JetBrains/kotlin v2.5.0-RC

Kotlin 2.5.0-RC

on GitHub

Changelog

Analysis API. Standalone

• KT-89902 Analysis API Standalone: JavaPsiFacade doesn't find Kotlin classes from binary libraries

Backend. Wasm

• KT-91167 K/Wasm: suspend lambda containing a suspend call triggers unrelated file-property initialization

Compiler

• KT-90315 Value classes resolved first as a supertype are treated as identity classes
• KT-84904 Alpha release of Multi-Field Value Classes
• KT-90707 Parser: "Expecting ';' after the last enum entry" when an enum entry named error has arguments or a body
• KT-91112 Type inference: reified Enum inferred as Nothing for a function-reference extension call since Kotlin 2.5
• KT-90589 K/N: Debug static framework with a Kotlin subclass of NSObject does not link without -dead_strip: undefined "_kfun:platform.darwin.NSObject#objc:*-impl"
• KT-90321 K2 IDE: "Multiple plugins generated nested class with same name Companion" floods the IDE log for a class with @Slf4j (Lombok) and @Serializable
• KT-89985 InnerClasses entries lack ACC_IDENTITY with -Xjvm-enable-preview on JVM target 28

IR. Inlining

• KT-72464 [Native][JS][Wasm] Non-local return through suspend conversion breaks the IR inliner

JVM. Reflection

• KT-91317 Reflection: IAE "fromIndex(1) > toIndex(0)" on KClass.members of stdlib inline classes
• KT-90525 Reflection: "MutableCollectionKClassImpl cannot be cast to ClassBasedDeclarationContainer" from KType.classifier of annotated Java collection type

JavaScript

• KT-91371 K/JS: extending a JsExport-ed interface breaks property access
• KT-90564 K/JS, K/Wasm: top-level suspend function doesn't trigger file properties initialization
• KT-90587 K/JS: Exported abstract suspend functions are not callable from JS
• KT-90912 K/JS: IR-based TypeScript export loses abstract modifier on abstract suspend method with a default argument

Klibs

• KT-91139 [Klib] Backward compatibility break: Kotlin 2.4.20+ miscompiles suspend conversions from KLIBs built by Kotlin ≤ 2.2
• KT-90675 Native, Klibs: Value class '==' boxes because the deserializer doesn't recognize the old GENERATED_SINGLE_FIELD_VALUE_CLASS_MEMBER origin

Libraries

• KT-91066 Kotlin/Wasm: KClass.hashCode() allocates and hashes the qualified class name string on every call

Tools. Compiler Plugins

• KT-90516 Lombok: Unexpected returnTypeRef during supertype generation for builder class
• KT-90666 Lombok: disable @Builder annotation in Kotlin code due to many issues
• KT-90086 Lombok: ClassCastException during supertype generation for EqualsAndHashCode with inheritance

Tools. Compiler plugins. Compose

• KT-84055 Reference to lambda in lambda in function 'TextField' can not be evaluated
• KT-90466 Compose compiler, Kotlin/Native: IrLinkageError "No function found for symbol" for lambda SAM-converted to @Composable fun interface from another module

Tools. Compiler plugins. Serialization

• KT-91224 Kx Serialization: Regression in support of Java enums with Serializable annotation

Tools. Gradle

• KT-91331 Deprecated Kotlin sourceSets in Android extension: block form doesn't report the error in Groovy DSL or in suppressed Kotlin DSL
• KT-91330 Groovy DSL: kotlin { sourceSets { main {} } } in Android project fails with misleading "Could not find method main()"
• KT-85935 KGP / Android: sourceSets deprecation not shown in DSL block form inside KotlinAndroidProjectExtension
• KT-90672 Gradle: "configureEach(Action) on task set cannot be executed in the current context" when KotlinCompile is created lazily with AGP built-in Kotlin
• KT-90997 Preserve behaviour of deprecated kotlin.internal.incremental.enableUnsafeOptimizationsForMultiplatform in 2.5.0

Tools. Gradle. JS

• KT-90489 Rich TypeScript declarations ignore Long-as-BigInt enabled by target es2020
• KT-90491 GenerateTypeScriptDefinitions task generates UMD declarations for ES module when target is es2015 or higher and module kind is not set
• KT-90533 -Xes-long-as-bigint=true is ignored by Analysis API-based TypeScript declaration generation
• KT-90519 KGP and BTA do not preserve -XXLanguage settings for Analysis API-based TypeScript declaration generation
• KT-90366 -Xdts-use-unknown-instead-any is ignored by the new GenerateTypeScriptDefinitions task
• KT-89797 KJS/KGP: Playwright tests fail to update after kotlin code changes
• KT-90286 NodeJsExec ignores a custom executable

Tools. Gradle. Multiplatform

• KT-90544 Gradle, Multiplatform: Publication iteration misses JS, Wasm and Native targets since 2.5.0-Beta2 (after Kotlin Archive publishing changes)

Tools. Gradle. Swift Export

• KT-90738 swiftPackageIntegration: Release build fails to link exported package (undefined symbol KotlinRuntimeSupport_linkAnchor)

Tools. Incremental Compile

• KT-91153 Incremental compilation failed: The following FqNames can't be derived from DirtyData.dirtyLookupSymbols