How to get output from node exec when running `npm install`? - node.js

Question

I'm running the following:
const exec = require('child_process').exec;
let installProcess = exec('npm install');
installProcess.stdout.pipe(process.stdout);
installProcess.stderr.pipe(process.stderr);
But I get no output in my terminal, what else can I try?

Answer 1

The following ended up working for me:
const execSync = require('child_process').execSync;
execSync('npm install', {stdio:[0,1,2]});

Answer 2

This works perfectly
const exec = require('child_process').exec;
const installProcess = exec('npm install --verbose');
installProcess.stdout.on('data', process.stdout.write);
installProcess.stderr.on('data', process.stdout.write);
installProcess.on('close', (code) => process.stdout.write(`exited with ${code}`));
and the result
❯ node index.js
stderr: npm
stderr: info it worked if it ends with ok
npm verb cli [ '/usr/local/Cellar/node/6.3.0/bin/node',
npm verb cli '/usr/local/bin/npm',
npm verb cli 'install',
npm verb cli '--verbose' ]
npm info using npm#3.10.3
npm info using node#v6.3.0
stderr: npm verb
stderr: correctMkdir /Users/bwin/.npm/_locks correctMkdir not in flight; initializing
stderr: npm
stderr: info lifecycle tmp#1.0.0~preinstall: tmp#1.0.0
stderr: npm verb
stderr: exit [ 0, true ]
stderr: npm info
stderr: ok
exited with 0