diff --git a/docs/next/pushnotificationios.html b/docs/next/pushnotificationios.html
index 87572504bce..9cff9c2e0f8 100644
--- a/docs/next/pushnotificationios.html
+++ b/docs/next/pushnotificationios.html
@@ -164,6 +164,7 @@
 <li><a href="/react-native/docs/next/pushnotificationios#getcontentavailable"><code>getContentAvailable</code></a></li>
 <li><a href="/react-native/docs/next/pushnotificationios#getbadgecount"><code>getBadgeCount</code></a></li>
 <li><a href="/react-native/docs/next/pushnotificationios#getdata"><code>getData</code></a></li>
+<li><a href="/react-native/docs/next/pushnotificationios#getThreadID"><code>getThreadID</code></a></li>
 </ul>
 <hr>
 <h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
@@ -458,6 +459,11 @@
 <pre><code class="hljs css language-javascript"><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <p>Gets the data object on the notification</p>
+<hr>
+<h3><a class="anchor" aria-hidden="true" id="getthreadid"></a><a href="#getthreadid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getThreadID()</code></h3>
+<pre><code class="hljs css language-javascript"><span class="token function">getThreadID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+</code></pre>
+<p>Gets the thread ID on the notification</p>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/pixelratio"><span class="arrow-prev">← </span><span class="function-name-prevnext">PixelRatio</span></a><a class="docs-next button" href="/react-native/docs/next/settings"><span>Settings</span><span class="arrow-next"> →</span></a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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><script>
                 document.addEventListener('keyup', function(e) {
diff --git a/docs/next/pushnotificationios/index.html b/docs/next/pushnotificationios/index.html
index 87572504bce..9cff9c2e0f8 100644
--- a/docs/next/pushnotificationios/index.html
+++ b/docs/next/pushnotificationios/index.html
@@ -164,6 +164,7 @@
 <li><a href="/react-native/docs/next/pushnotificationios#getcontentavailable"><code>getContentAvailable</code></a></li>
 <li><a href="/react-native/docs/next/pushnotificationios#getbadgecount"><code>getBadgeCount</code></a></li>
 <li><a href="/react-native/docs/next/pushnotificationios#getdata"><code>getData</code></a></li>
+<li><a href="/react-native/docs/next/pushnotificationios#getThreadID"><code>getThreadID</code></a></li>
 </ul>
 <hr>
 <h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
@@ -458,6 +459,11 @@
 <pre><code class="hljs css language-javascript"><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <p>Gets the data object on the notification</p>
+<hr>
+<h3><a class="anchor" aria-hidden="true" id="getthreadid"></a><a href="#getthreadid" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>getThreadID()</code></h3>
+<pre><code class="hljs css language-javascript"><span class="token function">getThreadID</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+</code></pre>
+<p>Gets the thread ID on the notification</p>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/pixelratio"><span class="arrow-prev">← </span><span class="function-name-prevnext">PixelRatio</span></a><a class="docs-next button" href="/react-native/docs/next/settings"><span>Settings</span><span class="arrow-next"> →</span></a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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><script>
                 document.addEventListener('keyup', function(e) {
diff --git a/docs/next/stylesheet.html b/docs/next/stylesheet.html
index 0eeba428358..2cb44ba4edd 100644
--- a/docs/next/stylesheet.html
+++ b/docs/next/stylesheet.html
@@ -102,11 +102,13 @@
 <li><a href="/react-native/docs/next/stylesheet#setstyleattributepreprocessor"><code>setStyleAttributePreprocessor</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#create"><code>create</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#flatten"><code>flatten</code></a></li>
+<li><a href="/react-native/docs/next/stylesheet#compose"><code>compose</code></a></li>
 </ul>
 <h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
 <ul>
 <li><a href="/react-native/docs/next/stylesheet#hairlinewidth"><code>hairlineWidth</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#absolutefill"><code>absoluteFill</code></a></li>
+<li><a href="/react-native/docs/next/stylesheet#absoluteFillObject"><code>absoluteFillObject</code></a></li>
 </ul>
 <hr>
 <h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
@@ -161,8 +163,14 @@ StyleSheet<span class="token punctuation">.</span><span class="token function">f
 <span class="token comment">// Simply styles.listItem would return its ID (number)</span>
 </code></pre>
