Is there an accessible callback when Craft.EntryTypeSwitcher is run?
It looks like the only easy way to hook into that event is to listen for the resize event on the window object. On line 55, it is triggering resize(). Looking at the code, I am not seeing any other way to listen for these events. The Craft.EntryTypeSwitcher class is getting instantiated but not getting assigned to any variable in the DOM, so there is no way for you to grab that instance (from what I can tell anyway).