From 88a6aa0d89d445f5018cf18850de86fa22365e00 Mon Sep 17 00:00:00 2001
From: Simon Holthausen <simon.holthausen@vercel.com>
Date: Thu, 12 Mar 2026 11:14:39 +0100
Subject: [PATCH] fix state.eager/effect.pending

---
 .../svelte/src/internal/client/reactivity/batch.js    | 11 ++++++++---
 .../samples/async-state-eager/_config.js              |  4 ++--
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/packages/svelte/src/internal/client/reactivity/batch.js b/packages/svelte/src/internal/client/reactivity/batch.js
index 7bed61eb7b..1e4a3b36fe 100644
--- a/packages/svelte/src/internal/client/reactivity/batch.js
+++ b/packages/svelte/src/internal/client/reactivity/batch.js
@@ -179,10 +179,12 @@ export class Batch {
 
 	is_fork = false;
 
+	eager = false;
+
 	#decrement_queued = false;
 
 	#is_deferred() {
-		return this.is_fork || this.#blocking_pending > 0;
+		return !this.eager && (this.is_fork || this.#blocking_pending > 0);
 	}
 
 	/** @returns {boolean} */
@@ -260,8 +262,6 @@ export class Batch {
 		 */
 		var updates = (legacy_updates = []);
 
-		if (this.id === 5) debugger;
-
 		for (const root of roots) {
 			this.#traverse(root, effects, render_effects);
 		}
@@ -692,6 +692,9 @@ export class Batch {
 		// from = Batch.find(from);
 		to = Batch.find(to);
 		if (from === to) return;
+		if (from.is_fork || to.is_fork || (from.eager && !to.eager) || (to.eager && !from.eager)) {
+			return from;
+		}
 
 		for (const [source, value] of from.previous) {
 			if (!to.previous.has(source)) {
@@ -1120,6 +1123,8 @@ let eager_versions = [];
 function eager_flush() {
 	try {
 		flushSync(() => {
+			var batch = Batch.ensure();
+			batch.eager = true;
 			for (const version of eager_versions) {
 				update(version);
 			}
diff --git a/packages/svelte/tests/runtime-runes/samples/async-state-eager/_config.js b/packages/svelte/tests/runtime-runes/samples/async-state-eager/_config.js
index f84228ec14..4031086e41 100644
--- a/packages/svelte/tests/runtime-runes/samples/async-state-eager/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/async-state-eager/_config.js
@@ -23,11 +23,11 @@ export default test({
 
 		shift.click();
 		await tick();
-		assert.htmlEqual(target.innerHTML, `<button>3</button><button>shift</button><p>1</p>`);
+		assert.htmlEqual(target.innerHTML, `<button>3</button><button>shift</button><p>0</p>`);
 
 		shift.click();
 		await tick();
-		assert.htmlEqual(target.innerHTML, `<button>3</button><button>shift</button><p>2</p>`);
+		assert.htmlEqual(target.innerHTML, `<button>3</button><button>shift</button><p>0</p>`);
 
 		shift.click();
 		await tick();