As noted by @madeofpalk [0], Hotwire is the successor of Turbolinks, which dates back to at least 2012 [1].
That said, I'm not particularly interested in litigating who inspired who. Both libraries are neat and have developed in parallel for ten years. That's cool!
For what it's worth, I mentioned HTMX to a Ruby developer friend, and his reaction was "oh, like Turbolinks", so I think the mindshare was probably there first. That having been said, HTMX is my preferred way of making dynamic frontends now. I've never been a React developer, but I've always found SPAs way, way overused.
Yeah, Turbolinks was huge throughout the Rails era—I remember it even being part of the random beginner tutorials that I did back in the day. I only ever heard of intercooler.js after htmx was announced.
