From 032757a6e5e48518775bb307f982d56b7c7bde57 Mon Sep 17 00:00:00 2001
From: Alex Bass <alexbassy@users.noreply.github.com>
Date: Thu, 8 Mar 2018 22:26:00 +0100
Subject: [PATCH] Stop worker being redefined and breaking Jest #1635 (#1695)

---
 lib/index.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/index.js b/lib/index.js
index 0458588e..b8350fe1 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -122,7 +122,9 @@ require('./extensions')(realmConstructor);
 if (realmConstructor.Sync) {
     if (getContext() === 'nodejs') {
       nodeRequire('./notifier')(realmConstructor);
-      Object.defineProperty(realmConstructor, 'Worker', {value: nodeRequire('./worker')});
+      if (!realmConstructor.Worker) {
+          Object.defineProperty(realmConstructor, 'Worker', {value: nodeRequire('./worker')});
+      }
     }
 }