From 6f742646450c26da7b13fe2568cd1c97ff33fe3c Mon Sep 17 00:00:00 2001
From: Vincent Lecrubier <vincent.lecrubier@gmail.com>
Date: Sun, 27 Mar 2022 17:45:42 +0100
Subject: [PATCH] Allow to customize jest transformIgnorePatterns

---
 packages/next/build/jest/jest.ts | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/packages/next/build/jest/jest.ts b/packages/next/build/jest/jest.ts
index 4af9d9afb83a7..c1dab8330c350 100644
--- a/packages/next/build/jest/jest.ts
+++ b/packages/next/build/jest/jest.ts
@@ -88,14 +88,11 @@ export default function nextJest(options: { dir?: string } = {}) {
           // Custom config will be able to override the default mappings
           ...(resolvedJestConfig.moduleNameMapper || {}),
         },
-        testPathIgnorePatterns: [
+        testPathIgnorePatterns: resolvedJestConfig.testPathIgnorePatterns || [
           // Don't look for tests in node_modules
           '/node_modules/',
           // Don't look for tests in the Next.js build output
           '/.next/',
-          // Custom config can append to testPathIgnorePatterns but not modify it
-          // This is to ensure `.next` and `node_modules` are always excluded
-          ...(resolvedJestConfig.testPathIgnorePatterns || []),
         ],
 
         transform: {