import { OverlayRef } from '@angular/cdk/overlay';
import { SheetContainer } from './sheet-container.component';
import { Observable } from 'rxjs';
export declare class SheetRef {
    private overlayRef;
    componentInstance: SheetContainer;
    private _beforeClose;
    private _afterClosed;
    private _result;
    constructor(overlayRef: OverlayRef);
    close(data?: any): void;
    afterClosed(): Observable<any | undefined>;
    beforeClose(): Observable<any | undefined>;
}