5 files changed, 20 insertions, 8 deletions
diff --git a/cli/rt/40_performance.js b/cli/rt/40_performance.js
index 573fc8051..3d8be6031 100644
--- a/cli/rt/40_performance.js
+++ b/cli/rt/40_performance.js
@@ -70,11 +70,11 @@
     }
 
     constructor(
-      name,
-      entryType,
-      startTime,
-      duration,
-      key,
+      name = null,
+      entryType = null,
+      startTime = null,
+      duration = null,
+      key = null,
     ) {
       if (key != illegalConstructorKey) {
         throw new TypeError("Illegal constructor.");
@@ -185,7 +185,7 @@
   }
 
   class Performance {
-    constructor(key) {
+    constructor(key = null) {
       if (key != illegalConstructorKey) {
         throw new TypeError("Illegal constructor.");
       }
diff --git a/cli/rt/40_permissions.js b/cli/rt/40_permissions.js
index 982e4c842..50d471b6a 100644
--- a/cli/rt/40_permissions.js
+++ b/cli/rt/40_permissions.js
@@ -17,7 +17,7 @@
   }
 
   class PermissionStatus {
-    constructor(state, key) {
+    constructor(state = null, key = null) {
       if (key != illegalConstructorKey) {
         throw new TypeError("Illegal constructor.");
       }
diff --git a/cli/tests/unit/globals_test.ts b/cli/tests/unit/globals_test.ts
index 422bd2aec..4fd531b25 100644
--- a/cli/tests/unit/globals_test.ts
+++ b/cli/tests/unit/globals_test.ts
@@ -40,6 +40,10 @@ unitTest(function globalThisInstanceofWindow(): void {
   assert(globalThis instanceof Window);
 });
 
+unitTest(function globalThisConstructorLength(): void {
+  assert(globalThis.constructor.length === 0);
+});
+
 unitTest(function globalThisInstanceofEventTarget(): void {
   assert(globalThis instanceof EventTarget);
 });
diff --git a/cli/tests/unit/performance_test.ts b/cli/tests/unit/performance_test.ts
index 1df46b1b2..122938b36 100644
--- a/cli/tests/unit/performance_test.ts
+++ b/cli/tests/unit/performance_test.ts
@@ -83,10 +83,12 @@ unitTest(function performanceMeasure() {
 
 unitTest(function performanceIllegalConstructor() {
   assertThrows(() => new Performance(), TypeError, "Illegal constructor.");
+  assertEquals(Performance.length, 0);
 });
 
 unitTest(function performanceEntryIllegalConstructor() {
   assertThrows(() => new PerformanceEntry(), TypeError, "Illegal constructor.");
+  assertEquals(PerformanceEntry.length, 0);
 });
 
 unitTest(function performanceMeasureIllegalConstructor() {
diff --git a/cli/tests/unit/permissions_test.ts b/cli/tests/unit/permissions_test.ts
index eada8fe9a..dee8aa195 100644
--- a/cli/tests/unit/permissions_test.ts
+++ b/cli/tests/unit/permissions_test.ts
@@ -1,5 +1,10 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { assertThrows, assertThrowsAsync, unitTest } from "./test_util.ts";
+import {
+  assertEquals,
+  assertThrows,
+  assertThrowsAsync,
+  unitTest,
+} from "./test_util.ts";
 
 unitTest(async function permissionInvalidName(): Promise<void> {
   await assertThrowsAsync(async () => {
@@ -24,4 +29,5 @@ unitTest(function permissionStatusIllegalConstructor() {
     TypeError,
     "Illegal constructor.",
   );
+  assertEquals(Deno.PermissionStatus.length, 0);
 });