module of module

moduleofmodule.js

var foo = require('./foo')
  , barOfFoo = moduleOfModule('./bar', './foo')

function moduleOfModule(module, ofModule) {
  var c = require.cache[require.resolve(ofModule)]
    , f = require.resolve(module, c)
    , r
  c.children.some(function(c) {
    if(c.filename === f) {
      r = c.exports
      return true
    }
  })
  return r
}

WARNING This is Black Magic. It will break your application tomorrow.