import { NestedTreeControl } from '@angular/cdk/tree';
import { ChangeDetectorRef, NgZone } from '@angular/core';
import { MatTreeNestedDataSource } from '@angular/material/tree';
import { Router } from '@angular/router';
import { RdsNavTreeItem } from './nav-tree-item.model';
import * as i0 from "@angular/core";
/**
 * Navigational tree component.
 *
 * Uses mat-tree component to display items their children. Uses NavTreeItem
 */
export declare class RdsNavTreeComponent {
    private cdr;
    private router;
    private zone;
    static ngAcceptInputType_items: RdsNavTreeItem[] | null | undefined;
    get items(): Array<RdsNavTreeItem>;
    set items(items: Array<RdsNavTreeItem>);
    private _items;
    dataSource: MatTreeNestedDataSource<RdsNavTreeItem>;
    treeControl: NestedTreeControl<RdsNavTreeItem>;
    constructor(cdr: ChangeDetectorRef, router: Router, zone: NgZone);
    hasChild(_: number, node: RdsNavTreeItem): boolean;
    /**
     * Toggles expansion of any tree nodes with an active child node
     */
    triggerExpansionCheck(): void;
    /**
     * Determines whether an item has an active child & should be expanded
     * @param item tree item to check whether it should be expanded
     * @returns whether the item has an active child
     */
    private _checkAndExpandItemChildren;
    private _updateChangeDetection;
    static ɵfac: i0.ɵɵFactoryDeclaration<RdsNavTreeComponent, never>;
    static ɵcmp: i0.ɵɵComponentDeclaration<RdsNavTreeComponent, "rds-c-nav-tree", never, { "items": "items"; }, {}, never, never>;
}