Using spawn function with NODE_ENV=production

Question

I\'m currently trying to run process using spawn. What I am trying to run from shell is the following;

NODE_ENV=production node app/app.js

Answer 1

Syntax: spawn(command, [args], [options])

var spawn = require('child_process').spawn;
var start = spawn('node', ['app.js'], {env: {NODE_ENV: 'production'}});

Or keep default ENV variables:

var spawn = require('child_process').spawn;

var productionEnv = process.env; // TODO should clone process.env like utils.extend
productionEnv.NODE_ENV = 'production';

var start = spawn('node', ['app.js'], {env: productionEnv});

---

My test:

app.js

console.log(process.env);

spawn.js

var spawn = require('child_process').spawn;
var start = spawn('node', ['app.js'], {env: {NODE_ENV: 'production'}});

start.stdout.pipe(process.stdout);

from terminal:

node spawn

output:

{ NODE_ENV: 'production' }