i think of it more as systemd than apt. calling it a package manager isn't all that accurate.
Scroll down to the "Module Loaders" section at http://todomvc.com/ I don't see any of the products listed you mentioned.
Notice that require.js works with Backbone.js, Ember.js, Knockout, AngularJS, Ember.js, Knockout, AngularJS, CanJS.
TroopJS uses require.js. The only major competition it has is Thorax + Lumbar or Twitter's Flight.
Really, it's only a matter of time before someone creates a JavaScript package manager manager so you can manage your package managers.