I'm working on something similar. I hope to pick up some ideas ;)
My project is about helping create more traditional JavaScript applications, not necessarily JAMstack. It is inspired by the Self programming environment created at Sun Microsystems in '95, so it's not a framework per-se, but a combination of a framework, an editor (VS Code plugin) and (in the future) infrastructure.
The project is called Huncwot: https://github.com/huncwotjs/huncwot
* it supports TypeScript out of the box * it provides background processing (via Postgraphile Worker) * it aims to support only PostgreSQL, so that we could conveniently use all those beautiful PostgreSQL features that are usually «hidden» by ORMs * I'd also like to make SQL more popular ;) * there is a bit of inspiration from Clojure * it favors the function composition, e.g. for handlers * it comes with a built-in authentication/authorization, which you shouldn't probably use in production just yet * it is still very alpha * for the front-end you can use React, but also Vue.js and possibly Angular or Svelte * and many other things which I haven't yet described in the README as I work on this on the side, mostly alone
There is also fantastic Dark Lang (https://darklang.com/) in the same, quite similar yet different.