From ec2e0b664af1609747fb8a2e49907abdf6b8a307 Mon Sep 17 00:00:00 2001
From: Logan Smyth <loganfsmyth@gmail.com>
Date: Tue, 6 Feb 2018 22:31:48 -0800
Subject: [PATCH] Properly allow undefined ignore patterns for
 test/include/exclude.

---
 packages/babel-core/src/config/validation/option-assertions.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/babel-core/src/config/validation/option-assertions.js b/packages/babel-core/src/config/validation/option-assertions.js
index c6330e7176..97b860f016 100644
--- a/packages/babel-core/src/config/validation/option-assertions.js
+++ b/packages/babel-core/src/config/validation/option-assertions.js
@@ -140,6 +140,8 @@ export function assertConfigApplicableTest(
   key: string,
   value: mixed,
 ): ConfigApplicableTest | void {
+  if (value === undefined) return value;
+
   if (Array.isArray(value)) {
     value.forEach((item, i) => {
       if (!checkValidTest(item)) {