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A framework for building native applications using React

Home Page: https://reactnative.dev

License: MIT License

Objective-C 9.40% JavaScript 16.86% Shell 0.40% HTML 0.01% Ruby 2.85% C 0.37% Objective-C++ 11.88% Java 24.00% C++ 27.68% Assembly 0.11% CMake 0.61% Kotlin 5.25% TypeScript 0.57% Swift 0.01%
android app-framework cross-platform ios mobile mobile-development react react-native

react-native's Issues

npm start fails with `FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)`

Running OS X 10.10.1
The npm install worked fine, but I can't seem to get npm start to work. It fails with a long stream of identical errors:

2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)
2015-02-02 10:56 node[24294] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-21)

More info on environment:

$ npm --version
1.3.14

$ node --version
v0.10.22

Seems like it might be a lower level node issue (nodejs/node-v0.x-archive#5463) though a cursory search indicates that there may be workarounds it in the app (e.g. maybe there are ways to reduce the number of files being watched?).

Native Wrapping - Geolocation API Spike

I've been messing around in my fork to try and understand the JS->Obj-C bridge, and the process for wrapping native code. I've wrapped CoreLocation in the WC3 Geolocation API as a first attempt.

I figured it would be great to get a bit of feedback on it, and some others might find it useful. It would be great if I could help document the process. I've got absolutely no Obj-C experience, so not sure if this is terrible or not.

Pull Request: JoeStanton#1

unrecognized selector `setReactTag`

I'm trying to integrate this into an existing project. I successfully did this with a project generated from a template from XCode, so not sure what's going on.

I added ReactKit, linked with it, and started the packager server pointing to my JS directory. The app compiles fine, but when it runs it throws an exception: "[RCTRootView setReactTag:] unrecognized selector instance sent to instance". The thing is, when I look at RCTRootView, I don't see that method implemented anywhere, but it does have self.reactTag = ... in the setUp method. See the screenshot.

Any help debugging what I'm doing wrong?

screen shot 2015-02-01 at 10 12 26 pm

EDIT: also, the only thing I added in my didFinishLaunchingWithOptions method was RCTRootView *rootView = [[RCTRootView alloc] initWithFrame:vc.view.bounds];, which triggers this.

Guidance for talking publically

I'm due to do a introductory React talk this Wednesday evening - I expect I'll get a few questions about the React Native announcement.

I can point to the two keynote videos and talk broadly about the concepts behind it, and obviously I wont be handing out copies of the code - but am I allowed to show a little demo myself?

I don't mind either way, but wanted to make sure I'm not over-sharing.

Padding at the top of a list view

I'm rendering a ListView and it has padding at the top that I can't get rid of:

screen shot 2015-02-05 at 1 43 05 pm

My code:

    return ListView({
      style: { flex: 1, borderWidth: 1, borderColor: 'red', paddingTop: 0 },
      renderRow: this.renderRow,
      dataSource: source
    });

Anyone else seen this?

Can NavigatorIOS notify that a "back" happened?

Not sure if I'm missing something, but does NavigatorIOS have a way of notifying its owner that there is a new top route because the "<" back button was pressed? Otherwise, to get that functionality, the removed component would have to itself notify during componentWillUnmount, and that just feels weird.

How do I use superagent from react-native?

Superagent fails trying to require() what I presume to be Node modules, such as tty.

Is React Native supposed to be browserish or nodeish environment from third-party package point of view? Should React Native expose Node modules like events?

Maintaining project outside react-native repo

All the project files are now present inside the react-native directory. This allows to build the package from the server packager.js.

Is there any option to move the app to a different directory ? Something like,

$ node ./packager/packager --source '/path/to/project/'

Are flexbox animations from JS possible?

I'm writing another blog post about the theoretical possibility of applying React Native to the browser, running JS in a worker and using an asm.js-powered renderer on the main thread. (let's just assume that we can do text measurement and ignore a bunch of other big problems). I have an abstract question.

