Kotlin Multiplatform v2.0.0-Beta1 Release Notes & Developer Guide

Kotlin 2.0.0-Beta1 delivers substantial K2 compiler maturity with 40+ Analysis API performance optimizations and 100+ critical bug fixes addressing IDE stability, type inference, and resolution accuracy. New language features include enum entries without parentheses and improved smart casting, while Kotlin/Wasm advances to final opcodes for better WebAssembly interoperability.

Highlights

• K2 compiler Analysis API gains 40+ performance optimizations and critical stability fixes
• Enum entries now work without parentheses for cleaner syntax
• Smart cast improvements for invisible setters and property delegates
• Kotlin/Wasm backend updated to final opcodes for GC and FTR proposals
• Fixed 100+ IDE K2 false positives and resolution errors
• Improved type inference for functional expressions and delegate properties