From c48dc3bb734f6fb3520dbd6608cf140b1e1b2c18 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Sun, 24 Feb 2019 16:52:51 +0100
Subject: [PATCH] set hasteImplModulePath to undefined, not null

---
 packages/jest-config/src/normalize.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/jest-config/src/normalize.ts b/packages/jest-config/src/normalize.ts
index 1ae2e08326b4..61dddcd7585c 100644
--- a/packages/jest-config/src/normalize.ts
+++ b/packages/jest-config/src/normalize.ts
@@ -646,7 +646,7 @@ export default function normalize(
         case 'haste':
           value = {...oldOptions[key]};
           if (value.hasteImplModulePath != null) {
-            value.hasteImplModulePath = resolve(newOptions.resolver, {
+            const resolvedHasteImpl = resolve(newOptions.resolver, {
               filePath: replaceRootDirInPath(
                 options.rootDir,
                 value.hasteImplModulePath,
@@ -654,6 +654,8 @@ export default function normalize(
               key: 'haste.hasteImplModulePath',
               rootDir: options.rootDir,
             });
+
+            value.hasteImplModulePath = resolvedHasteImpl || undefined;
           }
           break;
         case 'projects':