 <p>This method internally uses <code>StyleSheetRegistry.getStyleByID(style)</code> to resolve style objects represented by IDs. Thus, an array of style objects (instances of <code>StyleSheet.create()</code>), are individually resolved to, their respective objects, merged as one and then returned. This also explains the alternative use.</p>
+<hr>
+<h3><a class="anchor" aria-hidden="true" id="compose"></a><a href="#compose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>compose</code></h3>
+<p>Combines two styles such that <code>style2</code> will override any styles in <code>style1</code>. If either style is falsy, the other one is returned without allocating an array, saving allocations and maintaining reference equality for PureComponent checks.</p>
+<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">compose</span><span class="token punctuation">(</span>style<span class="token punctuation">)</span>
+</code></pre>
 <h2><a class="anchor" aria-hidden="true" id="properties-1"></a><a href="#properties-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h2>
 <h3><a class="anchor" aria-hidden="true" id="hairlinewidth"></a><a href="#hairlinewidth" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>hairlineWidth</code></h3>
+<p>This is defined as the width of a thin line on the platform. It can be used as the thickness of a border or division between two elements. Example:</p>
 <pre><code class="hljs css language-javascript"><span class="token keyword">var</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
   separator<span class="token punctuation">:</span> <span class="token punctuation">{</span>
     borderBottomColor<span class="token punctuation">:</span> <span class="token string">'#bbb'</span><span class="token punctuation">,</span>
@@ -184,6 +192,17 @@ StyleSheet<span class="token punctuation">.</span><span class="token function">f
 <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <hr>
+<h3><a class="anchor" aria-hidden="true" id="absolutefillobject"></a><a href="#absolutefillobject" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>absoluteFillObject</code></h3>
+<p>Sometimes you may want <code>absoluteFill</code> but with a couple tweaks - <code>absoluteFillObject</code> can be used to create a customized entry in a <code>StyleSheet</code>, e.g.:</p>
+<pre><code class="hljs css language-javascript"><span class="token keyword">const</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
+  wrapper<span class="token punctuation">:</span> <span class="token punctuation">{</span>
+    <span class="token operator">...</span>StyleSheet<span class="token punctuation">.</span>absoluteFill<span class="token punctuation">,</span>
+    top<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span>
+    backgroundColor<span class="token punctuation">:</span> <span class="token string">'transparent'</span><span class="token punctuation">,</span>
+  <span class="token punctuation">}</span><span class="token punctuation">,</span>
+<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+</code></pre>
+<hr>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/statusbarios"><span class="arrow-prev">← </span><span class="function-name-prevnext">StatusBarIOS</span></a><a class="docs-next button" href="/react-native/docs/next/systrace"><span>Systrace</span><span class="arrow-next"> →</span></a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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'));
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diff --git a/docs/next/stylesheet/index.html b/docs/next/stylesheet/index.html
index 0eeba428358..2cb44ba4edd 100644
--- a/docs/next/stylesheet/index.html
+++ b/docs/next/stylesheet/index.html
@@ -102,11 +102,13 @@
 <li><a href="/react-native/docs/next/stylesheet#setstyleattributepreprocessor"><code>setStyleAttributePreprocessor</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#create"><code>create</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#flatten"><code>flatten</code></a></li>
+<li><a href="/react-native/docs/next/stylesheet#compose"><code>compose</code></a></li>
 </ul>
 <h3><a class="anchor" aria-hidden="true" id="properties"></a><a href="#properties" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h3>
 <ul>
 <li><a href="/react-native/docs/next/stylesheet#hairlinewidth"><code>hairlineWidth</code></a></li>
 <li><a href="/react-native/docs/next/stylesheet#absolutefill"><code>absoluteFill</code></a></li>
+<li><a href="/react-native/docs/next/stylesheet#absoluteFillObject"><code>absoluteFillObject</code></a></li>
 </ul>
 <hr>
 <h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
@@ -161,8 +163,14 @@ StyleSheet<span class="token punctuation">.</span><span class="token function">f
 <span class="token comment">// Simply styles.listItem would return its ID (number)</span>
 </code></pre>
