This is an unsupported version of the original vinyl-fs version 0.3.x (which is pretty old), migrated to graceful-fs 4.x in order to make it work with Node.js 6.x and above, with the only intention — to use this as a transition package.
If you are looking for vinyl-fs, you should probably just use recent versions of the original vinyl-fs, they are fixed.
This package is not going to be supported and was deprecated the moment it was created.
DO NOT USE IT.