[React Native] Bring back console.error redboxes with disable flag

Libraries/Utilities/stringifySafe.js

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2015-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 stringifySafe
+ * @flow
+ */
+'use strict';
+
+/**
+ * Tries to stringify with JSON.stringify and toString, but catches exceptions
+ * (e.g. from circular objects) and always returns a string and never throws.
+ */
+function stringifySafe(arg: any): string {
+  var ret;
+  if (arg === undefined) {
+    ret = 'undefined';
+  } else if (arg === null) {
+    ret = 'null';
+  } else if (typeof arg === 'string') {
+    ret = '"' + arg + '"';
+  } else {
+    // Perform a try catch, just in case the object has a circular
+    // reference or stringify throws for some other reason.
+    try {
+      ret = JSON.stringify(arg);
+    } catch (e) {
+      if (typeof arg.toString === 'function') {
+        try {
+          ret = arg.toString();
+        } catch (E) {}
+      }
+    }
+  }
+  return ret || '["' + typeof arg + '" failed to stringify]';
+}
+
+module.exports = stringifySafe;