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related, since this is Kotlin, I have to add `@Suppress("NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS")` to get my IDE to stop complaining about returning null from that `map`.

for Kotlin I’ve added this extension function:
```public inline fun &lt;reified S&gt; Provider&lt;S&gt;.filter(crossinline predicate: (S) -&gt; Boolean): Provider&lt;S&gt; {
    return flatMap {
        if (predicate(it)) {
            Providers.of(it)
        } else {
            Providers.notDefined()
        }
    }
}```

sidesteps the null check by doing what Gradle does internally when `null` is returned - use `Providers.notDefined()`.  The `flatMap` is there to unwrap the providers.

```baseline.set(extension.baseline.filter { it.asFile.exists() })```

<https://github.com/gradle/gradle/issues/2016>