BackboneJS support.

[niksite]

In BackboneJS we declare models/views like the following:

var AppView = Backbone.View.extend({
or
var TagModel = Backbone.Model.extend({
or
var TagsCollection = Backbone.Collection.extend({.

None of that could be found by goto-definition right now.

Probably, we should have something like /(^|\s)var\s+{word}(\s|$)/ in JavaScript.regexes or something backbone specific if by some reason we should not detect all var here.