From a4fd67e361914df612ae432ff75283c2d332ae18 Mon Sep 17 00:00:00 2001
From: adiGuba <frederic.martini@gmail.com>
Date: Tue, 14 Jul 2026 11:54:13 +0200
Subject: [PATCH] fix: $state.eager() is sometimes incorrect in SSR (#18530)

Fix #18529

A simple fix : `context.visit()` was missing on the argument of
`$state.eager()`, so the generated code can be incorrect in some case :
---
 .changeset/long-buttons-hunt.md                            | 5 +++++
 .../phases/3-transform/server/visitors/CallExpression.js   | 2 +-
 .../samples/state-eager/_expected.html                     | 2 ++
 .../server-side-rendering/samples/state-eager/main.svelte  | 7 +++++++
 4 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/long-buttons-hunt.md
 create mode 100644 packages/svelte/tests/server-side-rendering/samples/state-eager/_expected.html
 create mode 100644 packages/svelte/tests/server-side-rendering/samples/state-eager/main.svelte

diff --git a/.changeset/long-buttons-hunt.md b/.changeset/long-buttons-hunt.md
new file mode 100644
index 0000000000..68d0b60ff4
--- /dev/null
+++ b/.changeset/long-buttons-hunt.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: ensure `$state.eager()` is correctly transormed for SSR output
diff --git a/packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js b/packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js
index 8525fb6366..ac78f55da9 100644
--- a/packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js
+++ b/packages/svelte/src/compiler/phases/3-transform/server/visitors/CallExpression.js
@@ -46,7 +46,7 @@ export function CallExpression(node, context) {
 	}
 
 	if (rune === '$state.eager') {
-		return node.arguments[0];
+		return context.visit(node.arguments[0]);
 	}
 
 	if (rune === '$state.snapshot') {
diff --git a/packages/svelte/tests/server-side-rendering/samples/state-eager/_expected.html b/packages/svelte/tests/server-side-rendering/samples/state-eager/_expected.html
new file mode 100644
index 0000000000..9d3ea2f5b4
--- /dev/null
+++ b/packages/svelte/tests/server-side-rendering/samples/state-eager/_expected.html
@@ -0,0 +1,2 @@
+<div>value=0</div>
+<div>eager=0</div>
\ No newline at end of file
diff --git a/packages/svelte/tests/server-side-rendering/samples/state-eager/main.svelte b/packages/svelte/tests/server-side-rendering/samples/state-eager/main.svelte
new file mode 100644
index 0000000000..d144914f72
--- /dev/null
+++ b/packages/svelte/tests/server-side-rendering/samples/state-eager/main.svelte
@@ -0,0 +1,7 @@
+<script>
+	let props = $props();
+	const value = $derived(props.number ?? 0);
+</script>
+
+<div>value={value}</div>
+<div>eager={$state.eager(value)}</div>