Hi all, having a bit of trouble finding how to int...

# compose-web

[Rok Oblak]

Hi all, having a bit of trouble finding how to intercept any errors in the wasm Compose code; I just want to add some custom logging and display some html overlay.
These two don't capture it for some reason:

addEventListener("error", (event) => unhandledError(event, event.error));
addEventListener("unhandledrejection", (event) => unhandledError(event, event.reason));

Tried adding try/catch in the main function but also no luck.
The crash does get logged in the console though, and Sentry JS does capture it as well.

[Artem Kobzar]

If it's possible, could you please share what kind of errors appear in the console?

[Rok Oblak]

It's very weird to me.
One time, if I use chunked[6] to force a crash, it does not catch it in my JS handler and the console log is very undescriptive.
If I simply replace this with a listOf(1, 2, 3)[3], the crash is caught by the handler and also the console log has the entire stacktrace.

The only difference that I see is that the chunked is a computed value from an observed state.

[Rok Oblak]

this consistently causes the crash to show the entire stack + the JS handler catches it.
whereas using it on the items (which comes from the observed state) consistently does not show the stacktrace.

[Artem Kobzar]

What version of KMP plugin do you use?

[Rok Oblak]

Using 0.8.3(242)-5

[Artem Kobzar]

Are you sure it's the version of the multiplatform plugin?

[Rok Oblak]

@Artem Kobzar is it this one or am I looking at the wrong one?

[Artem Kobzar]

Oh, sorry for misunderstanding. I'm about the Gradle plugin (in the project).
You can find it either in build.gradle.kts:

plugins {
  kotlin("multiplatform") version "..."
}
...

Or in the `lib.versions.toml`:

[versions]
kotlin = "..."

[plugins]
kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }

[Rok Oblak]

Ah okay, 2.0.21, but seeing the same with 2.1.0-RC2 as well, when accessing out of bounds list element the console does not print any stacktrace

[Artem Kobzar]

I will try to reproduce it on a "Hello, World" app, it's not reproduced, I will come back to you

[Artem Kobzar]

Btw, @Rok Oblak, is. it possible that you attach the handlers late, so the app is already failed before the handlers were added?

[Rok Oblak]

I think not as this happens upon a navigation into a screen (via a button), so at that time the handlers are long past attached.

[Artem Kobzar]

I'm playing around the example: https://github.com/Kotlin/kotlin-wasm-browser-template/
With the attached patch, and seems like there it works.

unhandledrejection.patch