import { OverlayRef } from '@angular/cdk/overlay';
import { EventEmitter } from '@angular/core';
import * as i0 from "@angular/core";
export declare class ContextMenuOverlaysService {
    /**
     * Emits when all context menus are closed
     */
    allClosed: EventEmitter<void>;
    private stack;
    /**
     * Add an item to the stack
     */
    push(value: OverlayRef): void;
    /**
     * Clear the whole stack
     */
    closeAll(): void;
    isEmpty(): boolean;
    private dispose;
    static ɵfac: i0.ɵɵFactoryDeclaration<ContextMenuOverlaysService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ContextMenuOverlaysService>;
}