import { Observable, Subject } from 'rxjs';
import { GdkNavigationItem } from '../types';
export declare class GdkNavigationService {
    onItemCollapsed: Subject<any>;
    onItemCollapseToggled: Subject<any>;
    private _onNavigationChanged;
    private _onNavigationRegistered;
    private _onNavigationUnregistered;
    private _currentNavigationKey;
    private _registry;
    constructor();
    readonly onNavigationChanged: Observable<any>;
    readonly onNavigationRegistered: Observable<any>;
    readonly onNavigationUnregistered: Observable<any>;
    register(key: any, navigation: any): void;
    unregister(key: any): void;
    getNavigation(key: any): any;
    checkIsKeyNavigation(key: any): boolean;
    getFlatNavigation(navigation: any, flatNavigation?: GdkNavigationItem[]): any;
    getCurrentNavigation(): any;
    setCurrentNavigation(key: any): void;
    getNavigationItem(id: any, navigation?: any): any | boolean;
    getNavigationItemParent(id: any, navigation?: any, parent?: any): any;
    addNavigationItem(item: any, id: any): void;
    removeNavigationItem(id: any): void;
}