Hi all - i have a kotlin multiplatform project with multiple modules ```// module-1 build.gradle.kts...

# gradle

[xxfast]

Hi all - i have a kotlin multiplatform project with multiple modules

// module-1 build.gradle.kts
plugin {
  kotlin("multiplatform")
}

// module-2 build.gradle.kts
plugin {
  kotlin("jvm")
}

// module-3 build.gradle.kts
plugin {
  kotlin("js")
}

how do I enable explicitApi mode for allprojects{} of the root build.gradle.pks ?

// root build.gradle.kts
allprojects {
  extensions.configure<KotlinMultiplatformExtension> { explicitApi() } // Extension of type 'KotlinMultiplatformExtension' does not exist. 
}

[tapchicoma]

replace KotlinMultiplatformExtension with org.jetbrains.kotlin.gradle.dsl.KotlinTopLevelExtensionConfig

[Vampire]

And more importantly, don't do it.
allprojects { ... } and subprojects { ... } are evil.
Better use convention plugins.
So for example have a my.common.conventions convention plugin that sets the explicitApi, and apply it to all three projects explicitly.
Or have additionally a plugin my.kmp.conventions, my.jvm.conventions, and my.js.conventions that each apply my.common.conventions and the respective Kotlin plugin, then apply those to your projects.