build.sh

#!/usr/bin/env node

var path = require('path')
var parse = require('minimist')
var browserify = require('browserify')
var args = parse(process.argv.slice(2))
var entries = args._
var output = args.o || args.output
var main = args.m || args.main
var url = args.url || output
var options = {
    main: main,
    map: {},
    output: output,
    url: url
}
var temp
var pkgPath
var pkg
entries.forEach(f=> {
  // We need to treat the entry file differently. You can't expose an alias for it.
  if (f === main) {
    console.info('require:', f)
    console.info('output:', output+'/'+'entry.js')
    console.info('script src:', url+'/'+'entry.js\n')
    // Going to hard code entry.js because works.
    options.map['entry.js'] = [f]
  } else if (f.split('/').pop() === 'index.js') {
    pkgPath = f.split('/')
    pkgPath.pop()
    pkgPath = pkgPath.join('/')
    pkg = require(path.join('../', pkgPath, 'package.json'))
    temp = pkg.name
    console.info('require:', f)
    console.info('output:', output+'/'+temp+'.js')
    console.info('expose:', temp)
    console.info('script src:', url+'/'+temp+'\n')
    if (temp) {
      options.map[temp+'.js'] = [{
        require: f,
        expose: temp
      }]
    }
  } else {
    temp = f.split('/').pop()
    console.info('require:', f)
    console.info('output:', output+'/'+temp)
    console.info('expose:', temp.replace('.js', ''))
    console.info('script src:', url+'/'+temp+'\n')
    options.map[temp] = [{
      require: f,
      expose: temp.replace('.js', '')
    }]
  }
})

console.info('partitioning bundle with options:\n', options)

var b = browserify()
b.plugin('partition-bundle', options)
b.bundle()

In your package.json you can use them in the "scripts" section like so:

"local": "./scripts/build ./index.js ./screens/*.js -o=assets -m=./index.js"
"prod": "./scripts/build ./index.js ./screens/*.js -o=assets -m=./index.js --url='http://remote.url.like.s3'"

Added the ability to pass a folder of directories with package.json files included

Screens
|--Home
     |--index.js
     |--package.json
         |-- {  main: index.js, name: 'home' }