Kotlin v2.2.20-RC released!

NewsBot · 19 August 2025 12:23

Kotlin v2.2.20-RC has been released.

Changelog

Backend. Wasm

KT-80018 K/Wasm: exceptions don’t work properly in JavaScriptCore (vm inside Safari, WebKit)

Compiler

KT-79979 K2: ClassCastException when overriding extension property with delegation

KT-79866 kotlinc 2.2.0 silently emits ‘NonExistentClass’ instead of reporting an error

KT-79276 Dexing fails with “Cannot read field X because is null” with 2.2.0

KT-79781 Missing MISSING_DEPENDENCY_CLASS when using type alias with inaccessible RHS

KT-79547 “UnsupportedOperationException: Not supported” with inlining and value classes

KT-79519 Nested type alias is unreachable from another module

Compose compiler

b/432262806 Fix target description lookup

b/436870733 Prevent lambda memoization in local classes inside a composable

b/432485982 Fix AbstractMethodError when overriding function with default parameters

JavaScript

KT-79916 K/JS: “Uncaught TypeError” when using ‘Xes-long-as-bigint’ in compose-html

KT-79977 KJS: Long.rotateLeft returns incorrect result when BigInts are enabled

KT-79644 BigInt enabled for ES 2015 despite being an ES 2020 feature

KT-79089 KJS: Could not load reporter / Cannot find module ‘mocha’ when running jsNode tests

Native

…

Link: Release Kotlin 2.2.20-RC · JetBrains/kotlin · GitHub