Sourced from org.jetbrains.kotlin:kotlin-gradle-plugin's releases.

Kotlin 2.3.20

Changelog

Analysis API. FIR

New Features

• KT-78090 Implement stubs support for new conditional returns and holdsIn contracts

Fixes

• KT-82948 'FirRegularClass' expected as a containing declaration, got 'FirTypeAliasImpl'
• KT-83467 Package-level JSpecify annotations are ignored when coming from jars or libraries
• KT-82057 K2. Cannot infer type parameter 'R' in Ktor routing post() function with explicit response type
• KT-82846 AA: unresolved KtExpression.expressionType for the reference to the parameter with default value
• KT-80485 False positive UNRESOLVED_REFERENCE on nested interface from super-super class in the super type position inside an anonymous object
• KT-82772 Flaky false positive deprecation warning on PersistentMap.put in Kotlin repo in IDE mode
• KT-76487 StdLibSourcesLazyDeclarationResolveTestGenerated.testWrappedInt is unstable
• KT-82618 Various tests are failing with NPE in kt-master after updating the compiler on 19.11.25
• KT-82076 Error querying members of JavaClass created for SymbolLightClassForAnnotationClass during library analysis
• KT-71596 Include Js/Wasi checkers in AbstractLLFirDiagnosticsCollector
• KT-82085 No OUTER_CLASS_ARGUMENTS_REQUIRED on type parameter bound in IDE
• KT-81873 Provide a way of including traces in phase JFR events
• KT-71929 Consider leaving the non-post-compute version at EnhancementSymbolsCache.enhancedFunctions

Analysis API. Infrastructure

• KT-83173 Analysis API Tests: Library names with RC versions aren't sanitised
• KT-65140 LL FIR: Implement AbstractFirPsiJsDiagnosticTest for LL FIR
• KT-82212 [Analysis API, LL FIR] Implement AbstractDiagnosticsFirWasmTest and AbstractDiagnosticsFirWasmWasiTest for LL FIR

Analysis API. Light Classes

• KT-82227 Value classes should expose regular static methods

Analysis API. PSI

• KT-81710 'KtTypeReference.getTypeText' does not account for 'suspend' modifier on suspend lambdas
• KT-82258 Prepare PSI for migration from context receivers to context parameters
• KT-81074 KDoc: List rendering is broken

Analysis API. Providers and Caches

• KT-82449 K2 IDE Analysis Freezes During Gradle Sync (Recursive Module Dependency Computation in KotlinModuleDependentsProviderBase.computeTransitiveDependents)
• KT-82629 'collectDiagnostics' returns stale syntax error after editor fix
• KT-74907 Analysis API: Apply platform-based library module content restrictions consistently

Analysis API. Standalone

• KT-81107 AA: KtSourceModuleBuilder.sourceRoots doesn't works with symbolic links

... (truncated)

Sourced from org.jetbrains.kotlin:kotlin-gradle-plugin's changelog.

2.3.20-RC3

Tools. Gradle. JS

• KT-84772 Bundled yarn.lock for kotlinWasmToolingSetup does not include @swc/helpers@0.5.17

Tools. Gradle. Native

• KT-84759 iosX64 should not be marked as deprecated in Kotlin Gradle DSL

2.3.20-RC2

Compiler

• KT-84620 Incorrect optimization of property delegation
• KT-81974 Do not eagerly initialize reflection for KProperty objects for delegated properties

JVM. Reflection

• KT-84600 Performance regression around Kotlin properties JVM reflection during instantiation

Tools. Build Tools API

• KT-84577 BTA: API 2.3.20 incompatible with compiler 2.3.10

Tools. Compiler plugins. Compose

• KT-84218 [2.3.20-Beta1] "IllegalStateException: no implementation for FUN MISSING_DECLARATION" during bitcode lowering

Tools. Gradle

• KT-84152 Memory Leak and OOM Errors in Kotlin Gradle Plugin 2.3.20-Beta2 with in-process execution mode

2.3.20-RC

Backend. Wasm

• KT-82649 K/Wasm: Rewrite StringBuilder to use JsString
• KT-83995 K/Wasm: 2.3.0 -> 2.3.20-Beta1 degradation in arrow tests
• KT-83839 K/Wasm: CMP. Load time on Safari significantly increased with Kotlin = 2.3.20-Beta1

Compiler

• KT-83372 compileDebugKotlinAndroid hangs in 2.3.0 with SQLDelight
• KT-83849 False-positive NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS for Optional.orElse(null) call
• KT-84192 "Member overrides different '@Throws' filter from" caused by overriding in different module
• KT-83697 Native: increased bitcode produced with enabled safe casts
• KT-83984 Data races around kotlinx.serialization plugin protobuf extensions registration

... (truncated)

• d57eb4a Add ChangeLog for 2.3.20-RC3
• 41886bb [Gradle] Update KGP npm tooling dependency versions
• 210a9bd [Native] Do not mark iosX64 target as deprecate in DSL
• 7ed446e Add ChangeLog for 2.3.20-RC2
• 520eade [K/JVM] Fix incorrect optimization of local delegation
• 7ef8bcc Reflection: add LazyKProperty to fix recent performance regression
• 9fa7cf2 [Gradle] Link NoActiveThreadsAfterCompilerInvocationIT with KT-84566
• d410596 [Gradle] Shutdown coroutines dispatcher threads after compiler invocation
• 348430b [BTA] Fix compatibility between API 2.3.20 and KC 2.3.10
• 4058f3c [CMP] HiddenFromObjC remove outdated offset check
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