Kotlin Multiplatform v2.0.0-Beta4 Release Notes & Developer Guide

Kotlin v2.0.0-Beta4 delivers critical performance improvements, particularly a 50GB memory allocation fix, alongside extensive compiler stability enhancements across K2, builder inference, and multiplatform support. Major additions include multi-threaded analysis resolution, TypeScript definition generation for Wasm, and platform-specific declaration clash diagnostics. The release resolves numerous type inference inconsistencies and IDE integration issues while strengthening Kotlin/Native and Kotlin/Wasm capabilities.

Highlights

• 50GB memory allocation fix for kotlinx.collections.immutable.persistentMapOf creation
• Multi-threaded and parallel resolve implementation for LL FIR analysis
• Extensive builder inference fixes resolving type inference inconsistencies
• Platform-specific declaration clash diagnostics across all backends
• TypeScript definitions generation for @JsExport declarations in K/Wasm
• Kotlin/Wasm lazy associated object initialization and singleton lambda support