export declare class Stack<T> {
    storage: {
        [key: number]: T;
    };
    length: number;
    constructor();
    push(value: T): void;
    pop(): T | null;
    peek(): T;
    clear(): void;
    isEmpty(): boolean;
    print(): void;
    insertAtBottom(stack: Stack<T>, item: T): void;
    reverse(stack: Stack<T>): void;
    sort(stack: Stack<T>): void;
    sortedInsert(stack: Stack<T>, item: T): void;
}