README.md

Just a tiny gist to illustrate node shares required dependencies between different files that require the same module. Modifying underscore in the parent file modified it for the child files as well.

module1.js

var _ = require( "underscore" );

module.exports = {
	_: _,
	run: function () {
		console.log( _.amazing );
		console.log( _.after );
	}
}

module2.js

var _ = require( "underscore" );

module.exports = {
	_: _,
	run: function () {
		console.log( _.amazing );
		console.log( _.after );
	}
}

package.json

{
  "name": "http-server",
  "version": "0.0.1",
  "author": "Doug Neiner <doug@dougneiner.com>",
  "main": "./parent.js",
  "dependencies" : {
    "underscore"   :  "*"
  },
  "license": "MIT",
  "engines": {
    "node": ">=0.10"
  }
}

parent.js

var _ = require( "underscore" );

_.amazing = "Awesome";

var m1 = require( "./module1.js" );
var m2 = require( "./module2.js" );

_.after = "This too";

// Expects: "Awesome"
// Expects: "This too"
m1.run();

// Expects: "Awesome"
// Expects: "This too"
m2.run();

// Expects: true
console.log( m1._ === _ );