From 743034fd59b5d66b1fb8ffb941da77143ae56f5d Mon Sep 17 00:00:00 2001
From: Trevor Gerhardt <trevorgerhardt@gmail.com>
Date: Thu, 15 Dec 2016 23:21:04 +0800
Subject: [PATCH 1/2] fix(babel): Loose mode breaks spread operator on Sets.
 Disable for now.

---
 lib/babel-config.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/babel-config.js b/lib/babel-config.js
index 48235fb..7acc614 100644
--- a/lib/babel-config.js
+++ b/lib/babel-config.js
@@ -13,7 +13,7 @@ module.exports = function (env) {
     presets: [
       [babelEnv, {
         targets: {browsers},
-        loose: true
+        loose: false // Loose mode breaks spread operator on `Set`s
       }],
       react,
       stage2

From e8a186adbdd7392946c1c7aaaac08baa7e695c7b Mon Sep 17 00:00:00 2001
From: Trevor Gerhardt <trevorgerhardt@gmail.com>
Date: Thu, 15 Dec 2016 23:40:33 +0800
Subject: [PATCH 2/2] test(babel): Added a test that fails in babel loose mode.

---
 lib/__tests__/babel.js | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 lib/__tests__/babel.js

diff --git a/lib/__tests__/babel.js b/lib/__tests__/babel.js
new file mode 100644
index 0000000..0699ca5
--- /dev/null
+++ b/lib/__tests__/babel.js
@@ -0,0 +1,11 @@
+/* globals describe, expect, it */
+
+describe('babel', () => {
+  /** As of 2016-12-15 this test fails in babel loose mode. https://github.com/babel/babel/issues/4916 */
+  it('should iterate correctly over a set after using the spread operator', () => {
+    const originalArr = [1, 1, 2]
+    const set = new Set(originalArr)
+    const arr = [...set]
+    expect(arr.length).toBe(2)
+  })
+})