v1.7.20-Beta

Kotlin 1.7.20-Beta delivers significant stability improvements across the K2 compiler with 50+ critical bug fixes for type inference, Java interoperability, and inline functions. The release adds new standard library APIs for NIO file operations, enhances Kotlin/Native framework customization, and improves JavaScript IR code generation efficiency. Gradle tooling receives major updates including simplified JVM configuration and enhanced error diagnostics for better developer experience.

Highlights

• K2 compiler improvements with 50+ bug fixes for type inference, SAM interfaces, and generic types
• Kotlin/Native framework customization via bundle identifier configuration
• JavaScript IR performance improvements reducing unnecessary getter/setter calls and boilerplate
• New standard library functions for java.nio.file.Path operations and open-ended ranges
• Gradle plugin enhancements including simplified JVM toolchain configuration and better error reporting
• Improved IDE support with FIR analysis API fixes for generic types and import optimization