Common JS objects

main.js

// if other is not required for it's side effect, singleton will not have a color property.
var other = require('./other');
var singleton = require('./singleton');

console.log(JSON.stringify(singleton)); // => {"color":"red"}

other.js

var singleton = require('./singleton');

singleton.color = 'red';

singleton.js

var singleton = {};

module.exports = singleton;