Info about particular features

• KT-25960 Kapt: Support new @JvmDefault functionality
• KT-40030 Parcelize: Support the new Parcelize plugin in Gradle
• KT-41799 String.replace performance improvements
• KT-41622 IDE: Kotlin scripting support can’t find context class from same project

CHANGELOG

1.4.20-M2

Android

• KT-42121 Deprecate Kotlin Android Extensions compiler plugin
• KT-42267 Platform declaration clash error in IDE when using kotlinx.android.parcel.Parcelize
• KT-42406 Long or infinite code analysis on simple files modification

Compiler

• KT-11713 Refine visibility check for synthetic property with protected setter
• KT-21147 JEP 280: Indify String Concatenation (StringConcatFactory)
• KT-34178 Scripts should be able to access imports objects
• KT-41484 JVM IR: support -Xemit-jvm-type-annotations
• KT-42005 JVM / IR: "NullPointerException: Parameter specified as non-null is null" when toString is called on inline class with not primitive property
• KT-42450 NI: "IllegalStateException: Error type encountered: NonFixed:" with coroutines
• KT-42523 Missed DefaultImpls for interface in -jvm-default=all mode on inheriting it from interface compiled in old scheme
• KT-42524 Wrong specialization diagnostic is reported on inheriting from java interface with default with -Xjvm-default=all-compatibility
• KT-42546 HMPP: bogus overload resolution ambiguity on using and expect-function declaration with nullable expect in a signature

Docs & Examples

• KT-42318 No documentation for kotlin.js.js

IDE

• KT-38959 IDE: False negative EXPLICIT_DELEGATION_CALL_REQUIRED, "IllegalArgumentException: Range must be inside element being annotated"

IDE. Debugger

• KT-38659 Evaluate Expression: toString() on variable returns error when breakpoint is in commonTest sourceset

IDE. Decompiler, Indexing, Stubs

• KT-28732 Stub file element types should be registered early enough
• KT-41346 IDE: "AssertionError: Stub type mismatch: USER_TYPE!=REFERENCE_EXPRESSION" with CollapsedDumpParser class from IDEA SDK
• KT-41859 File analysis never ending with kotlinx.cli (AssertionError: Stub type mismatch: TYPEALIAS!=CLASS)

IDE. Gradle. Script

• KT-41141 Gradle Kotlin DSL: "cannot access 'java.lang.Comparable'. Check your module classpath" with empty JDK in Project structure

IDE. Inspections and Intentions

• KT-38915 "Remove explicit type specification" intention should be disabled in explicit API mode
• KT-38981 "Specify return type explicitly" inspection is not reported for declaration annotated with @PublishedApi in Explicit Api mode
• KT-39026 'Specify return type explicitly' intention duplicates compiler warning in Explicit api mode

IDE. Script

• KT-41622 IDE: Kotlin scripting support can't find context class from same project
• KT-41905 IDE / Script: FilePathPattern parameter in @KotlinScript annotation is not reflected correctly in Pattern / Extension
• KT-42206 Cannot load script definitions using org.jetbrains.kotlin.jsr223.ScriptDefinitionForExtensionAndIdeConsoleRootsSource

IDE. Tests Support

• KT-37799 Don't show a target choice in context menu for a test launched on specific platform

IDE. Wizards

• KT-42372 Rrename test classes in wizard template to avoid name clashing

JavaScript

• KT-38136 JS IR BE: add an ability to generate separate js files for each module and maybe each library
• KT-38868 [MPP / JS / IR] IllegalStateException: "Serializable class must have single primary constructor" for expect class without primary constructor with @serializable annotation
• KT-41275 KJS / IR: "IllegalStateException: Can't find name for declaration FUN" caused by default value in constructor parameter
• KT-41627 KJS / IR / Serialization: IllegalStateException: Serializable class must have single primary constructor

KMM Plugin

• KT-41522 KMM: exceptions for Mobile Multiplatform plugin are suggested to report to Google, not JetBrains
• KT-42065 [KMM plugin] iOS apps fail to launch on iOS simulator with Xcode 12

Libraries

• KT-41799 String.replace performance improvements

Native. C and ObjC Import

• KT-41250 [C-interop] Stubs for C functions without parameter names should have non-stable names

Native. Platform libraries

• KT-42191 Support for Xcode 12

Native. Runtime. Memory

• KT-42275 "Memory.cpp:1605: runtime assert: Recursive GC is disallowed" sometimes when using Kotlin from Swift deinit

Native. Stdlib

• KT-39145 MutableData append method

Tools. Compiler Plugins

• KT-36329 Provide diagnostic in kotlinx.serialization when custom serializer mismatches property type
• KT-40030 Move the Parcelize functionality out of the Android Extensions plugin

Tools. Gradle. JS

• KT-39838 Kotlin/JS Gradle tooling: NPM dependencies of different kinds with different versions of the same package fail with "Cannot find package@version in yarn.lock"
• KT-40202 Kotlin/JS: Gradle: NPM version range operators are written into package.json as escape sequences
• KT-40986 KJS / Gradle: BuildOperationQueueFailure when two different versions of js library are used as dependencies
• KT-42222 KJS / Gradle: "Cannot find package@version in yarn.lock" when npm dependencies of one package but with different version are used in project
• KT-42339 Support dukat binaries generation

Tools. Gradle. Native

• KT-40999 CocoaPods Gradle plugin: Support custom cinterop options when declaring a pod dependency.
• KT-41844 Kotlin 1.4.10 gradle configuration error with cocoapods using multiple multiplatform modules

Tools. Scripts

• KT-37987 Kotlin script: hyphen arguments not forwarded to script
• KT-39502 Scripting: reverse order of Severity enum so that ERROR > INFO
• KT-42335 No "caused by" info about an exception that thrown in Kotlin Script

Tools. kapt

• KT-25960 Interfaces annotated with JvmDefault has wrong modifiers during annotation processing
• KT-37732 Kapt task is broken after update to 1.3.70/1.3.71