export declare class Queue<T> {
    private linkedList;
    /**
     * Creates new Queue instance
     */
    constructor();
    /**
     * Adds new element to queue
     * @param {T} element element to be added
     */
    enqueue(element: T): void;
    /**
     * Removes first element from queue that needs to be served
     * and returns its value
     * @returns {T} element to be served
     */
    dequeue(): T;
    /**
     * Returns first item in the queue
     * @returns {T} value of the first item
     */
    first(): T;
    /**
     * Returns true if stack is empty, false otherwise
     * @returns {boolean} true if stack is empty
     */
    isEmpty(): boolean;
    /**
     * Returns size of the stack
     * @returns {number} size of the stack
     */
    getSize(): number;
}