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Error is

Type mismatch: inferred type is T? but T was expected

In a build script or in a plugin? It’s fine in Intellij in build.gradle.kts but not in a plugin class.

both, works fine for me in a includeBuild plugin

does your include build use kotlin-dsl?

yes

That might be why?

ah yes, Kotlin intentionally changed behavior https://youtrack.jetbrains.com/issue/KT-48623/Type-nullability-enhancement-improvements and

kotlin-dsl

uses the flag to disable it

I don’t follow, does that mean this is a bug in kotlin? Is the Transformer api correctly typed, and using k2 is an ok workaround, or should I expect this to break in the future under k2 as well?

there is a package-level

@NonNullApi

in Gradle: https://github.com/gradle/gradle/blob/master/subprojects/core-api/src/main/java/org/gradle/api/package-info.java thus the Transform API is not actually correct

I’ll write up an issue with a reproducer to at least get it logged.