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docs/next/native-modules-ios.html

@@ -254,6 +254,14 @@ RCTRootView *rootView = [[RCTRootView alloc]
 <pre><code class="hljs css language-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>CalendarManager<span class="token punctuation">.</span>firstDayOfTheWeek<span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <p>Note that the constants are exported only at initialization time, so if you change <code>constantsToExport</code> values at runtime it won't affect the JavaScript environment.</p>
+<h3><a class="anchor" aria-hidden="true" id="implementing-requiresmainqueuesetup"></a><a href="#implementing-requiresmainqueuesetup" 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>Implementing <code>+ requiresMainQueueSetup</code></h3>
+<p>If you override <code>- constantsToExport</code> then you should also implement <code>+ requiresMainQueueSetup</code> to let React Native know if your module needs to be initialized on the main thread. Otherwise you will see a warning that in the future your module may be initialized on a background thread unless you explicitly opt out with <code>+ requiresMainQueueSetup</code>:</p>
+<pre><code class="hljs css language-objectivec">+ (<span class="hljs-built_in">BOOL</span>)requiresMainQueueSetup
+{
+  <span class="hljs-keyword">return</span> <span class="hljs-literal">YES</span>;  <span class="hljs-comment">// only do this if your module initialization relies on calling UIKit!</span>
+}
+</code></pre>
+<p>If your module does not require access to UIKit, then you should respond to <code>+ requiresMainQueueSetup</code> with <code>NO</code>.</p>
 <h3><a class="anchor" aria-hidden="true" id="enum-constants"></a><a href="#enum-constants" 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>Enum Constants</h3>
 <p>Enums that are defined via <code>NS_ENUM</code> cannot be used as method arguments without first extending RCTConvert.</p>
 <p>In order to export the following <code>NS_ENUM</code> definition:</p>

docs/next/native-modules-ios/index.html

@@ -254,6 +254,14 @@ RCTRootView *rootView = [[RCTRootView alloc]
 <pre><code class="hljs css language-javascript">console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>CalendarManager<span class="token punctuation">.</span>firstDayOfTheWeek<span class="token punctuation">)</span><span class="token punctuation">;</span>
 </code></pre>
 <p>Note that the constants are exported only at initialization time, so if you change <code>constantsToExport</code> values at runtime it won't affect the JavaScript environment.</p>
+<h3><a class="anchor" aria-hidden="true" id="implementing-requiresmainqueuesetup"></a><a href="#implementing-requiresmainqueuesetup" 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>Implementing <code>+ requiresMainQueueSetup</code></h3>
+<p>If you override <code>- constantsToExport</code> then you should also implement <code>+ requiresMainQueueSetup</code> to let React Native know if your module needs to be initialized on the main thread. Otherwise you will see a warning that in the future your module may be initialized on a background thread unless you explicitly opt out with <code>+ requiresMainQueueSetup</code>:</p>
+<pre><code class="hljs css language-objectivec">+ (<span class="hljs-built_in">BOOL</span>)requiresMainQueueSetup
+{
+  <span class="hljs-keyword">return</span> <span class="hljs-literal">YES</span>;  <span class="hljs-comment">// only do this if your module initialization relies on calling UIKit!</span>
+}
+</code></pre>
+<p>If your module does not require access to UIKit, then you should respond to <code>+ requiresMainQueueSetup</code> with <code>NO</code>.</p>
 <h3><a class="anchor" aria-hidden="true" id="enum-constants"></a><a href="#enum-constants" 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>Enum Constants</h3>
 <p>Enums that are defined via <code>NS_ENUM</code> cannot be used as method arguments without first extending RCTConvert.</p>
 <p>In order to export the following <code>NS_ENUM</code> definition:</p>

docs/next/text.html

@@ -390,7 +390,7 @@ AppRegistry.registerComponent(<span class="hljs-string">'AwesomeProject'</span>,
 <p>Specifies font weight. The values 'normal' and 'bold' are supported for most fonts. Not all fonts have a variant for each of the numeric values, in that case the closest one is chosen.</p></li>
 <li><p><strong><code>lineHeight</code></strong>: number</p></li>
 <li><p><strong><code>textAlign</code></strong>: enum('auto', 'left', 'right', 'center', 'justify')</p>
-<p>Specifies text alignment. The value 'justify' is only supported on iOS and fallbacks to <code>left</code> on Android.</p></li>
+<p>Specifies text alignment. The value 'justify' is only supported on iOS and Android Oreo (8.0) or above (API level &gt;= 26). For lower android version it will fallback to <code>left</code>.</p></li>
 <li><p><strong><code>textDecorationLine</code></strong>: enum('none', 'underline', 'line-through', 'underline line-through')</p></li>
 <li><p><strong><code>textShadowColor</code></strong>: <a href="/react-native/docs/next/colors">color</a></p></li>
 <li><p><strong><code>fontFamily</code></strong>: string</p></li>

docs/next/text/index.html

@@ -390,7 +390,7 @@ AppRegistry.registerComponent(<span class="hljs-string">'AwesomeProject'</span>,
 <p>Specifies font weight. The values 'normal' and 'bold' are supported for most fonts. Not all fonts have a variant for each of the numeric values, in that case the closest one is chosen.</p></li>
 <li><p><strong><code>lineHeight</code></strong>: number</p></li>
 <li><p><strong><code>textAlign</code></strong>: enum('auto', 'left', 'right', 'center', 'justify')</p>
-<p>Specifies text alignment. The value 'justify' is only supported on iOS and fallbacks to <code>left</code> on Android.</p></li>
+<p>Specifies text alignment. The value 'justify' is only supported on iOS and Android Oreo (8.0) or above (API level &gt;= 26). For lower android version it will fallback to <code>left</code>.</p></li>
 <li><p><strong><code>textDecorationLine</code></strong>: enum('none', 'underline', 'line-through', 'underline line-through')</p></li>
 <li><p><strong><code>textShadowColor</code></strong>: <a href="/react-native/docs/next/colors">color</a></p></li>
 <li><p><strong><code>fontFamily</code></strong>: string</p></li>