export declare class ObjectPool<T> {
    private factory;
    private reset;
    private free;
    private count;
    constructor(factory: () => T, reset?: (item: T) => void, initialSize?: number);
    acquire(): NonNullable<T>;
    release(item: T): void;
    expand(count: number): void;
    get size(): number;
    get freeCount(): number;
    get usedCount(): number;
    destory: () => void;
}