hello folks, i inherited a cljs code base that is built using figwheel. i recently ran into an issue where the JS output file would work fine on my local development machine but have all these strange broken buttons on my QA server. I noticed that the difference between the two JS output files was that the one i was testing with had optimizations set to none but the QA server was using optimizations advanced. so, the next reasonable thing for me was to try building with advanced optimizations and test on my local dev machine. the build works but i run into an error on the browser:

goog.require could not find: env.web.config

Analyzing env/dev/env/web/config.cljs
Compiling ....../parser.cljs, elapsed time: 917.850835 msecs

{:id "web"
                 :source-paths ["src" "env/dev"]
                 :compiler{:main ...
                           :output-to "resources/public/main.js"
                           :output-dir "resources/public/js"
                           :optimizations :whitespace
                           :parallel-build true
                           :compiler-stats true
                           :verbose true
                           :externs ["resources/lib/ext/webview-bridge.ext.js"]
                           :source-map "resources/public/main.map.js"
                           :source-map-timestamp true}}

Hello everyone, how can I read environment variables in Clojurescript?

depends on your target

with node target, just use js/process.env, with a browser target you need to write a macro that reads env variables in Clojure and outputs them to cljs

There's environment variables in the browser? :thinking_face:

environment variable is in system environment variable set using 'export'

@kristian507 no 🙂 but you could use env variables at compile-time for config etc

@dsuren I wrote a post a while back about accessing Clojure data in ClojureScript, maybe you’ll find some useful information there: https://cjohansen.no/optimized-optimus-asset-paths-clojurescript/

env vars are simpler, but it is the same basic approach

Is this open ticket still accurate - that cljs.spec data is included in :advanced builds? is there a recommended way to use spec with ClojureScript without impacting build sizes? https://dev.clojure.org/jira/browse/CLJS-1701

I don't recall anything changing there @mhuebert

@mfikes ok

is cljs.analyzer.api the official analyzer for clojurescript ?

@leonoel Docstring for that namespace: "This is intended to be a stable api for those who need programmatic access to the analyzer."

would it be a recommended thing to define specs in test namespaces (if not using them for anything at runtime)?

@mhuebert I haven't tried this, but it might be possible to guard some stuff with goog/DEBUG to have it DCE'd during :advanced (That way you could leave things roughly where they are, but just guard them.)

I'm curious if (if goog/DEBUG (s/def ::foo int?)) is sufficient, or if that still leaves anything in the spec registry

Seems like a gross solution if it does work, and the compiler would ideally just take care of it for you.

Anybody know how to deal with :npm-deps producing duplicate dependencies? I have two node modules that depend on the same package and it's resulting in two goog.provide for the same package which in turn throws an err

@bill_rubin Might be worth taking a look at https://dev.clojure.org/jira/browse/CLJS-2402 to see if it is the same issue

@mfikes Thanks, seems like the patch works

Cool @bill_rubin if you can, add a comment in that JIRA and also perhaps vote for it.

@mfikes ok will do if I don't discover any new issue

Hey everyone! Has anyone written an Electron app in clojurescript? What was the experience like?

I am building a server-side application with some CSS and JavaScript sprinkled on top (not an SPA). I am wondering if there's a way to have my ClojureScript in the same file as my server Clojure file. I am doing that successfully with CSS using https://github.com/noprompt/lein-garden#chapter-2... as you can see :stylesheet cash-money.core/screen I am pointing to the exact function path. Is there something like this with ClojureScript where a function gets compiled into a separate file? What are my options?

does anyone here have any experience registering a client to receive events from a server?

i'm not really sure how that works

like, I've seen some js libraries where you call some function that returns an observable object that you can register a callback on, but I don't really know what exactly the server is doing to make that happen