Script to run npm install for all nested folders

npm-install-all.js

/**
 * Script to run npm install for all nested folders
 * 
 * Reference: https://stackoverflow.com/questions/31773546/the-best-way-to-run-npm-install-for-nested-folders
 */
var fs = require('fs')
var resolve = require('path').resolve
var join = require('path').join
var cp = require('child_process')
var os = require('os')

// get library path
var lib = resolve(__dirname, './')

fs.readdirSync(lib)
  .forEach(function (mod) {
    var modPath = join(lib, mod)
    // ensure path has package.json
    if (!fs.existsSync(join(modPath, 'package.json'))) return

    // npm binary based on OS
    var npmCmd = os.platform().startsWith('win') ? 'npm.cmd' : 'npm'

    // install folder
    cp.spawn(npmCmd, ['i'], { env: process.env, cwd: modPath, stdio: 'inherit' })
})