I m getting errors when trying to run tests with some NPM de

Question

I m getting errors when trying to run tests with some NPM dependencies e g when using `kotlinx datetime` I ve got ``` gt Task wasmJsBrowserTest 404 absolute tmp karma webpack 461787 node modules js joda core dist js joda esm js js error tmp karma webpack 461787 node modules js joda core dist js joda esm js js at webpack require f j tmp karma webpack 461787 runtime js 300 29 at tmp karma webpack 461787 runtime js 161 40 at Array reduce lt anonymous gt at webpack require e tmp karma webpack 461787 runtime js 160 67 at instantiate at eval at webpack require a tmp karma webpack 461787 runtime js 91 13 at eval at kotlin kilua wasm js test mjs load 286322405 js 18 1 at Function webpack require tmp karma webpack 461787 runtime js 31 41 ``` I m on Kotlin 1 9 20 Beta2

Robert Jaros · Answer

This is a bit similar <https youtrack jetbrains com issue KT 62128 Wasm tests still do not work on Kotlin 1 9 20 Beta2> but the workaround is not working for me

Ilya Goncharov [JB] · Answer

Hi in this issue problem is with Windows paths In your case JS dependencies should be bundled via `webpack` but looks like it doesn t So probably it is another problem As I understand it is because webpack processing all dynamic imports as separate files But Karma has problem with emitting more than one file from webpack So I will investigate how we can fix Karma in such cases

Ilya Goncharov [JB] · Answer

< Robert Jaros> Hi looks like I found root cause of the problem It is because configuration of webpack inside Karma precisely `optimization` field It is necessary source maps to work correctly But it is more actual for Kotlin JS So in Kotlin Wasm I think it can be deleted yes source maps will be wrong in such case in Kotlin Wasm Workaround is following create `karma config d` to create custom script inside Karma config Create file under this folder for example `index js` with content ```delete config webpack optimization``` It should fix problem with loading of separate files for testing purposes Just as additional information I understand the reason why `karma` needs its own `optimization` setting and looks like I understand how it can be possible to work source maps with their setup so I hope it will work in next releases

Robert Jaros · Answer

Thank you The workaround works perfectly slightly smiling face