I know React Native handles animations, but I must be missing it in the source. I see InteractionManager which lets you schedule code to be run after animations are completed. But what is actually applying the animation?

Are we able to animate elements of a flexbox? Say we animated the width of an element from 50 to 100. If we did that, other elements with flex: 1 would need to re-adjust. Since we do the flexbox layout in the JS side (right?) we would need to perform the animation on the JS side. But that's not possible is it? Wouldn't they prone to all sorts of jank, not even from talking over the bridge but even GC stuff?

Of course native animations are supported, but I'm wondering about transitions with the flexbox layout system.

Auto-refresh simulator

Is it possible to have the simulator automatically refresh when a file is changed instead of Cmd-R?

:active pseudo-class

I have a list view that uses TouchableHighlight for each item. I'd like to be able to customize the styles of the underlay that is active when I touch an item. Right now the only thing possible is underlayColor. What are the chances we could something like an :active pseudo-class?

In fact, how do you do pseudo-classes when you do CSS in JS anyway?

Pattern for interacting with the main thread

I exported a function on my controller:

- (void)loadMesh:(NSString *)path {
    RCT_EXPORT();
    node.mesh = [REMeshCache meshNamed:path];
}

This is called when selecting an item from a list:

var controller = require('NativeModules').TeapotController;

// ....

selectModel: function(file) {
  controller.loadMesh(file);
},

I've been trying to debug why OpenGL crashes, and I finally realized that my OpenGL context doesn't exist. Which made me realize that this method in Obj-C is not running on the main thread. It's running in a different thread which all calls into Obj-C seem to run on.

I'm not familiar with iOS, so this is over my head. Is there a simple pattern I can use to interact with the main thread? How do I send a message to it?

I realize this not usually needed, and most custom native modules can probably be run standalone, but I'm basically implementing a custom view that needs to render on the main thread (not technically true, just a custom controller to a normal view, but still).

Carousel component

Was wondering if there was a Carousel component you guys had internally and were planning on exposing. Need it for my Weather app.

[ScrollView] Scrolling ends prematurely in ScrollViews embedded in a parent ScrollView

You can see this behavior in the UIExplorer app's <ScrollView> example. Fling to initiate a scroll in an inner ScrollView and fling again (before scrolling ends) to increase scroll momentum. Often times, this causes the scrolling to stop.

I haven't had gone through all of the ResponderEventPlugin code yet, but I'm seeing that when ResponderEventPlugin.extractEvents is called, the topLevelTargetID is sometimes incorrect.

The touches that unintentionally stop scrolling appear to be associated with the parent ScrollView instead of the inner ScrollView's content. I traced this down to RTCScrollView._shouldDisableScrollInteraction where [self isDescendantOfView:JSResponder] is sometimes YES. Forcing it to always return NO fixes the issue, but I'm pretty sure that's not the intention of this method :)

Open-sourcing

I'm sure you all have talked about this a lot, but I would like to see this open-sourced sooner rather than later. I appreciate wanting to do something for the conf attendees, and that is pretty cool, but the longer this is open-sourced the more the rest of the community will feel excluded (as more and more tweets & posts are made, etc).

I have a blog post I'm working on, for example, but I'm not going to post it until this is open-sourced because otherwise I feel like I'm rubbing my early access in other's faces.

react-native CLI?

Should react-native be exposed as a CLI after installing react-native as a module?

npm install react-native --save
react-native server // could start the development server
react-native bundle // could build a bundle for delivery to app store

`pthread.h` not found

To build on my machine (OS X 10.9.3) targeting iOS SDK 7.1 (only one available on my machine), I had to change line 7 in /ReactKit/Modules/RCTUIManager.m from #import <pthread/pthread.h> to #import <pthread.h> to get it to compile.

Using Native Popovers/Modals

I'm now trying to wrap the native Image Picker (UIImagePickerController), which is working. I'm wondering though, what is the recommended way to push and pop views on and off the screen?

