import type { OnDestroy } from '@angular/core';
import type { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class TuiActiveZone implements OnDestroy {
    private readonly control;
    private readonly active$;
    private readonly zone;
    private readonly el;
    private tuiActiveZoneParent;
    private subActiveZones;
    private readonly directParentActiveZone;
    readonly tuiActiveZoneChange: Observable<boolean>;
    constructor();
    set tuiActiveZoneParentSetter(zone: TuiActiveZone | null);
    ngOnDestroy(): void;
    contains(node: Node): boolean;
    private setZone;
    private addSubActiveZone;
    private removeSubActiveZone;
    static ɵfac: i0.ɵɵFactoryDeclaration<TuiActiveZone, never>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<TuiActiveZone, "[tuiActiveZone]:not(ng-container), [tuiActiveZoneChange]:not(ng-container), [tuiActiveZoneParent]:not(ng-container)", ["tuiActiveZone"], { "tuiActiveZoneParentSetter": { "alias": "tuiActiveZoneParent"; "required": false; }; }, { "tuiActiveZoneChange": "tuiActiveZoneChange"; }, never, never, true, never>;
}