From 60669b99c831071fe93629a3d4d37a471eab8023 Mon Sep 17 00:00:00 2001
From: Brad Zacher <brad.zacher@gmail.com>
Date: Fri, 27 Mar 2020 18:17:09 -0700
Subject: [PATCH] fix(eslint-plugin): [no-unsafe-return] error with <TS3.7

---
 packages/eslint-plugin/src/util/types.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/eslint-plugin/src/util/types.ts b/packages/eslint-plugin/src/util/types.ts
index 924c68e151d..f602a1e6a27 100644
--- a/packages/eslint-plugin/src/util/types.ts
+++ b/packages/eslint-plugin/src/util/types.ts
@@ -323,7 +323,12 @@ export function isAnyOrAnyArrayTypeDiscriminated(
   }
   if (
     checker.isArrayType(type) &&
-    isTypeAnyType(checker.getTypeArguments(type)[0])
+    isTypeAnyType(
+      // getTypeArguments was only added in TS3.7
+      checker.getTypeArguments
+        ? checker.getTypeArguments(type)[0]
+        : (type.typeArguments ?? [])[0],
+    )
   ) {
     return AnyType.AnyArray;
   }