My current code:

@implementation RCTPhotoManagerDelegate
  - (void) show:(RCTResponseSenderBlock)callback {
      self.done = callback;
      _picker = [[UIImagePickerController alloc] init];
      _picker.modalPresentationStyle = UIModalPresentationCurrentContext;
      _picker.delegate = self;
      _picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
      dispatch_async(dispatch_get_main_queue(), ^{
          UIViewController *root = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
          [root presentViewController:_picker animated:YES completion:nil];
      });
  }

   - (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
       self.done(@[[NSString stringWithFormat:@"%@", [info valueForKey: @"UIImagePickerControllerReferenceURL"]]]);
       [self dismissViewControllerAnimated:YES completion:nil];
   }
@end

Currently my popover doesn't actually dismiss, and I feel like this might mess up the React rendering. Is this a bad way to do it?

border top/left/bottom/right width not working

I have this in my render method:

    return View(
      { style: { flex: 1 } },
      TouchableWithoutFeedback(
        { onPress: this.handlePress },
        View({
          style: {
            flex: 0,
            backgroundColor: 'gray',
            height: 50,
            alignItems: 'center',
            justifyContent: 'center',
            borderWidth: 1,
            borderColor: 'white'
          },
        }, Text({ style: { color: 'white' }}, "^"))
      ),
      TouchableWithoutFeedback(
        { onPress: this.handlePress },
        View({
          style: {
            flex: 0,
            backgroundColor: 'gray',
            height: 50,
            alignItems: 'center',
            justifyContent: 'center'
          },
        }, Text({ style: { color: 'white' }}, "v"))
      )
    )

It renders this:

screen shot 2015-02-02 at 9 43 33 am

But if I change the borderWidth in the first component to borderBottomWidth or any of the other top/left/bottom/right methods, there is no border. There should be a white border on one side of the component:

screen shot 2015-02-02 at 9 43 40 am

Support for Camera Roll

A comment in the image component references support for local assets that are part of the bundle, but also other places such as the camera roll.

* images from local disk, such as the camera roll. Example usage:

Does this mean I can feed in URL's of the scheme assets-library://, or is this not supported? As the component currently reports that the image is not found. If it isn't, would I need to implement it in RCTConvert similarly to Gif support?

eg.

  <Image style={styles.icon} source={ix('assets-library://asset/asset.JPG?id=x&ext=JPG')}  />

Does even bubbling exist, or how to enable cancelsTouchesInView ?

I don't see a stopPropagation method on the Event instance we get in a touch handler. Is there a way to do the equivalent of setting cancelsTouchesInView = YES on a view so that touch events do not go to parent views?

We probably don't need something like stopPropagation because you can't really do that on iOS, but some static property to set on a View.

What are the guidelines for exposing native APIs?

This is not an issue per se, but something that #4 got me thinking about.

There are often many ways to expose the same native API. How opinionated does React Native want to be? For example, Xamarin mirrors all available iOS SDK but has a very specific and consistent API guidelines document that explains how native Cocoa APIs are mapped to be C#-friendly. This means that, if you know how certain API is called in Objective C, you can more or less infer what it will be in Xamarin's world without consulting the docs.

With React Native, this gets even more interesting because we may need both imperative platform-bridging API (like proposed StatusBarIOS.setStyle) as well as declarative React components sitting on top of such APIs, for example NavigatorIOS.

Are there any guidelines we want to establish for such components? Are we just trying to make the best declarative wrappers possible for every platform's native APIs? How fast are we willing to make breaking changes to them? (Unlike React, we have a lot of public API here.)

I'm sorry if this is premature talk but I'd love to get some sense of the direction of this project.

How do I run the packager for a new project?

I created a brand new project, added the required files for ReactKit, and got all that working. Now I just need to run the packager. In packager/packager.js I see:

if (!options.projectRoot) {
  options.projectRoot = path.resolve(__dirname, '..');
}

But options is parsed from the command line arguments and I don't see the projectRoot command line arg. How do I run it, setting the path to my new project?

