Updated docs for 0.42

docs/debugging.html

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-<!DOCTYPE html><html><head><title>Debugging</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="Debugging"><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/"><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="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">0.42</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/showcase.html" class="">Showcase</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:0;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:0;" class="" href="docs/tutorial.html">Tutorial</a></li><li><a style="margin-left:0;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:0;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:0;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:0;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-listview.html">Using a ListView</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:0;" class="" href="docs/using-navigators.html">Using Navigators</a></li><li><a style="margin-left:0;" 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:0;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li><li><a style="margin-left:0;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:0;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:0;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:0;" class="" href="docs/accessibility.html">Accessibility</a></li><li><aLine truncated
+<!DOCTYPE html><html><head><title>Debugging</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="Debugging"><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/"><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="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">0.42</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/showcase.html" class="">Showcase</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:0;" class="" href="docs/getting-started.html">Getting Started</a></li><li><a style="margin-left:0;" class="" href="docs/tutorial.html">Tutorial</a></li><li><a style="margin-left:0;" class="" href="docs/props.html">Props</a></li><li><a style="margin-left:0;" class="" href="docs/state.html">State</a></li><li><a style="margin-left:0;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:0;" class="" href="docs/height-and-width.html">Height and Width</a></li><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Layout with Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/handling-text-input.html">Handling Text Input</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-scrollview.html">Using a ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/using-a-listview.html">Using a ListView</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Networking</a></li><li><a style="margin-left:0;" 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:0;" class="" href="docs/integration-with-existing-apps.html">Integration With Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li><li><a style="margin-left:0;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:0;" class="" href="docs/handling-touches.html">Handling Touches</a></li><li><a style="margin-left:0;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:0;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:Line truncated
 $ react<span class="token operator">-</span>native log<span class="token operator">-</span>android</div><p>You may also access these through <code>Debug → Open System Log...</code> in the iOS Simulator or by running <code>adb logcat *:S ReactNative:V ReactNativeJS:V</code> in a terminal while an Android app is running on a device or emulator.</p><h2><a class="anchor" name="chrome-developer-tools"></a>Chrome Developer Tools <a class="hash-link" href="docs/debugging.html#chrome-developer-tools">#</a></h2><p>To debug the JavaScript code in Chrome, select &quot;Debug JS Remotely&quot; from the Developer Menu. This will open a new tab at <a href="http://localhost:8081/debugger-ui" target="_blank"><a href="http://localhost:8081/debugger-ui">http://localhost:8081/debugger-ui</a></a>.</p><p>Select <code>Tools → Developer Tools</code> from the Chrome Menu to open the <a href="https://developer.chrome.com/devtools" target="_blank">Developer Tools</a>. You may also access the DevTools using keyboard shortcuts (<strong><code>Command</code></strong><code>⌘</code> + <strong><code>Option</code></strong><code>⌥</code> + <strong><code>I</code></strong> on Mac, <strong><code>Ctrl</code></strong> + <strong><code>Shift</code></strong> + <strong><code>I</code></strong> on Windows). You may also want to enable <a href="http://stackoverflow.com/questions/2233339/javascript-is-there-a-way-to-get-chrome-to-break-on-all-errors/17324511#17324511" target="_blank">Pause On Caught Exceptions</a> for a better debugging experience.</p><blockquote><p>It is <a href="https://github.com/facebook/react-devtools/issues/229" target="_blank">currently not possible</a> to use the &quot;React&quot; tab in the Chrome Developer Tools to inspect app widgets. You can use Nuclide&#x27;s &quot;React Native Inspector&quot; as a workaround.</p></blockquote><h3><a class="anchor" name="debugging-on-a-device-with-chrome-developer-tools"></a>Debugging on a device with Chrome Developer Tools <a class="hash-link" href="docs/debugging.html#debugging-on-a-device-with-chrome-developer-tools">#</a></h3><p>On iOS devices, open the file <a href="https://github.com/facebook/react-native/blob/master/Libraries/WebSocket/RCTWebSocketExecutor.m" target="_blank"><code>RCTWebSocketExecutor.m</code></a> and change &quot;localhost&quot; to the IP address of your computer, then select &quot;Debug JS Remotely&quot; from the Developer Menu.</p><p>On Android 5.0+ devices connected via USB, you can use the <a href="http://developer.android.com/tools/help/adb.html" target="_blank"><code>adb</code> command line tool</a> to setup port forwarding from the device to your computer:</p><p><code>adb reverse tcp:8081 tcp:8081</code></p><p>Alternatively, select &quot;Dev Settings&quot; from the Developer Menu, then update the &quot;Debug server host for device&quot; setting to match the IP address of your computer.</p><blockquote><p>If you run into any issues, it may be possible that one of your Chrome extensions is interacting in unexpected ways with the debugger. Try disabling all of your extensions and re-enabling them one-by-one until you find the problematic extension.</p></blockquote><h3><a class="anchor" name="debugging-using-a-custom-javascript-debugger"></a>Debugging using a custom JavaScript debugger <a class="hash-link" href="docs/debugging.html#debugging-using-a-custom-javascript-debugger">#</a></h3><p>To use a custom JavaScript debugger in place of Chrome Developer Tools, set the <code>REACT_DEBUGGER</code> environment variable to a command that will start your custom debugger. You can then select &quot;Debug JS Remotely&quot; from the Developer Menu to start debugging.</p><p>The debugger will receive a list of all project roots, separated by a space. For example, if you set <code>REACT_DEBUGGER=&quot;node /path/to/launchDebugger.js --port 2345 --type ReactNative&quot;</code>, then the command <code>node /path/to/launchDebugger.js --port 2345 --type ReactNative /path/to/reactNative/app</code> will be used to start your debugger.</p><blockquote><p>Custom debugger commands executed this way should be short-lived processes, and they shouldn&#x27;t produce more than 200 kilobytes of output.</p></blockquote><h3><a class="anchor" name="debugging-with-stetho-http-facebook-github-io-stetho-on-android"></a>Debugging with <a href="http://facebook.github.io/stetho/" target="_blank">Stetho</a> on Android <a class="hash-link" href="docs/debugging.html#debugging-with-stetho-http-facebook-github-io-stetho-on-android">#</a></h3><ol><li><p>In <code>android/app/build.gradle</code>, add these lines in the <code>dependencies</code> section:</p><div class="prism language-javascript">compile <span class="token string">&#x27;com.facebook.stetho:stetho:1.3.1&#x27;</span>
 compile <span class="token string">&#x27;com.facebook.stetho:stetho-okhttp3:1.3.1&#x27;</span></div></li><li><p>In <code>android/app/src/main/java/com/{yourAppName}/MainApplication.java</code>, add the following imports:</p><div class="prism language-javascript">import com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>react<span class="token punctuation">.</span>modules<span class="token punctuation">.</span>network<span class="token punctuation">.</span>ReactCookieJarContainer<span class="token punctuation">;</span>
 import com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>stetho<span class="token punctuation">.</span>Stetho<span class="token punctuation">;</span>