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only ever one entry component registered with <code>AppRegistry</code> and it is handled automatically, you do not need to use this API.</p></div><p><code>AppRegistry</code> is the JS entry point to running all React Native apps. App root components should register themselves with <code>AppRegistry.registerComponent</code>, then the native system can load the bundle for the app and then actually run the app when it&#x27;s ready by invoking <code>AppRegistry.runApplication</code>.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> Text</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> AppRegistry </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&#x27;react-native&#x27;</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">const</span><span class="token plain"> </span><span class="token function-variable function" style="color:#79b6f2">App</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token parameter">props</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=&gt;</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">  </span><span class="token tag punctuation" style="color:#657b83">&lt;</span><span class="token tag class-name" style="color:#fac863">View</span><span class="token tag punctuation" style="color:#657b83">&gt;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">    </span><span class="token tag punctuation" style="color:#657b83">&lt;</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">&gt;</span><span class="token plain">App1</span><span class="token tag punctuation" style="color:#657b83">&lt;/</span><span class="token tag class-name" style="color:#fac863">Text</span><span class="token tag punctuation" style="color:#657b83">&gt;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">  </span><span class="token tag punctuation" style="color:#657b83">&lt;/</span><span class="token tag class-name" style="color:#fac863">View</span><span class="token tag punctuation" style="color:#657b83">&gt;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">AppRegistry</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">registerComponent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">&#x27;Appname&#x27;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token operator" style="color:#fc929e">=&gt;</span><span class="token plain"> App</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>To &quot;stop&quot; an application when a view should be destroyed, call <code>AppRegistry.unmountApplicationComponentAtRootTag</code> with the tag that was passed into <code>runApplication</code>. These should always be used as a pair.</p><p><code>AppRegistry</code> should be required early in the <code>require</code> sequence to make sure the JS execution environment is setup before other modules are required.</p><hr><h1><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="reference"></a>Reference<a aria-hidden="true" tabindex="-1" class="hash-link" href="#reference" title="Direct link to heading">#</a></h1><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="methods"></a>Methods<a aria-hidden="true" tabindex="-1" class="hash-link" href="#methods" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="setwrappercomponentprovider"></a><code>setWrapperComponentProvider()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#setwrappercomponentprovider" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setWrapperComponentProvider</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">provider</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>provider</td><td>ComponentProvider</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="enablearchitectureindicator"></a><code>enableArchitectureIndicator()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#enablearchitectureindicator" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">enableArchitectureIndicator</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">enabled</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>enabled</td><td>boolean</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registerconfig"></a><code>registerConfig()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registerconfig" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerConfig</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">[</span><span class="token plain">config</span><span class="token punctuation" style="color:#657b83">]</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>config</td><td>AppConfig</td><td>yes</td><td>See below.</td></tr></tbody></table><p>Valid <code>AppConfig</code> keys are:</p><ul><li>&#x27;appKey&#x27; (string)- Required.</li><li>&#x27;component&#x27; (ComponentProvider) - Optional.</li><li>&#x27;run&#x27; (Function) - Optional.</li><li>&#x27;section&#x27; (boolean) - Optional.</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registercomponent"></a><code>registerComponent()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registercomponent" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerComponent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">appKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> componentProvider</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> section</span><span class="token operator" style="color:#fc929e">?