Stack MEAN UML diagram, Angular UML diagram and pattern design

I need to do a Stack MEAN UML diagram, the problem is that JavaScript is a prototype based language, and it doesn't have classes.

How can I represent the relations between JavaScript objects in UML?

In the other hand, Angular has a lot of features that implement design patterns for themselves like dependency injection, routes, factories, $scope, $inject...

How can I represent this pattern design in an UML diagram?