import { RendererFactory2 } from '@angular/core';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class ManagedFocusContainerService {
    readonly rendererFactory: RendererFactory2;
    private _containers;
    private readonly _renderer;
    constructor();
    /**
     * Create or get an existing object which manages the tabindex of descendants.
     * @param element The element containing focusable descendants.
     * @param component The component requesting the managed focus container.
     */
    register(element: HTMLElement, component: unknown): void;
    /**
     * Remove the container object. This will call `unregister` on the container if `component` is the last reference
     * to it.
     * @param element The element containing focusable descendants.
     * @param component The component requesting the managed focus container.
     */
    unregister(element: HTMLElement, component: unknown): void;
    /**
     * Get an observable which can be used to determine when the element or one of its descendants has focus.
     * @param element The element containing focusable descendants.
     */
    hasFocus(element: HTMLElement): Observable<boolean>;
    private getContainer;
    static ɵfac: i0.ɵɵFactoryDeclaration<ManagedFocusContainerService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ManagedFocusContainerService>;
}