From 71590cdc950f86c4ead9a887ad958403e043ef3b Mon Sep 17 00:00:00 2001
From: Sylvain Wallez <sylvain@elastic.co>
Date: Wed, 2 Oct 2024 14:19:50 +0200
Subject: [PATCH] GH-30863: [JS] Use a singleton StructRow proxy handler

---
 js/src/row/struct.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/js/src/row/struct.ts b/js/src/row/struct.ts
index bc3869cb8d08f..074ec91fd64b3 100644
--- a/js/src/row/struct.ts
+++ b/js/src/row/struct.ts
@@ -39,7 +39,7 @@ export class StructRow<T extends TypeMap = any> {
     constructor(parent: Data<Struct<T>>, rowIndex: number) {
         this[kParent] = parent;
         this[kRowIndex] = rowIndex;
-        return new Proxy(this, new StructRowProxyHandler());
+        return new Proxy(this, structRowProxyHandler);
     }
 
     public toArray() { return Object.values(this.toJSON()); }
@@ -157,3 +157,5 @@ class StructRowProxyHandler<T extends TypeMap = any> implements ProxyHandler<Str
         return false;
     }
 }
+
+const structRowProxyHandler = new StructRowProxyHandler();