From 444f24ad82b469bfd9fc3e440f5f417e9b95c64f Mon Sep 17 00:00:00 2001
From: Boshen <boshenc@gmail.com>
Date: Fri, 30 Oct 2026 17:17:31 +0800
Subject: [PATCH] perf(ecmascript): short-circuit simple parameter checks for
 rest (#28503)

Return immediately for rest parameters before scanning the ordinary
parameters.

AI-assisted (Codex).
---
 crates/oxc_ecmascript/src/is_simple_parameter_list.rs | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/crates/oxc_ecmascript/src/is_simple_parameter_list.rs b/crates/oxc_ecmascript/src/is_simple_parameter_list.rs
index 5d8954f7fe..5c890bb170 100644
--- a/crates/oxc_ecmascript/src/is_simple_parameter_list.rs
+++ b/crates/oxc_ecmascript/src/is_simple_parameter_list.rs
@@ -7,9 +7,10 @@ pub trait IsSimpleParameterList {
 
 impl IsSimpleParameterList for FormalParameters<'_> {
     fn is_simple_parameter_list(&self) -> bool {
-        self.items
-            .iter()
-            .all(|pat| pat.pattern.is_binding_identifier() && pat.initializer.is_none())
-            && self.rest.is_none()
+        self.rest.is_none()
+            && self
+                .items
+                .iter()
+                .all(|pat| pat.pattern.is_binding_identifier() && pat.initializer.is_none())
     }
 }