export declare const DEFAULT_QUEUE_CONCURRENCY = 10;
export interface YQueueOptions {
    concurrency?: number;
}
export interface EnqueueOptions {
    priority: number;
}
export declare type Task<TaskResultType> = (() => PromiseLike<TaskResultType>) | (() => TaskResultType);
export declare class YQueue {
    readonly options?: YQueueOptions | undefined;
    private readonly semaphore;
    readonly concurrency: number;
    private onIdleWaits;
    private onQueueLessThanWaits;
    constructor(options?: YQueueOptions | undefined);
    run<TaskResultType>(fn: Task<TaskResultType>, options?: Partial<EnqueueOptions>): Promise<TaskResultType>;
    add<TaskResultType>(fn: Task<TaskResultType>, options?: Partial<EnqueueOptions>): void;
    onIdle(): Promise<void>;
    onQueueSizeLessThan(size: number): Promise<void>;
}
export default YQueue;