testing an object which is shared between all instances of the current module and made accessible through require()

a.js

var b = require('./b');
var b2 = require('./b');

console.log(b.test());
console.log(b2.test());
console.log("-----");
b.omg();
console.log(b.test());
console.log(b2.test());

b.js

var hello = "hello";

module.exports = {
    test: function () {
        return hello;
    },

    omg: function () {
        hello = "hello_modified";
    }
}