import { OnDestroy } from '@angular/core';
import { Observable } from 'rxjs';
import { NgControlService } from '../providers/ng-control.service';
import * as i0 from "@angular/core";
export declare enum CONTROL_STATE {
    NONE = "NONE",
    VALID = "VALID",
    INVALID = "INVALID"
}
export declare class IfControlStateService implements OnDestroy {
    private ngControlService;
    private subscriptions;
    private control;
    private _statusChanges;
    constructor(ngControlService: NgControlService);
    get statusChanges(): Observable<CONTROL_STATE>;
    ngOnDestroy(): void;
    triggerStatusChange(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<IfControlStateService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<IfControlStateService>;
}