1 files changed, 8 insertions, 0 deletions
diff --git a/deps/v8/src/builtins/builtins-callsite.cc b/deps/v8/src/builtins/builtins-callsite.cc
index c41626dfd4..b580bb181f 100644
--- a/deps/v8/src/builtins/builtins-callsite.cc
+++ b/deps/v8/src/builtins/builtins-callsite.cc
@@ -137,6 +137,14 @@ BUILTIN(CallSitePrototypeGetTypeName) {
   return *it.Frame()->GetTypeName();
 }
 
+BUILTIN(CallSitePrototypeIsAsync) {
+  HandleScope scope(isolate);
+  CHECK_CALLSITE(recv, "isAsync");
+  FrameArrayIterator it(isolate, GetFrameArray(isolate, recv),
+                        GetFrameIndex(isolate, recv));
+  return isolate->heap()->ToBoolean(it.Frame()->IsAsync());
+}
+
 BUILTIN(CallSitePrototypeIsConstructor) {
   HandleScope scope(isolate);
   CHECK_CALLSITE(recv, "isConstructor");