From 4012260c170aec9b60399eff140227e48af9607c Mon Sep 17 00:00:00 2001
From: overlookmotel <557937+overlookmotel@users.noreply.github.com>
Date: Mon, 19 Aug 2024 11:48:38 +0000
Subject: [PATCH] refactor(ast): `AstBuilder::move_identifier_reference` do not
 allocate empty string (#4977)

#4920 introduced `AstBuilder::move_identifier_reference`. Make this slightly cheaper by using a static empty `Atom` rather than relying on `"".into_in(allocator)` which allocates an empty string into arena.
---
 crates/oxc_ast/src/ast_builder_impl.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/oxc_ast/src/ast_builder_impl.rs b/crates/oxc_ast/src/ast_builder_impl.rs
index 5f6c2580f..4f4a7f030 100644
--- a/crates/oxc_ast/src/ast_builder_impl.rs
+++ b/crates/oxc_ast/src/ast_builder_impl.rs
@@ -75,7 +75,7 @@ impl<'a> AstBuilder<'a> {
         self,
         expr: &mut IdentifierReference<'a>,
     ) -> IdentifierReference<'a> {
-        let dummy = self.identifier_reference(expr.span(), "");
+        let dummy = self.identifier_reference(expr.span(), Atom::empty());
         mem::replace(expr, dummy)
     }