Is there a known bug with Compose for web and inhe...

# compose-web

[CLOVIS]

Is there a known bug with Compose for web and inheritance?

I have something like

interface Parent {
  @Composable
  fun render(...)
}

class Child {
  @Composable
  override fun render(...)
}

Calling the render function on a child leads to:

Uncaught TypeError: $localVariable.render$composable_49qbjn_k$ is not a function
    at eval (Navigation.kt?fd6e:149:17)

After inspecting the object, its prototype has a 'render_4kj0y7_k$' function. Did something go wrong when Compose/Kotlin mangled the object?

Adding @JvmName("render") to the parent class changes the function name in the error message, but it doesn't change which functions the object implements (its prototype still has `'render_4kj0y7_k$'`and not 'render')

[jw]

Are you running the compiler against both source files? Are they in the same compilation unit or separate?

[CLOVIS]

They are both in the same Gradle project, however the interface is in commonMain and the implementation is in jsMain

[CLOVIS]

Ah, no, they're both in commonMain

• Abstract method: https://kotlinlang.slack.com/archives/C01F2HV7868/p1653233265875689
• both implementations are in https://gitlab.com/opensavvy/clovis/-/blob/25-webpack/utils.ui/src/commonMain/kotlin/clovis.ui/navigation/Builders.kt

It's far from being a minimal reproduction repo though, so please tell me if you need any more info

[Grégory Lureau]

KotlinJs had a mangling issue on 1.6.20 (fixed on 1.6.21) but looks like you're on 1.5.31 (not sure if this version also had mangling issues, but maybe worth trying an upgrade).

[Oleksandr Karpovich [JB]]

@CLOVIS thanks for reporting.
https://github.com/JetBrains/compose-jb/issues/2067 - here I added a more simple repro sample.

[CLOVIS]

@Grégory Lureau I should be on 1.6.21. Maybe you looked at the main branch (no problems there)?

Otherwise, there might be something wrong in the config somewhere

[CLOVIS]

@Oleksandr Karpovich [JB] thanks, following the issue.