It would likely be a good idea to divest yourself from this package given the actions of the maintainer. As others have said, this appears to be intentional. There has been a 6.6.6 release to npm published ~8 hours ago as of this post, which has nothing in it.
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No more free work from Marak - Pay Me or Fork This
https://web.archive.org/web/20201226190222/https://github.co...
Discussion from the time:
https://news.ycombinator.com/item?id=25032105
Also a discussion about his blog on the subject (which appears to be down):
https://news.ycombinator.com/item?id=27252066