import "./asyncIterable";
/**
 * An asynchronous queue with a bounded endpoint.
 */
export declare class AsyncBoundedQueue<T> {
    private _queue;
    private _state;
    /**
     * Initializes a new instance of the AsyncProducerConsumerQueue class.
     *
     * @param iterable An optional iterable of values or promises.
     */
    constructor(iterable?: Iterable<T | PromiseLike<T>>);
    /**
     * Gets the number of entries in the queue.
     * When positive, indicates the number of entries available to get.
     * When negative, indicates the number of requests waiting to be fulfilled.
     */
    get size(): number;
    /**
     * Adds a value to the end of the queue. If the queue is empty but has a pending
     * dequeue request, the value will be dequeued and the request fulfilled.
     *
     * @param value A value or promise to add to the queue.
     */
    put(value: T | PromiseLike<T>): void;
    /**
     * Indicates the queue is done adding and that no more items will be added to the queue.
     */
    end(): void;
    /**
     * Removes and returns a Promise for the first value in the queue. If the queue has
     * ended, returns a Promise for `undefined`. If the queue is empty, returns a Promise
     * for the next value to be added to the queue.
     */
    get(): Promise<T | undefined>;
    /**
     * Consumes all items in the queue until the queue ends.
     */
    drain(): AsyncIterableIterator<T>;
    private _dequeue;
}