Kotlin 2.2.20 has been released, bringing the popular programming language's WebAssembly compilation tool, Kotlin/Wasm, into beta. This release also delivers significant improvements to Kotlin Multiplatform, Kotlin/Native, and Kotlin/JS, reinforcing Kotlin's position as a leading choice for multiplatform development.
Kotlin 2.2.20 introduces beta support for WebAssembly compilation and enhances the multiplatform ecosystem.
Key Takeaways
- Kotlin/Wasm enters Beta: Compile Kotlin code to WebAssembly with improved JS interop, NPM dependency management, and browser debugging support.
- Kotlin Multiplatform enhancements: Swift export now available by default; stable cross-platform library compilation; simplified dependency declaration.
- Kotlin/Native improvements: Support for stack canaries and smaller release binaries for enhanced security and performance.
- Kotlin/JS update: Long values now compile to JavaScript BigInt for better numeric precision.
- Language preview: Try upcoming Kotlin 2.3.0 features including improved overload resolution with suspend functions and return statements in expression bodies.
- IDE Support: The Kotlin 2.2.20 plugin is bundled with the latest IntelliJ IDEA and Android Studio versions.
Kotlin/Wasm: WebAssembly Compilation Enters Beta
The headline feature of Kotlin 2.2.20 is the promotion of Kotlin/Wasm to beta status. This tool allows developers to compile Kotlin code directly to WebAssembly (Wasm), enabling high-performance execution in web browsers and other Wasm runtimes. While the core Kotlin language remains stable, JetBrains notes that components like Kotlin/Wasm may be in pre-stable stages (like beta) to gather valuable developer feedback while clearly marking their stability level.
"While core components such as the standard library are considered stable and production-ready, other components, such as Kotlin/Wasm, may still be in a pre-stable stage, such as beta. This is part of an approach to provide early access to features for feedback while clearly marking their stability level."
— JetBrains on Kotlin 2.2.20 Release
Kotlin/Wasm Beta Improvements
- Improved exception handling for JavaScript interoperability.
- Better management of NPM dependencies.
- Enhanced support for browser debugging.
- New shared source set for
jsandwasmJstargets.
Use Case: Kotlin in the Browser
- Run Kotlin code alongside JavaScript in web applications.
- Achieve near-native performance for compute-intensive tasks.
- Share code between server, client, and web frontend.
- Leverage existing Kotlin libraries in WebAssembly environments.
🚀 Kotlin Multiplatform: Major Enhancements
🍎 1. Swift Export Available by Default
The Swift export feature is now enabled by default, dramatically simplifying the process of using Kotlin code from Swift in iOS, macOS, watchOS, and tvOS applications. This removes friction for Apple ecosystem developers who want to share business logic across platforms.
📚 2. Stable Cross-Platform Library Compilation
Kotlin 2.2.20 provides stable cross-platform compilation for Kotlin libraries, making it production-ready for library authors who need to distribute their code across JVM, JS, Native, and Wasm targets simultaneously.
📦 3. Simplified Dependency Declaration
A new approach to declaring common dependencies lets developers declare dependencies directly inside the kotlin {} block using a top-level dependencies {} block. This feature works in projects using Gradle 8.8 or higher and reduces boilerplate in multiplatform builds.
⚙️ Compiler & Language Enhancements
🔮 Preview: Kotlin 2.3.0 Features
Developers can try upcoming language features planned for Kotlin 2.3.0:
- Improved overload resolution: Better handling when passing lambdas to overloads with
suspendfunction types. - Return statements in expression bodies: Support for
returnstatements in expression bodies with explicit return types.
🛡️ Kotlin/Native Enhancements
- Stack canaries: Added security protection against stack buffer overflow attacks.
- Smaller release binaries: Reduced binary size for production deployments.
- Improved performance for native target compilation.
📜 Kotlin/JS Update
- BigInt support: Kotlin
Longvalues now compile to JavaScriptBigInt, enabling precise handling of 64-bit integers in JavaScript environments. - This eliminates precision issues when working with large numbers in JS interop scenarios.
💻 IDE Support & Migration
The Kotlin plugin for Kotlin 2.2.20 is bundled in the latest version.
The latest versions include the Kotlin 2.2.20 plugin.
Migration Note: As with any Kotlin release, review the official migration guide for any breaking changes or deprecated APIs when upgrading from earlier versions.
⚠️ Important Note on Beta Features
- Kotlin/Wasm is in Beta: While suitable for experimentation and feedback, JetBrains recommends caution for production applications until the feature reaches full stability.
- Gradle Version Requirement: The new simplified dependency declaration requires Gradle 8.8 or higher.
- Preview Features: Kotlin 2.3.0 language features are preview-only in this release and may change before final stabilization.
💡 The Bottom Line
Kotlin 2.2.20 marks a significant milestone with Kotlin/Wasm entering beta, opening new possibilities for running Kotlin code in web browsers and WebAssembly runtimes. Combined with the default availability of Swift export for Kotlin Multiplatform and improvements across Kotlin/Native and Kotlin/JS, this release reinforces Kotlin's position as a leading multiplatform language. For teams building cross-platform applications, web frontends, or native binaries, upgrading to 2.2.20 provides immediate benefits while offering a preview of exciting features coming in Kotlin 2.3.0.
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