import { Observable } from 'rxjs';
export declare class NbSidebarService {
    private toggle$;
    private expand$;
    private collapse$;
    onToggle(): Observable<{
        compact: boolean;
        tag: string;
    }>;
    onExpand(): Observable<{
        tag: string;
    }>;
    onCollapse(): Observable<{
        tag: string;
    }>;
    toggle(compact?: boolean, tag?: string): void;
    expand(tag?: string): void;
    collapse(tag?: string): void;
}