1 files changed, 11 insertions, 4 deletions
diff --git a/js/src/vm/NativeObject.h b/js/src/vm/NativeObject.h
index 4dbc167ab..da4f873a6 100644
--- a/js/src/vm/NativeObject.h
+++ b/js/src/vm/NativeObject.h
@@ -339,16 +339,19 @@ IsObjectValueInCompartment(const Value& v, JSCompartment* comp);
 #endif
 
 // Operations which change an object's dense elements can either succeed, fail,
-// or be unable to complete. For native objects, the latter is used when the
-// object's elements must become sparse instead. The enum below is used for
-// such operations, and for similar operations on unboxed arrays and methods
-// that work on both kinds of objects.
+// or be unable to complete. The latter is used when the object's elements must
+// become sparse instead. The enum below is used for such operations.
 enum class DenseElementResult {
     Failure,
     Success,
     Incomplete
 };
 
+enum class ShouldUpdateTypes {
+    Update,
+    DontUpdate
+};
+
 /*
  * NativeObject specifies the internal implementation of a native object.
  *
@@ -1147,6 +1150,10 @@ class NativeObject : public ShapedObject
         elementsRangeWriteBarrierPost(dstStart, count);
     }
 
+    inline DenseElementResult
+    setOrExtendDenseElements(JSContext* cx, uint32_t start, const Value* vp, uint32_t count,
+                             ShouldUpdateTypes updateTypes = ShouldUpdateTypes::Update);
+
     bool shouldConvertDoubleElements() {
         return getElementsHeader()->shouldConvertDoubleElements();
     }