I had someone make me 2 versions of node. v8 and v9. I am using v8 successfully for a while now. I also had upgraded the npm.
https://www.dropbox.com/s/skm0d51ou4yqnqt/node_v8.11.3-2_mipsel_24kc.ipk?dl=0
https://www.dropbox.com/s/nuyvqo3rtkxhab2/node-npm_v8.11.3-2_mipsel_24kc.ipk?dl=0
Let me know how you like it, install it using opkg.