Regarding running just one test with shadow-cljs. Thanks @wxitb2017 and @thheller for the help yesterday! In the end I built upon with Lucy’s code and added the functionality to provide several substrings that the test is matched against. I put the code in a gist in case it’s of use to someone else: https://gist.github.com/johesoman/16d765d158e0018ed20f9aafc6d4501f

what's a good way to diagnose an error that only occurs when --debug is not passed during app release?

tried shadow-cljs check?

likely a externs issue yes

btw why does shadow-cljs check reports cljs.core.PersistentArrayMap expressions are not callable as a warning?

I do that all the time 😄

not sure I know which warning you mean?

check in general reports many false positives and non-issues

that why its not documented anywhere 😛

it can be useful to find issues but its definitely not user friendly

@chris358 --debug also turns on :pseudo-names which still renames everything but uses longer names that are less likely to clash with anything

so if your app has issues without that it is likely that you maybe have something in the page that defines a global variable or so that then clashes with the CLJS code

one common issue in the past for example is google analytics that creates that the closure compiler would also use unless you had externs telling it not to

with :output-wrapper defaulting to true nowadays thats less of an issue

but can still happen. js->clj is also known to cause issues so if you use that with a lot of JS data that can be another cause

interesting, thanks for the pointers!

it started happening after i slurped in a few new libraries so a global name clash could indeed be the cause.

I'm working on my application, using shadow-cljs, with the bootstrap cljs support ... And if I serve the index.html via my own server (instead of the embedded shadow-cljs dev http server), I see an error from (I think) the bootstrap cljs stuff trying to load resources over a websocket. But I can't exactly see what it is trying to do or request - is there any advice on how I should debug this? It's perplexing, but if these resources fail to load, my bootstrap cljs eval stuff stops working.

bootstrap doesn't load anything over websocket

just look at the browser console. it should be making regular XHR requests to get the files.

I am looking at the console. It isn't totally evident what is being done. Here, for example, is the error from the console:

Uncaught SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at Transit$JSONUnmarshaller.reader.JSONUnmarshaller.unmarshal (reader.js:39)
    at Transit$Reader.reader.Reader.read (reader.js:59)
    at Object.cognitect$transit$read [as read] (transit.cljs:137)
    at Object.shadow$cljs$bootstrap$browser$transit_read [as transit_read] (browser.cljs:23)
    at .XhrIo.G__63340 (browser.cljs:33)
    at goog.net.XhrIo.goog.events.EventTarget.fireListeners (eventtarget.js:285)
    at Function.goog.events.EventTarget.dispatchEventInternal_ (eventtarget.js:383)
    at goog.net.XhrIo.goog.events.EventTarget.dispatchEvent (eventtarget.js:196)
    at .XhrIo.onReadyStateChangeHelper_ (xhrio.js:871)

Not exactly super clear.

just look at the request it made

and click the url it requested to open in a new tab

it expects a JSON response but likely your server returned HTML instead?

Ah, no, I think it's because I don't understand the ... I'm not sure the right term, I'm not sure how the paths are constructed.

So it's asking for the resource (I think): http://localhost:8098/bootstrap/index.transit.json

And not (for example) js/bootstrap/ ...

so you are on http://localhost:8098

Yes (I am on localhost 8098)

yes the path it requests defaults to /bootstrap

I don't understand why some requests are /js/... and these are /bootstrap

Are there any knobs on my end that can control that?

you can configure the path in the boot/init call you do

just {:path "/wherever"} in the map you already pass in

Ah perfect, let me see if I can do it that way instead of by adding another route on the server ...

you can put it wherever you want

the default is just /bootstrap just config :path "/js/bootstrap" if thats the dir you are putting the files in currently

@thheller Thank you so much. I don't know how many hours that would have taken me to figure out.

That works perfectly.

hi, when I run shadow-cljs in a particular project it gives "java heap memory.." error on windows. how can i increase the memory limit

this one https://github.com/flexsurfer/rn-shadow-steroid

@m373h4n "java heap memory.." ?

like this

Exception in thread "async-thread-macro-1" java.lang.OutOfMemoryError: Java heap space
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.privateGetPublicMethods(Unknown Source)
        at java.lang.Class.privateGetPublicMethods(Unknown Source)
        at java.lang.Class.getMethods(Unknown Source)
        at clojure.lang.Reflector.getMethods(Reflector.java:498)
        at clojure.lang.Reflector.invokeNoArgInstanceMember(Reflector.java:436)
        at shadow.cljs.devtools.server.fs_watch_jvm$poll_changes.invokeStatic(fs_watch_jvm.clj:17)
        at shadow.cljs.devtools.server.fs_watch_jvm$poll_changes.invoke(fs_watch_jvm.clj:16)
        at clojure.core$map$fn__5866.invoke(core.clj:2753)
        at clojure.lang.LazySeq.sval(LazySeq.java:42)
        at clojure.lang.LazySeq.seq(LazySeq.java:51)
        at clojure.lang.RT.seq(RT.java:535)
        at clojure.core$seq__5402.invokeStatic(core.clj:137)
        at clojure.core$apply.invokeStatic(core.clj:660)
        at clojure.core$mapcat.invokeStatic(core.clj:2783)
        at clojure.core$mapcat.doInvoke(core.clj:2783)
        at clojure.lang.RestFn.invoke(RestFn.java:423)
        at shadow.cljs.devtools.server.fs_watch_jvm$watch_loop.invokeStatic(fs_watch_jvm.clj:46)
        at shadow.cljs.devtools.server.fs_watch_jvm$watch_loop.invoke(fs_watch_jvm.clj:33)
        at shadow.cljs.devtools.server.fs_watch_jvm$start$fn__7286.invoke(fs_watch_jvm.clj:77)
        at clojure.core.async$thread_call$fn__3186.invoke(async.clj:484)
        at clojure.lang.AFn.run(AFn.java:22)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

thats very odd. never seen that before.

do you have like a billion files on the classpath?

i checked there are 39.604 files and 5528 folders ( i don't know what is classpath)

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

thank you

Does (js/require …) work with shadow to require local .js files or can I only require them in the namespace?

depends on the target you are using?

browser builds only support require in ns. node you can just use js/require

How about react-native? 🙂

that should be fine, already works for images

@m373h4n how much ram does you machine have? you can tune the memory settings via :jvm-opts ["-Xmx2G"] (for max 2GB ram) in top level shadow-cljs.edn. need to configure via project.clj/deps.edn if you use those.

but it is odd that its running out of memory in places that aren't very memory intense

just make sure you don't have node_modules or so in your classpath

i have 16gb ram

then it should be allowed to use 4GB with default memory rules

that is more than enough

are you just generally out of ram maybe? too much other stuff using everything up?

so :jvm-opts ["-Xmx2G"] for 2gb right

you probably want to tune the memory DOWN then

so try -Xmx1G

ok

it worked 🙂

is there a quick command for reloading the s-cljs server after making changes to the shadow-cljs.edn file or do I just need to restart it?