I recently updated Node RED to version 2.2.0 and my nightly rsync backup complains about dangling symlinks:
symlink has no referent: "/home/pi/.node-red/node_modules/.bin/prebuild-install"
symlink has no referent: "/home/pi/.node-red/node_modules/.bin/semver"
Everything seems to be working normally, I just thought I'd bring this to somebody's attention.
Edit: Originally this was created under 'General' but I now moved it to 'Core Development' since it may be more relevant there.