I checked if there could be some conflict due to previous installed library: I created a new VM with a dedicated environment for DoneJS, with npm 2.15.9 and node v4.6.1.
The problem still remains: it seems that the global variable $traceurRuntime is not seen due to the change of environment (NODE_ENV=production).
Since I don't see traceur/traceur-runtime package inside the node_modules dir I tried to force it adding the dependency in packet.json (dependencies object) and I installed them directly but without results
Maybe I forgot something?
I got the same problem with the second (in-dept) tutorial.
Maybe something regarding stealJS configuration?