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I wonder whether that is maybe a KTIJ or KT bug. As far as I can see the switch from Kotlin to Java is at

gradle-8.2.1/subprojects/kotlin-dsl/src/main/kotlin/org/gradle/kotlin/dsl/NamedDomainObjectContainerExtensions.kt:329

where

container.create(...)

is called which returns

Configuration

. The package where this method is in is annotated with

org.gradle.api.NonNullApi

which is meta-annotated with

org.jetbrains.annotations.NotNull

and

javax.annotation.Nonnull

. So I wonder whether not KT(IJ) should handle it as

Configuration

instead of

Configuration!

.

Yep… IntelliJ is still warning if I call it directly:

val direct = configurations.create("direct")

Still leaves direct as

Configuration!

I've noticed this problem too, it's annoying. Might it be a problem with the property delegation getValue() function? Using

T & Any

as the return type in this workaround resolves the warning for me:

import org.gradle.kotlin.dsl.getValue as getValueOriginal

operator fun <T> ExistingDomainObjectDelegate<out T>.getValue(receiver: Any?, property: KProperty<*>): T & Any =
    getValueOriginal(receiver, property) as (T & Any)

val x by configurations.creating {  } // no warning

Yep… IntelliJ is still warning if I call it directly:

Copy code

val direct = configurations.create("direct")

Still leaves direct as

Configuration!

Well, it is not so sure what it thinks, here:

Kind of related issue which is fixed in 1.9.0 Kotlin

I reopened https://github.com/gradle/gradle/issues/9242 as it still happens