Maintained some old Dockerfile. Confused how `npm install` could possibly work as the working dir of that command was a *subfolder* with *no* `package.json`. Yet it verifyably installed into the correct package on build to the parent folder with the `package.json`. I assumed a grunt or npm script taking care of it, yet found nothing. Digging deeper, I realized: [this is by design](https://github.com/npm/npm/...).