From 0870ee1f9fde74f79065d1fc9e027412bc91cd8a Mon Sep 17 00:00:00 2001
From: lucab <98086+lucab@users.noreply.github.com>
Date: Mon, 29 Jul 2024 16:45:39 +0000
Subject: [PATCH] perf(parser): get and check lookahead token (#4534)

---
 crates/oxc_parser/src/lexer/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/oxc_parser/src/lexer/mod.rs b/crates/oxc_parser/src/lexer/mod.rs
index fedfb1320..cebd47f11 100644
--- a/crates/oxc_parser/src/lexer/mod.rs
+++ b/crates/oxc_parser/src/lexer/mod.rs
@@ -170,8 +170,8 @@ impl<'a> Lexer<'a> {
         let n = n as usize;
         debug_assert!(n > 0);
 
-        if self.lookahead.len() > n - 1 {
-            return self.lookahead[n - 1].token;
+        if let Some(lookahead) = self.lookahead.get(n - 1) {
+            return lookahead.token;
         }
 
         let position = self.source.position();