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I suppose you can use it as an output with `@OutputFiles`.

I thought that `@OutputFiles` only works with `List&lt;File&gt;` and not with that type

It works with maps as well: <https://docs.gradle.org/current/javadoc/org/gradle/api/tasks/OutputFiles.html>

I expect to use `Map&lt;String, List&lt;File&gt;&gt;`, not `Map&lt;String, File&gt;`

So I am getting `Expected file collection to contain exactly one file, however, it contains more than one file`

I did this as a workaround

```    @Internal
    val commonMainDrawablesGroupedBySuffix: Map&lt;String, List&lt;File&gt;&gt; =
        commonMainDrawablesGroupedBySuffix(commonMainResourcesDirs.toList(), suffixes.get())

    @OutputFiles
    val commonMainDrawables: List&lt;File&gt; = commonMainDrawablesGroupedBySuffix.values.flatten()```

it works, but the problem is `commonMainDrawables` is marked by the IDE as not used, which is technically true

You can use `@Nested` for outputs, though you’d need to define your own type. Something like should work:
```class MyOutput {
    @OutputFiles
    List&lt;File&gt; outputs
}

@Nested
val drawables: Map&lt;String, MyOutput&gt;```


I had a different issue, sorry, with the new implementation even I don't need that output anymore, thank you for your help and I note the trick for the next one! :)