Sudden "Critical Dependency" warning. I've been running a React app to test and develop a CLJS library built with shadow-cljs for months now with out any real issues. Throughout that time when I would compile with npx shadow-cljs compile react it would take 8-10 seconds. (Relevant shadow-cljs.edn part below). Suddenly, after a seemingly insignificant change, the compile time dropped to consistently under a second, I started seeing the following warning when running the React app in dev mode:

WARNING in ../Zephyr/zephyr/dist/cljs-runtime/cljs_env.js 1822:9-49
Critical dependency: the request of a dependency is an expression
 @ ../Zephyr/zephyr/dist/cljs-runtime/shadow.module.zephyr.prepend.js 3:0-23
 @ ../Zephyr/zephyr/dist/zephyr.js 3:0-59
 @ ./src/components/ZephyrStaticInline.js 7:0-40 33:29-40
 @ ./src/App.js 7:0-71 69:133-154
 @ ./src/index.js 11:0-24 18:35-38

:react {:target :esm
          :output-dir "dist"
          :modules {:zephyr
                    {:exports {:math        zephyr.core/math
                               :equation    zephyr.core/equation
                               :inline      zephyr.core/inline
                               :align       zephyr.core/align
                               :staticLaTeX zephyr.core/staticLaTeX}}}
          :js-options {:js-provider :import}
          :compiler-options {:infer-externs :auto
                             :output-feature-set :es2018
                             :optimizations :advanced}}

P.S. As a follow up, I checked out old branches going back well before the warning first appeared. The compile times and warning remain, which is rather surprising. An external/implicit/automatic change in dependencies? Not sure how to explain this. Thanks.

@genovese I don't know what that error means either. it is not from shadow-cljs or any code it generates. it seems to be from whatever you are using to post process the output. google suggests this https://stackoverflow.com/questions/42908116/webpack-critical-dependency-the-request-of-a-dependency-is-an-expression

and many others but the cause consistently seems to come from one of the included npm dependencies

Thanks @thheller. Webpack is definitely generating the warning, but the npm deps on the react side did not change. Since the message pointed to the cljs runtime and the shadow-cljs compile time changed so noticeably pre and post warning, I thought it might be something in the shadow-cljs generated code. I'm glad to hear that that's not the case, though. A bit of a mystery still, but... Appreciate your help.

did you check what is at ../Zephyr/zephyr/dist/cljs-runtime/shadow.module.zephyr.prepend.js 3:0-23 that location in the file?