v2.2.20-Beta1 Developer Guide

Kotlin 2.2.20-Beta1 delivers significant Analysis API stability improvements addressing red code issues in K2 IDE, enhanced contract support for operators and extension properties, and substantial Wasm backend optimizations. The release introduces KMP parser components and data-flow based exhaustiveness analysis while removing legacy internal APIs from Native and Wasm standard libraries.

Highlights

• Contracts now supported for operator functions and top-level extension properties
• Data-flow based exhaustiveness analysis for when expressions over sealed classes
• Wasm backend optimizations for function references and lambda virtual calls
• Analysis API improvements fixing red code issues in K2 IDE mode
• KMP Kotlin parser implementation with lexer and KDoc support
• Context parameters now resolved in KDoc and debugger visibility improved