Jetpack Compose stability in a KMM project I’m cu...

# compose

[svenjacobs]

Jetpack Compose stability in a KMM project

I’m currently writing a KMM application where I use Jetpack Compose on the Android side. Of course most of the business logic, the ViewModels and data classes are placed in the shared module under commonMain. Now I have the problem that the Compose compiler determines all of my (immutable) data classes as unstable because they are placed in a different module. I cannot add the Compose runtime dependency to commonMain because this is not a multiplatform dependency and the project just won’t compile when doing so. Of course I could add wrapper classes like described in the linked article and use them only for Android, but this would mean I would have to start using generic types in my ViewModels extensively to ensure that I still share most of the business logic. Isn’t there another way of telling the Compose compiler which classes are actually immutable/stable, maybe via command line arguments or a configuration similar to ProGuard/R8?

I’m using version 1.3.0 of Compose compiler.

[jw]

Use the jetbrains compose runtime dependency in commonMain which will give you access to the annotations

[svenjacobs]

Thanks Jake, I tried that like I wrote above 😉 but then I get the following error when syncing the project in AS:

:shared:iosArm64Main: Could not resolve org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4.
Required by:
    project :shared > androidx.compose.runtime:runtime:1.3.0-beta01

[svenjacobs]

Ok, I fixed this by specifying the dependency as

implementation("androidx.compose.runtime:runtime:1.3.0-beta01") {
    exclude(group = "org.jetbrains.kotlinx")
}

I had to figure out the right syntax because actually I’m using Gradle version catalogs but this seems to be not well supported in a multiplatform project.

implementation(libs.androidx.compose.runtime) {
    exclude(group = "org.jetbrains.kotlinx")
}

wasn’t working because implementation doesn’t provide this overload as well as

implementation(variantOf(libs.androidx.compose.runtime) { exclude(group = "org.jetbrains.kotlinx") })

which I’ve seen in a few examples wasn’t working either because variantOf isn’t known 🤷🏼

[ste]

You are using the androidx.compose one - he meant org.jetbrains.compose

[svenjacobs]

Oops, sorry 🙈 Thanks for the clarification!

[svenjacobs]

I’m sorry, me again. Adding

val commonMain by getting {
    dependencies {
        ... other dependencies here
        implementation(libs.jetbrains.compose.runtime)
    }
}

where libs.jetbrains.compose.runtime points to org.jetbrains.compose.runtime:runtime:1.1.1 now gives me:

:shared:iosArm64Main: Could not resolve org.jetbrains.compose.runtime:runtime:1.1.1.

[Marko Novakovic]

I have same problem but am getting:

Unable to find method ''void org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions.setUseIR(boolean)''
'void org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions.setUseIR(boolean)'

I gave up on it for the time being 😄

[svenjacobs]

Interestingly when using the alpha version org.jetbrains.compose.runtime:runtime:1.2.0-alpha01-dev620 this only gives me dependency errors for iOS Simulator. When commenting everything out in build.gradle.kts related to iosSimulator, the project does sync. But this cannot be the solution… 😐

[Marko Novakovic]

But this cannot be the solution…

yes…
but thanks, I will try this just to see compose compiler metrics

[svenjacobs]

I found a newer alpha version of the dependency which is not on Maven Central: org.jetbrains.compose.runtime:runtime:1.2.0-alpha01-dev774. You need to add the repository first, for example in root `build.gradle.kts`:

allprojects {
    repositories {
        google()
        mavenCentral()
        // Add this
        maven("<https://maven.pkg.jetbrains.space/public/p/compose/dev/>")
    }
}

This version works with iOS Simulator, too.

[mkrussel]

I defined expected declarations for the annotations and then used type aliases on Android and created new annotations on iOS.

[svenjacobs]

That’s also a viable solution 👍🏼