From 9c0a31feeb780099e63a9f12ce2d7c4c535935e3 Mon Sep 17 00:00:00 2001
From: raythurnvoid <53383860+raythurnvoid@users.noreply.github.com>
Date: Wed, 4 Jun 2025 02:30:57 +0100
Subject: [PATCH] Add comment to prevent further regressions

---
 packages/svelte/src/internal/client/runtime.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 4c6996db39..efc5b6a1d7 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -834,6 +834,9 @@ export function flushSync(fn) {
 		}
 
 		while (true) {
+			// is_flushing cannot be set to `true` before `flush_tasks` because it
+			// causes the regression at #16076, this can only be observed
+			// in browser and not in jsdom
 			flush_tasks();
 
 			if (queued_root_effects.length === 0) {