readable-stream-clone/src/readable-stream-clone.ts

readable stream cloner

import { Readable, Writable, ReadableOptions  }  from 'stream';

export class ReadableStreamClone extends Readable {
    
    constructor(readableStream: Readable, options?: ReadableOptions){
        super(options);  
        readableStream.on("data", (chunk) => {
            this.push(chunk);
        });

        readableStream.on('end', () => {
            this.push(null);
        });

        readableStream.on("error", (err) => {
            this.emit("error", err);
        });
    }
    public _read(){}
}


export const promisifyWriteStreams = async (writableStreams : Writable[]) => {
    return Promise.all(writableStreams.map((writable : Writable) => {
        return promisifyWriteStream(writable);
    }))
}

export const promisifyWriteStream = async (writableStream : Writable) => {
    return new Promise((resolve, reject) => {
        writableStream.on('finish', () => {
            resolve(null);
        })
        writableStream.on('error', (err) => {
            reject(err);
        })
    })
}

export default ReadableStreamClone;
// NodeJS support
module.exports.default = ReadableStreamClone;