/**
 * Simple queue in which the elements are always sorted
 */
export default class SortedQueue<ItemType> {
    queue: ItemType[];
    compareFunc: (left: ItemType, right: ItemType) => number;
    /**
     * @constructs SortedQueue
     * @param {Function} compareFunc comparison function used for sorting the elements of the queue
     */
    constructor(compareFunc: (left: ItemType, right: ItemType) => number);
    /**
     * Removes all of the elements from queue.
     * @returns {undefined}
     */
    clear(): void;
    /**
     * Inserts the specified element into the queue.
     * @param {object} item
     * @returns {undefined}
     */
    enqueue(item: ItemType): void;
    /**
     * Returns and removes the head of the queue.
     * Returns null if the queue is empty.
     * @returns {(object|null)} Queue item or null.
     */
    dequeue(): ItemType;
    /**
     * Returns the number of items in queue.
     * @returns {number}
     */
    size(): number;
}