[JS IR] Add per-module output module name

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

@@ -24,5 +24,7 @@ internal const val PRODUCE_ZIPPED_KLIB = "-Xir-produce-klib-file"
 
 internal const val MODULE_NAME = "-Xir-module-name"
 
+internal const val PER_MODULE_OUTPUT_NAME = "-Xir-per-module-output-name"
+
 fun KotlinJsOptions.isProduceUnzippedKlib() = PRODUCE_UNZIPPED_KLIB in freeCompilerArgs
 fun KotlinJsOptions.isProduceZippedKlib() = PRODUCE_ZIPPED_KLIB in freeCompilerArgs

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

@@ -58,6 +58,13 @@ abstract class KotlinJsIrSubTarget(
     internal fun configure() {
         NpmResolverPlugin.apply(project)
 
+        target.compilations.all {
+            val npmProject = it.npmProject
+            it.kotlinOptions {
+                freeCompilerArgs += "$PER_MODULE_OUTPUT_NAME=${npmProject.name}"
+            }
+        }
+
         configureTests()
     }