From e985912b544372681e1ec51578accda845ca2f7a Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Mon, 9 Mar 2015 03:38:27 +1100
Subject: [PATCH] add Binary node cleanup

---
 .../transformers/internal/cleanup.js              | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/babel/transformation/transformers/internal/cleanup.js b/src/babel/transformation/transformers/internal/cleanup.js
index 3fa88bf811..c9f7ca4f97 100644
--- a/src/babel/transformation/transformers/internal/cleanup.js
+++ b/src/babel/transformation/transformers/internal/cleanup.js
@@ -13,3 +13,18 @@ export var ExpressionStatement = {
     if (!node.expression) this.remove();
   }
 };
+
+export var Binary = {
+  exit(node) {
+    var right = node.right;
+    var left  = node.left;
+
+    if (!left && !right) {
+      this.remove();
+    } else if (!left) {
+      return right;
+    } else if (!right) {
+      return left;
+    }
+  }
+};