I temporarily fixed it by hardcoding the projectRoot to my project in there. A side issue: I was surprised to find that the bundler didn't seem to load files from that node_modules where I ran the packager (the error was pretty obscure). I needed to copy the node_modules directory into my new project also.

Watcher took too long to load error message

I followed the instructions in the readme but when I run npm start I get this error message:

[Error: Watcher took too long to load.]
Error: Watcher took too long to load.
at null._onTimeout (/Users/mrscobbler/Projects/react-native/packager/react-packager/src/FileWatcher/index.js:37:16)
at Timer.listOnTimeout as ontimeout

ERROR: could not create packager - please shut down any existing instances that are already running.

I don't think I have any other existing instances running (as far as I know). I installed Watchman. When I run which watchman I see this: /usr/local/bin/watchman

Any ideas on what could be wrong?

ScrollView onScroll only fires once

I have a component that looks something like this:

var ScrollTest = React.createClass({

  render() {
    return (
      <ScrollView onScroll={this.onScroll}>
        <View style={{ height: 2000 }} />
      </ScrollView>
    );
  },

  onScroll: function(e) {
    console.log("Scroll", e)
  }
});

Right now I'm only seeing the log message when I start a new scroll action. Is there a way to get that onScroll event to fire on every frame? I want the height of another component to depend on the scroll position of this ScrollView component. (trying to duplicate the behavior you see on the iOS Weather app when you scroll down).

Provide more descriptive error message when source file is not found

I required wrong file by mistake and got this message:

screen shot 2015-01-30 at 23 56 23

The actual message was obscured in Xcode console:

Error: 
 stack: 
ModuleError@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:105:23
require@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:202:28
http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:28141:33
require@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:243:30
http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:27651:26
require@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:243:30
http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:946:27
require@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:243:30
applyWithGuard@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:871:25
require@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:194:39
global code@http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle:28295:9
 URL: http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle
 line: 202
 message: Requiring unknown module "./test/actions/RepoActionCreators". It may not be loaded yet. Did you forget to run arc build?"

It would be nice to display the actual error.

[Orientation] Re-Layout on orientation change

How should I re-layout the page when the orientation of the device changes? I noticed none of the demo apps seem to support this yet. If I refresh the app in a different orientation it lays out fine though.

NavigatorIOS: Accessing onRightButtonPress from within child component

I'm creating a TodoList example app using Flux. Right now I have three components: TodoListApp, TodoItems and AddItem. TodoListApp is simply a NavigatorIOS component which shows TodoItems by default and a method to push the AddItem page to the navigator stack when the user taps the '+' button.

My question is: is there a way for my AddItem component (child of NavigatorIOS) to handle the onRightButtonPress event? Right now I've had to put in a bunch of hacks to accommodate adding a todo item when the user taps the 'Save' button from the AddItem page.

How does calling from JS to Obj-C work?

I added a method to my TeapotController object:

- (void)touchHappened {
  RCT_EXPORT();
  NSLog(@"happened");
  CC3Vector pos = teapotNode_.position;
  [teapotNode_ setSizeX: 10];
  [teapotNode_ invalidateGlobalTransformMatrix];
}

Looking through the source, it looks like I can add RCT_EXPORT to export a method. I can then call it like this:

var controller = require('NativeModules').TeapotController;
controller.touchHappened();

If I just log something in touchHappened, this works. But when I try to access an instance variable like teapotNode_, nothing happens... but I don't see how this works anyway. How is it exporting a method from an instance? What I have multiple instances of TeapotController? I don't see how I could require individual instances.

Set UIStatusBarStyleLightContent

Is it possible to set the status bar to light? I'm working on a dark background.

Also, is this the right place to ask questions like this?

Support webpack-dev-server

I want to implement support for Webpack dev server.

This is essential to my workflow as I rely on transforms such as 6to5. I also want to integrate Hot Module Replacement to React Native so that updates without losing component state or unmounting are possible.

