export type Priority = 'high' | 'normal' | 'low';
export interface PriorityQueueItem<T> {
    id: string;
    priority: Priority;
    data: T;
    timestamp: number;
    resolve: (value: any) => void;
    reject: (error: Error) => void;
}
export declare class QueryPriorityQueue<T = any> {
    private highPriorityQueue;
    private normalPriorityQueue;
    private lowPriorityQueue;
    private processing;
    private concurrency;
    private activeCount;
    private processor;
    constructor(concurrency: number | undefined, processor: (item: T) => Promise<any>);
    enqueue(data: T, priority?: Priority): Promise<any>;
    private processQueue;
    private dequeue;
    private hasItems;
    getStats(): {
        high: number;
        normal: number;
        low: number;
        total: number;
        active: number;
        concurrency: number;
    };
    clear(): void;
    size(): number;
    isEmpty(): boolean;
}
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