What’s New in Kotlin 2.3.20? Name‑Based Destructuring and Cross‑Platform Enhancements

Kotlin 2.3.20, the latest release from JetBrains announced on March 16, expands the language’s cross‑platform capabilities by adding name‑based destructuring declarations, experimental C and Objective‑C interop for Kotlin Native, and enhanced Kotlin/JS support, while also improving Maven and Gradle integration.

Name‑Based Destructuring replaces the traditional position‑based componentN() functions. Variables are now matched to property names, making destructuring clearer and less error‑prone.

Interop Improvements :

Kotlin Native can import C and Objective‑C libraries for use in Kotlin Multiplatform (KMP) projects, though compatibility with older compiler versions may be limited.

Kotlin/JS now allows Kotlin interfaces to be implemented directly from TypeScript, removing the previous restriction that only exported Kotlin interfaces could be used.

The JavaScript/TypeScript compilation pipeline leverages the Rust‑based SWC compiler to transpile modern code to older, more compatible JavaScript versions.

Build Tool Enhancements :

Maven projects benefit from automatic detection of source roots and inclusion of the Kotlin standard library.

Gradle support is extended to versions 7.6.3 through 9.3.0, though using the newest Gradle may produce deprecation warnings and some features might not work as expected.

New compiler annotations such as @Nullable, @Unmodifiable, and @UnmodifiableView improve null‑safety and read‑only collection handling.

Additional Features :

An alpha‑stage Lombok compiler plugin is introduced, aiming for production‑ready annotation processing.

The extension function Map.Entry.copy() creates immutable copies of map entries, enabling safe modification via Map.entries.

For the full list of changes and detailed documentation, see the official Kotlin release notes at https://kotlinlang.org/docs/whatsnew2320.html.