[Gradle] Do not throw exceptions when getDependenciesTransformation...

is called. Some kotlin plugins (for example JS) re-use
DefaultKotlinSourceSet class for their source sets. However
DefaultKotlinSourceSet has an API that is connected to IDE import
particularly `getDependenciesTransformation`. Since Kotlin/JS doesn't
support metadata dependencies, and their transformations as well
we should lift strong requirement for compileDependenciesTransformation
to be set for each source set. Instead, just return empty list of
transformations.

^KT-55347 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/ide/dependencyResolvers/utils.kt

@@ -7,9 +7,10 @@ package org.jetbrains.kotlin.gradle.plugin.ide.dependencyResolvers
 
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
 import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution
+import org.jetbrains.kotlin.gradle.plugin.mpp.metadataDependencyResolutionsOrEmpty
 import org.jetbrains.kotlin.gradle.plugin.sources.DefaultKotlinSourceSet
 
 internal inline fun <reified T : MetadataDependencyResolution> KotlinSourceSet.resolveMetadata(): List<T> {
     if (this !is DefaultKotlinSourceSet) return emptyList()
-    return compileDependenciesTransformation.metadataDependencyResolutions.filterIsInstance<T>()
+    return compileDependenciesTransformation.metadataDependencyResolutionsOrEmpty.filterIsInstance<T>()
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/GranularMetadataTransformation.kt

@@ -364,3 +364,5 @@ private val KotlinMultiplatformExtension.platformCompilationSourceSets: Set<Kotl
         .flatMap { target -> target.compilations }
         .flatMap { it.kotlinSourceSets }
         .toSet()
+
+internal val GranularMetadataTransformation?.metadataDependencyResolutionsOrEmpty get() = this?.metadataDependencyResolutions ?: emptyList()

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/sources/DefaultKotlinSourceSet.kt

@@ -118,20 +118,11 @@ abstract class DefaultKotlinSourceSet @Inject constructor(
         explicitlyAddedCustomSourceFilesExtensions.addAll(extensions)
     }
 
-    private var _compileDependenciesTransformation: GranularMetadataTransformation? = null
-
-    internal fun setCompileDependenciesTransformation(value: GranularMetadataTransformation) {
-        _compileDependenciesTransformation = value
-    }
-
     /**
      * Returns [GranularMetadataTransformation] for all requested compile dependencies
      * scopes: API, IMPLEMENTATION, COMPILE_ONLY; See [KotlinDependencyScope.compileScopes]
      */
-    internal val compileDependenciesTransformation: GranularMetadataTransformation
+    internal var compileDependenciesTransformation: GranularMetadataTransformation? = null
-        get() = _compileDependenciesTransformation
-            ?: error("Accessing Compile Dependencies Transformations is not yet initialised; " +
-                             "Check when setCompileDependenciesTransformation is called")
 
     private val _requiresVisibilityOf = mutableSetOf<KotlinSourceSet>()
 
@@ -164,7 +155,7 @@ abstract class DefaultKotlinSourceSet @Inject constructor(
 
     internal fun getDependenciesTransformation(): Iterable<MetadataDependencyTransformation> {
         val metadataDependencyResolutionByModule =
-            compileDependenciesTransformation.metadataDependencyResolutions
+            compileDependenciesTransformation.metadataDependencyResolutionsOrEmpty
                 .associateBy { ModuleIds.fromComponent(project, it.dependency) }
 
         return metadataDependencyResolutionByModule.mapNotNull { (groupAndName, resolution) ->
@@ -231,3 +222,8 @@ val Iterable<KotlinSourceSet>.withDependsOnClosure: Set<KotlinSourceSet>
 fun KotlinMultiplatformExtension.findSourceSetsDependingOn(sourceSet: KotlinSourceSet): Set<KotlinSourceSet> {
     return sourceSet.closure { seedSourceSet -> sourceSets.filter { otherSourceSet -> seedSourceSet in otherSourceSet.dependsOn } }
 }
+
+internal val DefaultKotlinSourceSet.compileDependenciesTransformationOrFail: GranularMetadataTransformation
+    get() = compileDependenciesTransformation
+        ?: error("Accessing Compile Dependencies Transformations that is not yet initialised; " +
+                 "Check when compileDependenciesTransformation is set")

