/**
 * A double-ended queue.
 *
 *
 * Example usage:
 *
 *  ```typescript
 *  const d = new Deque<number>(3);
 *  for (let i = 1; i <= 6; i++) {
 *    d.push(i);
 *    console.log(d.toArray());
 *  }
 * ```
 */
declare class Deque<T> {
    private buffer;
    maxlen: number;
    private head;
    private tail;
    size: number;
    constructor(array?: T[], maxlen?: number);
    get(index: number, d?: T): T | undefined;
    push(item: T): void;
    prepend(item: T): void;
    toArray(): T[];
    clear(): void;
}
export { Deque };