Changelog

Analysis API. FIR

• KT-83467 Package-level JSpecify annotations are ignored when coming from jars or libraries
• KT-82846 AA: unresolved KtExpression.expressionType for the reference to the parameter with default value

Analysis API. Infrastructure

• KT-83173 Analysis API Tests: Library names with RC versions aren't sanitised

Analysis API. Surface

Performance Improvements

• KT-83694 Provide psi-based implementation of KaDeclarationSymbol#isExternal
• KT-70868 KaSymbol: support PSI-only visibility and modality for the case without compiler plugins

Fixes

• KT-83152 [Analysis API, KDoc] Make class name links on constructors point to the class
• KT-83695 Deprecate KaSymbolInformationProvider#{getter, setter}DeprecationStatus
• KT-82853 Add a convenience property for testing declarations for effective external-ness
• KT-83226 Support "Collection literals" in the Analysis API
• KT-83225 Support "@IntroduceAt" in the Analysis API
• KT-83222 Support "Improve use-site defaulting for annotations" in the Analysis API
• Rename KaSession context parameter from 's' in bridges to something nicer

Backend. Wasm

• KT-67461 Use new lowering phase creation API in Wasm backend
• KT-83664 Wasm: Colon and space are not sanitized in output file names
• KT-82309 K/Wasm: refactor _initialize function
• KT-65779 JsExport declaration name clash
• KT-83025 Wasm: Compose application is not loading

Compiler

New Features

• KT-55548 JSR-305: Overload resolution ambiguity: Platform Types vs Kotlin Types
• KT-74860 Support Unit coercion (incl. fun refs) in unused return value checker
• KT-83401 Collection literals: support different types of expected types for CL
• KT-80492 Checkers for operator of
• KT-82638 Collection literals: resolve to factory functions for standard library classes
• KT-82655 Bridges generated for non-fake overrides shall include annotations from target methods
• Enable reading/writing annotations in metadata on JVM by default

Performance Improvements

• KT-83036 Native: too many casts emitted with -Xgeneric-safe-casts=true
• KT-73687 Inefficient KtCommonFile#getFileAnnotationList

Fixes

• KT-83031 K2: unstable resolution of EnhancedNullability from type-use NotNull in presence of unused code
• KT-78443 Refactor session component initialization for multi-target compilation
• KT-82579 Update specificity rule for context parameters
• KT-83427 Arguments of plugin-generated annotations are serialized incorrectly
• KT-83395 Kotlin/Native 2.3.0 iOS release framework fails with Invalid LLVM module (PHI node type mismatch)
• KT-83538 OPERATOR_RENAMED_ON_IMPORT is not reported for 'provideDelegate' operator
• OPERATOR_RENAMED_ON_IMPORT is not reported for 'of' operator

Compose compiler

• b/458234821 Disable Compose K1 tests on CI
• b/456948687 Force resolution of declarations when looking up SAM functions in FIR
• b/445426829 Add a diagnostic for key call with no arguments

IR. Inlining

• KT-80814 [IR Inliner] Space: jsBrowserProductionWebpack task failed with HookWebpackError
• KT-83280 Split LibrarySpecialCompatibilityChecksTest into pure JS and pure Wasm tests
• KT-79899 [IR Inliner] Split single-module tests having inline fun into files
• KT-83148 KLIB inliner: Make both "inliner" language features to require Api Version = 2.3

IR. Interpreter

• KT-82161 Enable Enum.name and KCallable.name to constant evaluation

IR. Tree

• KT-82765 Kotlin/Native: Internal compiler error when building DFG
• KT-83236 PeopleInSpace_mpp compilation error: The symbol table has been sealed
• KT-81154 [IrValidator] Fine-tune IrVisibilityChecker on 2nd stage

JVM. Reflection

• KT-83361 "KotlinReflectionInternalError: Type parameter not found: 0" on super types with Kotlin 2.3.0
• KT-83608 Kotlin-reflect: "Unknown origin of public abstract operator fun invoke(p1: P1, p2: P2): R"
• KT-42199 "KotlinReflectionInternalError: Unknown origin of public abstract operator fun invoke" on function reference to FunctionN.invoke
• KT-83067 Reflection: IAE "argument type mismatch" on callBy with vararg of generic type parameter with primitive upper bound

JavaScript

New Features

• KT-83455 K/JS: Support ES6 default function arguments in js() calls
• KT-83454 K/JS: Support ES6 classes in js() calls
• KT-83453 K/JS: Support ES6 concise methods in js() calls
• KT-83457 K/JS: Support ES6 spread operators in js() calls
• KT-83456 K/JS: Support ES6 rest function parameters in js() calls
• KT-82128 [K/JS] Allow named companion objects in exported interfaces

Fixes

• KT-65802 How to implement Interfaces in Javascript/Typescript?
• KT-83830 Relocate org.antlr.v4 to an internal package
• KT-70986 Add Swc into the compilation pipeline of Kotlin/JS
• KT-60554 KJS: rethink JS_*_NAME_CLASH diagnostics
• KT-83528 K/JS: Array holes in array literals are ignored in the new js() parser
• KT-82552 KJS: "Non-abstract class does not implement inherited abstract member from class" errors in generated .d.ts
• KJS: 'Reflection is not supported on JavaScript target, so you won't be able to read this annotation in runtime' warning is inconvenient and misleading