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt

@@ -367,12 +367,12 @@ class KotlinMetadataTargetConfigurator :
             sourceSetRequestedScopes = dependencyScopesToTransform,
             parentTransformations = lazy {
                 dependsOnClosureWithInterCompilationDependencies(sourceSet).filterIsInstance<DefaultKotlinSourceSet>()
-                    .map { it.compileDependenciesTransformation }
+                    .map { it.compileDependenciesTransformationOrFail }
             }
         )
 
         if (sourceSet is DefaultKotlinSourceSet)
-            sourceSet.setCompileDependenciesTransformation(granularMetadataTransformation)
+            sourceSet.compileDependenciesTransformation = granularMetadataTransformation
 
         dependencyScopesToTransform.forEach { scope ->
             val sourceSetDependencyConfigurationByScope = project.configurations.sourceSetDependencyConfigurationByScope(sourceSet, scope)

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/CInteropMetadataDependencyClasspath.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.Choos
 import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.ChooseVisibleSourceSets.MetadataProvider.ProjectMetadataProvider
 import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.ChooseVisibleSourceSets.MetadataProvider.ProjectMetadataProvider.MetadataConsumer.Cli
 import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.ChooseVisibleSourceSets.MetadataProvider.ProjectMetadataProvider.MetadataConsumer.Ide
+import org.jetbrains.kotlin.gradle.plugin.mpp.metadataDependencyResolutionsOrEmpty
 import org.jetbrains.kotlin.gradle.plugin.sources.DefaultKotlinSourceSet
 import org.jetbrains.kotlin.gradle.utils.filesProvider
 import java.io.File
@@ -51,7 +52,7 @@ private fun Project.createCInteropMetadataDependencyClasspathFromProjectDependen
 ): FileCollection {
     return filesProvider {
         sourceSet.compileDependenciesTransformation
-            .metadataDependencyResolutions
+            .metadataDependencyResolutionsOrEmpty
             .filterIsInstance<ChooseVisibleSourceSets>()
             .flatMap { chooseVisibleSourceSets ->
                 /* We only want to access resolutions that provide metadata from dependency projects */

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/CInteropMetadataDependencyTransformationTask.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.Choos
 import org.jetbrains.kotlin.gradle.plugin.mpp.MetadataDependencyResolution.ChooseVisibleSourceSets.MetadataProvider.ProjectMetadataProvider
 import org.jetbrains.kotlin.gradle.plugin.mpp.pm20.toKpmModuleIdentifiers
 import org.jetbrains.kotlin.gradle.plugin.sources.DefaultKotlinSourceSet
+import org.jetbrains.kotlin.gradle.plugin.sources.compileDependenciesTransformationOrFail
 import org.jetbrains.kotlin.gradle.tasks.dependsOn
 import org.jetbrains.kotlin.gradle.tasks.locateOrRegisterTask
 import org.jetbrains.kotlin.gradle.tasks.withType
@@ -83,7 +84,7 @@ internal fun Project.locateOrRegisterCInteropMetadataDependencyTransformationTas
 }
 
 /**
- * The transformation tasks will internally access the lazy [GranularMetadataTransformation.metadataDependencyResolutions] property
+ * The transformation tasks will internally access the lazy [GranularMetadataTransformation.metadataDependencyResolutionsOrEmpty] property
  * which internally will potentially resolve dependencies. Having multiple tasks accessing this synchronized lazy property
  * during execution and/or configuration phase will result in an internal deadlock in Gradle
  * `DefaultResourceLockCoordinationService.withStateLock`
@@ -180,14 +181,14 @@ internal open class CInteropMetadataDependencyTransformationTask @Inject constru
     @Suppress("unused")
     @get:Classpath
     protected val inputArtifactFiles: FileCollection get() = sourceSet
-        .compileDependenciesTransformation
+        .compileDependenciesTransformationOrFail
         .configurationToResolve
         .withoutProjectDependencies()
 
     @get:Internal
     protected val chooseVisibleSourceSets
         get() = sourceSet
-            .compileDependenciesTransformation
+            .compileDependenciesTransformationOrFail
             .metadataDependencyResolutions
             .filterIsInstance<ChooseVisibleSourceSets>()