FYI. It’s possible to use Kotlin within moneydance extensions (mxt files). The code can be all Java, all Kotlin, or mixed Java/Kotlin.

The Kotlin target must be Java/JVM bytecode.

The moneydance_open repo on GitHub has been recently updated; so if you fork that and look at the ant build.xml file you will see how it’s enabled.

Essentially for ant:
- you must first have the Kotlin compiler installed (either manually, or by having IntelliJ installed)

• to the build file you add:

  <typedef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="pathto/kotlin-ant.jar"/>
  

Then, within the <javac> task, you add:

<withKotlin/>

Don’t forget to update your includes statement to include the *.kt files too!

Your project must also have the Kotlin dependency. As soon as you add a Kotlin file, then IntelliJ should add this for you anyway.

The simple approach is probably to use the Kotlin tools to convert one class from Java to Kotlin and see how that works.

Refer: https://www.jetbrains.com/help/idea/get-started-with-kotlin.html