Wasmjs seems broken for me, can reproduce with pro...

# compose-web

[Stan van der Bend]

Wasmjs seems broken for me, can reproduce with project generated by the KMP project wizard.

Chrome: Version 131.0.6778.205 (Official Build) (arm64)
Deps:

[versions]
androidx-lifecycle = "2.8.4"
compose-multiplatform = "1.7.0"
junit = "4.13.2"
kotlin = "2.1.0"

Created an issue:
https://youtrack.jetbrains.com/issue/KT-74169/WasmJS-coroutines-error

[Stan van der Bend]

Error:

composeApp.uninstantiated.mjs:185 JsException: Exception was thrown while running JavaScript code
kotlinx.coroutines.error_$external_fun	@	composeApp.uninstantiated.mjs:185
$kotlinx.coroutines.error_$external_fun__externalAdapter	@	510710f….wasm:0x311633
$kotlinx.coroutines.internal.propagateExceptionFinalResort	@	510710f….wasm:0x311f02
$kotlinx.coroutines.internal.handleUncaughtCoroutineException	@	510710f….wasm:0x3058fa
$kotlinx.coroutines.handleCoroutineException	@	510710f….wasm:0x2e5e29
$kotlinx.coroutines.StandaloneCoroutine.handleJobException	@	510710f….wasm:0x2e23d7
$kotlinx.coroutines.JobSupport.finalizeFinishingState	@	510710f….wasm:0x2e922a
$kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath	@	510710f….wasm:0x2eb6d8
$kotlinx.coroutines.JobSupport.tryMakeCompleting	@	510710f….wasm:0x2eb4b2
$kotlinx.coroutines.JobSupport.makeCompletingOnce	@	510710f….wasm:0x2eb373
$kotlinx.coroutines.AbstractCoroutine.resumeWith	@	510710f….wasm:0x2e1eab
$kotlin.coroutines.CoroutineImpl.resumeWith	@	510710f….wasm:0x26976d
$kotlinx.coroutines.DispatchedTask.run	@	510710f….wasm:0x307195
$androidx.compose.ui.platform.FlushCoroutineDispatcher$dispatch$slambda$lambda.invoke	@	510710f….wasm:0x4e0274
$androidx.compose.ui.platform.FlushCoroutineDispatcher$dispatch$slambda$lambda.invoke	@	510710f….wasm:0x4e027f
$androidx.compose.ui.platform.FlushCoroutineDispatcher.performRun	@	510710f….wasm:0x4e0dc2
$androidx.compose.ui.platform.FlushCoroutineDispatcher$dispatch$slambda.doResume	@	510710f….wasm:0x4e04a4
$androidx.compose.ui.platform.FlushCoroutineDispatcher$dispatch$slambda.invoke	@	510710f….wasm:0x4e03f4
$androidx.compose.ui.platform.FlushCoroutineDispatcher$dispatch$slambda.invoke	@	510710f….wasm:0x4e043e
$kotlin.coroutines.intrinsics.<no name provided>.doResume	@	510710f….wasm:0x269c93
$kotlin.coroutines.CoroutineImpl.resumeWith	@	510710f….wasm:0x2696b2
$kotlinx.coroutines.DispatchedTask.run	@	510710f….wasm:0x307195
$kotlinx.coroutines.MessageQueue.process	@	510710f….wasm:0x310cb2
$kotlinx.coroutines.WindowMessageQueue$process$ref.invoke	@	510710f….wasm:0x31181a
$kotlinx.coroutines.WindowMessageQueue$process$ref.invoke	@	510710f….wasm:0x311824
$kotlin.js.__callFunction_(()->Unit)	@	510710f….wasm:0x264ffc
eval	@	composeApp.uninstantiated.mjs:125
Promise.then		
eval	@	composeApp.uninstantiated.mjs:187
kotlinx.coroutines.__callJsClosure_(()->Unit)	@	composeApp.uninstantiated.mjs:188
$kotlinx.coroutines.__JsClosureToKotlinClosure_(()->Unit).invoke	@	510710f….wasm:0x311a16
$kotlinx.coroutines.__JsClosureToKotlinClosure_(()->Unit).invoke	@	510710f….wasm:0x311a1e
$kotlinx.coroutines.WindowMessageQueue.schedule	@	510710f….wasm:0x311947
$kotlinx.coroutines.MessageQueue.enqueue	@	510710f….wasm:0x310c1b
$kotlinx.coroutines.WindowDispatcher.dispatch	@	510710f….wasm:0x310235
$kotlinx.coroutines.JsMainDispatcher.dispatch	@	510710f….wasm:0x30f97a
$kotlinx.coroutines.internal.resumeCancellableWith	@	510710f….wasm:0x306908
$kotlinx.coroutines.intrinsics.startCoroutineCancellable	@	510710f….wasm:0x309bec
$kotlinx.coroutines.intrinsics.startCoroutineCancellable$default	@	510710f….wasm:0x309c2a
$kotlinx.coroutines.CoroutineStart.invoke	@	510710f….wasm:0x2e65c9
$kotlinx.coroutines.AbstractCoroutine.start	@	510710f….wasm:0x2e1f9f
$kotlinx.coroutines.launch	@	510710f….wasm:0x2e22b1
$kotlinx.coroutines.launch$default	@	510710f….wasm:0x2e22e6
$androidx.compose.ui.platform.GlobalSnapshotManager.ensureStarted	@	510710f….wasm:0x4e14fa
$androidx.compose.ui.scene.BaseComposeScene.<init>	@	510710f….wasm:0x4e6c09
$androidx.compose.ui.scene.CanvasLayersComposeSceneImpl.<init>	@	510710f….wasm:0x4e96e5
$androidx.compose.ui.scene.CanvasLayersComposeScene	@	510710f….wasm:0x4e7e04
$androidx.compose.ui.scene.CanvasLayersComposeScene$default	@	510710f….wasm:0x4e7e9d
$androidx.compose.ui.window.ComposeWindow.<init>	@	510710f….wasm:0x4f4dd7
$androidx.compose.ui.window.ComposeViewport	@	510710f….wasm:0x4f2899
$org.example.project.main	@	main.kt:9
$_initialize	@	510710f….wasm:0x5a5815
instantiate	@	composeApp.uninstantiated.mjs:4481
await in instantiate		
eval	@	composeApp.mjs:6
await in eval		
__webpack_require__.a	@	composeApp.js:447
eval	@	composeApp.mjs:1
./kotlin/composeApp.mjs	@	composeApp.js:332
__webpack_require__	@	composeApp.js:381
(anonymous)	@	composeApp.js:1516
(anonymous)	@	composeApp.js:1519
webpackUniversalModuleDefinition	@	composeApp.js:17
(anonymous)

[Stan van der Bend]

This may be specific to os-x chrome, it works on Version 131.0.6778.205 (Official Build) (64-bit) on my windows pc.

[Stan van der Bend]

NEVERMIND I had hardware acceleration turned off 😄 turning that back on fixed it!

[Artem Kobzar]

Because you have 2.1.0, could you please provide the next compiler flag:

kotlin {
    wasmJs {
        compilerOptions {
            freeCompilerArgs.add("-Xwasm-attach-js-exception")
        }
    }
}

It will show you what is the original JS exception was thrown (on Chrome it should work)