Kotlin 2.3.0 Released

Kotlin 2.3.0 just dropped with some serious multiplatform firepower. If you're building cross-platform apps, this release fundamentally changes how you work with Swift, Wasm, and native code.

JetBrains released Kotlin 2.3.0 with major updates across all platforms. The release focuses on stabilizing experimental features, improving interop capabilities, and boosting build performance. This is particularly significant for teams working on Kotlin Multiplatform projects targeting iOS, Android, and web.

Key Takeaways

• Swift export improvements enable better iOS interop for Kotlin Native
• Wasm gets compact Latin-1 storage and new exception handling by default
• Gradle 9.0 compatibility with new API for registering generated sources
• Compose compiler now provides stack traces for minified Android apps
• Java 25 support and faster release build times for Native

The unused return value checker and explicit backing fields could change how you write Kotlin code, but they're buried in the language updates section.