What is the best way to handle shared constants between server code and client code using Backbone.JS ? For example, say I have this map of user roles:

user_roles = {
  1 => "member", 
  2 => "moderator", 
  3 => "admin"}

Obviously, if you duplicate these definitions in code at both client and server side, this doesn't scale well and is error-prone.

The solution I could come up with is simply expose these definitions as a Backbone.Collection or Backbone.Model and fetch them from the server, but this might cause undesired overhead if you have a large amount of constant types, and I'm not sure whether they actually belong inside the model at all.

What are the different solutions to solve this problem, and how well do they scale?

javascript backbone.js
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