import { Readable, Duplex } from 'stream';
import sinon from 'sinon';
export declare const getContext: () => {
    logger: any;
    emit: sinon.SinonSpy<any[], any>;
};
export declare const encryptStream: () => Duplex;
export declare const decryptStream: () => Duplex;
export declare const zip: () => Duplex;
export declare const unzip: () => Duplex;
export declare const streamFromObject: (data: object) => Readable;