From da0ff9158d9141551c6aab01d7442fde462d3f06 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Mon, 28 Dec 2020 20:30:22 +0100
Subject: [PATCH] fix: use advanced serialization when spawning jest workers

---
 packages/jest-runner/src/index.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/jest-runner/src/index.ts b/packages/jest-runner/src/index.ts
index acc8139e1eec..4b8f73f40b5a 100644
--- a/packages/jest-runner/src/index.ts
+++ b/packages/jest-runner/src/index.ts
@@ -166,7 +166,12 @@ export default class TestRunner {
 
     const worker = new Worker(TEST_WORKER_PATH, {
       exposedMethods: ['worker'],
-      forkOptions: {stdio: 'pipe'},
+      forkOptions: {
+        // default to advanced serialization in order to match worker threads
+        // @ts-expect-error: option does not exist on the node 10 types
+        serialization: 'advanced',
+        stdio: 'pipe',
+      },
       maxRetries: 3,
       numWorkers: this._globalConfig.maxWorkers,
       setupArgs: [