gistfile1.rb

name 'some-role'
description 'some role that needs some users'

default_attributes :active_groups => { :somegroup => { :enabled => true },
                                       :someothergroup => { :enabled => true } }

gistfile2.js

{ 
  "name": "some-role",
  "description": "some role that needs some users",
  "default_attributes": {
    "somegroup": { "enabled": true },
    "someothergroup": { "enabled": true }
  }
}