export declare class Queque<T> {
    private head?;
    private tail?;
    private _length;
    get length(): number;
    enqueue(value: T): void;
    dequeue(): Undefined<T>;
    static fromArray<T>(collection: T[]): Queque<T>;
    static map<T, V>(collection: T[], map: (element: T) => V): Queque<V>;
}