One way of cross-module node.js inheritance

base.js

module.exports = function() {
  console.log("In base constructor.");
}

module.exports.prototype.myfunc = function() {
  console.log("This is the base.");
}

inherit.js

var base = require ('./base');
var util = require('util');

function SubClass() {
  console.log("In sub constructor.");
  SubClass.super_.apply(this, arguments);
}

util.inherits(SubClass, base);

SubClass.prototype.myfunc = function() {
  console.log("This is the sub.");
  SubClass.super_.prototype.myfunc.apply(this, arguments);
}

var obj = new SubClass();

obj.myfunc();