backbone.js - Where is Backbone.Model.extend method defined? -

backbone.js - Where is Backbone.Model.extend method defined? -

i'm reading backbone.js code , can't find definition of backbone.model.extend method.

where it?

at end of source, under helpers, there's helper function correctly set prototype chain, subclasses :

var extend = function(protoprops, staticprops) { }

which assigned backbone prototypes

model.extend = collection.extend = router.extend = view.extend = extend;

backbone.js