Client.js

var Egg = require('egg.js');

Egg.publicMethod();

var Person = require('ConstructorExample.js');

var greg = new Person('Greg');

ConstructorExample.js

function Person(name) {
  this.name = name;
}

Person.prototype = {
  getNameQuestion: function() {
    return this.name;+ '?';
  }
};

module.exports = Person;

Egg.js

var privateValue;

function privateMethod() {

}

module.exports = {
  publicMethod: function() {
    return privateMethod();
  }
}