From 37e395c0e3336168fd11cdd4338e7a58d45e23c3 Mon Sep 17 00:00:00 2001
From: imxyy_soope_ <imxyy1soope1@gmail.com>
Date: Mon, 16 Feb 2026 22:31:31 +0800
Subject: [PATCH] optimize: builtins.intersectAttrs

---
 nix-js/runtime-ts/src/builtins/attrs.ts | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/nix-js/runtime-ts/src/builtins/attrs.ts b/nix-js/runtime-ts/src/builtins/attrs.ts
index 20789d1..c4eb38f 100644
--- a/nix-js/runtime-ts/src/builtins/attrs.ts
+++ b/nix-js/runtime-ts/src/builtins/attrs.ts
@@ -72,9 +72,21 @@ export const intersectAttrs =
     const f1 = forceAttrs(e1);
     const f2 = forceAttrs(e2);
     const attrs: NixAttrs = {};
-    for (const key of Object.keys(f2)) {
-      if (Object.hasOwn(f1, key)) {
-        attrs[key] = f2[key];
+    const k1 = Object.keys(f1);
+    const k2 = Object.keys(f2);
+    if (k1.length < k2.length) {
+      for (let i = 0; i < k1.length; i++) {
+        const key = k1[i];
+        if (key in f2) {
+          attrs[key] = f2[key];
+        }
+      }
+    } else {
+      for (let i = 0; i < k2.length; i++) {
+        const key = k2[i];
+        if (key in f1) {
+          attrs[key] = f2[key];
+        }
       }
     }
     return attrs;