/**
 * ThreadPool — Manages a pool of Worker Threads for parallel CSV parsing.
 *
 * Design decisions:
 *   1. Warm pool: workers are created ONCE and reused across tasks.
 *      Creating workers is expensive (~10ms each), so we pre-warm them.
 *
 *   2. Ordered results: results are collected per-taskId and yielded
 *      in original order, even if workers complete out of order.
 *
 *   3. Header broadcast: worker 0 reads the header row and broadcasts
 *      it to all other workers before they start processing.
 *
 *   4. Graceful shutdown: destroy() terminates all workers cleanly.
 */
import type { BatchResult } from "../types/index.js";
import type { CsvSuperProOptions } from "../types/index.js";
export interface ByteRange {
    start: number;
    end: number;
}
export declare class ThreadPool {
    private readonly threadCount;
    private readonly filePath;
    private readonly options;
    private readonly workers;
    private headersCache;
    private headersPromise;
    private headersResolve;
    constructor(threadCount: number, filePath: string, options: CsvSuperProOptions);
    /**
     * Initialize worker pool
     */
    initialize(): Promise<void>;
    process(ranges: ByteRange[], batchSize: number): AsyncGenerator<BatchResult>;
    destroy(): Promise<void>;
    get activeWorkers(): number;
}
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