diff --git a/packages/jest-worker/src/Farm.ts b/packages/jest-worker/src/Farm.ts
index 44344baa8e79..f6ad78524d63 100644
--- a/packages/jest-worker/src/Farm.ts
+++ b/packages/jest-worker/src/Farm.ts
@@ -50,17 +50,12 @@ export default class Farm {
     method: string,
     ...args: Array<any>
   ): PromiseWithCustomMessage<unknown> {
-    const customMessageListeners: Set<OnCustomMessage> = new Set();
+    const customMessageListeners = new Set<OnCustomMessage>();
 
     const addCustomMessageListener = (listener: OnCustomMessage) => {
       customMessageListeners.add(listener);
       return () => {
-        // Check if the following check is required
-        customMessageListeners.forEach(customListener => {
-          if (customListener === listener) {
-            customMessageListeners.delete(customListener);
-          }
-        });
+        customMessageListeners.delete(listener);
       };
     };
 
@@ -89,7 +84,11 @@ export default class Farm {
 
         const onEnd: OnEnd = (error: Error | null, result: unknown) => {
           customMessageListeners.clear();
-          return error ? reject(error) : resolve(result);
+          if (error) {
+            return reject(error);
+          } else {
+            return resolve(result);
+          }
         };
 
         const task = {onCustomMessage, onEnd, onStart, request};
diff --git a/packages/jest-worker/src/__tests__/process-integration.test.js b/packages/jest-worker/src/__tests__/process-integration.test.js
index 11e435a1f1bd..7d151cad828d 100644
--- a/packages/jest-worker/src/__tests__/process-integration.test.js
+++ b/packages/jest-worker/src/__tests__/process-integration.test.js
@@ -38,10 +38,6 @@ function assertCallsToChild(childNum, ...calls) {
   });
 }
 
-jest.mock('worker_threads', () => {
-  throw Error('Unsupported');
-});
-
 describe('Jest Worker Integration', () => {
   beforeEach(() => {
     mockForkedProcesses = [];
diff --git a/packages/jest-worker/src/index.ts b/packages/jest-worker/src/index.ts
index b8d149c3afe1..7bc79e1c736a 100644
--- a/packages/jest-worker/src/index.ts
+++ b/packages/jest-worker/src/index.ts
@@ -15,7 +15,7 @@ import type {
   WorkerPoolInterface,
   WorkerPoolOptions,
 } from './types';
-import _messageParent from './workers/messageParent';
+export {default as messageParent} from './workers/messageParent';
 
 function getExposedMethods(
   workerPath: string,
@@ -150,4 +150,3 @@ export default class JestWorker {
 }
 
 export type {PromiseWithCustomMessage};
-export const messageParent = _messageParent;
diff --git a/packages/jest-worker/src/workers/messageParent.ts b/packages/jest-worker/src/workers/messageParent.ts
index d9e768ae6734..e827c72bf0f2 100644
--- a/packages/jest-worker/src/workers/messageParent.ts
+++ b/packages/jest-worker/src/workers/messageParent.ts
@@ -5,11 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import {isMainThread, parentPort} from 'worker_threads';
 import {PARENT_MESSAGE_CUSTOM} from '../types';
 
 const isWorkerThread = () => {
   try {
-    const {isMainThread, parentPort} = require('worker_threads');
     return !isMainThread && parentPort;
   } catch {
     return false;