import { ModalRef } from './modal-ref';
import * as i0 from "@angular/core";
export declare class ModalStackService {
    private _stack;
    register(ref: ModalRef): void;
    unregister(ref: ModalRef): void;
    /** Instantly closes all open modals */
    closeAll(): void;
    get activeCount(): number;
    static ɵfac: i0.ɵɵFactoryDeclaration<ModalStackService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ModalStackService>;
}