var App = (function(app) {
var Sound = app.Modules.Sound,
Input = app.Modules.IO.Input,
...
...
})(App || {});
This solution has several advantages:
Indicated at the top of the module, it is clearly visible at a glance (supported code),
The usual benefits of importing are less typing, avoiding namespace conflicts, etc. (supported code)
Long ways to search for properties ( a.b.c.d) will be needed only once (performance),
, - (),
, .