[react-packager][streamline oss] Move open sourced JS source to react-native-github

Libraries/Utilities/differ/insetsDiffer.js

@@ -0,0 +1,26 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule insetsDiffer
+ */
+'use strict';
+
+var dummyInsets = {
+	top: undefined,
+	left: undefined,
+	right: undefined,
+	bottom: undefined,
+};
+
+var insetsDiffer = function(one, two) {
+  one = one || dummyInsets;
+  two = two || dummyInsets;
+  return one !== two && (
+    one.top !== two.top ||
+    one.left !== two.left ||
+    one.right !== two.right ||
+    one.bottom !== two.bottom
+  );
+};
+
+module.exports = insetsDiffer;