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kotlinlang

Hi, I'm trying to add Dokka to a project using Groovy Gradle, and I tried to config the `outputDirectory` and `reportUndocumented` like so, following the instructions in the Dokka wiki, yet it seems to error out:
```tasks.named("dokkaHtml") {
    outputDirectory.set(buildDir.resolve("dokka"))
    dokkaSourceSets {
        reportUndocumented = true
    }
}```

There is no resolve on file in groovy. You can use resolve on paths and convert it back to file:
```outputDirectory.set(file(buildDir.toPath().resolve("output")))```