import * as crypto from 'node:crypto';
import { Transform, type TransformCallback, type TransformOptions } from 'node:stream';
export declare class EncryptTransform extends Transform {
    private iv;
    private cipher;
    private ivSent;
    constructor(cipher: crypto.Cipher, iv: Buffer, opts?: TransformOptions);
    _transform(chunk: any, _encoding: BufferEncoding, callback: TransformCallback): void;
    _flush(callback: TransformCallback): void;
}