Issues with using core.async from clojurescript

[mvarela]

I’m trying to use core.async from a clojurescript project, and for some reason, the compilation fails, complaining about the cljs.core.async namespace being missing. I’m just starting out with cljs tooling, so I’m a bit lost at the moment.

My deps.edn is as follows

{:deps {org.clojure/clojure {:mvn/version "1.10.1"}
        org.clojure/clojurescript {:mvn/version "1.10.520"}
        com.bhauman/rebel-readline-cljs {:mvn/version "0.1.4"}
        com.bhauman/figwheel-main {:mvn/version "0.2.3"}
        org.clojure/core.async {:mvn/version "0.4.500"}
        reagent {:mvn/version "0.8.1"}}
 :paths ["src" "resources" "target"]
 :aliases {:fig {:extra-deps
                  {com.bhauman/rebel-readline-cljs {:mvn/version "0.1.4"}
                   com.bhauman/figwheel-main {:mvn/version "0.2.3"}}
                 :extra-paths ["target" "test"]}
           :build {:main-opts ["-m" "figwheel.main" "-b" "dev" "-r"]}
           :min   {:main-opts ["-m" "figwheel.main" "-O" "advanced" "-bo" "dev"]}
           :test  {:main-opts ["-m" "figwheel.main" "-co" "test.cljs.edn" "-m" "csio.test-runner"]}}}

And my ns form:

(ns ^:figwheel-hooks fi.varela.rtc
  (:require
   [goog.dom :as gdom]
   [reagent.core :as reagent :refer [atom]]
   [promesa.core :as p]
   [cljs.core.async :as async]
   [fi.varela.utils.audio :as a]
   [cljs.pprint :as pprint])
  (:require-macros [cljs.core.async.macros :as async-m]))

And this is what I’m getting:

[Figwheel:WARNING] Compile Exception   src/fi/varela/rtc.cljs   line:6  column:5

  No such namespace: cljs.core.async, could not locate cljs/core/async.cljs, cljs/core/async.cljc, or JavaScript source providing "cljs.core.async" in file src/fi/varela/rtc.cljs

   1  (ns ^:figwheel-hooks fi.varela.rtc
   2    (:require
   3     [goog.dom :as gdom]
   4     [reagent.core :as reagent :refer [atom]]
   5     [promesa.core :as p]
   6     [cljs.core.async :as async]
          ^---
   7     [fi.varela.utils.audio :as a]
   8     [cljs.pprint :as pprint])
   9    (:require-macros [cljs.core.async.macros :as async-m]))
  10  

I suspect I’m doing something quite stupid, but I can’t quite figure out what, exactly. Any help would be appreciated!

[lilactown]

The namespace is clojure.core.async not cljs.core.async.

[mvarela]

That’s strange. In all example cljs code I’ve seen using core.async, they always require it as cljs.core.async, and that namespace is in the repo (here).

[thheller]

@lilactown

The namespace is clojure.core.async not cljs.core.async .

No, it is cljs.core.async. clojure.core.async is just aliased to cljs.core.async automatically.

Not sure about the error though. Looks correct to me. Maybe you didn’t restart figwheel-main after adding the dependency?

[mvarela]

Thanks @thheller! I’m pretty sure (though not 100%) I did restart everything, but I’ll give that a go when I’m back in the office. In the meantime, I got around my issue by using Promesa.

Btw, I just got my first taste of shadow-cljs earlier today, it’s great! Thanks for that as well!