fix(runtime): use more null proto objects (#23921)

This is a primordialization effort to improve resistance against users
tampering with the global `Object` prototype.

---------

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/unit/event_test.ts b/tests/unit/event_test.ts
index c82873cf6..bd398fd41 100644
--- a/tests/unit/event_test.ts
+++ b/tests/unit/event_test.ts
@@ -141,3 +141,17 @@ Deno.test(function inspectEvent() {
     `Event {\n  bubbles: false,\n  cancelable: false,`,
   );
 });
+
+Deno.test("default argument is null prototype", () => {
+  const event = new Event("test");
+  assertEquals(event.bubbles, false);
+
+  // @ts-ignore this is on purpose to check if overriding prototype
+  // has effect on `Event.
+  Object.prototype.bubbles = true;
+  const event2 = new Event("test");
+  assertEquals(event2.bubbles, false);
+
+  // @ts-ignore this is done on purpose
+  delete Object.prototype.bubbles;
+});