Trouble with a Malformed Function definition and Using it via Inheritance

I'm using Cucumber.js and the PhantomJS-Node wrapper.

I'm not a guru at JavaScript yet or OOP or Closures and all that quite yet.

I've created a World.js for Cucumber so I can create some Phantom objects for example the page object that I wanna use in my Cucumber tests.

and in it I currently have:

var phantom = require('phantom');

var World = function World(callback) {

    phantom.create("--web-security=no", "--ignore-ssl-errors=yes", { port: 12345 }, function (ph) {
        var phantomProcess = ph;

        this.createBrowserPage = function(){
            phantomProcess.createPage(function(page) {

                this.headlessPage = page;
            });
        };
    });

    callback();
};

exports.World = World;

I then have my Cucumber.js step_definitions.js which has:

this.World = require("../../support/world.js").World;

module.exports = function() {
    "use strict";

    this.createBrowserPage();

    var page = this.headlessPage;

    this.Given(/^I visit the customers display page$/, function (callback) {

        page.open("/", function(status){

            status.should.equal("success");
            callback();
        });
    });

// ...etc.
};

(and then later I plan on adding a hook to stop the phantom session via phantomProcess.exit(). For now I just wanna get this issue resolved with the function I'm trying to call from my tests)

The problem I have is I get undefined is not a function for the line this.createBrowserPage() in my module.exports = function().

So I am probably not defining and exposing / inheriting that function correctly in my World.js and would like some help in how I can properly code that function and use it in my step definition.

Functions are first class citizens in JS right? So I assume what I've done is exposed World (exports.World = World) and I thought I was properly defining the createBrowserPage() as a property of the object World so I could use it elsewhere but apparently I'm not doing this right or this is not possible the way I'm trying to code all this.