Hey everyone, I’m trying to create a Gradle Convention Plugin for Kotlin Multiplatform but getting t...

# multiplatform

[Vaibhav Jaiswal]

Hey everyone, I’m trying to create a Gradle Convention Plugin for Kotlin Multiplatform
but getting this error on CocoapodsExtension

Extension of type 'CocoapodsExtension' does not exist. Currently registered extension types: [ExtraPropertiesExtension, LibrariesForAndroidLibs, LibrariesForLibs, VersionCatalogsExtension, KotlinMultiplatformExtension, KotlinTestsRegistry, BasePluginExtension, DefaultArtifactPublicationSet, SourceSetContainer, ReportingExtension, JavaToolchainService, JavaPluginExtension, KotlinArtifactsExtensionImpl, LibraryExtension, LibraryAndroidComponentsExtension, NamedDomainObjectContainer<BaseVariantOutput>]

This is my plugin

class KotlinMultiplatformPlugin: Plugin<Project> {

    override fun apply(target: Project):Unit = with(target){
        with(pluginManager){
            apply(libs.findPlugin("kotlinMultiplatform").get().get().pluginId)
            apply(libs.findPlugin("kotlinCocoapods").get().get().pluginId)
            apply(libs.findPlugin("androidLibrary").get().get().pluginId)
            apply(libs.findPlugin("kotlin.serialization").get().get().pluginId)
        }

        extensions.configure<CocoapodsExtension> {
            configureKotlinCocoapods(this)
        }

        extensions.configure<KotlinMultiplatformExtension>(::configureKotlinMultiplatform)
        extensions.configure<LibraryExtension>(::configureKotlinAndroid)
    }
}

[Vaibhav Jaiswal]

Have also tried to access it inside KotlinMultiplatformExtension but cannot access cocoapods {}

[MR3Y]

This error means that cocoapods plugin isn't on your classpath.
Make sure to add it in the root build.gradle.kts file:

plugins {
    alias(libs.plugins.kotlinCocoapods).apply(false)
}

Then in your convention plugin you'll be able to apply it and access CocoapodsExtension normally.

[Vaibhav Jaiswal]

@MR3Y I already have this in my project build.gradle.kts

[MR3Y]

Are you also adding it as a dependency in your convention plugin's build.gradle.kts ? like this:

dependencies {
    compileOnly(libs.cocoapods)
}

[MR3Y]

Note that the dependency coordinates for the gradle plugin here is different from what you add in the root build.gradle.kts

[Vaibhav Jaiswal]

@MR3Y haven’t tried this
What’s the artifact coordinate?

[MR3Y]

I mean the dependency coordinates (e.g "groupIdartifactversion"), for example you declare android applicaton gradle plugin like this to use it in your project's build script files:

androidApplication = "com.android.application:8.2.0"

but to use it in your convention plugin's build.gradle.kts as a dependency in dependencies block, you have to declare it like:

android-gradlePlugin = "com.android.tools.build:gradle:8.2.0"

[Vaibhav Jaiswal]

Whats the same for cocoapods
Tried this

org.jetbrains.kotlin:kotlin-native-cocoapods-gradle-plugin

Says cannot resolve

[Vaibhav Jaiswal]

https://plugins.gradle.org/plugin/org.jetbrains.kotlin.native.cocoapods

This shows the same which Ive already applied for KMP

[MR3Y]

I'm not familiar with cocoapods plugin, but you have to find the maven coordinates for it. like any other normal library dependency.

[MR3Y]

Try this:
"org.jetbrains.kotlinkotlin gradle plugin2.0.0-Beta2"

[MR3Y]

Substitute the version with yours

[Vaibhav Jaiswal]

already have this applied

compileOnly(libs.kotlin.gradlePlugin)

[MR3Y]

Found this:
https://mvnrepository.com/artifact/org.jetbrains.kotlin.native.cocoapods/org.jetbrains.kotlin.native.cocoapods.gradle.plugin

[Vaibhav Jaiswal]

Trying this

[Vaibhav Jaiswal]

@MR3Y still the same error

[MR3Y]

what are the coordinates you've used? for cocoapod?

[Vaibhav Jaiswal]

kotlin-cocoapods-gradlePlugin = { group = "org.jetbrains.kotlin.native.cocoapods", name = "org.jetbrains.kotlin.native.cocoapods.gradle.plugin", version.ref = "kotlin" }

[MR3Y]

what if you changed the group to "org.jetbrains.kotlin" ?

[Vaibhav Jaiswal]

Then i get

Could not find org.jetbrains.kotlin:org.jetbrains.kotlin.native.cocoapods.gradle.plugin:1.9.20.

[Vaibhav Jaiswal]

same for

Could not find org.jetbrains.kotlin:native.cocoapods.gradle.plugin:1.9.20.

[MR3Y]

and what error you were getting previously? can't resolve?

[Vaibhav Jaiswal]

Extension of type 'CocoapodsExtension' does not exist. Currently registered extension types: [ExtraPropertiesExtension, LibrariesForAndroidLibs, LibrariesForLibs, VersionCatalogsExtension, KotlinMultiplatformExtension, KotlinTestsRegistry, BasePluginExtension, DefaultArtifactPublicationSet, SourceSetContainer, ReportingExtension, JavaToolchainService, JavaPluginExtension, KotlinArtifactsExtensionImpl, LibraryExtension, LibraryAndroidComponentsExtension, NamedDomainObjectContainer<BaseVariantOutput>]

[MR3Y]

So, it successfully resolves the dependency

[Vaibhav Jaiswal]

yes

[Vaibhav Jaiswal]

it was resolved even before adding the dependency of gradle plugin

[Vaibhav Jaiswal]

This is the signature of cocoapods {}

public fun KotlinMultiplatformExtension.cocoapods(
    configure: Action<CocoapodsExtension>
): Unit

org.gradle.kotlin.dsl   Accessors2zy97bxtvt3cbfkizav1r0rybKt.class

[Vaibhav Jaiswal]

I cant even access it inside KotlinMultiplatformExtension

[Vaibhav Jaiswal]

Has anybody ever tried this? Cocoapods config in Gradle Convention Plugin?

[Bradleycorn]

@Vaibhav Jaiswal did you ever figure this out? I am running into the same problem.

[Vaibhav Jaiswal]

Yes, i figured it out
I have covered it in my blog