/** A single queued task with resolve/reject handlers and a unique id. */
export interface QueueItem {
    id: string;
    reject: (error: Error) => void;
    resolve: (value: any | PromiseLike<any>) => void;
    task: () => Promise<any>;
}
/** Queue that evaluates a fixed number of promises concurrently, deduplicating by id. */
export declare class PromiseQueue {
    private maxConcurrent;
    private queue;
    private runningPromises;
    private uniqueItemsSet;
    constructor(maxConcurrent?: number);
    addRequest<TValue>(task: QueueItem['task'], id: string): Promise<TValue>;
    private processQueue;
}
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