From 12104f822fceb688f9acad3cee679d1c8c6d407e Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Mon, 18 May 2015 22:44:40 +0100
Subject: [PATCH] add assignment pattern shorthand support to explode
 transformer - fixes #1566

---
 .../transformation/transformers/internal/explode.js |  9 ++++++---
 .../spec.function-name/shorthand-property/actual.js |  9 +++++++++
 .../shorthand-property/expected.js                  | 13 +++++++++++++
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/babel/transformation/transformers/internal/explode.js b/src/babel/transformation/transformers/internal/explode.js
index 374d88f022..9f11c013d8 100644
--- a/src/babel/transformation/transformers/internal/explode.js
+++ b/src/babel/transformation/transformers/internal/explode.js
@@ -5,9 +5,9 @@ export var metadata = {
   group: "builtin-setup"
 };
 
-function buildClone(bindingKey, refKey) {
+function buildClone(bindingKey, refKey, check?) {
   return function (node) {
-    if (node[bindingKey] === node[refKey]) {
+    if (node[bindingKey] === node[refKey] || (check && check(node))) {
       node[refKey] = t.removeComments(clone(node[refKey]));
     }
   };
@@ -25,6 +25,9 @@ function buildListClone(listKey, bindingKey, refKey) {
   };
 }
 
-export var Property = buildClone("value", "key");
+export var Property = buildClone("value", "key", function (node) {
+  return t.isAssignmentPattern(node.value) && node.value.left === node.key;
+});
+
 export var ExportDeclaration = buildListClone("specifiers", "local", "exported");
 export var ImportDeclaration = buildListClone("specifiers", "local", "imported");
diff --git a/test/core/fixtures/transformation/spec.function-name/shorthand-property/actual.js b/test/core/fixtures/transformation/spec.function-name/shorthand-property/actual.js
index 2c06014fa3..67ddae3d56 100644
--- a/test/core/fixtures/transformation/spec.function-name/shorthand-property/actual.js
+++ b/test/core/fixtures/transformation/spec.function-name/shorthand-property/actual.js
@@ -9,3 +9,12 @@ var bar = {
     get(arg, "baz");
   }
 };
+
+var f = function ({ foo = "bar" }) {
+  var obj = {
+    // same name as parameter
+    foo: function () {
+      foo;
+    }
+  };
+};
diff --git a/test/core/fixtures/transformation/spec.function-name/shorthand-property/expected.js b/test/core/fixtures/transformation/spec.function-name/shorthand-property/expected.js
index 374fc7c053..fd89e7bebf 100644
--- a/test/core/fixtures/transformation/spec.function-name/shorthand-property/expected.js
+++ b/test/core/fixtures/transformation/spec.function-name/shorthand-property/expected.js
@@ -11,3 +11,16 @@ var bar = {
     _get(arg, "baz");
   }
 };
+
+var f = function f(_ref) {
+  var _ref$foo = _ref.foo;
+
+  var _foo = _ref$foo === undefined ? "bar" : _ref$foo;
+
+  var obj = {
+    // same name as parameter
+    foo: function foo() {
+      _foo;
+    }
+  };
+};