From bab9c4d3310948b552f0dcded8a029977a249b7b Mon Sep 17 00:00:00 2001
From: Khafra <maitken033380023@gmail.com>
Date: Thu, 30 Jan 2025 14:55:18 -0500
Subject: [PATCH] events: getMaxListeners detects 0 listeners
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PR-URL: https://github.com/nodejs/node/pull/56807
Refs: https://github.com/nodejs/undici/issues/4032
Refs: https://github.com/nodejs/node/commit/c1ccade02f29fd5585601bd496d4fb615a55b682
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
---
 lib/events.js                                | 2 +-
 test/parallel/test-events-getmaxlisteners.js | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/events.js b/lib/events.js
index 50cc720b1247ba..999ee4ec746d18 100644
--- a/lib/events.js
+++ b/lib/events.js
@@ -939,7 +939,7 @@ function getEventListeners(emitterOrTarget, type) {
 function getMaxListeners(emitterOrTarget) {
   if (typeof emitterOrTarget?.getMaxListeners === 'function') {
     return _getMaxListeners(emitterOrTarget);
-  } else if (emitterOrTarget?.[kMaxEventTargetListeners]) {
+  } else if (typeof emitterOrTarget?.[kMaxEventTargetListeners] === 'number') {
     return emitterOrTarget[kMaxEventTargetListeners];
   }
 
diff --git a/test/parallel/test-events-getmaxlisteners.js b/test/parallel/test-events-getmaxlisteners.js
index 05b4e75b7218fb..a90a22a1ce1f81 100644
--- a/test/parallel/test-events-getmaxlisteners.js
+++ b/test/parallel/test-events-getmaxlisteners.js
@@ -17,3 +17,8 @@ const { getMaxListeners, EventEmitter, defaultMaxListeners, setMaxListeners } =
   setMaxListeners(101, et);
   assert.strictEqual(getMaxListeners(et), 101);
 }
+
+{
+  const ac = new AbortController();
+  assert.strictEqual(getMaxListeners(ac.signal), 0);
+}