From ecb0a9b89ace05187b8110ed3653bb570107340b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adem=C3=ADlson=20F=2E=20Tonato?=
 <5417662+ftonato@users.noreply.github.com>
Date: Sun, 16 May 2021 07:39:26 +0100
Subject: [PATCH] refactor: use nullish coalescing operator on
 getProjectDisplayName (#11410)

---
 packages/expect/src/utils.ts                      | 2 --
 packages/jest-core/src/getProjectDisplayName.ts   | 6 +-----
 packages/jest-fake-timers/src/legacyFakeTimers.ts | 3 +--
 3 files changed, 2 insertions(+), 9 deletions(-)

diff --git a/packages/expect/src/utils.ts b/packages/expect/src/utils.ts
index d59efca71fd3..858f7a7d03cb 100644
--- a/packages/expect/src/utils.ts
+++ b/packages/expect/src/utils.ts
@@ -350,9 +350,7 @@ export const partition = <T>(
 export const isError = (value: unknown): value is Error => {
   switch (Object.prototype.toString.call(value)) {
     case '[object Error]':
-      return true;
     case '[object Exception]':
-      return true;
     case '[object DOMException]':
       return true;
     default:
diff --git a/packages/jest-core/src/getProjectDisplayName.ts b/packages/jest-core/src/getProjectDisplayName.ts
index d9e8271c622a..b903c6e35ee8 100644
--- a/packages/jest-core/src/getProjectDisplayName.ts
+++ b/packages/jest-core/src/getProjectDisplayName.ts
@@ -10,9 +10,5 @@ import type {Config} from '@jest/types';
 export default function getProjectDisplayName(
   projectConfig: Config.ProjectConfig,
 ): string | undefined {
-  const {displayName} = projectConfig;
-  if (!displayName) {
-    return undefined;
-  }
-  return displayName.name;
+  return projectConfig.displayName?.name || undefined;
 }
diff --git a/packages/jest-fake-timers/src/legacyFakeTimers.ts b/packages/jest-fake-timers/src/legacyFakeTimers.ts
index ab918f89b3c9..55d9121ed405 100644
--- a/packages/jest-fake-timers/src/legacyFakeTimers.ts
+++ b/packages/jest-fake-timers/src/legacyFakeTimers.ts
@@ -526,9 +526,8 @@ export default class FakeTimers<TimerRef> {
 
     switch (timer.type) {
       case 'timeout':
-        const callback = timer.callback;
         this._timers.delete(timerHandle);
-        callback();
+        timer.callback();
         break;
 
       case 'interval':