From 5d4e61e09f615b2f0138bf8c7be733b9fdb3d1e8 Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Thu, 31 Jul 2025 01:50:13 -0700
Subject: [PATCH] fix: nullify `last_propagated_event` to avoid memory leak

---
 .changeset/purple-hairs-glow.md                            | 5 +++++
 packages/svelte/src/internal/client/dom/elements/events.js | 2 ++
 2 files changed, 7 insertions(+)
 create mode 100644 .changeset/purple-hairs-glow.md

diff --git a/.changeset/purple-hairs-glow.md b/.changeset/purple-hairs-glow.md
new file mode 100644
index 0000000000..c2ba4ba7fb
--- /dev/null
+++ b/.changeset/purple-hairs-glow.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: nullify `last_propagated_event` to avoid memory leak
diff --git a/packages/svelte/src/internal/client/dom/elements/events.js b/packages/svelte/src/internal/client/dom/elements/events.js
index 19bd1cfa18..997cd71efa 100644
--- a/packages/svelte/src/internal/client/dom/elements/events.js
+++ b/packages/svelte/src/internal/client/dom/elements/events.js
@@ -146,6 +146,7 @@ export function delegate(events) {
 // If the event object is GCed too early, the expando __root property
 // set on the event object is lost, causing the event delegation
 // to process the event twice
+/** @type {Event | null} */
 let last_propagated_event = null;
 
 /**
@@ -182,6 +183,7 @@ export function handle_event_propagation(event) {
 			// chain in case someone manually dispatches the same event object again.
 			// @ts-expect-error
 			event.__root = handler_element;
+			last_propagated_event = null;
 			return;
 		}