Gradle, js: don't use any subtarget by default

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

@@ -36,16 +36,12 @@ class KotlinJsTarget(project: Project, platformType: KotlinPlatformType) :
     val runTaskName get() = lowerCamelCaseName(disambiguationClassifier, runTaskNameSuffix)
     val runTask get() = project.tasks.maybeCreate(runTaskName)
 
-    private var hasSubtargets = false
-
     val browser by lazy {
-        hasSubtargets = true
         KotlinBrowserJs(this).also {
             it.configure()
         }
     }
     val nodejs by lazy {
-        hasSubtargets = true
         KotlinNodeJs(this).also {
             it.configure()
         }
@@ -58,10 +54,4 @@ class KotlinJsTarget(project: Project, platformType: KotlinPlatformType) :
     override fun nodejs(body: KotlinJsNodeDsl.() -> Unit) {
         nodejs.body()
     }
-
-    fun configureDefaults() {
-        if (!hasSubtargets) {
-            browser()
-        }
-    }
 }

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

@@ -19,7 +19,6 @@ open class KotlinJsTargetConfigurator(kotlinPluginVersion: String) :
     override fun configureTarget(target: KotlinOnlyTarget<KotlinJsCompilation>) {
         target as KotlinJsTarget
 
-        target.configureDefaults()
         super.configureTarget(target)
 
         target.compilations.forEach {