cljs compile warning: JavaScript file found on classpath for library `...`, but does not contain a corresponding...

Question

First, thanks for cljs, it's the best way to do frontends and it's one of the lifebloods of our business. We are super-grateful.

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I am running some older code in a new project that has an updated cljs dependency and I am now getting an interesting compile warning:

WARNING: JavaScript file found on classpath for library `goog.net.cookies`, but does not contain a corresponding `goog.provide` declaration: jar:file:/home/harold/.m2/repository/org/clojure/google-closure-library/0.0-20211011-0726fdeb/google-closure-library-0.0-20211011-0726fdeb.jar!/goog/net/cookies.js

Everything seems to be working fine, but I am still interested in cleaning up this output.

I built a simple (two tiny file) project that reproduces the problem:
- https://github.com/harold/cookie-repro
- You can clone that and then do:

lein cljsprod

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I did a 'bisect'-ish operation on the cljs deps in maven and found that the warning started to appear with version 1.10.891:
- https://github.com/clojure/clojurescript/blob/master/changes.md#110891
- Before that version, the warning is not seen

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Wondering if others have seen this warning, or similar, and what, if any, steps would be good to take.

Thanks again for your time and consideration!

Answer 1

This was not an issue with cljs at all - sorry for the noise.

For future generations of searchers, the change was in the google-closure-library, "goog.net.cookies" was deprecated and removed in favor of "goog.net.Cookies" and a more enterprise-y factory singleton getter initialization.

Link: https://github.com/google/closure-library/releases/tag/v20220301

When cljs does upgrade to newer closure library versions uses of this will break.

Thanks to everyone for your help tracking this down.

Answer 2

Do you have an explicit dependency on google-closure-library anywhere? The version in the warning is ancient. Figure out where it comes from and remove the explicit dependency - the CLJS jar specifies it itself.

Comments

Thanks! I do not (at least as far as I know), here is the project file (from the repo linked in the question): https://github.com/harold/cookie-repro/blob/main/project.clj ... the only deps are the latest versions of clj and cljs (the version number seen in the warning `20211011` is an explicit dep of cljs 1.11.60).

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Ah, huh, alright. Didn't expect for CLJS to be on such an old version, but it's probably not for a bad reason. I myself use shadow-cljs and it uses one of the most recent versions, and I've never seen that warning there.

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Ah! I didn't notice that, but you're correct that shadow-cljs excludes the cljs closure dep and brings in a different one. And I concur, I'm quite sure there are good reasons for all of this. (: Thanks for your thoughts/help.