Concatenate two (or n) streams

Question

• 2 streams:

  Given readable streams stream1 and stream2, what\'s an idiomatic (concise) way to get a stream containing

Answer 1

this can be done with vanilla nodejs

import { PassThrough } from 'stream'
const merge = (...streams) => {
    let pass = new PassThrough()
    let waiting = streams.length
    for (let stream of streams) {
        pass = stream.pipe(pass, {end: false})
        stream.once('end', () => --waiting === 0 && pass.emit('end'))
    }
    return pass
}