Where should I start looking?

npm start fails with "Watcher took too long to load"

When I run npm start, it fails indicating a timeout. (This is on a circa-2011 Mac laptop.)

Mike-Fikess-MacBook-Pro:react-native mfikes$ npm start

> [email protected] start /Users/mfikes/Documents/Projects/react-native
> ./packager/packager.sh


 ===============================================================
 |  Running packager on port 8081.       
 |  Keep this packager running while developing on any JS         
 |  projects. Feel free to close this tab and run your own      
 |  packager instance if you prefer.                              
 |                                                              
 |     https://github.com/facebook/react-native                 
 |                                                              
 ===============================================================


React packager ready.

[Error: Watcher took too long to load.]
Error: Watcher took too long to load.
    at null._onTimeout (/Users/mfikes/Documents/Projects/react-native/packager/react-packager/src/FileWatcher/index.js:37:16)
    at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)

  >>> ERROR: could not create packager - please shut down any existing instances that are already running.

I've rebooted just to be sure nothing else is running.

To rule out a race, I've increased the MAX_WAIT_TIME on line 21 of react-native/packager/react-packager/src/FileWatcher/index.js to as much as 2 minutes, but this doesn't resolve the issue.

I've installed node and watchman via brew:

Mike-Fikess-MacBook-Pro:~ mfikes$ brew list
node        pcre        watchman

and I'm running the latest version of OS X:

Mike-Fikess-MacBook-Pro:~ mfikes$ uname -a
Darwin Mike-Fikess-MacBook-Pro.local 14.1.0 Darwin Kernel Version 14.1.0: Mon Dec 22 23:10:38 PST 2014; root:xnu-2782.10.72~2/RELEASE_X86_64 x86_64

I have all of this running successfully on another machine, so this will probably boil down to finding out what the critical difference between the two is.

React.js + React Native: Abstracting platform differences away

Are there any plans on abstracting platform differences away?

For React.js I use React.findDOMNode, but also offsetLeft, offsetWidth, etc. Obviously these won't work inside React Native - so I was wondering if this is just how things are, or if there is some plan for abstracting this away?

npm start -> Cannot call method 'forEach' of undefined

OS: OS X 10.10.2
npm v2.5.0
node v0.10.36
commit hash: 3e59937 (after 2015-02-09 updates)
npm global and project modules updated to the latest


Error description

When starting packager I get the following error.

$ npm start

> [email protected] start /Users/grgur/Projects/sdk/react-native
> ./packager/packager.sh


 ===============================================================
 |  Running packager on port 8081.       
 |  Keep this packager running while developing on any JS         
 |  projects. Feel free to close this tab and run your own      
 |  packager instance if you prefer.                              
 |                                                              
 |     https://github.com/facebook/react-native                 
 |                                                              
 ===============================================================

[TypeError: Cannot call method 'forEach' of undefined]
TypeError: Cannot call method 'forEach' of undefined
    at new Packager (/Users/grgur/Projects/sdk/react-native/packager/react-packager/src/Packager/index.js:49:30)
    at new Server (/Users/grgur/Projects/sdk/react-native/packager/react-packager/src/Server/index.js:13:20)
    at Object.exports.middleware (/Users/grgur/Projects/sdk/react-native/packager/react-packager/index.js:7:16)
    at getAppMiddleware (/Users/grgur/Projects/sdk/react-native/packager/packager.js:82:24)
    at runServer (/Users/grgur/Projects/sdk/react-native/packager/packager.js:101:10)
    at Object.<anonymous> (/Users/grgur/Projects/sdk/react-native/packager/packager.js:54:1)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)

  >>> ERROR: could not create packager - please shut down any existing instances that are already running.

The error points to

function Packager(projectConfig) {
  projectConfig.projectRoots.forEach(verifyRootExists);

Rolling back to d29d07e results in a successful start

Support require.resolve

Currently not supported, which makes it hard for me to support both React.js and React Native inside my library.

What components are coming?