Klibs

• KT-82736 False positive IR_PRIVATE_CALLABLE_REFERENCED_BY_NON_PRIVATE_INLINE_FUNCTION_ERROR on referenece to local declaration
• KT-82586 Export in previous version (JS, Wasm): adjust the checker for incompatible Kotlin stdlib/compiler pairs
• KT-82758 [PL] Change the behavior of getting name of removed property
• KT-81470 Simplify inline function deserialization after the bootstrap update
• KT-83328 kotlin-wasm-benchmarks: Compilation errors due to missing KLIB dependencies
• KT-81957 [JS] Create a common Gradle test task

Language Design

• KT-83009 Exposing of non-exportable API from interfaces

Libraries

• KT-80666 K/N and K/Wasm: Regex: unassigned category is excluded from other chars
• KT-80665 K/N and K/Wasm: Regex: unicode category Symbol matches some punctuation marks
• KT-78089 K/N: Regex: Quantified groups matching is causing a stack overflow
• KT-82783 HashMap (K/N, Wasm), MapBuilder (all targets) duplicate keys
• KT-80786 Annotate kotlin-stdlib-jdk7/8 with @IgnorableReturnValue
• KT-83181 Remove @IgnorableReturnValue from contract DSL functions
• Remove unnecessary ExperimentalTime annotation from Uuid functions

Native. ObjC Export

• KT-82160 K/N: bridge for fake override is not built but requested

Native. Runtime. Memory

• KT-83470 Potential race condition in TryRequestThreadsSuspension due to initialization order
• KT-83549 Provide an experimental Platform property which returns information about object allocation mode
• KT-83535 Typo in out-of-memory error message

Native. Swift Export

• KT-82054 Swift Export: private set is ignored by swift export
• KT-83499 Swift Export: trampoulines w/ varargs results in a broken swift code
• KT-83655 Typealias to a closure receiving a closure results in broken swift code
• KT-82053 Swift Export: Returning generic on top level function produces uncompilable code
• KT-83141 Swift Export: suspendable covariant functional type

Tools. BCV

• KT-83484 Create fat-jar artifact for abi-tools [ABI Validation]

Tools. Build Tools API

• KT-82702 BTA: Allow collecting compiler lookups in non-incremental mode
• KT-78198 BTA: implement basic metrics collection
• KT-81790 [BTA] Make build operations and configuration immutable after execute
• KT-81729 BTA: loading from a classloader without implementation fails with CNFE instead of error with explanation
• KT-82399 [BTA] JvmClasspathSnapshottingOperationImpl doesn't use Option defaults

Tools. CLI

• KT-83202 Report all errors during parsing CLI arguments instead of a single one
• KT-83044 Report redundant CLI arguments when they have no effect

Tools. Compiler Plugin API

• KT-83823 Deprecate PreprocessedVirtualFileFactoryExtension

Tools. Compiler Plugins

New Features

• KT-28594 Add a 'jpa' pre-defined flavor to the allOpen compiler plugin.

Fixes

• KT-83334 Lombok. Builder function is unavailable for a generic class
• KT-83217 Lombok. With method is available for the static field
• KT-83120 Lombok. A constructor is available for a class with an existing constructor and @Data/@Value annotation
• KT-83119 Lombok. canEqual is not available from kotlin for a class with @Data annotation
• KT-83256 Lombok. Setter is available for non-final fields if @Value and @Data/@Setter are used together
• Lombok. Constructor from includes fields that are initialized in declaration

Tools. Gradle

New Features

• KT-79389 Add allopen plugin + JPA preset to kotlin.plugin.jpa

Fixes

• KT-82885 Run tests against Gradle 9.3.0
• KT-83323 Run integration tests against Gradle 9.2
• KT-82884 Compile against Gradle API 9.3.0
• KT-78763 Compatibility with Gradle 9.1.0 release
• KT-78754 KGP: Remove usages of isVisible/setVisible
• KT-80356 Compatibility with Gradle 9.2.0 release
• Deprecate CleanableStore infrastructure

Tools. Gradle. BCV

• KT-80614 Add dependency on abi check from gradle's check task [ABI Validation]

Tools. Gradle. JS

• KT-82946 Js, Wasm: Upgrade NPM dependencies

Tools. Gradle. Multiplatform

• KT-83687 Revert deprecation of 'androidTarget' for AGP lower than 9
• KT-77258 Query status of cross-compilation or compilation task
• KT-81973 NPE with Cannot invoke "java.util.List.get(int)" because "path" is null in KMP + Android project

Tools. Gradle. Native

• KT-83598 KotlinNativeDownloadTask build caching is unsafe

Tools. Maven

• KT-79304 Maven: Automatically add kotlin-stdlib dependency
• KT-83111 Add JavaVersion argument resolver for kotlin-maven-plugin-test
• KT-83112 Add MavenVersion argument resolver for kotlin-maven-plugin-test
• KT-83565 Maven: auto‑detect src/main|test/kotlin

Tools. REPL

• KT-82741 [K2 Repl] OOM in FirJavaElementFinderKt.collectAllDependentSourceSessionsTo when rerunning the same cell multiple times

Tools. Statistics (FUS)

• KT-82877 Add performance measurement for KLIB size