I'm having a problem converting gradle scripts to ...

# gradle

[estevanfick]

I'm having a problem converting gradle scripts to kotlin regarding of closure: I have this method signature in Groovy:
static copyAndRenameChildFiles(File sourceDir, Closure<String> filenameTransform)
and I'm trying to call from a kotlin script, I tried to use `closureOf`like this:
val copyDir = FileUtils.copyAndRenameChildFiles(svgSrcDir, closureOf<String> { this.replace("-", "_") })
but I'm getting the error:
Type mismatch: inferred type is Closure<Any?> but Closure<String!>! was expected
the original call on Groovy was:
File copyDir = FileUtils.copyAndRenameChildFiles(svgSrcDir, { String filename -> filename.replace("-", "_") })

[Sam]

The type parameter of Closure is its return type, whereas the type parameter of closureOf is the input type 😬. Try KotlinClosure1<String, String>({ this.replace("-", "_") }), which lets you specify both type parameters.

[Sam]

More info: https://docs.gradle.org/current/userguide/kotlin_dsl.html#groovy_closures_from_kotlin

[estevanfick]

it works, you are the best.... thanks

[Vampire]

Or if you can modify copyAndRenameChildFiles, use Transformer instead of Closure

[Vampire]

Then you do not need closure-tricks in Kotlin but can just use a closure from Groovy and a lambda from Kotlin