[Gradle, JS] Fix for output file

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -530,7 +530,7 @@ abstract class AbstractKotlin2JsGradlePluginIT(protected val irBackend: Boolean)
                     ":compileTestKotlin2Js"
                 )
                 if (irBackend) {
-                    assertFileInProjectExists("build/kotlin2js/main/module.js/default/manifest")
+                    assertFileInProjectExists("build/kotlin2js/main/default/manifest")
                 } else {
                     assertFileInProjectExists("build/kotlin2js/main/module.js")
                 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlin2JsProjectWithTests/build.gradle

@@ -28,10 +28,12 @@ artifacts {
     implementation jarSources
 }
 
-compileKotlin2Js.kotlinOptions.outputFile = "${buildDir}/kotlin2js/main/module.js"
 compileTestKotlin2Js.kotlinOptions.outputFile = "${buildDir}/kotlin2js/test/module-tests.js"
 
 if (project.findProperty("kotlin.js.useIrBackend")?.toBoolean() == true) {
     compileKotlin2Js.kotlinOptions.freeCompilerArgs += ["-Xir-produce-klib-dir", "-Xir-only"]
     compileTestKotlin2Js.kotlinOptions.freeCompilerArgs += ["-Xir-produce-js"]
+    compileKotlin2Js.kotlinOptions.outputFile = "${buildDir}/kotlin2js/main/"
+} else {
+    compileKotlin2Js.kotlinOptions.outputFile = "${buildDir}/kotlin2js/main/module.js"
 }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/tasks/configuration/Kotlin2JsCompileConfig.kt

@@ -57,7 +57,8 @@ internal open class BaseKotlin2JsCompileConfig<TASK : Kotlin2JsCompile>(
                             val freeArgs = task.enhancedFreeCompilerArgs.get()
                             if (task.compilerOptions.outputFile.orNull != null) {
                                 if (freeArgs.contains(PRODUCE_UNZIPPED_KLIB)) {
-                                    File(task.compilerOptions.outputFile.get())
+                                    val file = File(task.compilerOptions.outputFile.get())
+                                    if (file.extension == "") file else file.parentFile
                                 } else {
                                     File(task.compilerOptions.outputFile.get()).parentFile
                                 }