From 2344b4052eb80ff745b849da759b0d28d2dcaff6 Mon Sep 17 00:00:00 2001
From: ComputerGuy <63362464+Ocean-OS@users.noreply.github.com>
Date: Sun, 31 Aug 2025 02:30:46 -0700
Subject: [PATCH] fix: replace `undefined` with `void(0)` in CallExpressions
 (#16693)

* fix: replace `undefined` with `void(0)` in CallExpressions

* tweak comment
---
 .changeset/ninety-olives-report.md             | 5 +++++
 packages/svelte/src/compiler/utils/builders.js | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/ninety-olives-report.md

diff --git a/.changeset/ninety-olives-report.md b/.changeset/ninety-olives-report.md
new file mode 100644
index 0000000000..3e66a41d02
--- /dev/null
+++ b/.changeset/ninety-olives-report.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: replace `undefined` with `void(0)` in CallExpressions
diff --git a/packages/svelte/src/compiler/utils/builders.js b/packages/svelte/src/compiler/utils/builders.js
index 56a5f31ffe..03a946ff9c 100644
--- a/packages/svelte/src/compiler/utils/builders.js
+++ b/packages/svelte/src/compiler/utils/builders.js
@@ -100,7 +100,7 @@ export function call(callee, ...args) {
 	if (typeof callee === 'string') callee = id(callee);
 	args = args.slice();
 
-	// replacing missing arguments with `undefined`, unless they're at the end in which case remove them
+	// replacing missing arguments with `void(0)`, unless they're at the end in which case remove them
 	let i = args.length;
 	let popping = true;
 	while (i--) {
@@ -108,7 +108,7 @@ export function call(callee, ...args) {
 			if (popping) {
 				args.pop();
 			} else {
-				args[i] = id('undefined');
+				args[i] = void0;
 			}
 		} else {
 			popping = false;