The Daily Kotlin

Kotlin 2.1.0-Beta2

2.1.0-Beta2 (click to copy version to test it)

- @SubclassOptInRequired - to require opt-in from library clients when implementing interface/extending class
- Guard conditions in when with a subject
- Non-local break and continue
- Multidollar interpolation: improved handling of $ in string literals.
- New Gradle DSL for compiler options in multiplatform projects is stable
- Improved overload resolution for functions with generic types
- Improved K2 kapt implementation
- Update LLVM version to 16.0.0 for Kotlin/Native
- Kotlin/Wasm and Kotlin/JS improvments
- Extra compiler checks! (opt-in)
- Compose compiler updates

Kotlinlang.org: What's new in Kotlin 2.1.0-Beta2
GitHub Changelog

JetBrains Blog: Ktor 3.0 Is Now Available With New Features and Improved Performance

Kotlin 2.0.21 Released

Changelog

Ktor 3.0 Released

- Migration to kotlinx.io
- Client for Kotlin/Wasm
- SSE Client/Server

New plugins:
- The BOMRemover plugin allows you to remove Byte Order Mark (BOM) from the response body.
- The CallId client plugin allows you to trace client requests by using unique call IDs.

Migration Guide from 2.2.x to 3.0.x

Changelog Github
Changelog Ktor.io

The Evolution of the Kotlin Language and How You Can Contribute

Migrating Kotlin Plugins to K2 Mode

Koin 4.0 released

Koin 4.0 brings major updates with Kotlin 2.0.20 as a new baseline, focusing on Kotlin Multiplatform, Android, and Compose. Key improvements include true UUID generation across platforms, internal optimizations with better performance, a revamped ViewModel API now supporting multiplatform, and Compose lifecycle handling. The release also introduces the experimental “Koin-Fu” project to rethink the DSL and AndroidX Startup support for faster app loading. Deprecated APIs have been removed or replaced for a cleaner experience.

Just be aware of funky Koin defaults

Kotlin 2.1.0-Beta1

2.1.0-Beta1 (click to copy version to test it)

I didn’t find anything too exciting, so here is the change log:

https://github.com/JetBrains/kotlin/releases/tag/v2.1.0-Beta1

What’s new in Kotlin 2.1.0-Beta1

https://kotlinlang.org/docs/whatsnew-eap.html

Kotlin Roadmap September Update

I’m very existed to see this item implemented:

🆕 Library ecosystem: Introduce default warnings/errors for Kotlin functions that return non-unit values that are unused

https://www.youtube.com/watch?v=E8CtE7qTb-Q

1.5h documentary about Kotlin. Interviews with Kotlin team members

Command-line tool for creating Ktor projects written in… Go 😂️️️️️️

I know you folks love surveys, this one about Kotlin:

Kotlin Developer Survey #3

🤔 https://www.youtube.com/watch?v=55NL0vnjjJg

Kotlin 2.0.20 Released!

• Data class copy function now matches constructor visibility.
• Static accessors for multiplatform source sets are introduced.
• Concurrent marking in Kotlin/Native’s GC is now possible.
• The @ExperimentalWasmDsl annotation location changed.
• Gradle 8.6–8.8 supported.
• Option to share JVM artifacts between projects as class files
• Compose compiler update.
• UUID support in the common Kotlin standard library.

Details
GitHub Changelog

Kotlin 2.0.20-RC2 Released with a bunch of fixes, try now!

Context Receivers → Context Parameters migration plan:

Kotlin 2.0.20 – new warning in build introduced: CONTEXT_RECEIVERS_DEPRECATED, with -Werror we have to manually suppress it for each file
Kotlin 2.1.0 – Disable warning globally https://youtrack.jetbrains.com/issue/KT-8087 freeCompilerArgs.add("-Xsuppress-warning=CONTEXT_RECEIVERS_DEPRECATED”)
Kotlin 2.1.20 – Removing Context Receivers from compiler
Kotlin 2.2.0 – Context Parameters introduced behind flag https://youtrack.jetbrains.com/issue/KT-67119

Plan for people heavily using Context Receivers, and don’t want to refactor out them completely:

1. Stay on Kotlin 2.0.1x until 2.1.0 released
2. Migrate to 2.1.0 up to 2.1.1x
2. Migrate to 2.2.0

Kotlin 2.0.20-RC Released

The Kotlin 2.0.20-RC brings a range of new features, enhancements, and deprecations as Kotlin continues to evolve toward the full 2.0 release. Key updates include:

- Data Class Copy Function Visibility: The .copy() function in data classes will now have the same visibility as the constructor, with migration warnings introduced.
- Context Receivers: Gradual deprecation of context receivers, which will be replaced by context parameters in future releases.
- Kotlin Multiplatform: Static accessors for source sets are now available, improving IDE experience and usability.
- Kotlin/Native: Experimental support for concurrent marking in the garbage collector, aimed at reducing GC pause times.
- Kotlin/Wasm: Migration from default to named exports, with warnings now upgraded to errors.
- Compose Compiler: Various improvements, including the default enablement of strong skipping mode for better performance and stability.

GitHub Changelog
Kotlinlang.org: What's new in Kotlin 2.0.20-RC

Kotlin 2.0.10

https://github.com/JetBrains/kotlin/releases/tag/v2.0.10

KotlinConf 2025!

https://kotlinconf.com/registration/

See you there ;)

Kotlin turns 13 💪️️️️