import { OverlayRef } from '@angular/cdk/overlay';
import { Modal } from './modal';
import { ModalStackService } from './modal-stack.service';
export declare class ModalRef<R = any> {
    private overlay;
    modal: Modal;
    private stack;
    private readonly _afterClosed$;
    afterClosed$: import("rxjs").Observable<R | null | undefined>;
    constructor(overlay: OverlayRef, modal: Modal, stack: ModalStackService);
    /**
     * Closes the modal instantly.
     * @param result Data to pass back to the caller
     */
    close(result?: R): void;
}