import { EventEmitter, Injector } from '@angular/core';
import { NgbModalOptions } from './modal-config';
import { NgbModalRef } from './modal-ref';
import * as i0 from "@angular/core";
export declare class NgbModalStack {
    private _applicationRef;
    private _injector;
    private _environmentInjector;
    private _document;
    private _scrollBar;
    private _activeWindowCmptHasChanged;
    private _ariaHiddenValues;
    private _scrollBarRestoreFn;
    private _modalRefs;
    private _windowCmpts;
    private _activeInstances;
    constructor();
    private _restoreScrollBar;
    private _hideScrollBar;
    open(contentInjector: Injector, content: any, options: NgbModalOptions): NgbModalRef;
    get activeInstances(): EventEmitter<NgbModalRef[]>;
    dismissAll(reason?: any): void;
    hasOpenModals(): boolean;
    private _attachBackdrop;
    private _attachWindowComponent;
    private _getContentRef;
    private _createFromTemplateRef;
    private _createFromString;
    private _createFromComponent;
    private _setAriaHidden;
    private _revertAriaHidden;
    private _registerModalRef;
    private _registerWindowCmpt;
    static ɵfac: i0.ɵɵFactoryDeclaration<NgbModalStack, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<NgbModalStack>;
}