New Post: Constructing a reusable framework

Of course the answer is "it depends". ;+)

Is your library going to be the middleware between AngularJS and SharePoint? If so, check out the excellent work Andrew Connell has done with AngularJS and Breeze:
http://www.andrewconnell.com/blog/breezejs-makes-client-side-sharepoint-2013-rest-development-a-breeze

Can you tell me more about what you are trying to accomplish?

M.