I'd like to implement an existing IOS component inside React Native, but would prefer to pick something that isn't already implemented by Facebook. Would be great if you guys could clarify the future plans of React Native a bit more, so we could also help out :-).

React packager failing - SyntaxError: Unexpected end of input

Unfortunately I am having issues with getting the movies example app working :-(

I have installed watchman as per the instructions, and already had node v0.10.36 installed.

On running npm start all seems well. However when I load the movies example it fails.

Testing via the URL:

http://localhost:8081/Examples/Movies/MoviesApp.includeRequire.runModule.bundle

Yields the following error:

{"type":"InternalError","message":"React packager has encountered an internal error, please check your terminal error output for more details"}

And here is the terminal output:

$ npm start

> [email protected] start /Users/colineberhardt/Projects/react-native
> ./packager/packager.sh


 ===============================================================
 |  Running packager on port 8081.       
 |  Keep this packager running while developing on any JS         
 |  projects. Feel free to close this tab and run your own      
 |  packager instance if you prefer.                              
 |                                                              
 |     https://github.com/facebook/react-native                 
 |                                                              
 ===============================================================


React packager ready.

SyntaxError: Unexpected end of input
    at Object.parse (native)
    at /Users/colineberhardt/Projects/react-native/packager/react-packager/src/DependencyResolver/haste/DependencyGraph/index.js:270:32
    at _fulfilled (/Users/colineberhardt/Projects/react-native/node_modules/q/q.js:787:54)
    at self.promiseDispatch.done (/Users/colineberhardt/Projects/react-native/node_modules/q/q.js:816:30)
    at Promise.promise.promiseDispatch (/Users/colineberhardt/Projects/react-native/node_modules/q/q.js:749:13)
    at /Users/colineberhardt/Projects/react-native/node_modules/q/q.js:557:44
    at flush (/Users/colineberhardt/Projects/react-native/node_modules/q/q.js:108:17)
    at process._tickCallback (node.js:442:13)
[17:52:41] <START> find dependencies

I've had a poke around DependencyGraph and tried to add some logging but haven't made much progress.

Has anyone else ecountered (and maybe solved!) this issue?

Add response headers to XMLHttpRequest

I'm trying to get superagent working for #10 but it seems XMLHttpRequest does not support response headers. getAllResponseHeaders() is currently just a stub and there is no implementation of getResponseHeader.

CocoaPod spec

CocoaPods is like npm for iOS and OS X. It keeps your dependencies up-to-date and sets up the Xcode workspace file so you don't have to manually drag ReactKit into the Movies project, for example. It probably makes sense to publish a CocoaPod for the public release.

There are a couple steps in this process. One thing that needs to be figured out is how to deploy the JS files under Libraries. Usually a CocoaPod will include Obj-C along with resource files inside of a bundle, but ReactKit's packager wants to bundle up both the core library files with the application JS (side note: worth thinking about changing this so apps don't need to load all the JS at boot). The right setup might be to split the project into three parts: ReactKit's native code (fetched via CocoaPods), ReactKit's core JS libraries (via npm), and react-kit-tools (packager, etc, fetched via npm). The workflow would look like:

pod try ReactKit
npm install react-kit react-kit-tools
npm start
# done!

Looking to get feedback on the overall idea or the specifics, especially because it affects both adoption of ReactKit and touches FB's syncing between the public and private repos.

WatchKit?

Is it possible to run React Native on WatchKit?

[Bridge] Pass __fbBatchedBridgeConfig into the bundle instead of making it global

This is to reduce globals and encourage scoping. A specific approach I have in mind is to make the bundle produce a function that takes the bridge config as an argument:

(function(batchedBridgeConfig) {
// current bundle code here
});
// source map stuff

And when setting up ReactKit:

// get the js context from the executor -- API for this needs to be thought out
[[context evaluateScript:bundleScriptString] invokeWithArguments:@[configObject]]

Then the global goes away and you don't need -[RCTJavaScriptExecutor injectJSONText:asGlobalObjectNamed:callback:] either!

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