import { TypeOverride } from "@plumier/reflect";
import { VisitorInvocation } from './invocation';
import { Result } from './visitor';
declare const RequiredValidator: unique symbol;
declare const PartialValidator: unique symbol;
declare type Validator = (val: any) => string | undefined;
interface ValidatorDecorator {
    type: "tc:validator";
    validator: Validator | string | symbol;
}
declare function createValidation(validator: Validator | string | symbol): import("@plumier/reflect").CustomPropertyDecorator;
declare function required(): import("@plumier/reflect").CustomPropertyDecorator;
declare function partial(type: TypeOverride | ((x: any) => TypeOverride)): (...args: any[]) => void;
declare function validatorVisitor(i: VisitorInvocation): Result;
export { createValidation, required, partial, validatorVisitor, Validator, ValidatorDecorator, PartialValidator, RequiredValidator };