/// <reference types="node" />
/// <reference types="node" />
import { Transform, TransformCallback, TransformOptions } from "stream";
interface ProgressStreamOptions extends TransformOptions {
    /**
     * Optional callback to handle progress updates.
     * @param totalBytesTransferred - The total number of bytes transferred so far.
     */
    onProgress?: (totalBytesTransferred: number) => void;
}
export declare class ProgressStream extends Transform {
    private readonly onProgress;
    private totalBytes;
    constructor(options?: ProgressStreamOptions);
    _transform(chunk: Buffer, _encoding: BufferEncoding, callback: TransformCallback): void;
}
export {};