1 files changed, 16 insertions, 2 deletions
diff --git a/src/bun.js/bindings/bindings.cpp b/src/bun.js/bindings/bindings.cpp
index 5c9cba7f0..d431a287f 100644
--- a/src/bun.js/bindings/bindings.cpp
+++ b/src/bun.js/bindings/bindings.cpp
@@ -3227,13 +3227,21 @@ void JSC__VM__releaseWeakRefs(JSC__VM* arg0)
 static auto function_string_view = MAKE_STATIC_STRING_IMPL("Function");
 void JSC__JSValue__getClassName(JSC__JSValue JSValue0, JSC__JSGlobalObject* arg1, ZigString* arg2)
 {
-    JSC::JSCell* cell = JSC::JSValue::decode(JSValue0).asCell();
+    JSValue value = JSValue::decode(JSValue0);
+    JSC::JSCell* cell = value.asCell();
     if (cell == nullptr) {
         arg2->len = 0;
         return;
     }
 
-    const char* ptr = cell->className();
+    JSObject* obj = value.toObject(arg1);
+    StringView calculated = StringView(JSObject::calculatedClassName(obj));
+    if (calculated.length() > 0) {
+        *arg2 = Zig::toZigString(calculated);
+        return;
+    }
+
+    const char* ptr = cell->classInfo()->className;
     auto view = WTF::StringView(ptr, strlen(ptr));
 
     // Fallback to .name if className is empty
@@ -3784,6 +3792,12 @@ void JSC__JSValue__forEachPropertyOrdered(JSC__JSValue JSValue0, JSC__JSGlobalOb
     }
 }
 
+bool JSC__JSValue__isConstructor(JSC__JSValue JSValue0)
+{
+    JSValue value = JSValue::decode(JSValue0);
+    return value.isConstructor();
+}
+
 extern "C" JSC__JSValue JSC__JSValue__createRopeString(JSC__JSValue JSValue0, JSC__JSValue JSValue1, JSC__JSGlobalObject* globalObject)
 {
     return JSValue::encode(JSC::jsString(globalObject, JSC::JSValue::decode(JSValue0).toString(globalObject), JSC::JSValue::decode(JSValue1).toString(globalObject)));