Add possibility to console.error/redbox on promise rejections

Summary: Adds a possibility to `console.error` / redbox if any promise is rejected.

Differential Revision: D3048130

fb-gh-sync-id: b1a44b421ec3b1f7913226c86b2a48f00f27b105
shipit-source-id: b1a44b421ec3b1f7913226c86b2a48f00f27b105

Libraries/promiseRejectionIsError.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule promiseRejectionIsError
+ * @flow
+ */
+
+require('Promise'); // make sure the default rejection handler is installed
+const rejectionTracking = require('promise/setimmediate/rejection-tracking');
+
+module.exports = () => {
+  rejectionTracking.enable({
+    allRejections: true,
+    onUnhandled: (id, error) => {
+      console.error(error);
+    },
+    onHandled: () => {},
+  });
+};