export declare class Stack<T> {
    private store;
    constructor();
    count(): number;
    push(val: T): void;
    pop(): T | undefined;
    /**
     * Peek returns the element (n) far in the stack beginning from
     * the top of the stack.
     * 	n = 0 => will return the element on top of the stack.
     */
    peek(n: number): T | undefined;
    /**
     * TODO: check if properly implemented.
     * @param index
     * @param t
     */
    insert(index: number, t: T | undefined): void;
    remove(index: number): T | undefined;
    /**
     * Beware the index is from the end
     * @param index
     * @param t
     */
    set(index: number, t: T): void;
    swap(i: number, j: number): void;
    copyTo(stack: Stack<T>): void;
}