From 05ade5a0a89c7c3339b017150128fe4d2991de2a Mon Sep 17 00:00:00 2001
From: Mike Lambert <mlambert@gmail.com>
Date: Mon, 19 Sep 2016 19:16:02 -0400
Subject: [PATCH] Allow Promise to display error strings and not just error
 objects.

---
 Libraries/Promise.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Libraries/Promise.js b/Libraries/Promise.js
index 7b52e135cc33f9..6fea6d0c38cd2e 100644
--- a/Libraries/Promise.js
+++ b/Libraries/Promise.js
@@ -18,6 +18,9 @@ if (__DEV__) {
     allRejections: true,
     onUnhandled: (id, error = {}) => {
       const {message = null, stack = null} = error;
+      if (typeof error === 'string' || error instanceof String) {
+        message = error;
+      }
       const warning =
         `Possible Unhandled Promise Rejection (id: ${id}):\n` +
         (message == null ? '' : `${message}\n`) +