import * as i0 from "@angular/core";
export declare class VerticalNavGroupRegistrationService {
    navGroupCount: number;
    registerNavGroup(): void;
    unregisterNavGroup(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<VerticalNavGroupRegistrationService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<VerticalNavGroupRegistrationService>;
}