From 5fb4d84a33351c13057dc542513a3fe2309e08b0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?=
 <JLHwung@users.noreply.github.com>
Date: Thu, 1 Aug 2019 03:53:40 -0400
Subject: [PATCH] perf: always return `void 0` as undefined node (#10243)

---
 packages/babel-traverse/src/scope/index.js | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/packages/babel-traverse/src/scope/index.js b/packages/babel-traverse/src/scope/index.js
index 375d5827b9..b26b59ce18 100644
--- a/packages/babel-traverse/src/scope/index.js
+++ b/packages/babel-traverse/src/scope/index.js
@@ -490,12 +490,7 @@ export default class Scope {
   }
 
   buildUndefinedNode() {
-    if (this.hasBinding("undefined")) {
-      return t.unaryExpression("void", t.numericLiteral(0), true);
-    } else {
-      // eslint-disable-next-line @babel/development/no-undefined-identifier
-      return t.identifier("undefined");
-    }
+    return t.unaryExpression("void", t.numericLiteral(0), true);
   }
 
   registerConstantViolation(path: NodePath) {