import { NgControl } from '@angular/forms';
import { RadioButtonComponent } from '../radio-button/radio-button.component';
import * as i0 from "@angular/core";
export declare class RadioButtonRegistryService {
    private componentRefs;
    add(control: NgControl, componentInstance: RadioButtonComponent): void;
    remove(componentInstance: RadioButtonComponent): void;
    select(componentInstance: RadioButtonComponent): void;
    private isSameGroup;
    static ɵfac: i0.ɵɵFactoryDeclaration<RadioButtonRegistryService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<RadioButtonRegistryService>;
}