From 6fc4c15244b3b14e79de2320d831ef5bafff1d2c Mon Sep 17 00:00:00 2001
From: Dunqing <dengqing0821@gmail.com>
Date: Mon, 27 Jan 2025 10:57:24 +0800
Subject: [PATCH] perf(mangler): reserve space for tmp bindings before extend

---
 crates/oxc_mangler/src/lib.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/oxc_mangler/src/lib.rs b/crates/oxc_mangler/src/lib.rs
index 38e4e28c7f2b5..4da01e9500200 100644
--- a/crates/oxc_mangler/src/lib.rs
+++ b/crates/oxc_mangler/src/lib.rs
@@ -219,6 +219,9 @@ impl Mangler {
 
             // Sort `bindings` in declaration order.
             tmp_bindings.clear();
+            if tmp_bindings.capacity() < bindings.len() {
+                tmp_bindings.reserve(bindings.len());
+            }
             tmp_bindings.extend(bindings.values().copied());
             tmp_bindings.sort_unstable();
             for (&symbol_id, assigned_slot) in