From 161dbe50ca5cf6ae170c72166af706121dc3b5d7 Mon Sep 17 00:00:00 2001
From: Daeyeon Jeong <daeyeon.dev@gmail.com>
Date: Sun, 15 May 2022 17:29:53 +0900
Subject: [PATCH] fixup: fix util.format on a revoked proxy

Signed-off-by: Daeyeon Jeong daeyeon.dev@gmail.com
---
 lib/internal/util/inspect.js             | 2 +-
 test/parallel/test-util-inspect-proxy.js | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
index 97ba51959d81cc..0b1a776c9cd1bb 100644
--- a/lib/internal/util/inspect.js
+++ b/lib/internal/util/inspect.js
@@ -1979,7 +1979,7 @@ function hasBuiltInToString(value) {
   }
 
   // Count objects that have no `toString` function as built-in.
-  if (typeof value.toString !== 'function') {
+  if (typeof value?.toString !== 'function') {
     return true;
   }
 
diff --git a/test/parallel/test-util-inspect-proxy.js b/test/parallel/test-util-inspect-proxy.js
index 45b8449aac2fac..30365f43f7b9a6 100644
--- a/test/parallel/test-util-inspect-proxy.js
+++ b/test/parallel/test-util-inspect-proxy.js
@@ -76,6 +76,8 @@ assert.strictEqual(
   '{ proxy: Proxy [ null, null ], revoke: [Function (anonymous)] }',
 );
 
+assert.strictEqual(util.format('%s', r.proxy), 'Proxy []');
+
 assert.strictEqual(
   util.inspect(proxyObj, opts),
   'Proxy [\n' +