/**
 * instanceof validation core module
 * Provides a validator that checks whether a value is an instance of a
 * specific constructor, including subclasses. The validator is exported as
 * `instanceOf` because `instanceof` is a reserved keyword in JavaScript.
 */
import { type StandardSchemaV1 } from "../../Validate/standardSchema";
import type { ValidateCoreReturnType } from "../../Validate/type";
export type Constructor<T> = new (...arguments_: any[]) => T;
/**
 * Creates a validator that checks whether a value is an instance of the given
 * constructor. Subclasses of the constructor satisfy the validator, matching
 * native `instanceof` semantics.
 * @template T - The instance type produced by the constructor
 * @param {Constructor<T>} classConstructor - Constructor whose instances are accepted
 * @param {string} [message] - Custom error message for validation failure
 * @returns {Function} - Validator function for instances of the constructor
 */
export declare const instanceOf: <T>(classConstructor: Constructor<T>, message?: string) => ((value: T) => ValidateCoreReturnType<T>) & StandardSchemaV1<T, T>;