Reminds me a bit of Objective-J. What ever happened to that (it had a pretty nifty extjs-ish/Cocoa-like framework whose name my brain can't access right now)?
Way ahead of its time when the idea of writing full-fledged desktop apps in the browser still seemed ludicrous.
In a complete shock to me, the project is active and recently hit 1.0!
http://www.cappuccino-project.org/blog/2018/04/cappuccino-1-...
So that's also one of the directions for Objective-Smalltalk: use Cappuccino on the web.
Right now we're seeming to approach that again, only not exactly in a better way (you don't have to type HTML/CSS, but still know it all!).
I'm quite surprised too. My guess is that a large company, most likely Apple, have a bunch of internal applications built on it so keep the project active enough with contributions or donations.
Not too coincidentally, the author of Objective-Smalltalk, who said above that he wants to leverage Cappuccino, has also written up his criticism of React here: https://blog.metaobject.com/2018/12/uis-are-not-pure-functio...
Related: I've talked to a Cappuccino founder recently too, and my casual observation (which he agreed with) was that had they done Cappuccino all over again, they should have probably dropped Objective-J. Imo it's just a bit too much of a language bikeshedding and I don't think it would have changed framework _that_ much (proof: Swift works well with UIKit and AppKit). Though my opinion was just based on practicality of adoption; if Objective-smalltalk wants to take its time exploring around more than anything else, then I'd say it + cappuccino seems like a nice fit.
I'm really looking forward to Cappuccino staying alive for another ten years (and I wish all the luck to Objective-smalltalk's author) =). Though the recent Cappuccino conf doesn't feature many younger programmers.