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Copying here from the Kotlin slack for readers here. You shouldn't, but instead add an extension to the handler where you want to have that. If you for example have in the plugin

abstract class Foo {
    fun bar() {
        println("bar")
    }
}
f
(repositories as ExtensionAware).extensions.create<Foo>("foo")

then you can do downstream for example:

repositories {
    foo.bar()
}

or

repositories {
    foo {
        bar()
    }
}

and in both, Groovy DSL and Kotlin DSL

@Vampire Is there a way to get typings on this?

What do you mean exactly? Do you mean type-hints / IntelliSense by IDE?

Thanks for the insightful reply! And I agree with you and wish that we could just use Kotlin DSL. But there are the skeptics who refuse to use it /shrug I am already using IntelliJ Ultimate and not getting completions for it, but maybe I just shouldn't care and tell the Kotlin skeptics to adopt or die:)

I am already using IntelliJ Ultimate and not getting completions for it

Yes, what I said. You will not get completions which is why Kotlin DSL is so much better. You can research about GDSL files and whether they might maybe work. But honestly, the better invest would be to make those sceptics die. 😄