From 68ca0ac33c0790b3636630b37d41d18ea429aa3f Mon Sep 17 00:00:00 2001
From: Stephen Wade <stephen@stephenwade.me>
Date: Thu, 5 Aug 2021 17:03:21 -0400
Subject: [PATCH] f

---
 lib/linter/linter.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/linter/linter.js b/lib/linter/linter.js
index e67574599bbe..12bf717d96ad 100644
--- a/lib/linter/linter.js
+++ b/lib/linter/linter.js
@@ -1306,7 +1306,7 @@ class Linter {
         const text = ensureText(textOrSourceCode);
         const preprocess = options.preprocess || (rawText => [rawText]);
 
-        const postprocess = options.postprocess || Array.prototype.flat.call;
+        const postprocess = options.postprocess || (messagesList => messagesList.flat());
         const filterCodeBlock =
             options.filterCodeBlock ||
             (blockFilename => blockFilename.endsWith(".js"));