both finite numbers
 * and `value1 <= value2`.
 *
 * - Both inputs must be numbers (or numeric strings that coerce to finite numbers).
 * - Equal `value1 === value2` is valid when `options.allowEqual` is true.
 * - Non-finite values (NaN, Infinity) return `false`.
 *
 * @param value1 first Unix epoch value (seconds or milliseconds)
 * @param value2 second Unix epoch value (seconds or milliseconds)
 * @param options optional allowEqual flag
 * @returns boolean indicating whether the Unix range is valid
 *
 * @example isValidUnixRange({ value1: 0, value2: 1700000000 }) // true
 * @example isValidUnixRange({ value1: 1700000000, value2: 0 }) // false
 * @example isValidUnixRange({ value1: 1000, value2: 1000, options: { allowEqual: true } }) // true
 */
export declare function isValidUnixRange({ value1, value2, options, }: {
    value1: number | string;
    value2: number | string;
    options?: {
        allowEqual?: boolean;
    };
}): boolean;