From 248f00fe826e443825653bb906049eaeebd50c14 Mon Sep 17 00:00:00 2001
From: Ben Alpert <balpert@fb.com>
Date: Sun, 27 Dec 2015 11:13:11 -0800
Subject: [PATCH] Set function names from assignment expressions

Based on http://www.2ality.com/2015/09/function-names-es6.html.
---
 .../babel-helper-function-name/src/index.js   |  3 +++
 .../fixtures/regression/T2983/expected.js     | 20 +++++++----------
 .../function-assignment/actual.js             | 13 +++++++++++
 .../function-assignment/expected.js           | 22 +++++++++++++++++++
 4 files changed, 46 insertions(+), 12 deletions(-)
 create mode 100644 packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/actual.js
 create mode 100644 packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/expected.js

diff --git a/packages/babel-helper-function-name/src/index.js b/packages/babel-helper-function-name/src/index.js
index 05af0ac05b..ef06bb0993 100644
--- a/packages/babel-helper-function-name/src/index.js
+++ b/packages/babel-helper-function-name/src/index.js
@@ -144,6 +144,9 @@ export default function ({ node, parent, scope, id }) {
         return;
       }
     }
+  } else if (t.isAssignmentExpression(parent)) {
+    // foo = function () {};
+    id = parent.left;
   } else if (!id) {
     return;
   }
diff --git a/packages/babel-plugin-transform-class-properties/test/fixtures/regression/T2983/expected.js b/packages/babel-plugin-transform-class-properties/test/fixtures/regression/T2983/expected.js
index 12e34907ed..1ac70e7fd6 100644
--- a/packages/babel-plugin-transform-class-properties/test/fixtures/regression/T2983/expected.js
+++ b/packages/babel-plugin-transform-class-properties/test/fixtures/regression/T2983/expected.js
@@ -1,17 +1,13 @@
 var _class, _temp;
 
-call((_temp = _class = function () {
-  function _class2() {
-    babelHelpers.classCallCheck(this, _class2);
-  }
+call((_temp = _class = function _class() {
+  babelHelpers.classCallCheck(this, _class);
+}, _class.test = true, _temp));
 
-  return _class2;
-}(), _class.test = true, _temp));
-
-var _class3 = function _class3() {
-  babelHelpers.classCallCheck(this, _class3);
+var _class2 = function _class2() {
+  babelHelpers.classCallCheck(this, _class2);
 };
 
-_class3.test = true;
-export default _class3;
-;
+_class2.test = true;
+export default _class2;
+;
\ No newline at end of file
diff --git a/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/actual.js b/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/actual.js
new file mode 100644
index 0000000000..e8efb0c87a
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/actual.js
@@ -0,0 +1,13 @@
+var foo;
+foo = function() {
+};
+
+var baz;
+baz = function() {
+  baz();
+};
+baz = 12;
+
+bar = function() {
+  bar();
+};
diff --git a/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/expected.js b/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/expected.js
new file mode 100644
index 0000000000..e2084c4057
--- /dev/null
+++ b/packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/function-assignment/expected.js
@@ -0,0 +1,22 @@
+var foo;
+foo = function foo() {};
+
+var _baz;
+_baz = function baz() {
+  _baz();
+};
+_baz = 12;
+
+bar = function (_bar) {
+  function bar() {
+    return _bar.apply(this, arguments);
+  }
+
+  bar.toString = function () {
+    return _bar.toString();
+  };
+
+  return bar;
+}(function () {
+  bar();
+});
\ No newline at end of file