Should generic `@Composable` `fun`s work with Comp...

# compose-web

[Norbi]

Should generic @Composable `fun`s work with Compose/Web?
I get internal compiler error in case of this function:

@Composable
fun <T> MySelect(
    options: List<T>,
    onChange: (T?) -> Unit
) ...

If I remove the generic type parameter (and replace T with Any in the parameters) then it compiles.

Kotlin: 1.5.31
Compose/Web: 1.0.0-alpha4-build366

Error message:

java.lang.IllegalStateException: FULL: FUN name:MySelect$composable visibility:public modality:FINAL <T> (options:kotlin.collections.List<T of ...component.MySelect$composable>, onChange:kotlin.Function1<T of ...component.MySelect$composable?, kotlin.Unit>, $composer:androidx.compose.runtime.Composer?, $changed:<http://kotlin.Int|kotlin.Int>) returnType:kotlin.Unit
 Ir: ...component#MySelect$composable(kotlin.collections.List<0:0>;kotlin.Function1<0:0?,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int){0�<kotlin.Any?>}
 Descriptor: ...component#MySelect$composable(kotlin.collections.List<0:0>;kotlin.Function1<0:0,kotlin.Unit>;androidx.compose.runtime.Composer?;kotlin.Int){0�<kotlin.Any?>}

[Norbi]

I reported it: https://github.com/JetBrains/compose-jb/issues/1226

[olonho]

It’s serialization + Compose plugins. Could you separate modules do that each plugin is used in its own module?

[Norbi]

The serialization plugin is not applied on the Compose/Web project:

plugins {
    kotlin("multiplatform")
    id("org.jetbrains.compose") version "1.0.0-alpha4-build366"
}

But I have a plugin block in the root project:

plugins {
    kotlin("multiplatform") version "1.5.31" apply false
    kotlin("plugin.serialization") version "1.5.31" apply false
...

Is it disallowed as well to have an unapplied serialization plugin?

[Norbi]

@olonho, I have removed the unapplied serialization plugin from the root project but the problem still exists :(

[olonho]

backtrace includes application of serialization compiler plugin, so if it is removed - backtrace shall be different

[Norbi]

@olonho, I removed every shared plugin from the root project (except for kotlin("multiplatform")) but it still fails with the same error message.
Isn't it suspicious that it works if I remove the type parameter?
These are the project.plugins (printed from afterEvaluate of the Compose/Web project):
• com.android.ide.gradle.model.builder.AndroidStudioToolingPlugin
• org.gradle.api.plugins.HelpTasksPlugin
• org.gradle.buildinit.plugins.BuildInitPlugin
• org.gradle.buildinit.plugins.WrapperPlugin
• org.jetbrains.compose.ComposeCompilerKotlinSupportPlugin
• org.jetbrains.compose.ComposePlugin
• org.gradle.language.base.plugins.LifecycleBasePlugin
• org.gradle.api.plugins.BasePlugin
• org.gradle.api.plugins.JvmEcosystemPlugin
• org.gradle.api.plugins.ReportingBasePlugin
• org.gradle.api.plugins.JavaBasePlugin$Inject
• org.jetbrains.kotlin.gradle.scripting.internal.ScriptingKotlinGradleSubplugin
• org.jetbrains.kotlin.gradle.scripting.internal.ScriptingGradleSubplugin
• org.jetbrains.kotlin.gradle.plugin.KotlinMultiplatformPluginWrapper
• org.gradle.kotlin.dsl.provider.plugins.KotlinScriptBasePlugin
• org.jetbrains.kotlin.gradle.targets.js.npm.NpmResolverPlugin
As you see, the org.jetbrains.kotlinx.serialization.gradle.SerializationGradleSubplugin is not applied (it is applied only in a project that is a dependency of the Compose/Web project).

[Norbi]

Meanwhile, the issue has been kind of "solved" 😞
https://github.com/JetBrains/compose-jb/issues/1226#issuecomment-933292157