export declare class Node<T> {
    data: T;
    left: Node<T>;
    right: Node<T>;
    constructor(data: T, left?: Node<T>, right?: Node<T>);
}
export declare class BST<T> {
    root: Node<T>;
    constructor(root?: Node<T>);
    add(data: T): void;
    findMin(): T;
    findMax(): T;
    find(data: T): Node<T>;
    isPresent(data: T): boolean;
    remove(data: T): void;
    isBalanced(): boolean;
    findMinHeight(node?: Node<T>): number;
    findMaxHeight(node?: Node<T>): number;
    inOrder(): Array<T>;
    preOrder(): Array<T>;
    postOrder(): Array<T>;
    levelOrder(): Array<T>;
    layers(): Array<T>;
    invert(): void;
    elementHeight(data: T): number;
    elementDepth(data: T): number;
}