export declare class Node<T> {
    data: T;
    next: Node<T>;
    constructor(data: T);
}
export declare class LinkedList<T> {
    private _head;
    private length;
    constructor();
    readonly size: number;
    readonly head: Node<T>;
    add(data: T): void;
    remove(nodeData: T): void;
    addAt(index: number, data: T): void;
    removeAt(index: number): void;
    indexOf(nodeData: T): number;
    dataAt(index: number): T | number;
}