[Gradle, JS] binaries executable for legacy by default

^KT-40320 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinProperties.kt

@@ -202,6 +202,12 @@ internal class PropertiesProvider private constructor(private val project: Proje
     val jsCompiler: KotlinJsCompilerType
         get() = property(jsCompilerProperty)?.let { KotlinJsCompilerType.byArgumentOrNull(it) } ?: KotlinJsCompilerType.LEGACY
 
+    /**
+     * Use Kotlin/JS backend compiler type
+     */
+    val jsLegacyExecutableExplicitly: Boolean
+        get() = booleanProperty("kotlin.js.legacy.executable.explicitly") ?: false
+
     val stdlibDefaultDependency: Boolean
         get() = booleanProperty("kotlin.stdlib.default.dependency") ?: true
 

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

@@ -136,6 +136,10 @@ constructor(
         project.objects.newInstance(KotlinBrowserJs::class.java, this).also {
             it.configure()
 
+            if (!PropertiesProvider(project).jsLegacyExecutableExplicitly) {
+                binaries.executable()
+            }
+
             browserConfiguredHandlers.forEach { handler ->
                 handler(it)
             }
@@ -158,6 +162,11 @@ constructor(
     private val nodejsLazyDelegate = lazy {
         project.objects.newInstance(KotlinNodeJs::class.java, this).also {
             it.configure()
+
+            if (!PropertiesProvider(project).jsLegacyExecutableExplicitly) {
+                binaries.executable()
+            }
+
             nodejsConfiguredHandlers.forEach { handler ->
                 handler(it)
             }