@U061V0GG2 Maybe shed some light on this for me, thanks.

useEffect uses the return value if its a function. maybe this is just to ensure no unwanted effects happen. just a guess though

I thought useEffect can return a function to do some cleanup, so this may prevent the cleanup to take effect.

React requires the return value is always either a function or undefined: https://github.com/reactwg/react-18/discussions/95

Thanks. I finally understand it now.

https://www.metosin.fi/blog/reagent-towards-react-18/#the-new-api

If you search for it online or here, you'll get about a bazillion results with tips. ;) Just add ^js in front of x.

Ah sorry, just found answers saying it should be fixed with the newest version.

see https://shadow-cljs.github.io/docs/UsersGuide.html#externs

Any idea, why this doesnt work?

10 |   (async/go (swap! current-post assoc
---------^----------------------------------------------------------------------
 Cannot infer target type in expression (. inst_12835 -author)
--------------------------------------------------------------------------------
  11 |                    :author-name (get (async-interop/<p! (pb/get-record "users"
  12 |                                                                        (.-author ^js @current-post)
  13 |                                                                        [])) :name)))

I mean it should be right?

unfortunately the go macro loses type hints

Uhm, and how do I have to do it then?

I mean it doesnt works with

(def current-post ^js (r/atom nil))

write an accessor function and use that

(defn get-author [^js x] (.-author x)) or so

or don't use go, which is what I would recommend

see https://clojureverse.org/t/promise-handling-in-cljs-using-js-await/8998

Thanks! And is there a way to run the async-stuff sync?

no, that is impossible in JS

So, currently I have

(defn open-post [post-id]
  (shadow-modern/js-await [post (pb/get-record "posts" post-id)]
                          (println (str "post: " post))
                          (shadow-modern/js-await [author-name (->> ^js post
                                                                    .-author_name
                                                                    (pb/get-record "names"))]
                                                  (println (str "author-name: " author-name))
                                                  (reset! post-view/author-name author-name))
                          (reset! post-view/current-post post)))

(post-view is rendered by current-post btw)

How would you do smth like this?

sorry I do not have enough information about what you are doing to answer

I'd say you have to wait to render anything until you get the name

or display a placeholder

Ah, thats a good idea, thanks!