import { BaseCollection } from './base-collection';
export interface Queue<T> {
    push(element: T): void;
    pop(): T | undefined;
    front(): T | undefined;
}
export declare class Queue<T> extends BaseCollection<T> implements Queue<T> {
    private items;
    constructor();
    /**
     * Checks if the queue is empty. Returns true if the queue is empty, false otherwise.
     */
    isEmpty(): boolean;
    /**
     * Returns the number of elements in the queue.
     */
    size(): number;
    /**
     * Removes all elements from the queue.
     */
    clear(): void;
    /**
     * Checks if two queues are equal.
     */
    equals(other: Queue<T>): boolean;
}