gistfile1.js

var mdeps = require('module-deps')
  , builtins = require('builtins')
  , lodash = require('lodash')
  , used = []
  ;

function filter (id) {
  if (builtins.indexOf(id) === -1) return true
  used.push(id)
  return false
}

var md = mdeps({filter:filter})

md.on('data', function (obj) {
  console.log(obj.file)
})

var request = require(__dirname+'/tmp/node_modules/request/package.json').main || 'index.js'
request = __dirname+'/tmp/node_modules/request/'+request

md.end({ file: request });

md.on('end', function () {
  console.log('used', lodash.unique(used))
})