From 52c3c143f96889ba76d95ad5f19a555be8e64c2d Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Sun, 14 Jun 2015 20:21:02 +0100
Subject: [PATCH] add BindingIdentifier virtual type

---
 src/babel/transformation/helpers/name-method.js |  7 ++-----
 src/babel/traversal/path/lib/virtual-types.js   |  7 +++++++
 src/babel/types/validators.js                   | 14 ++++++++++++++
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/babel/transformation/helpers/name-method.js b/src/babel/transformation/helpers/name-method.js
index c930c5e9f6..0057123015 100644
--- a/src/babel/transformation/helpers/name-method.js
+++ b/src/babel/transformation/helpers/name-method.js
@@ -20,11 +20,8 @@ var visitor = {
     visitIdentifier(this, node, scope, state);
   },
 
-  AssignmentExpression(node, parent, scope, state) {
-    var ids = this.getBindingIdentifiers();
-    for (var name in ids) {
-      visitIdentifier(this, ids[name], scope, state);
-    }
+  BindingIdentifier(node, parent, scope, state) {
+    visitIdentifier(this, node, scope, state);
   }
 };
 
diff --git a/src/babel/traversal/path/lib/virtual-types.js b/src/babel/traversal/path/lib/virtual-types.js
index f272c524fc..9dd60ae227 100644
--- a/src/babel/traversal/path/lib/virtual-types.js
+++ b/src/babel/traversal/path/lib/virtual-types.js
@@ -18,6 +18,13 @@ export var ReferencedIdentifier = {
   }
 };
 
+export var BindingIdentifier = {
+  types: ["Identifier"],
+  checkPath({ node, parent }, opts) {
+    return t.isBinding(node, parent);
+  }
+};
+
 export var Expression = {
   types: ["Expression"],
   checkPath(path) {
diff --git a/src/babel/types/validators.js b/src/babel/types/validators.js
index b186db335f..4fc8aa54b2 100644
--- a/src/babel/types/validators.js
+++ b/src/babel/types/validators.js
@@ -1,6 +1,20 @@
+import { getBindingIdentifiers } from "./retrievers";
 import esutils from "esutils";
 import * as t from "./index";
 
+/**
+ *
+ */
+
+export function isBinding(node: Object, parent: Object): boolean {
+  var bindingKey = getBindingIdentifiers.keys[parent.type];
+  if (bindingKey) {
+    return parent[bindingKey] === node;
+  } else {
+    return false;
+  }
+}
+
 /**
  * Check if the input `node` is a reference to a bound variable.
  */