override fun transform(outputs: TransformOutputs) {
        val inputFile = inputArtifact.get().asFile
        println("Transforming ${inputFile.name}...")
        outputs.file("${inputFile.nameWithoutExtension}-summary.txt").run {
            writeText("${inputFile.name}: ${inputFile.length()}")
        }
    }
}

import org.gradle.api.provider.ProviderFactory
import org.gradle.api.services.internal.BuildServiceProvider
import org.gradle.api.tasks.Input
import org.gradle.api.tasks.InputDirectory
import org.gradle.api.tasks.InputFile
import org.gradle.api.tasks.InputFiles
import org.gradle.api.tasks.Internal
import org.gradle.api.tasks.LocalState
import org.gradle.api.tasks.Nested
import org.gradle.api.tasks.Optional
import org.gradle.api.tasks.OutputDirectories

Here are some examples of the different types of arguments that the `source` property can take:

====
include::sample[dir="snippets/files/inputFiles/kotlin",files="build.gradle.kts[tags=set-input-files]"]
include::sample[dir="snippets/files/inputFiles/groovy",files="build.gradle[tags=set-input-files]"]
====

One other thing to note is that properties like `source` have corresponding methods in core Gradle tasks.

====
[.multi-language-sample]
=====
.build.gradle.kts
[source,kotlin]
----
tasks {
    myTask {
        inputFiles.from(configurations.classpath.incoming.artifactView {
            attributes {
                // Add attributes to select a different type of artifact
            }
        }.files)
    }
}