Adding Backbone.js extensions to a Require.js project.

extensions.js

define(['backbone'], function (Backbone) {
    return {
        init: function () {
            Backbone.View.prototype.close = function () {
                this.remove();
                this.unbind();
        
                if (typeof this.onClose === 'function') {
                    this.onClose();
                }
            };
        }
    }
});

main.js

(function () {
    require.config({
        paths: {
            backbone: 'path/to/backbone.min.js',
            underscore: 'path/to/underscore.min.js',
            jquery: 'path/to/jquery.min.js',
            extensions: 'path/to/extensions.js'
        },
        shim: {
            underscore: {
                deps: [],
                exports: '_'
            },
            jquery: {
                deps: [],
                exports: '$'
            },
            backbone: {
                deps: [ 'underscore', 'jquery' ],
                exports: 'Backbone'
            }
        },
        callback: function () {
            require([ 'underscore', 'backbone', 'jquery', 'extensions' ], function (_, Backbone, $, ext) {
                // Call `init` to add the `close` method to Backbone.View
                ext.init();
                
                // Do all the other stuff you need to do here. Fetch data, set up router,
                // start Backbone history, etc.
            });
        }
    });
}());