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
• KT-83351 Rename KaSession context parameter from 's' in bridges to something nicer
• KT-83199 Clarify API around extension points
• KT-83074 Inner enum entry class has incorrect default visibility
• KT-82442 Add Ka prefix to org.jetbrains.kotlin.analysis.api.symbols.AdditionalKDocResolutionProvider
• KT-82443 Add Ka prefix to org.jetbrains.kotlin.analysis.api.symbols.DebugSymbolRenderer
• KT-82441 Add Ka prefix to org.jetbrains.kotlin.analysis.api.compile.CodeFragmentCapturedValue
• KT-82439 Add Ka prefix to org.jetbrains.kotlin.analysis.api.components.DebuggerExtension
• KT-82438 Add Ka prefix to org.jetbrains.kotlin.analysis.api.components.DefaultTypeClassIds

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
• KT-75736 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
• KT-83537 OPERATOR_RENAMED_ON_IMPORT is not reported for 'of' operator
• KT-81567 Add a use-site warning if a @DslMarker-marked annotation is used on entities where it is a no-op
• KT-83657 [K/N] Pre-codegen inline produces invalid bitcode
• KT-82721 Inconsistent explicit backing fields behavior
• KT-83317 ClassCastException: with cast kotlin.UInt to java.lang.Number when defining constant
• KT-83314 JSpecify @NullMarked changes Java equals(Object) to equals(Any?) causing override conflict in Kotlin 2.3
• KT-83589 Explicit backing fields don't likely work with intersection overrides
• KT-83588 Explicit backing field is falsely accessible from a subclass via a substitution override
• KT-78783 K2: absence of warning for KTLC-284 migration
• KT-83363 VerifyError: "Bad type on operand stack" on multi-line suspending call with default parameter value since API version 2.4
• KT-83570 K2: Resolve problematic IR when referencing Kotlin const from annotation in Java
• KT-83362 Starting from 2.3 DefaultImpls bridge functions deprecated with the level HIDDEN are no longer synthetic
• KT-9182 Java interoperability: Overload resolution ambiguity on Java's @NotNull and primitives
• KT-83633 Forbid inline functional context parameters in inline functions
• KT-83449 compile-time IR failure on smart cast information leaking from capturing closure
• KT-82375 Add ATOMIC_REF_WITHOUT_CONSISTENT_IDENTITY warning for any argument without consistent identity
• KT-83282 JvmExposeBoxed: Duplicate annotation interface kotlin.coroutines.jvm.internal.DebugMetadata in class %class%$1 for suspend inline class value
• KT-83367 VolatileFieldsLowering may emit wrong parameter types for atomic intrinsic calls
• KT-83382 K2: Unreachable method exit breaks MUST_BE_INITIALIZED checks for succeeding value declarations
• KT-82211 False positive SENSELESS_NULL_IN_WHEN with nullable var
• KT-83157 ExplicitBackingFields: "Property with explicit backing field should be final" in 2.3.0
• KT-83269 K2: Wrong types in IR for explicit backing fields
• KT-83324 Native: problem with loops handling in types computation pass
• KT-83241 K2: "NoSuchElementException: List is empty" with top-level destructuring declaration and lambda initializer
• KT-82277 Misleading Inapplicable candidate(s): fun <K> WHEN_CALL(vararg branches: K): K when a when expression branch contains an unresolved reference
• KT-80839 Get rid of an obsolete -Xcompile-builtins-as-part-of-stdlib flag once previous changes are bootstrapped
• KT-82900 Language Feature EnhancedBridgesGeneration
• KT-82651 Do not generate self-recursive bridges in JVM backend
• KT-83185 Kotlin repeatable annotations are incorrectly deserialized from bytecode
• KT-82863 @NoInfer regression since 2.2.20
• KT-82311 Header mode: Error expression when assigning function declaration to a property
• KT-81763 Incorrect comparison result when using elvis ?: with nullable Long values
• KT-83153 Properly ignore contract statements in the Return Value Checker
• KT-78589 "Class does not have member field" caused by delegation from a Java to Kotlin class
• KT-80525 Update IntelliJ SDK dependency to 251.27812.49
• KT-74572 Context parameters: contracts don't work with context parameters

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
• KT-41082 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
• KT-82279 KJS: DCE removes external members overrides without reason
• KT-52800 KJS / IR: sealed interface with nested data classes not accessible

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
• KT-78365 [PL] Change the behavior of getting name of removed function

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
• KT-83290 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
• KT-83251 Lombok. Constructor from @Value includes fields that are initialized in declaration
• KT-83252 Lombok. Class marked with @Value isn't final
• KT-83085 Lombok: getter/setter is available for a static field if class is annotated
• KT-83078 Lombok: getter and setter are not available for a static Java field
• KT-83063 Lombok: Setter/getter is not available with a protected access level

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
• KT-78104 Deprecate CleanableStore infrastructure
• KT-83316 [BTA] Build Reports missing information when JVM compilation uses Build Tools API
• KT-83125 Deprecate out-of-process compilation mode
• KT-83161 CRI: it is not clear that CRI generation requires BTA being enabled
• KT-81830 Create autogenerated kotlin version constants to be used with disableNativeCache DSL
• KT-83322 Compile against Gradle 9.2 API
• KT-80186 Remove usage of deprecated Gradle API Project.container(...)

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