import { InjectionToken } from '@angular/core';
import { OverlayRef } from '@angular/cdk/overlay';
import { Observable } from 'rxjs';
export declare class CustomEditStepRef<TResult = string | undefined> {
    private readonly overlayRef;
    private readonly closed$;
    private isClosed;
    constructor(overlayRef: OverlayRef);
    close(result?: TResult): void;
    afterClosed(): Observable<TResult | undefined>;
    private finishClose;
}
export declare const CUSTOM_EDIT_STEP_REF: InjectionToken<CustomEditStepRef<string>>;