/// <reference types="node" />
import { EventEmitter } from "events";
import CucumberHtmlStream from "@cucumber/html-formatter";
import messages from "@cucumber/messages";
export declare function createHtmlStream(): CucumberHtmlStream;
export declare function createJsonFormatter(envelopes: messages.Envelope[], log: (chunk: string) => void): EventEmitter;
export declare function createPrettyFormatter(useColors: boolean, log: (chunk: string) => void): EventEmitter;