due to the way this uses rc, this pkg will find a url specified in a user's .npmrc file, but not necessarily the global npmrc.

the global npmrc according to npm is located at $PREFIX/etc/npmrc where $PREFIX is determined based on where node is installed. for example, the node:dubnium-alpine docker container comes with a node install where the global config is expected to be at /usr/local/etc/npmrc. if you're using nvm, your npm will look for a file somewhere similar to /Users/colby.white/.nvm/versions/node/v10.24.0/etc/npmrc.

looking at how rc defines its logic, it will never look at /usr/local/etc/npmrc, looking at /etc/npmrc instead.

and thus if the registry url is defined in a global npmrc, this pkg will never find it.