export declare class Tree<T> {
    left: Tree<T> | null;
    right: Tree<T> | null;
    root?: Tree<T>;
    list: Tree<T>[];
    private data;
    constructor(data: T, left?: Tree<T>, right?: Tree<T>);
    create(list: T[]): void;
    preOrder(root: Tree<T> | null): void;
    inOrder(root: Tree<T> | null): void;
    afterOrder(root: Tree<T> | null): void;
}