/**
 * Checks whether a string is a valid non-negative integer.
 *
 * @see https://html.spec.whatwg.org/dev/common-microsyntaxes.html#non-negative-integers
 *
 * @param value - The string to validate
 * @param options - Optional constraints; use `gt` to require a value greater than the specified number
 * @returns Whether the value is a valid non-negative integer within the constraints
 */
export declare function isUint(value: string, options?: {
    readonly gt?: number;
}): boolean;