Uncaught TypeError: undefined is not a function when using require.js

Question

I'm new to require.js so I may not be using it correctly, but as far as I know, I can't find what's causing the error.

Structure

index.html
Scripts\
  - jquery-2.1.1.min.js
  - require.js
  \app
    - main.js
  \lib
    - work-requests.js
    - controller-base.js
    - util.js

index.html

<script src="Scripts/require.js" data-main="Scripts/app/main"></script>

main.js

requirejs.config({
    baseUrl: 'Scripts/lib',
    paths: {
        jquery: '../jquery-2.1.1.min',
    },
});
requirejs(['jquery', 'util', 'work-requests'], function ($, util, work_requests) {
    $(function () {
    var foo = new work_requests.get_all(); // <-- error "Uncaught TypeError: undefined is not a function
});

work-requests.js

define(['controller-base'], function (controller_base) {
    return function () {
        var that = controller_base('work-requests')

        return that;
    }
});

controller-base.js

define(['jquery'], function ($) {
    return function (controller_name) {
        var that = {};
        that.controller = controller_name;

        that.get_all = function () {
            return $.ajax({
                type: 'get',
                contentType: 'application/json',
                url: _api_root + '/' + that.controller,
            });
        };
        return that;
    };
});

util.js

define({
  foo: function(data){},
});

Answer 1

Your require.js setup is completely fine. Did you try changing

var foo = new work_requests.get_all();

to

var foo = new work_requests();
var bar = foo.get_all();

?

Answer 2

Duplicate.

You're looking for mainConfigFile: 'path/to/main.js' requireJS optimization: undefined is not a function