From 46c9c13811ca20a887e2826c03852f2ccdebda7a Mon Sep 17 00:00:00 2001
From: Minijus L <3633549+minijus@users.noreply.github.com>
Date: Fri, 15 Oct 2021 13:02:33 +0300
Subject: [PATCH] fix: correct `instanceof` for `ModernFakeTimers` and
 `LegacyFakeTimers` methods (#11946)

---
 CHANGELOG.md                       | 1 +
 packages/jest-runtime/package.json | 2 +-
 packages/jest-runtime/src/index.ts | 8 ++++----
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b706156bc4b3..3a5f8474efbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Fixes
 
 - `[jest-runtime]` Ensure absolute paths can be resolved within test modules ([11943](https://github.com/facebook/jest/pull/11943))
+- `[jest-runtime]` Fix `instanceof` for `ModernFakeTimers` and `LegacyFakeTimers` methods ([#11946](https://github.com/facebook/jest/pull/11946))
 
 ### Chore & Maintenance
 
diff --git a/packages/jest-runtime/package.json b/packages/jest-runtime/package.json
index 881360f1050c..a498152b1a2e 100644
--- a/packages/jest-runtime/package.json
+++ b/packages/jest-runtime/package.json
@@ -16,7 +16,6 @@
   "dependencies": {
     "@jest/console": "^27.2.5",
     "@jest/environment": "^27.2.5",
-    "@jest/fake-timers": "^27.2.5",
     "@jest/globals": "^27.2.5",
     "@jest/source-map": "^27.0.6",
     "@jest/test-result": "^27.2.5",
@@ -43,6 +42,7 @@
     "yargs": "^16.2.0"
   },
   "devDependencies": {
+    "@jest/fake-timers": "^27.2.5",
     "@jest/test-utils": "^27.2.5",
     "@types/exit": "^0.1.30",
     "@types/glob": "^7.1.1",
diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts
index c8cfa5c17246..8640b45ea405 100644
--- a/packages/jest-runtime/src/index.ts
+++ b/packages/jest-runtime/src/index.ts
@@ -30,7 +30,7 @@ import type {
   Module,
   ModuleWrapper,
 } from '@jest/environment';
-import {LegacyFakeTimers, ModernFakeTimers} from '@jest/fake-timers';
+import type {LegacyFakeTimers, ModernFakeTimers} from '@jest/fake-timers';
 import type * as JestGlobals from '@jest/globals';
 import type {SourceMapRegistry} from '@jest/source-map';
 import type {RuntimeTransformResult, V8CoverageResult} from '@jest/test-result';
@@ -1963,7 +1963,7 @@ export default class Runtime {
       getRealSystemTime: () => {
         const fakeTimers = _getFakeTimers();
 
-        if (fakeTimers instanceof ModernFakeTimers) {
+        if (fakeTimers === this._environment.fakeTimersModern) {
           return fakeTimers.getRealSystemTime();
         } else {
           throw new TypeError(
@@ -1984,7 +1984,7 @@ export default class Runtime {
       runAllImmediates: () => {
         const fakeTimers = _getFakeTimers();
 
-        if (fakeTimers instanceof LegacyFakeTimers) {
+        if (fakeTimers === this._environment.fakeTimers) {
           fakeTimers.runAllImmediates();
         } else {
           throw new TypeError(
@@ -2000,7 +2000,7 @@ export default class Runtime {
       setSystemTime: (now?: number | Date) => {
         const fakeTimers = _getFakeTimers();
 
-        if (fakeTimers instanceof ModernFakeTimers) {
+        if (fakeTimers === this._environment.fakeTimersModern) {
           fakeTimers.setSystemTime(now);
         } else {
           throw new TypeError(