import { Observable } from 'rxjs';
export declare abstract class NcModalComponent<I = void, O = void> {
    data: I;
    result: O;
    /**
     * "Soft close" hook which is called whenever the modal is being closed
     * by "Escape" key or Backdrop click.
     * Return true to permit closing. False - to refuse.
     */
    onSoftClose(): boolean | Observable<boolean>;
}