From b21c80634d624a8bd69d0f43f01c7a8a59e298e8 Mon Sep 17 00:00:00 2001
From: Russell Bicknell <bicknellr@google.com>
Date: Fri, 15 Jun 2018 12:14:01 -0700
Subject: [PATCH 1/2] Add a substitute for `Object.assign` for IE11.

---
 app-localize-behavior.html | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/app-localize-behavior.html b/app-localize-behavior.html
index 5072726..007364a 100644
--- a/app-localize-behavior.html
+++ b/app-localize-behavior.html
@@ -13,6 +13,17 @@
 <script src="../intl-messageformat/dist/intl-messageformat.min.js"></script>
 
 <script>
+(function() {
+
+var assign = Object.assign ? Object.assign.bind(Object) : function(destination, source) {
+  for (var prop in source) {
+    if (source.hasOwnProperty(prop)) {
+      destination[prop] = source[prop];
+    }
+  }
+
+  return destination;
+};
 
 /**
 * `Polymer.AppLocalizeBehavior` wraps the [format.js](http://formatjs.io/) library to
@@ -292,11 +303,11 @@
     var newResources = event.response;
     if (merge) {
       if (language) {
-        propertyUpdates.resources = Object.assign({}, this.resources || {});
-        propertyUpdates['resources.' + language] = Object.assign(
+        propertyUpdates.resources = assign({}, this.resources || {});
+        propertyUpdates['resources.' + language] = assign(
           propertyUpdates.resources[language] || {}, newResources);
       } else {
-        propertyUpdates.resources = Object.assign(this.resources, newResources);
+        propertyUpdates.resources = assign(this.resources, newResources);
       }
     } else {
       if (language) {
@@ -330,6 +341,7 @@
       proto['__localizationCache'] = {requests: {}, messages: {}, ajax: null};
     }
   }
-}
+};
 
+})();
 </script>

From cf1231728fbe4d1b99fac50e15877fec8847700f Mon Sep 17 00:00:00 2001
From: Russell Bicknell <bicknellr@google.com>
Date: Fri, 15 Jun 2018 12:25:12 -0700
Subject: [PATCH 2/2] Comment about `Object.assign` replacement.

---
 app-localize-behavior.html | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/app-localize-behavior.html b/app-localize-behavior.html
index 007364a..1f1a899 100644
--- a/app-localize-behavior.html
+++ b/app-localize-behavior.html
@@ -15,6 +15,8 @@
 <script>
 (function() {
 
+// This isn't a complete `Object.assign` polyfill, but this element expects
+// JSON and doesn't provide more than one source object.
 var assign = Object.assign ? Object.assign.bind(Object) : function(destination, source) {
   for (var prop in source) {
     if (source.hasOwnProperty(prop)) {