/**
 * A Last-In-First-Out (LIFO) stack data structure.
 * @typeparam T - The type of elements stored in the stack
 */
export declare class Stack<T> {
    private top;
    /**
     * Adds an element to the top of the stack.
     * @param val - The value to add
     */
    push(val: T): void;
    /**
     * Removes the element from the top of the stack.
     * @throws Error if the stack is empty
     */
    pop(): void;
    /**
     * Returns the element at the top of the stack without removing it.
     * @returns The element at the top of the stack
     * @throws Error if the stack is empty
     */
    peek(): T;
    /**
     * Checks if the stack is empty.
     * @returns True if the stack contains no elements, false otherwise
     */
    isEmpty(): boolean;
    /**
     * Returns the number of elements in the stack.
     * @returns The size of the stack
     */
    size(): number;
}
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