duplex.js

"use strict";

/*
const duplexer2 = require('duplexer2')
const {Readable, Writable} = require('stream')
*/

const duplexer = require('duplexer2')
const child_process = require('child_process')

let cp = child_process.spawn('bash')
let dp = duplexer(cp.stdin, cp.stdout)

dp.on('error', function(err) {
    console.log('had error', err)
})

dp.on('data', function(data) {
    console.log('data:', data.toString())
})

dp.write('ls -l\n')