import type { Constructor, PropOptionsGenerator } from '../types';
import type { Validator } from '../validators';
/**
 * Allows instances of the given constructor (validated at runtime and compile time).
 *
 * @template T - can be used to adjust the inferred type at compile time.
 * @param parent - The constructor to allow.
 * @param validator - Optional function for further runtime validation; should return `undefined` if valid, or an error string if invalid.
 */
export declare const instanceOfProp: <T extends Constructor>(parent: T, validator?: Validator) => PropOptionsGenerator<InstanceType<T>>;