import type { URL } from "url";
import type { WorkerOptions } from "worker_threads";
import { Worker } from "worker_threads";
export declare class WorkersPool<TInput, TResult> {
    workersCount: number;
    fileName: string | URL;
    workerOptions: WorkerOptions | undefined;
    workers: Map<number, Worker>;
    protected promises: Map<number, Promise<[workerIndex: number, itemIndex: number, input: TInput, result: TResult]>>;
    protected constructor(workersCount: number, fileName: string | URL, workerOptions: WorkerOptions | undefined, workers: Map<number, Worker>);
    static initialize<TInput, TResult>(workersCount: number, fileName: string | URL, workerOptions?: WorkerOptions): Promise<WorkersPool<TInput, TResult>>;
    run(items: AsyncIterable<TInput>): AsyncIterable<[itemIndex: number, input: TInput, result: TResult]>;
    unref(): void;
}