Datalog in miniKanren https://deosjr.github.io/dynamicland/datalog.html
And it's using @spritely's Hoot to compile to Webassembly! It's so cool when things like this appear in the wild and you don't even know someone was working on it!
And, this subthread on HN is actually a pretty interesting exchange https://news.ycombinator.com/item?id=44285812