1 files changed, 8 insertions, 0 deletions
diff --git a/js/headers_test.ts b/js/headers_test.ts
index 6980c3d7e..e40efcda6 100644
--- a/js/headers_test.ts
+++ b/js/headers_test.ts
@@ -169,3 +169,11 @@ test(function headerSymbolIteratorSuccess() {
     assertEqual(value, headers.get(key));
   }
 });
+
+test(function headerTypesAvailable() {
+  function newHeaders(): Headers {
+    return new Headers();
+  }
+  const headers = newHeaders();
+  assert(headers instanceof Headers);
+});