anybody that can tell me what the correct interop would be for something like this $('.ui.sidebar').sidebar('show');

(-> (js/$ ".ui.sidebar")
    (.sidebar "show"))

many thanks

@restenb you have jQuery added to externs (or from cljsjs) already?

What’s the best way for writing a predicate to check if something implements the ILookup protocol?

cljs.user=> (satisfies? ILookup {:a 1})
true
cljs.user=> (implements? ILookup {:a 1})
true

probably satisfies?

Yeah, @borkdude implements? is really an internal thing

so I’m trying to write an app that interacts with some other bits outside of it’s code base. This seems to work when I’m testing it in a development build, but when I try and do a release build and put it on a page, it breaks:

(defn ^:export start! [node]
  (a/go-loop []
    (let [ev (a/<! (gobj/get js/window "PUNK_IN_STREAM"))]
      (println ev)
      (dispatch ev)
      (recur))))

lost the error, reproducing so I can paste it… it gives a fairly indecipherable error out the take on the channel

punk.js:10623 Uncaught TypeError: Cannot read property 'pop' of undefined
    at punk.js:10623
    at $JSCompiler_StaticMethods_cljs$core$async$impl$protocols$ReadPort$take_BANG_$arity$2$$ (punk.js:10632)

on the page I have another app that has this in it:

(gobj/set js/window "PUNK_IN_STREAM" (a/chan))

looks like a race condition to me

in your code

the fact that it works in dev is just getting lucky

hmm. I can’t imagine it yet.

the error is telling you there is no channel

I changed it to take the in-stream chan as an argument

(defn ^:export start! [node in-stream]
  (a/go-loop []
    (let [ev (a/<! in-stream)]
      (println ev)
      (dispatch ev)
      (recur))))

I would change the code to check in-stream before reading

(defonce in-stream (a/chan))

(def start-punk! (gobj/getValueByKeys js/window "punk" "ui" "core" "start_BANG_"))

(start-punk! container in-stream)

it does seem strange to me that you have to communicate via window var

instead of sharing a proper reference

yeah, I had other ideas but I changed it to passing a reference. same error

and you put a println in there to confirm you have a thing to debug this?

well, first I put a pre assert. I just added a println…

(defn ^:export start! [node in-stream]
  {:pre [(not (nil? in-stream))]}
  (println in-stream)
  (a/go-loop []
    (let [ev (a/<! in-stream)]
      (println ev)
      (dispatch ev)
      (recur))))

the println prints:

#object[Object [object Object]]

but this is in release, so maybe it’s not pretty-printing correct because of that?

could there be conflicts because I have two CLJS apps on the same page, one passing a channel to another?

in my second app, which is trying to use this release-built one, I have this:

(defonce in-stream (a/chan))

(println in-stream)

(def start-punk! (gobj/getValueByKeys js/window "punk" "ui" "core" "start_BANG_"))

(start-punk! container in-stream)

#object[cljs.core.async.impl.channels.ManyToManyChannel]       core.cljs:192
#object[Object [object Object]]                                punk.js:756

@lilactown you can't have two apps on the same page

nothing will work

there can only be one build in the same JS context, period

so I have one app that has been built and released. I’m trying to use it on a page with another app, which I am developing

that’s a no-go?

no-go

that isn't completely true

but you have to really really know what you're doing

but ClojureScript isn't going to help you

I only have a single module

my built and released application otherwise appears to work, except that it can’t seem to accept this channel created by the second app

it’s kind of important that this first application be built separately from the second, since it’s meant to be a 3rd party application that in the future will utilize self-hosted CLJS. I don’t want to impart the burden of configuring that on the consumer

interestingly, passing in a map from the second (dev time) app to the first (released) app results in different printing behavior:

#object[Object {:foo "bar"}] ;; foreign map
{:baz asdf}                  ;; map created in the same build

and trying to do (:foo foreign-map) results in nil

I wonder if the way CLJS protocols operate is somehow scoped to the build they are produced in. so a CLJS data type created in one build does not seem to interop in another build

if so that pretty much destroys my application 😕

@dnolen what do you think?

Has anyone managed to successfully mix Rust/Wasm32 + CLJS for web development? I'm looking for a model where the high performance / "foundational" code is written in statically typed Rust, with some API layer of structs / traits exposed -- then being able to interactively develop CLJS on top of this (via figwheel or the like).

haven’t done it, but I see a few libraries that might be interesting

https://github.com/pkpkpk/fress looks nice