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Guide for creating and writing Expo native modules and views using the Expo Modules API (Swift, Kotlin, TypeScript). Covers module definition DSL, native views, shared objects, config plugins, lifecycle hooks, autolinking, and type system. Use when building or modifying native modules for Expo. Not for migrating an existing Swift module from the definition DSL to the Expo Modules API 2.0 macros; use expo-migrate-module (from the expo-experiments plugin) for that.\nversion: 1.0.0\nlicense: MIT\n---\n\n# Writing Expo Modules\n\nComplete reference for building native modules and views using the Expo Modules API. Covers Swift (iOS), Kotlin (Android), and TypeScript.\n\n## When to Use\n\n- Creating a new Expo native module or native view\n- Adding native functionality (camera, sensors, system APIs) to an Expo app\n- Wrapping platform SDKs for React Native consumption\n- Building config plugins that modify native project files\n- Adding Android, Apple, or web support to an existing Expo module\n- Editing `expo-module.config.json`, config plugins, or lifecycle hooks\n\nTo migrate an existing Swift module from the definition DSL to the Expo Modules API 2.0 macros (`@ExpoModule`, `@JS`, `@Event`), use the `expo-migrate-module` skill (from the `expo-experiments` plugin) instead.\n\n## References\n\nConsult these resources as needed:\n\n```\nreferences\u002F\n  create-expo-module.md      Scaffolding and add-platform-support workflow, defaults, and quirks\n  native-module.md           Module definition DSL: Name, Function, AsyncFunction, Property, Constant, Events, type system, shared objects\n  native-view.md             Native view components: View, Prop, EventDispatcher, view lifecycle, ref-based functions\n  lifecycle.md               Lifecycle hooks: module, iOS app\u002FAppDelegate, Android activity\u002Fapplication listeners\n  config-plugin.md           Config plugins: modifying Info.plist, AndroidManifest.xml, reading values in native code\n  module-config.md           expo-module.config.json fields, file placement, and autolinking behavior\n```\n\n## Quick Start\n\nPrefer `create-expo-module` over manually creating native module files and directories. In practice, the best path is usually to create the scaffold first and then build on top of it. The scaffold sets up the expected layout, `expo-module.config.json`, podspec or Gradle files, TypeScript bindings, and the standalone example app flow.\n\nIf an existing Expo module only needs another platform, use `create-expo-module add-platform-support` instead of manually copying native directories.\n\nSee [references\u002Fcreate-expo-module.md](references\u002Fcreate-expo-module.md) before scaffolding or extending a module. It covers:\n\n- local vs standalone modules\n- `--platform`, `--features`, `--barrel`, `--package-manager`, and non-interactive mode\n- `expo.autolinking.nativeModulesDir`\n- `add-platform-support` behavior and quirks\n\n## Recommended Workflow\n\n1. Choose the scaffold type first:\n   - **Local module** for one app\n   - **Standalone module** for reuse, monorepos, or publishing\n2. Determine native `expo-module` features that you will need.\n   - Based on the user's instructions determine which feature scaffolding will be useful.\n   - Available features: `Constant`, `Function`, `AsyncFunction`, `Event`, `View`, `ViewEvent`, `SharedObject`\n3. Scaffold deliberately:\n   - pass an explicit slug or path\n   - choose `--platform` intentionally instead of relying on defaults\n   - use `--features` to choose code samples which you will modify in the next step to match the real implementation.\n4. Replace generated example code with the real implementation.\n5. If you add a new platform later, prefer `add-platform-support` over manual file copying.\n\n## Practical Scaffolding Rules\n\n- Feature examples are **opt-in**. A newly scaffolded module may be minimal if no features were selected.\n- `ViewEvent` implies `View`.\n- Local modules do **not** generate an `index.ts` barrel by default. Use `--barrel` only if you want one.\n- In non-interactive local scaffolding, pass the positional slug or path explicitly. `--name` changes the native class name, not the folder name.\n- Local modules live in `expo.autolinking.nativeModulesDir` when configured, otherwise in `modules\u002F`.\n- Standalone modules have their own package metadata, scripts, and usually an example app. Local modules use the host app's tooling instead.\n\n## Core File Shapes\n\nThe Swift and Kotlin DSL share the same structure. Swift is usually the clearest primary example; consult the references for feature-specific details.\n\n## Module Structure Reference\n\nThe Swift and Kotlin DSL share the same structure. Both platforms are shown here for reference — in other reference files, Swift is shown as the primary language unless the Kotlin pattern meaningfully differs.