Hi! I'm experiencing an issue with `kotlin-inject-...

# kotlin-inject

[Elijah Dangerfield]

Hi! I'm experiencing an issue with kotlin-inject-anvil 0.1.6 where @ContributesBinding with multibinding across modules works for Android but not iOS.
My Setup:
• Kotlin 2.2.21, KSP 2.2.21-2.0.4, kotlin-inject-anvil 0.1.6
• Multi-module KMP project (see diagram)
• Using per-target KSP configuration (kspAndroid, kspIosSimulatorArm64, etc.)
What happens:
• Feature modules generate contribution interfaces correctly in amazon.lastmile.inject package for both Android and iOS
• App module's MergeComponentProcessor finds contributions for Android ✅
• App module's MergeComponentProcessor does NOT find contributions for iOS ❌
• Result: KotlinInjectAppComponentMerged is empty for iOS (doesn't extend the contribution interfaces)
Generated code comparison:
Android (works):

interface KotlinInjectAppComponentMerged : 
    ComDangerfieldAnteFeaturesActivityImplActivityFeatureEntryPoint,
    ComDangerfieldAnteFeaturesHomeImplHomeFeatureEntryPoint

iOS (broken):

interface KotlinInjectAppComponentMerged  // Empty!

The contribution interfaces ARE generated in the feature modules for iOS, but Resolver.getDeclarationsFromPackage("amazon.lastmile.inject") appears to not see them when processing the app module.

Is this a known limitation with Kotlin 2.2.x/KSP 2.2.x, or is there a specific configuration needed for cross-module contributions in KMP? I noticed the sample uses Kotlin 2.1.21 - Maybe I should downgrade?

Thanks!

[blakelee]

Re: https://kotlinlang.slack.com/archives/C0255B8KX7W/p1763072221070349?thread_ts=1744894927.888399&cid=C0255B8KX7W

InjectableThing is missing a provider in this case because you marked it as multibinding. Set<InjectableThing> should resolve

[Elijah Dangerfield]

oh yeah oops. A bit of copy and paste error

[Elijah Dangerfield]

Updating this: We hopped on a call. Couldn't resolve this. Even without the multi bindings it seems the app module could not locate the feature modules generated code for iOS

[Andrew Steinmetz]

I think it might be a ksp issue, I think I ran into something similar and came across the suggestion of adding this to my gradle.properties to fix the issue of it not compiling on ios.

ksp.useKSP2=false

[blakelee]

We managed to figure it out. There’s a bug where if you don’t have a @ContributesTo in commonMain then ksp doesn’t generate the graph for iOS

[Andrew Steinmetz]

I'm assuming that bug has yet to be fixed? If so, what exactly is the work around?

[blakelee]

you can just make an interface like this in your commonMain

@ContributesTo(Appscope::class)
interface MyInterface

I think it’s as simple as that