/// <reference types="node" />
import { PassThrough, Readable, Stream } from 'stream';
export declare class StreamHelper {
    static string2Stream(text: string, encoding?: string): PassThrough;
    static stream2String(stream: Stream, encoding?: string): Promise<string>;
    static buffer2Stream(buffer: Buffer): PassThrough;
    static stream2Buffer(stream: Stream): Promise<Buffer>;
    static urlReadableStream(url: string): Promise<Readable>;
}