\n\n**Swift (iOS):**\n\n```swift\nimport ExpoModulesCore\n\npublic class MyModule: Module {\n  public func definition() -> ModuleDefinition {\n    Name(\"MyModule\")\n\n    Function(\"hello\") { (name: String) -> String in\n      return \"Hello \\(name)!\"\n    }\n  }\n}\n```\n\n**Kotlin (Android):**\n\n```kotlin\npackage expo.modules.mymodule\n\nimport expo.modules.kotlin.modules.Module\nimport expo.modules.kotlin.modules.ModuleDefinition\n\nclass MyModule : Module() {\n  override fun definition() = ModuleDefinition {\n    Name(\"MyModule\")\n\n    Function(\"hello\") { name: String ->\n      \"Hello $name!\"\n    }\n  }\n}\n```\n\n**TypeScript:**\n\n```typescript\nimport { requireNativeModule } from \"expo\";\n\nconst MyModule = requireNativeModule(\"MyModule\");\n\nexport function hello(name: string): string {\n  return MyModule.hello(name);\n}\n```\n\n### expo-module.config.json\n\n```json\n{\n  \"platforms\": [\"android\", \"apple\"],\n  \"apple\": {\n    \"modules\": [\"MyModule\"]\n  },\n  \"android\": {\n    \"modules\": [\"expo.modules.mymodule.MyModule\"]\n  }\n}\n```\n\nNote: iOS uses just the class name; Android uses the fully-qualified class name (package + class). See `references\u002Fmodule-config.md` for all fields.\n\n## Submitting Feedback\nIf you encounter errors, misleading or outdated information in this skill, report it so Expo can improve:\n```bash\nnpx --yes submit-expo-feedback@latest --category skills --subject \"expo-module\" \"\u003Cactionable feedback>\"\n```\nOnly submit when you have something specific and actionable to report. 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iOS uses just the class name; Android uses the fully-qualified class name (package + class). 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Include as much relevant context as possible.",{"type":44,"tag":1383,"props":1384,"children":1385},"style",{},[1386],{"type":50,"value":1387},"html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"items":1389,"total":1494},[1390,1407,1422,1437,1451,1465,1483],{"slug":1391,"name":1391,"fn":1392,"description":1393,"org":1394,"tags":1395,"stars":26,"repoUrl":27,"updatedAt":1406},"eas-app-stores","deploy and submit Expo apps to stores","EAS service (paid). Deploy Expo apps to the app stores with EAS - build and submit to the iOS App Store, Google Play Store, and TestFlight, configure eas.json build and submit profiles, manage app versions and build numbers, and publish App Store metadata and ASO. Use whenever the user wants to deploy, release, or ship an app to production or the app stores, is preparing a production build, running eas build or eas submit, shipping to TestFlight, bumping version or build numbers, or setting up store listing metadata. For deploying an Expo website or API routes, use the eas-hosting skill.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1396,1398,1401,1402,1405],{"name":1397,"slug":1107,"type":15},"Android",{"name":1399,"slug":1400,"type":15},"Deployment","deployment",{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},"iOS","ios",{"name":21,"slug":22,"type":15},"2026-07-24T05:36:44.164663",{"slug":1408,"name":1408,"fn":1409,"description":1410,"org":1411,"tags":1412,"stars":26,"repoUrl":27,"updatedAt":1421},"eas-hosting","deploy Expo websites to EAS Hosting","EAS service (paid). Deploy Expo websites and Expo Router API routes to EAS Hosting - export the web bundle, run eas deploy for production and PR preview URLs, manage environment secrets and custom domains, and work within the Cloudflare Workers runtime. Also covers authoring API routes (+api.ts handlers, HTTP methods, request handling, CORS). Use when deploying an Expo web app or API routes, setting up EAS Hosting, or configuring hosting environments and domains. Not for native builds or store releases - use the eas-app-stores skill for those.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1413,1414,1415,1418],{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1416,"slug":1417,"type":15},"Frontend","frontend",{"name":1419,"slug":1420,"type":15},"Web Development","web-development","2026-07-24T05:36:40.193701",{"slug":1423,"name":1423,"fn":1424,"description":1425,"org":1426,"tags":1427,"stars":26,"repoUrl":27,"updatedAt":1436},"eas-observe","configure EAS Observe for Expo apps","EAS service (paid). Use for anything related to EAS Observe - adding `expo-observe` to an Expo project (AppMetricsRoot\u002FObserveRoot HOC, markInteractive, the useObserve hook, the Expo Router \u002F React Navigation integrations for per-route metrics, and user-defined events via `Observe.logEvent`), querying via the EAS CLI (`eas observe:metrics-summary`, `observe:metrics`, `observe:routes`, `observe:events`, `observe:versions`), or interpreting the resulting metrics (cold\u002Fwarm launch, TTR, TTI, navigation cold\u002Fwarm TTR, update download, and the TTI frameRate params for triaging slow startups).