</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>appKey</td><td>string</td><td>yes</td></tr><tr><td>componentProvider</td><td>ComponentProvider</td><td>yes</td></tr><tr><td>section</td><td>boolean</td><td>no</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registerrunnable"></a><code>registerRunnable()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registerrunnable" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerRunnable</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">appKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> run</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>appKey</td><td>string</td><td>yes</td></tr><tr><td>run</td><td>Function</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registersection"></a><code>registerSection()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registersection" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerSection</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">appKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> component</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>appKey</td><td>string</td><td>yes</td></tr><tr><td>component</td><td>ComponentProvider</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="getappkeys"></a><code>getAppKeys()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#getappkeys" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getAppKeys</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Returns an Array of AppKeys</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="getsectionkeys"></a><code>getSectionKeys()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#getsectionkeys" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getSectionKeys</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Returns an Array of SectionKeys</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="getsections"></a><code>getSections()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#getsections" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getSections</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Returns all Runnables which is an object with key of <code>AppKeys</code> and value of type of <code>Runnable</code> which consist of:</p><ul><li>&#x27;component&#x27; (ComponentProvider).</li><li>&#x27;run&#x27; (Function).</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="getrunnable"></a><code>getRunnable()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#getrunnable" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getRunnable</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">appKey</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Returns a <code>Runnable</code> object which consist of:</p><ul><li>&#x27;component&#x27; (ComponentProvider).</li><li>&#x27;run&#x27; (Function).</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="getregistry"></a><code>getRegistry()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#getregistry" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getRegistry</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Returns a type <code>Registry</code> which consist of:</p><ul><li>&#x27;sections&#x27; (Array of strings).</li><li>&#x27;runnables&#x27; (Runnables).</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="setcomponentproviderinstrumentationhook"></a><code>setComponentProviderInstrumentationHook()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#setcomponentproviderinstrumentationhook" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setComponentProviderInstrumentationHook</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">hook</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>hook</td><td>Function</td><td>yes</td><td>See below.</td></tr></tbody></table><p>A valid <code>hook</code> accepts the following as arguments:</p><ul><li>&#x27;component&#x27; (ComponentProvider)- Required.</li><li>&#x27;scopedPerformanceLogger&#x27; (IPerformanceLogger)- Required.</li></ul><p>The <code>hook</code> function returns a React Component</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="runapplication"></a><code>runApplication()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#runapplication" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">runApplication</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">appKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> appParameters</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Loads the JavaScript bundle and runs the app.</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>appKey</td><td>string</td><td>yes</td></tr><tr><td>appParameters</td><td>any</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="unmountapplicationcomponentatroottag"></a><code>unmountApplicationComponentAtRootTag()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#unmountapplicationcomponentatroottag" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">unmountApplicationComponentAtRootTag</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">rootTag</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Stops an application when a view should be destroyed.</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>rootTag</td><td>number</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registerheadlesstask"></a><code>registerHeadlessTask()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registerheadlesstask" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerHeadlessTask</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">taskKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> taskProvider</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Register a headless task. A headless task is a bit of code that runs without a UI. @param taskKey the key associated with this task @param taskProvider a promise returning function that takes some data passed from the native side as the only argument; when the promise is resolved or rejected the native side is notified of this event and it may decide to destroy the JS context.</p><p>This is a way to run tasks in JavaScript while your app is in the background. It can be used, for example, to sync fresh data, handle push notifications, or play music.</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>taskKey</td><td>String</td><td>yes</td><td>See below.</td></tr><tr><td>taskProvider</td><td>TaskProvider</td><td>yes</td><td>See below.</td></tr></tbody></table><ul><li>A valid <code>TaskProvider</code> is a function that returns a <code>Task</code>.</li><li>A <code>Task</code> is a function that accepts any data as argument and returns a Promise that resolves to undefined.