import { Loggable } from '../../logger/loggable.js';
export type QueueItem = () => void | Promise<void>;
export declare class ParallelQueue extends Loggable {
    private readonly _queues;
    private _inProgress;
    private _currentIndex;
    private _maxIndex;
    private readonly _beforePriorityRun;
    private readonly _afterPriorityRun;
    private readonly _finished;
    get currentPriority(): number;
    get inProgress(): boolean;
    get beforePriorityRun(): import("../../observing/event.js").IEvent<number>;
    get afterPriorityRun(): import("../../observing/event.js").IEvent<number>;
    get finished(): import("../../observing/event.js").IEvent<any>;
    protected getLoggerName(name: string | undefined): string;
    /** @returns A callback that will try to cancel queued item */
    enqueue(cb: QueueItem, priority?: number): () => void;
    start(): Promise<boolean | undefined>;
    private getQueue;
    private tryStartQueue;
    private _executeLoader;
}