/**
 * Circular buffer implementation for O(1) push/shift operations
 * Based on denque's design for high-performance queue operations
 */
export declare class Queue<T> {
    private head;
    private tail;
    private capacityMask;
    private list;
    push(item: T): void;
    shift(): T | undefined;
    isEmpty(): boolean;
    length(): number;
    private growArray;
    private shrinkArray;
}