Some alternatives to core async that I think are very thoughtful are promesa[0] and manifold[1]. We've got a large chunk of core async code that if I had to redo I would use one of those libraries. They are conceptually simpler, I think, and they don't have the same downsides as the `go` macro.

That said, our code works and I'm not about to rewrite it just because some new libraries came out.

As for spec and transducers, I do use spec quite heavily, though now that clojure.spec.alpha2 is on the horizon I'm holding off a bit - it will be really nice to have data-based specs instead of macro based ones.

For transducers I've only used them when I've found a performance bottleneck in a data transformation pipeline, which for me means only on toy algorithm problems and not in production code. But that says more about my line of work than their usefulness, I think. I didn't find them too hard to grasp.

There's some cool work being done with hooks that are mentioned up thread, and I think there a fork of reagent that is experimenting with them. This is actually a really exciting time in cljs-land, there are a lot of interesting projects exploring what we can do to build on ideas from React (hooks) and Svelte. The Svelte approach is especially interesting to me, since it's basically just a compiler, which we can do with a macro. And with shadow-cljs the build tools are better than they've ever been.

[0]https://funcool.github.io/promesa/latest/ [1]https://github.com/ztellman/manifold