Kotlin Multiplatform v2.5.0-RC Release Notes & Developer Guide

Kotlin 2.5.0-RC introduces an alpha release of Multi-Field Value Classes and delivers numerous fixes across Kotlin/JS, Kotlin/Native, and the IR inliner. The release also stabilizes the Lombok and Compose compiler plugins, resolves Gradle multiplatform publication and Swift Export linking issues, and restores backward compatibility for KLIB suspend conversions.

Highlights

• Alpha release of Multi-Field Value Classes introduces support for value classes with multiple fields
• Multiple fixes for Kotlin/JS suspend functions, exports, and TypeScript declaration generation
• Improved Lombok compiler plugin stability, including disabling the problematic @Builder annotation
• Fixes for Compose compiler issues with lambda evaluation and Kotlin/Native SAM conversions
• Backward compatibility fix for suspend conversions in KLIBs built by Kotlin 2.2 and earlier
• Gradle improvements for Kotlin Multiplatform publication and Swift Export linking