 <p>This method internally uses <code>StyleSheetRegistry.getStyleByID(style)</code> to resolve style objects represented by IDs. Thus, an array of style objects (instances of <code>StyleSheet.create()</code>), are individually resolved to, their respective objects, merged as one and then returned. This also explains the alternative use.</p>
+<hr>
+<h3><a class="anchor" aria-hidden="true" id="compose"></a><a href="#compose" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>compose</code></h3>
+<p>Combines two styles such that <code>style2</code> will override any styles in <code>style1</code>. If either style is falsy, the other one is returned without allocating an array, saving allocations and maintaining reference equality for PureComponent checks.</p>
+<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">compose</span><span class="token punctuation">(</span>style<span class="token punctuation">)</span>
+</code></pre>
 <h2><a class="anchor" aria-hidden="true" id="properties-1"></a><a href="#properties-1" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Properties</h2>
 <h3><a class="anchor" aria-hidden="true" id="hairlinewidth"></a><a href="#hairlinewidth" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>hairlineWidth</code></h3>
+<p>This is defined as the width of a thin line on the platform. It can be used as the thickness of a border or division between two elements. Example:</p>
 <pre><code class="hljs css language-javascript"><span class="token keyword">var</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
   separator<span class="token punctuation">:</span> <span class="token punctuation">{</span>
     borderBottomColor<span class="token punctuation">:</span> <span class="token string">'#bbb'</span><span class="token punctuation">,</span>
@@ -184,6 +192,17 @@ StyleSheet<span class="token punctuation">.</span><span class="token function">f
 <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <hr>
+<h3><a class="anchor" aria-hidden="true" id="absolutefillobject"></a><a href="#absolutefillobject" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>absoluteFillObject</code></h3>
+<p>Sometimes you may want <code>absoluteFill</code> but with a couple tweaks - <code>absoluteFillObject</code> can be used to create a customized entry in a <code>StyleSheet</code>, e.g.:</p>
+<pre><code class="hljs css language-javascript"><span class="token keyword">const</span> styles <span class="token operator">=</span> StyleSheet<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
+  wrapper<span class="token punctuation">:</span> <span class="token punctuation">{</span>
+    <span class="token operator">...</span>StyleSheet<span class="token punctuation">.</span>absoluteFill<span class="token punctuation">,</span>
+    top<span class="token punctuation">:</span> <span class="token number">10</span><span class="token punctuation">,</span>
+    backgroundColor<span class="token punctuation">:</span> <span class="token string">'transparent'</span><span class="token punctuation">,</span>
+  <span class="token punctuation">}</span><span class="token punctuation">,</span>
+<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+</code></pre>
+<hr>
 </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/react-native/docs/next/statusbarios"><span class="arrow-prev">← </span><span class="function-name-prevnext">StatusBarIOS</span></a><a class="docs-next button" href="/react-native/docs/next/systrace"><span>Systrace</span><span class="arrow-next"> →</span></a></div></div></div></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/react-native/" class="nav-home"><img src="/react-native/img/header_logo.png" alt="React Native" width="66" height="58"/></a><div><h5><a href="/react-native/docs/getting-started.html">Docs</a></h5><a href="/react-native/docs/getting-started.html">Getting Started</a><a href="/react-native/docs/tutorial.html">Tutorial</a><a href="/react-native/docs/components-and-apis.html">Components and APIs</a><a href="/react-native/docs/more-resources.html">More Resources</a></div><div><h5>Community</h5><a href="/react-native/help.html">The React Native Community</a><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Ask Questions on Stack Overflow</a><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md">Contributor Guide</a></div><div><h5>More Resources</h5><a href="/react-native/blog/">Blog</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://reactjs.org" target="_blank">React</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="/react-native/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2019 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><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'));
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