what should i put in an extern file for objects returned by another method in the extern file?

like, a factory method

Is there a pattern for non-protocol-defined methods on deftypes ? For cases where only one kind of deftype has the method..

every method on a deftype must come from a protocol or interface

OK that’s fine with me

@minikomi in CLJS you can actually just do (deftype Thing [x] Object (foo [this] ...)) (.foo (Thing. :x))

ie, define functions on Object

oh, I had no idea

ahh yeah i thought I saw something along those lines thanks!

CLJS only, CLJ can’t do that

right

experimenting with doing some 2d stuff in the browser using cljs.. currently abusing deftype as an alternative to dropping down to js objects to avoid GC with a lot of updates each frame

a meetup on this Thursday in Singapore https://www.meetup.com/Singapore-Clojure-Meetup/events/240601551/

Hey, so if I successfully compile my cljs app with target being nodejs meaning it can then be used as a node lib what’s the way to go about making it a node lib that can be installed with yarn/npm

Meaning it would need a package.json

How do people go about this?

Basically I want my cljs lib to be used in a node app.

nvm lol

@urbanslug docs are still sketchy but it isn’t hard to do https://github.com/thheller/shadow-cljs/wiki/ClojureScript-for-node.js-libraries

@thheller Yeah, I saw your lib and tried it out.

Plus you told me about it the last time.

I think I’ll try it

in fact if you yarn add --dev shadow-cljs .. it has been built with it 😉

Problem was that I didn’t have a package.json

yeah you need that if you want to publish to npm

https://github.com/thheller/shadow-cljs/tree/master/packages/shadow-cljs

the CLJS code gets compiled into the cli folder there

Was playing with clojurescript datastructures for use as queues (fifo or lifo), so I made this table to visualize the differences: https://gist.github.com/pesterhazy/4dac98a570b9534e56cace78b945bc62

Does anyone have experience with async tests in cljs.test? I am struggling to get this simple test working:

(deftest async-test
  (async done
         (let [result (atom nil)
               foo (chan)]
           (go
             (>! foo 123)
             (reset! result (<! foo)))
           (time/sleep 1000)
           (is (= 123 @result)))
         (done)))

Following instructions here https://github.com/clojure/clojurescript/wiki/Testing#async-testing

@acron that’s not going to work

you’re calling done before the test is done

@dnolen time/sleep is

(defn sleep [msec]
  (let [deadline (+ msec (.getTime (js/Date.)))]
    (while (> deadline (.getTime (js/Date.))))))

nope

fix your test

put done in the right place

move the tests into the right place

i.e. inside the go block

@dnolen thanks! it appears the code hangs on putting the value in the foo channel

@acron as expected

there are no takers

Sure, I'll shuffle this round a bit

you probably want two go blocks

one to write, one to read

and get rid of time/sleep

that’s just a bug - you cannot sleep in single threaded environment

okay

perfect, thanks @dnolen

(deftest async-test
  (let [result (atom nil)
        foo (chan)]
    (async done
           (go
             (>! foo 123))
           (go
             (reset! result (<! foo))
             (is (= 123 @result)) 
             (done)))))

looks right now

just a toy test, now I can build on this

I'd like to implement eval-sexp in AceEditor, for cljs project. Does someone know if this has already been implemented somewhere, just trying to save time.

Basically just select beginning and end parenthesis of s-exp that the cursor is placed at, at any given moment.

Are there some common errors that cause the browser to go "SyntaxError: expected expression, got ')' [learn more] void();:1:5"? There's no hand-written js code in my project, it's all cljs.

not that I’m aware

there’s not enough information here to know what might be going wrong

Ok. I guess I'll keep trying stuff. Weirdly enough, I get that message, but it doesn't break anything. Maybe it's in a js dependency...

browser should tell you which file the error came from

JS dev console

@dnolen: sadly "void();:1:5" is the "file position" it tells me ^^

try a different browser

Safari, Chrome, Firefox all can give slightly different, and slightly more useful errors depending on the case

also try clearing your lein cache (if you're using lein) and try a different browser (to avoid weird browser caching issues)

looking for recommendations for a library to use to do Capybara-style tests that drive the browser.

Hi. I would love to use materialize with reagent-ui in building my clojurescript SPA. Can I just import materialize as a library into the main html file while using reagent-ui or will I have to use material-ui?

looks like you could do either