Updates from Fri 13 Mar

- [ReactNative] Oss ActionSheet | Tadeu Zagallo
- [ReactNative] Fix ScrollView.scrollTo() | Christopher Chedeau
- [catalyst|madman] fix location observer | Jiajie Zhu
- [ReactNative] Remove keyboardDismissMode from static | Christopher Chedeau
- [ReactNative] Fix RCTMapManager retaining cycle | Tadeu Zagallo
- [ReactNative] Support loading sourcemaps from sourceMappingURL | Alex Kotliarskyi
- [catalyst] set up directory specific rql transform | Bhuwan Khattar
- [React Native] Add .done() to terminate promise chains | Ben Alpert
- [React Native] add support for reading tracking bit | Owen Coutts

Libraries/JavaScriptAppEngine/Initialization/InitializeJavaScriptAppEngine.js

@@ -57,6 +57,8 @@ function setupDocumentShim() {
   }
 }
 
+var sourceMapPromise;
+
 function handleErrorWithRedBox(e) {
   var RKExceptionsManager = require('NativeModules').RKExceptionsManager;
   var errorToString = require('errorToString');
@@ -73,13 +75,14 @@ function handleErrorWithRedBox(e) {
   if (RKExceptionsManager) {
     RKExceptionsManager.reportUnhandledException(e.message, errorToString(e));
     if (__DEV__) {
-      try {
-        var sourceMapInstance = loadSourceMap();
-        var prettyStack = errorToString(e, sourceMapInstance);
-        RKExceptionsManager.updateExceptionMessage(e.message, prettyStack);
-      } catch (ee) {
-        GLOBAL.console.error('#CLOWNTOWN (error while displaying error): ' + ee.message);
-      }
+      (sourceMapPromise = sourceMapPromise || loadSourceMap())
+        .then(map => {
+          var prettyStack = errorToString(e, map);
+          RKExceptionsManager.updateExceptionMessage(e.message, prettyStack);
+        })
+        .then(null, error => {
+          GLOBAL.console.error('#CLOWNTOWN (error while displaying error): ' + error.message);
+        });
     }
   }
 }