I've been working on 'Fragno', a TypeScript framework to build full-stack libraries with. It allows the library author to define backend routes, and provides them with reactive primitives for building frontend logic using these routes. This all embeds into the user's application. Eventually, it should include a data layer as well.

The ideas are in large part inspired by Better-Auth, which is built on top of similar primitives. I hope more libraries will be built in this manner, because I believe that it provides very nice DX for the integrator/end-user.

It's not quite ready yet, but I did write most of the documentation.

https://fragno.dev