</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="registercancellableheadlesstask"></a><code>registerCancellableHeadlessTask()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#registercancellableheadlesstask" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">registerCancellableHeadlessTask</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">taskKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> taskProvider</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> taskCancelProvider</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Register a headless task which can be cancelled. A headless task is a bit of code that runs without a UI. @param taskKey the key associated with this task @param taskProvider a promise returning function that takes some data passed from the native side as the only argument; when the promise is resolved or rejected the native side is notified of this event and it may decide to destroy the JS context. @param taskCancelProvider a void returning function that takes no arguments; when a cancellation is requested, the function being executed by taskProvider should wrap up and return ASAP.</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th><th>Description</th></tr></thead><tbody><tr><td>taskKey</td><td>String</td><td>yes</td><td>See below.</td></tr><tr><td>taskProvider</td><td>TaskProvider</td><td>yes</td><td>See below.</td></tr><tr><td>taskCancelProvider</td><td>TaskCancelProvider</td><td>yes</td><td>See below.</td></tr></tbody></table><ul><li>A valid <code>TaskProvider</code> is a function that returns a <code>Task</code>.</li><li>A <code>Task</code> is a function that accepts any data as argument and returns a Promise that resolves to undefined.</li><li>A valid <code>TaskCancelProvider</code> is a function that returns a <code>TaskCanceller</code>.</li><li>A <code>TaskCanceller</code> is a function that accepts no argument and returns void.</li></ul><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="startheadlesstask"></a><code>startHeadlessTask()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#startheadlesstask" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">startHeadlessTask</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">taskId</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> taskKey</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> data</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Only called from native code. Starts a headless task.</p><p>@param taskId the native id for this task instance to keep track of its execution @param taskKey the key for the task to start @param data the data to pass to the task</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>taskId</td><td>number</td><td>yes</td></tr><tr><td>taskKey</td><td>string</td><td>yes</td></tr><tr><td>data</td><td>any</td><td>yes</td></tr></tbody></table><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="cancelheadlesstask"></a><code>cancelHeadlessTask()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#cancelheadlesstask" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">cancelHeadlessTask</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">taskId</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> taskKey</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Only called from native code. Cancels a headless task.</p><p>@param taskId the native id for this task instance that was used when startHeadlessTask was called @param taskKey the key for the task that was used when startHeadlessTask was called</p><p><strong>Parameters:</strong></p><table><thead><tr><th>Name</th><th>Type</th><th>Required</th></tr></thead><tbody><tr><td>taskId</td><td>number</td><td>yes</td></tr><tr><td>taskKey</td><td>string</td><td>yes</td></tr></tbody></table></div></article><div class="docMetadata margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/facebook/react-native-website/blob/master/website/versioned_docs/version-0.63/appregistry.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small class="docMetadata-updated">Last updated on <time datetime="2020-10-29T04:19:29.000Z" class="docLastUpdatedAt_1gIo">10/29/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/docs/appearance"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Appearance</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/appstate"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">AppState »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3iuQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#methods" class="table-of-contents__link">Methods</a><ul><li><a href="#setwrappercomponentprovider" class="table-of-contents__link"><code>setWrapperComponentProvider()</code></a></li><li><a href="#enablearchitectureindicator" class="table-of-contents__link"><code>enableArchitectureIndicator()</code></a></li><li><a href="#registerconfig" class="table-of-contents__link"><code>registerConfig()</code></a></li><li><a href="#registercomponent" class="table-of-contents__link"><code>registerComponent()</code></a></li><li><a href="#registerrunnable" class="table-of-contents__link"><code>registerRunnable()</code></a></li><li><a href="#registersection" class="table-of-contents__link"><code>registerSection()</code></a></li><li><a href="#getappkeys" class="table-of-contents__link"><code>getAppKeys()</code></a></li><li><a href="#getsectionkeys" class="table-of-contents__link"><code>getSectionKeys()</code></a></li><li><a href="#getsections" class="table-of-contents__link"><code>getSections()</code></a></li><li><a href="#getrunnable" class="table-of-contents__link"><code>getRunnable()</code></a></li><li><a href="#getregistry" class="table-of-contents__link"><code>getRegistry()</code></a></li><li><a href="#setcomponentproviderinstrumentationhook" class="table-of-contents__link"><code>setComponentProviderInstrumentationHook()</code></a></li><li><a href="#runapplication" class="table-of-contents__link"><code>runApplication()</code></a></li><li><a href="#unmountapplicationcomponentatroottag" class="table-of-contents__link"><code>unmountApplicationComponentAtRootTag()</code></a></li><li><a href="#registerheadlesstask" class="table-of-contents__link"><code>registerHeadlessTask()</code></a></li><li><a href="#registercancellableheadlesstask" class="table-of-contents__link"><code>registerCancellableHeadlessTask()</code></a></li><li><a href="#startheadlesstask" 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