I'm not sure if this is a bug or intentional, but I've noticed that adding double quotes around any globally installed node modules (e.g. "npm") causes node to try and access it from your working directory. This actually causes this module to break since all the arguments are quoted. I tested this with the latest LTS release of node, which as of now is v8.10.0. It would be nice if there was either an alternate way to run these modules with this exec proxy or make a quick patch to allow this functionality with a small sacrifice to security.