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 active$;
    private tuiActiveZoneParent;
    private readonly parent;
    private readonly el;
    readonly tuiActiveZoneChange: Observable<boolean>;
    children: readonly TuiActiveZone[];
    constructor();
    set tuiActiveZoneParentSetter(zone: TuiActiveZone | null);
    ngOnDestroy(): void;
    contains(node: Node): boolean;
    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>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TuiActiveZone>;
}