1 files changed, 9 insertions, 1 deletions
diff --git a/runtime/js/40_performance.js b/runtime/js/40_performance.js
index 0a63dc704..b9c873270 100644
--- a/runtime/js/40_performance.js
+++ b/runtime/js/40_performance.js
@@ -99,6 +99,8 @@
   }
 
   class PerformanceMark extends PerformanceEntry {
+    [Symbol.toStringTag] = "PerformanceMark";
+
     #detail = null;
 
     get detail() {
@@ -111,8 +113,12 @@
 
     constructor(
       name,
-      { detail = null, startTime = now() } = {},
+      options = {},
     ) {
+      if (typeof options !== "object") {
+        throw new TypeError("Invalid options");
+      }
+      const { detail = null, startTime = now() } = options;
       super(name, "mark", startTime, 0, illegalConstructorKey);
       if (startTime < 0) {
         throw new TypeError("startTime cannot be negative");
@@ -140,6 +146,8 @@
   }
 
   class PerformanceMeasure extends PerformanceEntry {
+    [Symbol.toStringTag] = "PerformanceMeasure";
+
     #detail = null;
 
     get detail() {