import { BaseCollection } from "./base-collection";
export interface Stack<T> {
    push(element: T): void;
    pop(): T | undefined;
    top(): T | undefined;
}
export declare class Stack<T> extends BaseCollection<T> implements Stack<T> {
    private llData;
    constructor();
    /**
     * Checks if the stack is empty. Returns true if the stack is empty, false otherwise.
     */
    isEmpty(): boolean;
    /**
     * Returns the number of elements in the stack. The size of the stack
     */
    size(): number;
    /**
     * Removes all elements from the stack.
     */
    clear(): void;
    /**
     * Checks if two stacks are equal.
     */
    equals(other: Stack<T>): boolean;
}