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kotlinlang

Hello, I've got a problem that might fit in here. I wrote some software in Java (8), using Nashorn for JS support. I have Java functions that ran from JS using Java.type("the.java.class.name"). I've today converted this program to Kotlin completely and my final problem is this JS integration (yes, it's core functionality). So, my question: must I switch from Nashorn and use Kotlin's JS support (about which I know nothing) or is there an alternative that I couldn't find online?