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kotlinlang

I want to migrate a `build.gradle` script from groovy to kotlin. Inside one of my build, I have this:
```allprojects {
    ext.runProtoGen = { inPath, outPath, kotlinPackage = null, logLevel = null, inSubPath = null -&gt;
      [...]
    }
}```
 How would I be able to do that with kotlin DSL ? Thanks :slightly_smiling_face:

Should be something like this:
```allprojects { subProject -&gt;
    subProject.ext["runProtoGen"] = { ... }
}```


Thanks! And then, how would I use it inside a subproject?

`val runProtoGen = project.ext["runProtoGen"] as (Some, Some) -&gt; Some`

There is also `by extra` delegate, probably could be used as well