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<!DOCTYPE html><html><head><title>JavaScript Environment</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="JavaScript Environment"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/releases/next/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><link rel="stylesheet" href="css/prism.css"><link rel="alternate" type="application/rss+xml" title="React Native Blog" href="https://facebook.github.io/react-native/blog/feed.xml"><link href="//cdn-images.mailchimp.com/embedcode/horizontal-slim-10_7.css" rel="stylesheet" type="text/css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><script>window.fbAsyncInit = function() {FB.init({appId:'1677033832619985',xfbml:true,version:'v2.7'});};(function(d, s, id){var js, fjs = d.getElementsByTagName(s)[0];if (d.getElementById(id)) {return;}js = d.createElement(s); js.id = id;js.src = '//connect.facebook.net/en_US/sdk.js';fjs.parentNode.insertBefore(js, fjs);}(document, 'script','facebook-jssdk'));</script><script>window.twttr=(function(d,s, id){var js,fjs=d.getElementsByTagName(s)[0],t=window.twttr||{};if(d.getElementById(id))return t;js=d.createElement(s);js.id=id;js.src='https://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js, fjs);t._e = [];t.ready = function(f) {t._e.push(f);};return t;}(document, 'script', 'twitter-wjs'));</script><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">next</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active" data-target=".nav-docs">Docs</a></li><li><a href="/react-native/support.html" class="">Help</a></li><li><a href="/react-native/blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" tabindex="0" type="text" placeholder="Search docs..."></div><ul class="nav-site nav-site-external"><li><a href="https://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-viewport"><div class="nav-docs-section"><h3>The Basics</h3><ul><li><a style="margin-left:10px;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:10px;" class="" href="docs/tutorial.html">Learn the Basics</a></li><li><a style="margin-left:10px;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:10px;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:10px;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:10px;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:10px;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:10px;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/using-a-listview.html">Using List Views</a></li><li><a style="margin-left:10px;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:10px;" class="" href="docs/more-resources.html">More Resources</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:10px;" class="" href="docs/components-and-apis.html">Components and APIs</a></li><li><a style="margin-left:10px;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li><li><a style="margin-left:10px;" class="" href="docs/navigation.html">Navigating Between Screens</a></li><li><a style="margin-left:10px;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:10px;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:10px;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:10px;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:10px;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:10px;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:10px;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li><li><a style="margin-left:10px;" class="active" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:10px;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:10px;" class="" href="docs/colors.html">Color Reference</a></li><li><a style="margin-left:10px;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-device.html">Running On Device</a></li><li><a style="margin-left:10px;" class="" href="docs/upgrading.html">Upgrading to new React Native versions</a></li><li><a style="margin-left:10px;" class="" href="docs/testing.html">Running Tests and Contributing</a></li><li><a style="margin-left:10px;" class="" href="docs/understanding-cli.html">Understanding the CLI</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:10px;" class="" href="docs/running-on-simulator-ios.html">Running On Simulator</a></li><li><a style="margin-left:10px;" class="" href="docs/communication-ios.html">Communication between native and React Native</a></li><li><a style="margin-left:10px;" class="" href="docs/building-for-apple-tv.html">Building For Apple TV</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:10px;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:10px;" class="" href="docs/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:10px;" class="" href="docs/activityindicator.html">ActivityIndicator</a></li><li><a style="margin-left:10px;" class="" href="docs/button.html">Button</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/flatlist.html">FlatList</a></li><li><a style="margin-left:10px;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:10px;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:10px;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:10px;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:10px;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:10px;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/sectionlist.html">SectionList</a></li><li><a style="margin-left:10px;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:10px;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:10px;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:10px;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:10px;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:10px;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:10px;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/virtualizedlist.html">VirtualizedList</a></li><li><a style="margin-left:10px;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>APIs</h3><ul><li><a style="margin-left:10px;" class="" href="docs/accessibilityinfo.html">AccessibilityInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/adsupportios.html">AdSupportIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:10px;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:10px;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:10px;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:10px;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:10px;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/backhandler.html">BackHandler</a></li><li><a style="margin-left:10px;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:10px;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:10px;" class="" href="docs/easing.html">Easing</a></li><li><a style="margin-left:10px;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:10px;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:10px;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:10px;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:10px;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:10px;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:10px;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:10px;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="javascript-environment"></a>JavaScript Environment <a class="hash-link" href="docs/javascript-environment.html#javascript-environment">#</a></h1><div><h2><a class="anchor" name="javascript-runtime"></a>JavaScript Runtime <a class="hash-link" href="docs/javascript-environment.html#javascript-runtime">#</a></h2><p>When using React Native, you&#x27;re going to be running your JavaScript code in two environments:</p><ul><li>On iOS simulators and devices, Android emulators and devices React Native uses <a href="http://trac.webkit.org/wiki/JavaScriptCore" target="_blank">JavaScriptCore</a> which is the JavaScript engine that powers Safari. On iOS JSC doesn&#x27;t use JIT due to the absence of writable executable memory in iOS apps.