From 6e21e8283f8006745173479d32ac99d9864aeadf Mon Sep 17 00:00:00 2001
From: Benjamin Gruenbaum <benjamingr@gmail.com>
Date: Mon, 2 Nov 2020 22:40:00 +0200
Subject: [PATCH] events: define event handler as enumerable

PR-URL: https://github.com/nodejs/node/pull/35931
Backport-PR-URL: https://github.com/nodejs/node/pull/38386
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
---
 lib/internal/event_target.js      | 4 +++-
 test/parallel/test-eventtarget.js | 7 +++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/internal/event_target.js b/lib/internal/event_target.js
index a82d9e7a4e6cf9..5f84ffbccf449d 100644
--- a/lib/internal/event_target.js
+++ b/lib/internal/event_target.js
@@ -591,7 +591,9 @@ function defineEventHandler(emitter, name) {
         emitter.addEventListener(name, value);
       }
       eventHandlerValue = value;
-    }
+    },
+    configurable: true,
+    enumerable: true
   });
 }
 module.exports = {
diff --git a/test/parallel/test-eventtarget.js b/test/parallel/test-eventtarget.js
index accacb8a328c03..96d755a8f32fe2 100644
--- a/test/parallel/test-eventtarget.js
+++ b/test/parallel/test-eventtarget.js
@@ -517,3 +517,10 @@ let asyncTest = Promise.resolve();
   }));
   target.dispatchEvent(new Event('foo'));
 }
+{
+  const target = new EventTarget();
+  defineEventHandler(target, 'foo');
+  const descriptor = Object.getOwnPropertyDescriptor(target, 'onfoo');
+  strictEqual(descriptor.configurable, true);
+  strictEqual(descriptor.enumerable, true);
+}