Bump to Kotlin 2.1

[nhachicha]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the project to Kotlin 2.1, which includes a major upgrade of the build system and language toolchain. The changes involve updating compiler plugin code to accommodate breaking API changes in Kotlin 2.1's FIR (Frontend Intermediate Representation) and IR (Intermediate Representation) components.

Key Changes:

• Updated Kotlin from 2.0.20 to 2.1.0 and corresponding build tool versions (Gradle from 7.6 to 8.12, Android build tools from 7.3.1 to 8.7.3)
• Modified compiler plugin code to use updated Kotlin 2.1 APIs (e.g., .type to .coneType, removed valueArgumentsCount parameters)
• Updated JVM target from 1.8 to 11 and CI/CD infrastructure to use Java 17

Reviewed Changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
buildSrc/src/main/kotlin/Config.kt	Updated version constants for Kotlin, Android SDK, Gradle, and JVM target
packages/plugin-compiler/src/main/kotlin/io/realm/kotlin/compiler/fir/model/*.kt	Adapted FIR code generation to use .coneType instead of .type and removed session parameter
packages/plugin-compiler/src/main/kotlin/io/realm/kotlin/compiler/*.kt	Updated IR code to remove deprecated valueArgumentsCount parameter and add required type casts
packages/plugin-compiler/src/main/kotlin/io/realm/kotlin/compiler/IrUtils.kt	Updated type references and added generic type handling for annotation values
packages/test-base/src/jvmMain/kotlin/io/realm/kotlin/test/util/Compiler.kt	Set JVM target to 11 for test compilation
gradle/wrapper/gradle-wrapper.properties	Updated Gradle from 7.6 to 8.12
.github/workflows/*.yml	Updated CI/CD to use Java 17 and macOS 13 runners

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The variable linkPropertyName should be typed as IrConst<String> instead of IrConst to maintain type safety. The generic type parameter was removed but the variable holds string constants, making the type overly broad.

Suggested change

	val linkPropertyName: IrConst = if (type == linkingObjectType) {
	val linkPropertyName: IrConst<String> = if (type == linkingObjectType) {

[Copilot]

The fallback to empty string when value is null could mask genuine issues. If getValueArgument(0) returns a non-null IrConstImpl but its value is null, this suggests a problem with the annotation that should be handled explicitly rather than silently defaulting to an empty string.

Suggested change

	return (declaration.getAnnotation(PERSISTED_NAME_ANNOTATION.asSingleFqName()).getValueArgument(0)!! as IrConstImpl).value?.toString() ?: ""
	val annotation = declaration.getAnnotation(PERSISTED_NAME_ANNOTATION.asSingleFqName())
	val valueArgument = annotation.getValueArgument(0)
	if (valueArgument == null || valueArgument !is IrConstImpl<*>) {
	throw IllegalStateException("PersistedName annotation is missing or malformed on property '${declaration.name.identifier}'.")
	}
	val value = valueArgument.value
	if (value == null) {
	throw IllegalStateException("PersistedName annotation value is null on property '${declaration.name.identifier}'.")
	}
	return value.toString()

[Copilot]

The fallback to empty string when value is null could mask genuine issues. If the annotation value is null, this likely indicates a problem that should be handled explicitly rather than silently returning an empty string, which could lead to incorrect schema generation.

Suggested change

	return (clazz.getAnnotation(PERSISTED_NAME_ANNOTATION.asSingleFqName()).getValueArgument(0)!! as IrConstImpl).value?.toString() ?: ""
	val annotationValue = (clazz.getAnnotation(PERSISTED_NAME_ANNOTATION.asSingleFqName()).getValueArgument(0)!! as IrConstImpl).value
	if (annotationValue == null) {
	fatalError("Persisted name annotation value is null for class ${clazz.name.identifier}")
	}
	return annotationValue.toString()

[Copilot]

These error messages lack context. Include the class name in the error messages to help identify which annotation class is causing the problem. For example: \"defaultType is not an IrType for class ${modelObjectAnnotationClass.name}\"

Suggested change

	val type = modelObjectAnnotationClass.defaultType as? IrType ?: throw IllegalStateException("defaultType is not an IrType")
	val primaryConstructor = modelObjectAnnotationClass.primaryConstructor ?: throw IllegalStateException("primaryConstructor is null")
	val constructorSymbol = primaryConstructor.symbol as? IrConstructorSymbol ?: throw IllegalStateException("symbol is not an IrConstructorSymbol")
	val type = modelObjectAnnotationClass.defaultType as? IrType ?: throw IllegalStateException("defaultType is not an IrType for class ${modelObjectAnnotationClass.name}")
	val primaryConstructor = modelObjectAnnotationClass.primaryConstructor ?: throw IllegalStateException("primaryConstructor is null for class ${modelObjectAnnotationClass.name}")
	val constructorSymbol = primaryConstructor.symbol as? IrConstructorSymbol ?: throw IllegalStateException("symbol is not an IrConstructorSymbol for class ${modelObjectAnnotationClass.name}")

[clementetb]

Looks good, it was not straight forward...