import { FlatTreeControl } from '@angular/cdk/tree';
import { MatTreeFlattener } from '@angular/material/tree';
import { IFlatNodeObject, ITreeNode } from '../models/tree.models';
export declare class TreeUtils {
    static treeFlattener: MatTreeFlattener<ITreeNode<any>, IFlatNodeObject<any>, string | number>;
    static nodeTransformer(node: ITreeNode, level: number): {
        key: string;
        name: string;
        data: any;
        level: number;
        hasChildren: boolean;
    };
    static nodeBackTransformer(node: IFlatNodeObject): ITreeNode;
    static getNodeLevel({ level }: IFlatNodeObject): number;
    static getIsNodeExpandable({ hasChildren }: IFlatNodeObject): boolean;
    static getNodeChildren({ children }: ITreeNode): ITreeNode<any>[] | undefined;
    static getNodeByKey(key: string, level: number, treeControl: FlatTreeControl<IFlatNodeObject, string | number>): IFlatNodeObject<any>;
    static getParentNode(activeIndex: number, level: number, dataNodes: IFlatNodeObject[]): IFlatNodeObject<any> | null;
}
type TreeActionOptions = {
    emitEvent: boolean;
};
export declare const TREE_ACTION_DEFAULTS: TreeActionOptions;
export {};