Kotlin v2.2.21-RC released!

NewsBot · 7 October 2025 12:23

Kotlin v2.2.21-RC has been released.

Changelog

Backend. Wasm

KT-81372 K/Wasm: JsException: Exception was thrown while running JavaScript code on Safari 18.2/18.3

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

Compiler

KT-81191 K2: “null cannot be cast to non-null type ConeTypeParameterLookupTag” with invalid code

KT-80936 NON_PUBLIC_CALL_FROM_PUBLIC_INLINE : @PublishedApi doesn’t work for fun interfaces

JavaScript

KT-80873 KJS: Stdlib requires ES2020-compatible JS engine due to BigInt type literal

KT-79926 Wrong export of interfaces with companions with ES Modules

Native

KT-79384 K/N: Application Not Responding: Thread Deadlock

Tools. Gradle

KT-81148 Publishing helpers in KGP are incompatible with Isolated Projects

KT-80950 KGP breaks configuration cache when signing plugin with GnuPG is applied

KT-79047 Gradle compileKotlin fails with configuration cache

Tools. Gradle. Multiplatform

KT-81249 Kotlin 2.2.20 broke KMP implementation of Parcelize

KT-61127 Remove scoped resolvable and intransitive DependenciesMetadata configurations used in the pre-IdeMultiplatformImport IDE import

Tools. Gradle. Native

KT-77732 commonizeCInterop failed with “Unresolved classifier: platform/posix/size_t”

[`KT-80675…

Link: Release Kotlin 2.2.21-RC · JetBrains/kotlin · GitHub