Bash script to update project dependencies quickly

install.js

#!/usr/bin/env node

/*
Usage:

Install all production depenencies to their current version: ~/npm/install --prod
Install all production depenencies to their latest: ~/npm/install --prod --latest
Install all production depenencies to their latest and update package.json: ~/npm/install --prod --latest --save

Install all development depenencies to their current version: ~/npm/install --dev
Install all development depenencies to their latest: ~/npm/install --dev --latest
Install all development depenencies to their latest and update package.json: ~/npm/install --dev --latest --save
*/

const argv = require('minimist')(process.argv.slice(2))

const latest = argv.latest
const iDev = argv.dev
const iProd = argv.prod

const execSync = require('child_process').execSync
const path = require('path')

function exec(cmd) {

  execSync(cmd, {stdio: [0,1,2]})

}

const pkg = require(path.join(process.cwd(), 'package.json'))

// Install production dependencies
if(iProd) {

  const dependencies = []

  const keys = Object.keys(pkg.dependencies)
  for(let i = 0, l = keys.length; i <l; i++) {
    const key = keys[i]
    const val = (latest) ? 'latest' : pkg.dependencies[key]

    dependencies.push(`${key}@${val}`)
  }

  const dependenciesString = dependencies.join(' ')
  const save = (argv.save) ? '--save' : ''

  exec(`npm install ${dependenciesString} ${save}`)

}

// Install development dependencies
if(iDev) {

  const devDependencies = []

  const keys = Object.keys(pkg.devDependencies)
  for(let i = 0, l = keys.length; i <l; i++) {
    const key = keys[i]
    const val = (latest) ? 'latest' : pkg.dependencies[key]

    devDependencies.push(`${key}@${val}`)
  }

  const devDependenciesString = devDependencies.join(' ')
  const devSave = (argv.save) ? '--save-dev' : ''

  exec(`npm install ${devDependenciesString} ${devSave}`)

}

It has a mistake, search 'depenencies' in file, I can not modify it to help.