/**
 * ProgressTracker — Tracks read progress and computes speed/ETA.
 *
 * Uses a sliding window (last 1 second) for accurate speed calculation
 * instead of a naive total-bytes / total-time average.
 * This gives accurate readings even when I/O speed varies mid-file.
 */
import type { ProgressInfo } from '../types/index.js';
export declare class ProgressTracker {
    private readonly totalBytes;
    private readonly encoding;
    private readonly callback;
    private bytesRead;
    private rowsProcessed;
    private readonly window;
    private startTime;
    constructor(totalBytes: number, encoding: BufferEncoding, callback?: ((info: ProgressInfo) => void) | null);
    /**
     * Called each time a chunk is read from disk.
     * @param chunkByteLength  Byte size of the chunk.
     */
    onChunk(chunkByteLength: number): void;
    /**
     * Update the row count (called by BatchController or main loop).
     * @param count  Number of rows just processed.
     */
    addRows(count: number): void;
    /**
     * Called when the file is fully read.
     * Fires one final callback with 100% completion.
     */
    complete(): void;
}
//# sourceMappingURL=progress-tracker.d.ts.map