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href=/docs/legacy/native-modules-intro>Legacy Architecture</a></div></ul></nav></div></div></aside><main class=docMainContainer_a9sJ><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Appendix</h1></header> 5<h2 class="anchor anchorWithStickyNavbar_JmGV" id=i-terminology>I. Terminology<a href=#i-terminology class=hash-link aria-label="Direct link to I. Terminology" title="Direct link to I. Terminology">​</a></h2> 6<ul> 7<li> 8<p><strong>Spec</strong> - TypeScript or Flow code that describes the API for a Turbo Native Module or Fabric Native component. Used by <strong>Codegen</strong> to generate boilerplate code.</p> 9</li> 10<li> 11<p><strong>Native Modules</strong> - Native libraries that have no User Interface (UI) for the user. Examples would be persistent storage, notifications, network events. These are accessible to your JavaScript application code as functions and objects.</p> 12</li> 13<li> 14<p><strong>Native Component</strong> - Native platform views that are available to your application JavaScript code through React Components.</p> 15</li> 16<li> 17<p><strong>Legacy Native Components</strong> - Components which are running on the old React Native architecture.</p> 18</li> 19<li> 20<p><strong>Legacy Native Modules</strong> - Modules which are running on the old React Native architecture.</p> 21</li> 22</ul> 23<h2 class="anchor anchorWithStickyNavbar_JmGV" id=ii-codegen-typings>II. Codegen Typings<a href=#ii-codegen-typings class=hash-link aria-label="Direct link to II. Codegen Typings" title="Direct link to II. Codegen Typings">​</a></h2> 24<p>You may use the following table as a reference for which types are supported and what they map to in each platform:</p> 25<table><thead><tr><th>Flow<th>TypeScript<th>Flow Nullable Support<th>TypeScript Nullable Support<th>Android (Java)<th>iOS (ObjC)<tbody><tr><td><code>string</code><td><code>string</code><td><code>?string</code><td><code>string | null</code><td><code>string</code><td><code>NSString</code><tr><td><code>boolean</code><td><code>boolean</code><td><code>?boolean</code><td><code>boolean | null</code><td><code>Boolean</code><td><code>NSNumber</code><tr><td>Object Literal<br><code>{| foo: string, ...|}</code><td><code>{ foo: string, ...} as const</code><td><code>?{| foo: string, ...|}</code><td><code>?{ foo: string, ...} as const</code><td>-<td>-<tr><td>Object [<a href=#notes>1</a>]<td>Object [<a href=#notes>1</a>]<td><code>?Object</code><td><code>Object | null</code><td><code>ReadableMap</code><td><code>@</code> (untyped dictionary)<tr><td><code>Array&lt;T></code><td><code>Array&lt;T></code><td><code>?Array&lt;T></code><td><code>Array&lt;T> | null</code><td><code>ReadableArray</code><td><code>NSArray</code> (or <code>RCTConvertVecToArray</code> when used inside objects)<tr><td><code>Function</code><td><code>Function</code><td><code>?Function</code><td><code>Function | null</code><td>-<td>-<tr><td><code>Promise&lt;T></code><td><code>Promise&lt;T></code><td><code>?Promise&lt;T></code><td><code>Promise&lt;T> | null</code><td><code>com.facebook.react.bridge.Promise</code><td><code>RCTPromiseResolve</code> and <code>RCTPromiseRejectBlock</code><tr><td>Type Unions<br><code>'SUCCESS'|'FAIL'</code><td>Type Unions<br><code>'SUCCESS'|'FAIL'</code><td>Only as callbacks<td><td>-<td>-<tr><td>Callbacks<br><code>() =></code><td>Callbacks<br><code>() =></code><td>Yes<td><td><code>com.facebook.react.bridge.Callback</code><td><code>RCTResponseSenderBlock</code><tr><td><code>number</code><td><code>number</code><td>No<td><td><code>double</code><td><code>NSNumber</code></table> 26<h3 class="anchor anchorWithStickyNavbar_JmGV" id=notes>Notes:<a href=#notes class=hash-link aria-label="Direct link to Notes:" title="Direct link to Notes:">​</a></h3> 27<p><b>[1]</b> We strongly recommend using Object literals instead of Objects.</p> 28<div class="theme-admonition theme-admonition-info admonition_WCGJ alert alert--info"><div class=admonitionHeading_GCBg><span class=admonitionIcon_L39b><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>info</div><div class=admonitionContent_pbrs><p>You may also find it useful to refer to the JavaScript specifications for the core modules in React Native. 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