import { ValidatorFn } from "@angular/forms";
import * as i0 from "@angular/core";
export interface NgtReactiveSelectValidationConfig {
    isRequired: boolean;
    customSyncValidators?: ValidatorFn[];
}
export declare class NgtReactiveSelectValidationService {
    getSyncValidators(config: NgtReactiveSelectValidationConfig): ValidatorFn[];
    private isRequiredValidator;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgtReactiveSelectValidationService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgtReactiveSelectValidationService>;
}