Hi, I tried to add languageSettings to android sou...

# multiplatform

[louiscad]

Hi, I tried to add languageSettings to android sourceSets for an experimental annotation, unccessfully, following the example there: https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#language-settings

I tried the following:

kotlin {
    sourceSets {
        filter { it.name.startsWith("android") }.forEach {
            it.languageSettings.apply {
                useExperimentalAnnotation("kotlin.Experimental")
            }
        }
    }
}

but I'm getting an error because the test sourceSets defined by the Android Gradle plugin (version 3.3.1) don't have the experimental annotation.
How can I solve that issue to enable this experimental annotation in my android source sets defined my Kotlin multiplatform gradle plugin?

The exact error message is the following:

Inconsistent settings for Kotlin source sets: 'androidDebugAndroidTest' depends on 'androidAndroidTest'
'androidDebugAndroidTest': set of experimental annotations in use is []
'androidAndroidTest': set of experimental annotations in use is [kotlin.Experimental]
The dependent source set must use all experimental annotations that its dependency uses.

[h0tk3y]

I believe some of the source sets are not yet created during the project evaluation phase, so your code doesn't add the experimental annotation to them.

[h0tk3y]

As Android variants are created in afterEvaluate, some of the Kotlin MPP model parts are also only available late in project configuration.

[h0tk3y]

I suppose this should help: replace filter { ... }.forEach { ... } with matching { ... }.all { ... }

[h0tk3y]

kotlin {
    sourceSets {
        matching { it.name.startsWith("android") }.all {
            it.languageSettings.apply {
                 useExperimentalAnnotation("kotlin.Experimental")
            }
        }
    }
}

[h0tk3y]

matching + all will apply the lambda to the items that are not created yet, once they are created.

[louiscad]

I just had to remove the it. in the lambda because the Action lambda passed to all { ... } is a receiver.
It now works perfectly, thanks for your help!