feat: add new esnext types (#11627)

1 files changed, 12 insertions, 1 deletions

diff --git a/cli/tests/unit/esnext_test.ts b/cli/tests/unit/esnext_test.ts
index 558c678bc..5d858e267 100644
--- a/cli/tests/unit/esnext_test.ts
+++ b/cli/tests/unit/esnext_test.ts
@@ -1,5 +1,5 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
-import { assertEquals, unitTest } from "./test_util.ts";
+import { assert, assertEquals, unitTest } from "./test_util.ts";
 
 // TODO(@kitsonk) remove when we are no longer patching TypeScript to have
 // these types available.
@@ -10,3 +10,14 @@ unitTest(function typeCheckingEsNextArrayString() {
   const b = ["a", "b", "c", "d", "e", "f"];
   assertEquals(b.at(-1), "f");
 });
+
+unitTest(function objectHasOwn() {
+  const a = { a: 1 };
+  assert(Object.hasOwn(a, "a"));
+  assert(!Object.hasOwn(a, "b"));
+});
+
+unitTest(function errorCause() {
+  const e = new Error("test", { cause: "something" });
+  assertEquals(e.cause, "something");
+});