/**
 * Boolean validation core module
 * Provides the base validation functionality for boolean values
 */
import { type StandardSchemaV1 } from "../../Validate/standardSchema";
import type { ValidateCoreReturnType } from "../../Validate/type";
/**
 * Creates a boolean validator
 * @param {string} [message] - Custom error message for type validation
 * @returns {Function} - Validator function that checks if the value is a boolean
 */
export declare const boolean: (message?: string) => ((value: boolean) => ValidateCoreReturnType<boolean>) & StandardSchemaV1<boolean, boolean>;