From 60c6595237a98c4c36432535ae32a2b0ebe88087 Mon Sep 17 00:00:00 2001
From: Sergej Jaskiewicz <sergej.jaskiewicz@jetbrains.com>
Date: Wed, 25 Jun 2025 14:59:14 +0200
Subject: [PATCH 1/2] Rename KClass<*>.isInterface helper in the JS part

We are going to introduce a new KClass member in
the standard library with the same name marked
with an opt-in annotation, so in the usages of this
extension property would stop compiling because
the member is always favored and there is no opt-in.

See KT-78581
---
 core/jsMain/src/kotlinx/serialization/internal/Platform.kt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/jsMain/src/kotlinx/serialization/internal/Platform.kt b/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
index 72625567f..83edeed11 100644
--- a/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
+++ b/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
@@ -26,7 +26,7 @@ internal actual fun <T : Any> KClass<T>.compiledSerializerImpl(): KSerializer<T>
         else this.js.asDynamic().Companion?.serializer()
         ) as? KSerializer<T>
 
-internal actual fun <T: Any> KClass<T>.isInterface(): Boolean = isInterface
+internal actual fun <T: Any> KClass<T>.isInterface(): Boolean = isInterfaceHack
 
 internal actual fun <T> createCache(factory: (KClass<*>) -> KSerializer<T>?): SerializerCache<T> {
     return object: SerializerCache<T> {
@@ -73,8 +73,10 @@ internal actual fun isReferenceArray(rootClass: KClass<Any>): Boolean = rootClas
  * WARNING: may be broken in arbitrary time in the future without notice
  *
  * Should be eventually replaced with compiler intrinsics
+ *
+ * TODO: Remove this when KT-78581 lands into a release
  */
-private val KClass<*>.isInterface: Boolean
+private val KClass<*>.isInterfaceHack: Boolean
     get(): Boolean {
         // .js throws an exception for Nothing
         if (this === Nothing::class) return false

From 293f72587208fe6779680e729488d303ad81c9e1 Mon Sep 17 00:00:00 2001
From: Leonid Startsev <sandwwraith@users.noreply.github.com>
Date: Wed, 25 Jun 2025 15:18:35 +0200
Subject: [PATCH 2/2] Update
 core/jsMain/src/kotlinx/serialization/internal/Platform.kt

---
 core/jsMain/src/kotlinx/serialization/internal/Platform.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/jsMain/src/kotlinx/serialization/internal/Platform.kt b/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
index 83edeed11..63f48bcb3 100644
--- a/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
+++ b/core/jsMain/src/kotlinx/serialization/internal/Platform.kt
@@ -74,7 +74,7 @@ internal actual fun isReferenceArray(rootClass: KClass<Any>): Boolean = rootClas
  *
  * Should be eventually replaced with compiler intrinsics
  *
- * TODO: Remove this when KT-78581 lands into a release
+ * TODO: Remove this when KT-78581 lands into a 2.2.20 release
  */
 private val KClass<*>.isInterfaceHack: Boolean
     get(): Boolean {