[Gradle, JS] Add disambiguation classifier for MPP

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTargetPreset.kt

@@ -15,6 +15,7 @@ import org.jetbrains.kotlin.gradle.targets.js.KotlinJsTargetConfigurator
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrSingleTargetPreset
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrTargetConfigurator
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrTargetPreset
+import org.jetbrains.kotlin.gradle.utils.lowerCamelCaseName
 
 open class KotlinJsTargetPreset(
     project: Project,
@@ -40,6 +41,16 @@ open class KotlinJsTargetPreset(
         }
     }
 
+    override fun provideTargetDisambiguationClassifier(target: KotlinOnlyTarget<KotlinJsCompilation>): String? =
+        if (irPreset == null) {
+            super.provideTargetDisambiguationClassifier(target)
+        } else {
+            lowerCamelCaseName(
+                LEGACY_DISAMBIGUATION_CLASSIFIER,
+                super.provideTargetDisambiguationClassifier(target)
+            )
+        }
+
     override fun createKotlinTargetConfigurator() = KotlinJsTargetConfigurator(
         kotlinPluginVersion,
         irPreset?.let { KotlinJsIrTargetConfigurator(kotlinPluginVersion) }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrTargetPreset.kt

@@ -26,6 +26,9 @@ open class KotlinJsIrTargetPreset(
         return project.objects.newInstance(KotlinJsIrTarget::class.java, project, platformType)
     }
 
+    // TODO Remove when IR and Legacy targets swap
+    override fun provideTargetDisambiguationClassifier(target: KotlinOnlyTarget<KotlinJsIrCompilation>): String? = "js"
+
     override fun createKotlinTargetConfigurator(): KotlinOnlyTargetConfigurator<KotlinJsIrCompilation, KotlinJsIrTarget> =
         KotlinJsIrTargetConfigurator(kotlinPluginVersion)