From d102f332d7cc4aa99ff5757ebfb82012ffeda143 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Go=C5=82e=CC=A8biowski-Owczarek?=
 <m.goleb@gmail.com>
Date: Mon, 14 Apr 2025 18:45:45 +0200
Subject: [PATCH] Event: Patch jQuery.event.special's prototype

Allow to use common `Object.prototype` properties on `jQuery.event.special` but
warn as well.

Fixes gh-542
---
 src/jquery/event.js       | 11 ++++++++++-
 test/unit/jquery/event.js | 22 ++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/src/jquery/event.js b/src/jquery/event.js
index ce56591..5922994 100644
--- a/src/jquery/event.js
+++ b/src/jquery/event.js
@@ -2,9 +2,11 @@ import {
 	migrateWarn,
 	migrateWarnProp,
 	migratePatchAndInfoFunc,
-	migratePatchFunc
+	migratePatchFunc,
+	migratePatchProp
 } from "../main.js";
 import "../disablePatches.js";
+import { patchProto } from "../utils.js";
 
 var oldEventAdd = jQuery.event.add;
 
@@ -45,3 +47,10 @@ migratePatchAndInfoFunc( jQuery.fn, "hover", jQuery.fn.hover,
 
 migrateWarnProp( jQuery.event, "global", {}, "event-global",
 	"jQuery.event.global is removed" );
+
+migratePatchProp( jQuery.event, "special",
+	patchProto( jQuery.extend( Object.create( null ), jQuery.event.special ), {
+		warningId: "event-special-null-proto",
+		apiName: "jQuery.event.special"
+	} ),
+	"event-special-null-proto" );
diff --git a/test/unit/jquery/event.js b/test/unit/jquery/event.js
index e23383d..c30eaaa 100644
--- a/test/unit/jquery/event.js
+++ b/test/unit/jquery/event.js
@@ -93,3 +93,25 @@ QUnit.test( "jQuery.event.global", function( assert ) {
 		assert.deepEqual( jQuery.event.global, {}, "is an empty object" );
 	} );
 } );
+
+QUnit.test( "jQuery.event.special: properties from Object.prototype", function( assert ) {
+	assert.expect( 4 );
+
+	try {
+		expectNoMessage( assert, "Regular properties", function() {
+			jQuery.event.special.fakeevent = {};
+
+			// eslint-disable-next-line no-unused-expressions
+			jQuery.event.special.fakeevent;
+		} );
+
+		expectMessage( assert, "Properties from Object.prototype", 2, function() {
+			assert.ok( jQuery.event.special.hasOwnProperty( "fakeevent" ),
+				"hasOwnProperty works (property present)" );
+			assert.ok( !jQuery.event.special.hasOwnProperty( "fakeevent2" ),
+				"hasOwnProperty works (property missing)" );
+		} );
+	} finally {
+		delete jQuery.event.special.fakeevent;
+	}
+} );