import { NodeOrNull } from './types';
declare type TraverseReturn = void | boolean | Array<NodeOrNull>;
declare class Tree {
    root: NodeOrNull;
    constructor(root?: NodeOrNull);
    private _traverse;
    private _traverseBreathFirst;
    private _traverseDepthFirst;
    traverseBreathFirst(fn: Function): TraverseReturn;
    traverseDepthFirst(fn: Function): TraverseReturn;
    someBreathFirst(fn: Function): boolean;
    someDepthFirst(fn: Function): boolean;
    everyBreathFirst(fn: Function): boolean;
    everyDepthFirst(fn: Function): boolean;
    findOneBreathFirst(fn: Function): NodeOrNull;
    findOneDepthFirst(fn: Function): NodeOrNull;
    findAllBreathFirst(fn: Function): Array<NodeOrNull>;
    findAllDepthFirst(fn: Function): Array<NodeOrNull>;
    flatMap(fn?: Function | null): Array<any>;
    flattenData(): Array<any>;
    flattenByHeight(fn?: Function | null): any[][];
    flattenDataByHeight(): any[][];
    widthsByHeight(): Array<number>;
    nodesAtHeight(height: number): Array<NodeOrNull>;
    countNodes(): number;
    maxWidth(): number;
    height(): number;
    toJson(): string;
}
export default Tree;