React.js is a popular JavaScript library for building reusable UI components. React Native takes all the great features of React, from the one-way binding and virtual DOM to debugging tools, and applies them to mobile app development on iOS and Android.

With the React Native Universal Windows platform extension, you can now make your React Native applications run on the Universal Windows families of devices, including desktop, mobile, and Xbox, as well as Windows IoT, Surface Hub, and HoloLens.

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In this code story, we will walk through the process of setting up a Universal Windows project for React Native, importing core Windows-specific modules to your JavaScript components, and running the app with Visual Studio.

Installing React Native For Windows

Installing the React Native Universal Windows platform extension is easy, whether you want to add the Windows platform to your existing app, or you want to start from scratch building an app just for Windows.

Adding React Native for Windows to Existing Projects

React Native developers may be familiar with , a tool initially built to simplify the process of adding native dependencies to React Native projects. RNPM has a great plugin architecture upon which the React Native for Windows command line tools were built.

To start, make sure you have RNPM installed globally.

npm install -g rnpm

Once RNPM is installed, install the Windows plugin for RNPM and initialize your project.

npm install --save-dev rnpm-plugin-windows
rnpm windows

The windows command will do the following:

• Install react-native-windows from NPM,
• Read the name of your project from package.json,

The RNPM plugin architecture searches your local package.json dependencies and devDependencies for modules that match rnpm-plugin-*, hence the –save-dev above.

Head to GitHub for more information on rnpm-plugin-windows.

Creating a React Native for Windows Project from Scratch

You have a few different options to create a React Native Universal Windows project from scratch. If your eventual intent is to also build apps for iOS and Android in the same code base, then the recommendation is to first use the existing tutorial to set up your React Native project, and then follow the steps above. E.g.,

<code=“language-bash”>npm install -g react-native-cli
react-native init myapp

Note: the react-native-windows NPM package is only compatible with the latest versions of react-native, from version 0.27 onwards.

Otherwise, you can easily set yourself up with npm init.

mkdir myapp
cd myapp
npm init
npm install --save-dev rnpm-plugin-windows
rnpm windows

Note: the default behavior for choosing the version of react-native-windows is to install the latest version if the package.json does not yet have a react-native dependency. Otherwise, if a react-native dependency already exists, the plugin will attempt to install a version of react-native-windows that matches the major and minor version of react-native.

The Windows plugin for RNPM will automatically install the react-native and react peer dependencies for react-native-windows if they have not yet been installed.

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import {
  TabBarIOS,
  DrawerLayoutAndroid
} from ‘react-native’;

Since Windows is a plugin to the framework, core modules specific to Windows are imported from react-native-windows, i.e.:

import {
  FlipViewWindows,
  SplitViewWindows
} from ‘react-native-windows’;

import React, { Component } from ‘react’;
import {
  AppRegistry,
  StyleSheet,
  Text,
  View
} from ‘react-native’;
import {
  SplitViewWindows
} from ‘react-native-windows’;

import React, {Component} from ‘react’;
import {
  Platform,
  Text,
  View
} from ‘react-native’;

class HelloComponent extends Component {
  render() {
    var text = “Hello world!”;
    if (Platform.OS === ‘android’) {
      text = “Hello Android!”;
    } else if (Platform.OS === ‘windows’) {
      text = “Hello Windows!”;
    }

<span class="k">return</span> <span class="p">(</span>
  <span class="o">&lt;</span><span class="nx">View</span><span class="o">&gt;</span>
    <span class="o">&lt;</span><span class="nx">Text</span><span class="o">&gt;</span><span class="p">{</span><span class="nx">text</span><span class="p">}</span><span class="o">&lt;</span><span class="sr">/text</span><span class="err">&gt;

      </View>

    );

  }

}


Facebook has a very good article on cross-platform design with React Native at . 
Running The Universal Windows App
 There are a few options for running your React Native Universal Windows app. The easiest way, for now, is to launch the app in Visual Studio. After initializing the project, open the Visual Studio solution at ./windows/myapp.sln in Visual Studio 2015 (Community edition is supported). From Visual Studio, choose which platform you want to build for (x86, x64, or ARM), choose the target you want to deploy to, and press F5. We are still working on deployment from the command line, but work to enable a run-windows command to the RNPM plugin is underway. 
The instructions for running React Native UWP apps, both from Visual Studio and from the CLI, will be evolving on GitHub. If you have any problems getting started with building or running your React Windows application, reach out on Discord or open an issue. We look forward to hearing your feedback and reviewing your contributions! 
More Hands-On With Web And Mobile Apps
 Check out these helpful resources on building web and Mobile Apps: For further updates on the topic and new features, please view the original documentation. 

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