import { type OnChanges } from '@angular/core';
import { type Validator, Validators } from '@angular/forms';
import * as i0 from "@angular/core";
export declare class TuiValidator implements Validator, OnChanges {
    protected onChange: (...args: any[]) => void;
    validate: typeof Validators.nullValidator;
    registerOnValidatorChange(onChange: (...args: any[]) => void): void;
    ngOnChanges(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<TuiValidator, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TuiValidator, "[tuiValidator]", never, { "validate": { "alias": "tuiValidator"; "required": false; }; }, {}, never, never, true, never>;
}