Kotlin is a statically typed programming language that runs on the Java virtual machine »Kotlin is a statically typed programming language that runs on the Java virtual machine and also can be compiled to JavaScript source code or use the LLVM compiler infrastructure. Its primary development is from a team of JetBrains programmers based in Saint Petersburg, Russia.
Kotlin for WebAssembly Goes Alpha 
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Kotlin Multiplatform Development Roadmap for 2024 