import type { PassThrough as NodePassThrough, TransformCallback } from 'node:stream';
import type { TransformOptions } from './transform.js';
import { Transform } from './transform.js';
/** The most minimal Transform: every chunk written comes back out unchanged. */
export declare class PassThrough extends Transform implements NodePassThrough {
    constructor(options?: TransformOptions);
    _transform(chunk: any, encoding: BufferEncoding, callback: TransformCallback): void;
}