Convert WinJS APIs into CommonJS modules

usage.js

define('my-app', function (require) {
    var app = require('WinJS/Application');

    app.onactivated = function (args) {
        //activation stuff
    };

    app.start();
});

WinJS-to-CommonJS.js

(function (global) {
    var walker = function (k, t, o) {
        if(!t) {
            t = k;
        } else {
            t = t + k + '/';
        }
        if(typeof o !== 'object') {
            if(t) {
                require.define(t.substring(0, t.length - 1), function (r, m, e) {
                    m.exports = o;
                });
            }
            return;
        }
        var keys = Object.keys(o).filter(function (x) {
            return /[A-Z]/.test(x.charAt(0));
        });
        for(var i = 0; i < keys.length; i += 1) {
            walker(keys[i], t, o[keys[i]]);
        }
        require.define(t.substring(0, t.length - 1), function (r, m, e) {
            m.exports = o;
        });
    };
    walker('', 'WinJS', global.WinJS);
    walker('', 'Windows', global.Windows);
})(this);