Clojurians Log v2

I don't use them for anything special, other than visualizing in source tree which commit is which release. It's only useful for people looking at the source code.

Is the usage of ^:const (e.g. in (def ^:const my-var 3000)) still justified when using shadow-cljs?

^:const is probably the most misunderstood feature in CLJ(S) so I would avoid it. but you can use it if you must.

Hi total newbie here. Just trying out shadow-cljs, but can’t seem to get past the intial step, am getting a binding error. [2021-04-05 15:44:22.985 - WARNING] :shadow.cljs.devtools.server/socket-repl-ex BindException Can’t assign requested address (Bind failed) http://java.net.PlainSocketImpl.socketBind (PlainSocketImpl.java:-2) http://java.net.AbstractPlainSocketImpl.bind (AbstractPlainSocketImpl.java:387) http://java.net.ServerSocket.bind (ServerSocket.java:375) http://java.net.ServerSocket.<init> (ServerSocket.java:237) shadow.cljs.devtools.server.socket-repl/start (socket_repl.clj:123) shadow.cljs.devtools.server.socket-repl/start (socket_repl.clj:115) shadow.cljs.devtools.server/start-system/fn--17877 (server.clj:233) shadow.cljs.devtools.server/start-system (server.clj:232) shadow.cljs.devtools.server/start-system (server.clj:202) shadow.cljs.devtools.server/start! (server.clj:483) shadow.cljs.devtools.server/start! (server.clj:385) shadow.cljs.devtools.server/start! (server.clj:388) BindException: Can’t assign requested address (Bind failed) http://java.net.PlainSocketImpl.socketBind (PlainSocketImpl.java:-2) http://java.net.AbstractPlainSocketImpl.bind (AbstractPlainSocketImpl.java:387) http://java.net.ServerSocket.bind (ServerSocket.java:375) http://java.net.ServerSocket.<init> (ServerSocket.java:237) shadow.cljs.devtools.server.socket-repl/start (socket_repl.clj:123) shadow.cljs.devtools.server.socket-repl/start (socket_repl.clj:115) shadow.cljs.devtools.server/start-system (server.clj:248) shadow.cljs.devtools.server/start-system (server.clj:202) shadow.cljs.devtools.server/start! (server.clj:483) shadow.cljs.devtools.server/start! (server.clj:385) shadow.cljs.devtools.server/start! (server.clj:388) shadow.cljs.devtools.server/start! (server.clj:385) shadow.cljs.devtools.server/from-cli (server.clj:615) shadow.cljs.devtools.server/from-cli (server.clj:591) clojure.lang.Var.applyTo (Var.java:705) clojure.core/apply (core.clj:665) clojure.core/apply (core.clj:660) shadow.cljs.devtools.cli-actual/lazy-invoke (cli_actual.clj:23) shadow.cljs.devtools.cli-actual/lazy-invoke (cli_actual.clj:20) shadow.cljs.devtools.cli-actual/blocking-action (cli_actual.clj:129) shadow.cljs.devtools.cli-actual/blocking-action (cli_actual.clj:116) shadow.cljs.devtools.cli-actual/main (cli_actual.clj:177) shadow.cljs.devtools.cli-actual/main (cli_actual.clj:132) clojure.core/apply (core.clj:669) clojure.core/apply (core.clj:660) shadow.cljs.devtools.cli-actual/-main (cli_actual.clj:219) shadow.cljs.devtools.cli-actual/-main (cli_actual.clj:217) clojure.lang.Var.applyTo (Var.java:705) clojure.core/apply (core.clj:665) clojure.core/apply (core.clj:660) shadow.cljs.devtools.cli/-main (cli.clj:75) shadow.cljs.devtools.cli/-main (cli.clj:67) clojure.lang.Var.applyTo (Var.java:705) clojure.core/apply (core.clj:665) clojure.main/main-opt (main.clj:514) clojure.main/main-opt (main.clj:510) clojure.main/main (main.clj:664) clojure.main/main (main.clj:616) clojure.lang.Var.applyTo (Var.java:705) clojure.main.main (main.java:40)

what binding error?

