fix: replace undefined with void(0) in CallExpressions (#16693)

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

* tweak comment

Author: Ocean-OS

.changeset/ninety-olives-report.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: replace `undefined` with `void(0)` in CallExpressions

packages/svelte/src/compiler/utils/builders.js

@@ -100,15 +100,15 @@ 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--) {
 		if (!args[i]) {
 			if (popping) {
 				args.pop();
 			} else {
-				args[i] = id('undefined');
+				args[i] = void0;
 			}
 		} else {
 			popping = false;