Kotlin Toolchain 0.12: Multiplatform Library Publishing, Wasm Apps, and More - The JetBrains Blog

Kotlin Toolchain 0.12.0 expands its alpha-stage multiplatform development capabilities with publication support for libraries targeting JVM, Android, iOS, and Wasm, including platform artifacts, metadata, sources, and C interop bindings. The release introduces preview support for building and running Wasm web applications, improves Compose Hot Reload through command-line controls and an MCP server for agent interaction, and reduces default Maven Central publication files to better meet anticipated quota limits. IDE enhancements in IntelliJ IDEA 2026.2.1 include Compose previews, improved resource handling, Android tooling features, more configurable iOS run settings, Kotlin/Swift interoperability fixes, and dependency-coordinate hints. Other changes include a project-root-relative local dependency syntax using `//`, a minimum requirement of JDK 17 and Kotlin 2.2.20, updated default framework versions, and production adoption of the toolchain by klibs.io.

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