Sorry first time using slack and it sent the message before I had finished typing

I was using another example, but then switched to using this: https://github.com/shadow-cljs/quickstart-browser I am running on macos 11 if that is relevant

did you block it in your firewall? It needs to open a server socket so you can talk to it via the REPL etc

Not as far as I am aware, I have nothing running, checked and can’t see that 8630 port is being used

did you configure anything related to ports in shadow-cljs.edn? or is this with the default setup?

only thing I can think of is your firewall blocking it

I did on another example was learning on, but not for quick start. Just followed the commands as is. The file contents is:

;; shadow-cljs configuration
{:source-paths
 ["src/dev"
  "src/main"
  "src/test"]

 :dependencies
 []

 :dev-http
 {8020 "public"}

 :builds
 {:app
  {:target :browser
   :output-dir "public/js"
   :asset-path "/js"

   :modules
   {:main ; becomes public/js/main.js
    {:init-fn starter.browser/init}}}}}

that looks fine

My firewall is off

you can try adding :socket-repl false so it skips trying to start that

sure

but likely it'll then just fail on the next network port it tries to use

and thank you for helping

To be clear, you mean like this:

;; shadow-cljs configuration
{:source-paths
 ["src/dev"
  "src/main"
  "src/test"]

 :dependencies
 []

 :socket-repl false

 :dev-http
 {8020 "public"}

 :builds
 {:app
  {:target :browser
   :output-dir "public/js"
   :asset-path "/js"

yes

Errors out again

it tries to bind to 0.0.0.0 by default which should be localhost. I do not know why it would fail. nobody else has reported this before.

or rather 127.0.0.1 for the socket-repl. maybe you only have ipv6 configured? no ipv4 at all?

or rather it tries to bind localhost. is that maybe not configured for some reason?

Just taking a look now

try ping localhost in the terminal

Looks like something to do with my ISP

that is odd. localhost shouldn't leave you machine at all.

I don't actually know where this is configured in macos anymore. maybe still /etc/hosts?

This may be the culprit

my macbook has

$ cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost

Yes just noticed 127.0.1 was not there, added in and refreshed working now. Thank you!!!!

strange 🙂

Very, must have been cleared some point in the past, thanks again…

Is there a way to do dev-only dependencies with shadow-cljs, or do you have to integrate with deps or lein?

wouldn't dev-only dependencies be npm install <package> --save-dev?

Not if it’s a maven/deps package

@max.r.rothman the distinction is not necessary. the builds decide what is included and as such having extra but unused dependencies on the classpath do not matter

just include everything all the time. shadow-cljs.edn itself does not have the concept of dev-dependencies.

Does that happen at all optimization levels? And how then do I configure a build to not include that code (or to only include that code in one build)?

you ns :require forms control what the build will actually use for all optimization levels

the build reports will tell you in detail what your build included https://shadow-cljs.github.io/docs/UsersGuide.html#build-report

Nice! 🪄

Sounds like there’s not a way to make certain namespaces or dependencies unavailable in certain builds though? I’d have to figure out some way of scraping the build report if I wanted to check that constraint automatically?

you could also verify with a build hook. in general you want to include dev-only code via :preloads. they are not included in the release builds

most cljs libs already provide instructions to do so, if that applies

hello, i'm new and i'm using shadow-cljs with cursive, and i can't get command completion to work for a js (actually typescript) library that i installed with npm...should there be a way to make this work?

i created the project using the pom.xml as detailed here: https://shadow-cljs.github.io/docs/UsersGuide.html#_cursive

no, this is currently not support by Cursive

you must use a deps.edn or a project.clj to setup things for Clojure in Cursive

@wrokon with Cursive it's best to use deps.edn or leiningen project.clj for defining dependencies instead of shadow-cljs.edn

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

Does anyone have any experience building a project with Bazel? Apparently the best angle is to use the Closure rules but does that mean I should npm install shadow-cljs or clojurescript itself?

ok, thanks everyone, i will give it a try...for now i'm just living with all the unresolved symbols