From d53a0c4e9f8c4f4b4428e823fca5aca2acc4921c Mon Sep 17 00:00:00 2001
From: Haled Odat <8566042+HalidOdat@users.noreply.github.com>
Date: Wed, 4 Oct 2023 16:32:41 +0200
Subject: [PATCH] Don't create parameter expressions environment if not used

---
 boa_engine/src/bytecompiler/declarations.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/boa_engine/src/bytecompiler/declarations.rs b/boa_engine/src/bytecompiler/declarations.rs
index 5cd18ed18c3..747b1296b4f 100644
--- a/boa_engine/src/bytecompiler/declarations.rs
+++ b/boa_engine/src/bytecompiler/declarations.rs
@@ -932,8 +932,11 @@ impl ByteCompiler<'_, '_> {
             // c. Let env be NewDeclarativeEnvironment(calleeEnv).
             // d. Assert: The VariableEnvironment of calleeContext is calleeEnv.
             // e. Set the LexicalEnvironment of calleeContext to env.
-            let _ = self.push_compile_environment(false);
-            additional_env = true;
+
+            if self.can_optimize_local_variables {
+                let _ = self.push_compile_environment(false);
+                additional_env = true;
+            }
         }
 
         // 22. If argumentsObjectNeeded is true, then