</li><li>When using Chrome debugging, it runs all the JavaScript code within Chrome itself and communicates with native code via WebSocket. So you are using <a href="https://code.google.com/p/v8/" target="_blank">V8</a>.</li></ul><p>While both environments are very similar, you may end up hitting some inconsistencies. We&#x27;re likely going to experiment with other JS engines in the future, so it&#x27;s best to avoid relying on specifics of any runtime.</p><h2><a class="anchor" name="javascript-syntax-transformers"></a>JavaScript Syntax Transformers <a class="hash-link" href="docs/javascript-environment.html#javascript-syntax-transformers">#</a></h2><p>Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.</p><p>As of version 0.5.0, React Native ships with the <a href="https://babeljs.io" target="_blank">Babel JavaScript compiler</a>. Check <a href="https://babeljs.io/docs/plugins/#transform-plugins" target="_blank">Babel documentation</a> on its supported transformations for more details.</p><p>Here&#x27;s a full list of React Native&#x27;s <a href="https://github.com/facebook/react-native/blob/master/babel-preset/configs/main.js#L16" target="_blank">enabled transformations</a>.</p><p>ES5</p><ul><li>Reserved Words: <code>promise.catch(function() { });</code></li></ul><p>ES6</p><ul><li><a href="http://babeljs.io/docs/learn-es2015/#arrows" target="_blank">Arrow functions</a>: <code>&lt;C onPress={() =&gt; this.setState({pressed: true})}</code></li><li><a href="https://babeljs.io/docs/learn-es2015/#let-const" target="_blank">Block scoping</a>: <code>let greeting = &#x27;hi&#x27;;</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#default-rest-spread" target="_blank">Call spread</a>: <code>Math.max(...array);</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#classes" target="_blank">Classes</a>: <code>class C extends React.Component { render() { return &lt;View /&gt;; } }</code></li><li><a href="https://babeljs.io/docs/learn-es2015/#let-const" target="_blank">Constants</a>: <code>const answer = 42;</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#destructuring" target="_blank">Destructuring</a>: <code>var {isActive, style} = this.props;</code></li><li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of" target="_blank">for...of</a>: <code>for (var num of [1, 2, 3]) {}</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#modules" target="_blank">Modules</a>: <code>import React, { Component } from &#x27;react&#x27;;</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals" target="_blank">Computed Properties</a>: <code>var key = &#x27;abc&#x27;; var obj = {[key]: 10};</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals" target="_blank">Object Concise Method</a>: <code>var obj = { method() { return 10; } };</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#enhanced-object-literals" target="_blank">Object Short Notation</a>: <code>var name = &#x27;vjeux&#x27;; var obj = { name };</code></li><li><a href="https://github.com/sebmarkbage/ecmascript-rest-spread" target="_blank">Rest Params</a>: <code>function(type, ...args) { }</code></li><li><a href="http://babeljs.io/docs/learn-es2015/#template-strings" target="_blank">Template Literals</a>: <code>var who = &#x27;world&#x27;; var str = `Hello ${who}`;</code></li></ul><p>ES7</p><ul><li><a href="https://github.com/sebmarkbage/ecmascript-rest-spread" target="_blank">Object Spread</a>: <code>var extended = { ...obj, a: 10 };</code></li><li><a href="https://github.com/jeffmo/es-trailing-function-commas" target="_blank">Function Trailing Comma</a>: <code>function f(a, b, c,) { }</code></li><li><a href="https://github.com/tc39/ecmascript-asyncawait" target="_blank">Async Functions</a>: <code>async function doStuffAsync() { const foo = await doOtherStuffAsync(); }</code>;</li></ul><p>Specific</p><ul><li><a href="https://facebook.github.io/react/docs/jsx-in-depth.html" target="_blank">JSX</a>: <code>&lt;View style={{color: &#x27;red&#x27;}} /&gt;</code></li><li><a href="http://flowtype.org/" target="_blank">Flow</a>: <code>function foo(x: ?number): string {}</code></li></ul><h2><a class="anchor" name="polyfills"></a>Polyfills <a class="hash-link" href="docs/javascript-environment.html#polyfills">#</a></h2><p>Many standards functions are also available on all the supported JavaScript runtimes.</p><p>Browser</p><ul><li><a href="https://developer.chrome.com/devtools/docs/console-api" target="_blank">console.{log, warn, error, info, trace, table}</a></li><li><a href="https://nodejs.org/docs/latest/api/modules.html" target="_blank">CommonJS require</a></li><li><a href="docs/network.html#content" target="_blank">XMLHttpRequest, fetch</a></li><li><a href="docs/timers.html#content" target="_blank">{set, clear}{Timeout, Interval, Immediate}, {request, cancel}AnimationFrame</a></li><li><a href="docs/geolocation.html#content" target="_blank">navigator.geolocation</a></li></ul><p>ES6</p><ul><li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign" target="_blank">Object.assign</a></li><li>String.prototype.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith" target="_blank">startsWith</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith" target="_blank">endsWith</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeats" target="_blank">repeat</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes" target="_blank">includes</a>}</li><li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from" target="_blank">Array.from</a></li><li>Array.prototype.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find" target="_blank">find</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex" target="_blank">findIndex</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes" target="_blank">includes</a>}</li></ul><p>ES7</p><ul><li>Object.{<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries" target="_blank">entries</a>, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values" target="_blank">values</a>}</li></ul><p>Specific</p><ul><li><code>__DEV__</code></li></ul></div><div class="docs-prevnext"><a class="docs-prev btn" 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