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("-", "_") })

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.

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

Or if you can modify

copyAndRenameChildFiles

, use

Transformer

instead of

Closure