how can I use

task.outputs.files.elements

to filter on a file type to get a

Provider<FileSystemLocation>

and set that as an

artifact

for an outgoing configuration? With the following, I get this error:

Querying the mapped value of flatmap(provider(task 'kspDebugUnitTestKotlin', class com.google.devtools.ksp.gradle.KspTaskJvm)) before task ':myProject:kspDebugUnitTestKotlin' has completed is not supported

fun File.isYamlFile(): Boolean {
    return this.name.endsWith(".yaml")
}

val myTask = tasks.named("kspDebugUnitTestKotlin")

fun TaskProvider<Task>.yamlProvider(): Provider<FileSystemLocation> {
    return flatMap { task ->
        task.outputs
            .files
            .elements
    }
        .map {
            it.single { fileSystemLocation ->
                fileSystemLocation.asFile.isYamlFile()
            }
        }
}

artifacts.add(
        "someConfiguration,
        myTask.yamlProvider()
)

It looks like

artifacts.add(..)

queries the value of the provider too soon?