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Does anyone have a crash course how compilation vs source sets work in KGP? Can I add a dependency to a compilation? Without having to go through source sets?

I am also very interested in this from a multiplatform setting ofcourse

Yea, KMP is where it gets interesting. I've been monkey adding dependencies for years now but for the sake of me I cannot grasp the magic that ties it all together

`KotlinCompilation` and `KotlinSourceSet` have very blurred borders between each other.

Regarding your question:
• you could access main source set for give compilation via <https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-kotlin-compilation/default-source-set.html|KotlinCompilation.defaultSourceSet>
• `KotlinCompilation` currently also extends <https://kotlinlang.org/api/kotlin-gradle-plugin/kotlin-gradle-plugin-api/org.jetbrains.kotlin.gradle.plugin/-has-kotlin-dependencies/|HasKotlinDependencies> interface, but we are <https://youtrack.jetbrains.com/issue/KT-67290/Deprecate-usage-of-HasKotlinDependencies-inside-KotlinCompilation|deprecating> it in 2.3.0 release

So the default sourceSet is `jvmMain` for an example, right? It's the "leaf" source set, right?

yes, for JVM target `main` compilation it is `jvmMain`

(I'm trying to set `kotlin-stdlib` to a certain version on JVM compilations and another version on all the other ones, still chewing <https://kotlinlang.slack.com/archives/C19FD9681/p1755619037216649|that bone>)