Incompatible with current ClojureScript (1.9.562)

[Peeja]

The serverless template (and probably the main cljs-lambda template as well) is incompatible with the current (1.9.562) version of ClojureScript. Builds fail because java.lang.AssertionError: Assert failed: :nodejs target with :none optimizations requires a :main entry.

I've tried adding my .core namespace as the :main. Bizarrely, that leads to:

Exception in thread "main" java.lang.ClassNotFoundException:
[…]
Caused
     by: java.lang.ClassNotFoundException:<project-name>.core
        at
     java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at
     clojure.lang.DynamicClassLoader.findClass(DynamicClassLoader.java:69)
        at
     java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at
     clojure.lang.DynamicClassLoader.loadClass(DynamicClassLoader.java:77)
        at
     java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at
     java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at
     clojure.lang.RT.classForName(RT.java:2168)
        at clojure.lang.RT.classForName(RT.java:2177)
        at
     clojure.lang.Compiler.resolveIn(Compiler.java:7145)
        at
     clojure.lang.Compiler.resolve(Compiler.java:7108)
        at
     clojure.lang.Compiler.analyzeSymbol(Compiler.java:7069)
        at
     clojure.lang.Compiler.analyze(Compiler.java:6648)
        ...
     30 more

(where <project-name> is the name of the project)

It looks like Clojure is trying to find the namespace instead of ClojureScript? I have no idea what's going on at this point.

[moea]

Thanks for reporting - when I update the template to point to a newer cljs I'll add in a default :main (or default to :simple).

As far as your attempt to fix it, I haven't seen this specific issue, though I've previously had issues with the compiler being weird about symbols being used for the namespace passed to :main instead of strings.

I can take a look at the project if that's helpful.

[Peeja]

Ah, :simple works great! Thanks.

[arichiardi]

Adding :main works also for :none in 1.9.854. Weird that we need it though, I guess compiling for lambda was not considered as use case in ClojureScript compiler :smile:

[tobowers]

hmm when I added :main :simple, the build worked but then I got:

2017-10-06T11:16:06.611Z    be1d2fbc-aa87-11e7-a553-ed5b451ac831    goog.require could not find: _COLON_simple

[tobowers]

oh I see... optimizations :simple not :main :simple

[j0ni]

@Peeja I found setting the :cljs-lambda/:compiler/:options/:main key to clojure.core/identity made that issue go away - the language in the message gives you a clue, but I also initially assumed it was a top level key.

edit: but that may just push the problem downstream to runtime I think.

[JimLynchCodes]

Hi, great discussion, thanks. However, when I upgrade to clojurescript 1.10.64 and clojure 1.9.0, but even when I try to change :optimizations to :simple or :main I am getting errors compiling:

Exception in thread "main" java.lang.AssertionError: Assert failed: :source-map true must specify a file in the same directory as :output-to "target/my_proj/my_proj.js" if optimization setting applied
(or (nil? (:output-to opts)) (:modules opts) (string? source-map)), compiling:(/private/var/folders/41/b5ntx4mn2mv9qk3jy

[moea]

@JimTheMan the semantics of source-map change at different optimization levels: https://clojurescript.org/reference/compiler-options#source-map

[the-frey]

Just so it's clearly and explicitly documented, this project.clj solved the issue for me:

(defproject example "0.1.0-SNAPSHOT"
  :dependencies [[org.clojure/clojure       "1.9.0"]
                 [org.clojure/clojurescript "1.10.312"]
                 [io.nervous/cljs-lambda    "0.3.5"]]
  :plugins [[lein-npm                    "0.6.2"]
            [io.nervous/lein-cljs-lambda "0.6.6"]]
  :npm {:dependencies [[serverless-cljs-plugin "0.1.2"]]}
  :cljs-lambda {:compiler
                {:inputs  ["src"]
                 :options {:output-to     "target/example/example.js"
                           :output-dir    "target/example"
                           :target        :nodejs
                           :language-in   :ecmascript6
                           :optimizations :simple}}})

[the-frey]

Is there somewhere I should issue a PR or something?

[moea]

I'm happy to accept a pr - the leiningen template would be the place to put the change

On Fri, 22 Jun 2018, 18:53 the-frey, notifications@github.com wrote:

Is there somewhere I should issue a PR or something?

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