Correct. That was written for the v2 network and as BrightSilence points out, we’re currently running on the v3 network.
Providing a pure JS version of libuplink would also require a pure JS version of DRPC, our RPC framework (I started this last year, but haven’t had a chance to get back to it GitHub - mjpitz/drpc-node: (WIP) NodeJS implementation of drpc).