/**
 * `Node` is a container for the value of an item inside of a `Queue`
 */
export declare class Node<T> {
    value: T;
    next: Node<T> | null;
    constructor(value: T, next: Node<T> | null);
}
export declare class Queue<T> {
    private header;
    constructor();
    get length(): number;
    push(value: T): void;
    unshift(value: T): void;
    pop(): T | undefined;
    shift(): T | undefined;
    [Symbol.iterator]: () => {
        next: () => {
            done: boolean;
            value: undefined;
        } | {
            done: boolean;
            value: T;
        };
    };
}