export declare class AsyncBoundedQueue<T> {
    private readonly capacity;
    private readonly items;
    private dequeueResolvers;
    private enqueueResolvers;
    private closed;
    private cancelled;
    private dropped;
    constructor(capacity: number);
    enqueue(item: T): Promise<boolean>;
    dequeue(): Promise<T | undefined>;
    close(): void;
    cancel(): void;
    size(): number;
    isClosed(): boolean;
    isCancelled(): boolean;
    getDroppedCount(): number;
    private notifyProducer;
    private flushResolvers;
}