react-native-web/docs/guides/rendering.md

Client and Server rendering

It's recommended that you use a module loader that supports package aliases (e.g., webpack), and alias react-native to react-native-web.

// webpack.config.js

module.exports = {
  // ...other configuration
  resolve: {
    alias: {
      'react-native': 'react-native-web'
    }
  }
}

The react-native-web package also includes a core module that exports only ReactNative, Image, StyleSheet, Text, TextInput, and View.

// webpack.config.js

module.exports = {
  // ...other configuration
  resolve: {
    alias: {
      'react-native': 'react-native-web/core'
    }
  }
}

Client-side rendering

Rendering without using the AppRegistry:

import React from 'react'
import ReactNative from 'react-native'

// component that renders the app
const AppHeaderContainer = (props) => { /* ... */ }

ReactNative.render(<AppHeaderContainer />, document.getElementById('react-app-header'))

Rendering using the AppRegistry:

import React from 'react'
import ReactNative, { AppRegistry } from 'react-native'

// component that renders the app
const AppContainer = (props) => { /* ... */ }

// register the app
AppRegistry.registerComponent('App', () => AppContainer)

AppRegistry.runApplication('App', {
  initialProps: {},
  rootTag: document.getElementById('react-app')
})

// prerender the app
const { html, styleElement } = AppRegistry.prerenderApplication('App', { initialProps })

Server-side rendering

Rendering using the AppRegistry:

import ReactDOMServer from 'react-dom/server'
import ReactNative, { AppRegistry } from 'react-native'

// component that renders the app
const AppContainer = (props) => { /* ... */ }

// register the app
AppRegistry.registerComponent('App', () => AppContainer)

// prerender the app
const { element, stylesheet } = AppRegistry.getApplication('App', { initialProps });
const initialHTML = ReactDOMServer.renderToString(element);