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1428,1429,1430,1433],{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},{"name":1431,"slug":1432,"type":15},"Observability","observability",{"name":1434,"slug":1435,"type":15},"React Native","react-native","2026-07-24T05:36:45.220605",{"slug":1438,"name":1438,"fn":1439,"description":1440,"org":1441,"tags":1442,"stars":26,"repoUrl":27,"updatedAt":1450},"eas-simulator","run and control remote iOS and Android simulators","EAS service (paid). Run and control a user's app on a remote iOS\u002FAndroid simulator hosted on EAS cloud. Read before running any `eas simulator:*` commands - it has the current syntax for this experimental API. Use whenever the user needs a simulator they can't run locally - 'run my app on a cloud simulator', 'use eas simulator to run\u002Finstall\u002Fscreenshot my app', 'I'm on Linux\u002FCursor and need an iOS device', 'no sim on this box \u002F headless CI', 'let an agent click through my app and screenshot it', 'test my dev build on a remote sim with live reload', 'stream a sim to my browser' - even when they don't say 'EAS Simulator' or 'cloud'. On a host WITHOUT a local simulator (Linux, CI, cloud sandbox) it's the default; on macOS, do NOT auto-trigger for a plain 'run on the simulator' - use it only for a cloud\u002Fremote\u002Fshareable sim, an iOS version they lack, or an agent-driven session. NOT for local sims (expo run:ios, Xcode, Android Studio), EAS Build\u002FUpdate, web preview, or physical devices.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1443,1444,1447,1448,1449],{"name":1397,"slug":1107,"type":15},{"name":1445,"slug":1446,"type":15},"CLI","cli",{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},"2026-07-31T05:52:18.602058",{"slug":1452,"name":1452,"fn":1453,"description":1454,"org":1455,"tags":1456,"stars":26,"repoUrl":27,"updatedAt":1464},"eas-update-insights","check health of EAS Updates","EAS service (paid). Check the health of published EAS Update: crash rates, install\u002Flaunch counts, unique users, payload size, and the split between embedded and OTA users per channel. Use when the user asks how an update is performing, whether a rollout is healthy, how many users are on the embedded build vs OTA, or wants to gate CI on update health.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1457,1460,1461,1462,1463],{"name":1458,"slug":1459,"type":15},"Analytics","analytics",{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},{"name":1431,"slug":1432,"type":15},"2026-07-24T05:36:50.17095",{"slug":1466,"name":1466,"fn":1467,"description":1468,"org":1469,"tags":1470,"stars":26,"repoUrl":27,"updatedAt":1482},"eas-workflows","configure EAS workflows for Expo projects","EAS service (paid). Helps understand and write EAS workflow YAML files for Expo projects. Use this skill when the user asks about CI\u002FCD or workflows in an Expo or EAS context, mentions .eas\u002Fworkflows\u002F, or wants help with EAS build pipelines or deployment automation.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1471,1474,1477,1478,1479],{"name":1472,"slug":1473,"type":15},"Automation","automation",{"name":1475,"slug":1476,"type":15},"CI\u002FCD","ci-cd",{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1480,"slug":1481,"type":15},"YAML","yaml","2026-07-24T05:36:43.205514",{"slug":1484,"name":1484,"fn":1485,"description":1486,"org":1487,"tags":1488,"stars":26,"repoUrl":27,"updatedAt":1493},"expo-app-clip","add iOS App Clip targets to Expo","Framework (OSS). Add an iOS App Clip target to an Expo app. Use when the user mentions App Clip, AASA, apple-app-site-association, appclips, smart app banner, or wants to ship a lightweight iOS Clip invoked from a URL alongside their parent app.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1489,1490,1491,1492],{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},{"name":1434,"slug":1435,"type":15},"2026-07-24T05:36:46.195935",22,{"items":1496,"total":1620},[1497,1505,1512,1519,1527,1535,1543,1550,1565,1583,1598,1609],{"slug":1391,"name":1391,"fn":1392,"description":1393,"org":1498,"tags":1499,"stars":26,"repoUrl":27,"updatedAt":1406},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1500,1501,1502,1503,1504],{"name":1397,"slug":1107,"type":15},{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},{"slug":1408,"name":1408,"fn":1409,"description":1410,"org":1506,"tags":1507,"stars":26,"repoUrl":27,"updatedAt":1421},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1508,1509,1510,1511],{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1416,"slug":1417,"type":15},{"name":1419,"slug":1420,"type":15},{"slug":1423,"name":1423,"fn":1424,"description":1425,"org":1513,"tags":1514,"stars":26,"repoUrl":27,"updatedAt":1436},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1515,1516,1517,1518],{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},{"name":1431,"slug":1432,"type":15},{"name":1434,"slug":1435,"type":15},{"slug":1438,"name":1438,"fn":1439,"description":1440,"org":1520,"tags":1521,"stars":26,"repoUrl":27,"updatedAt":1450},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1522,1523,1524,1525,1526],{"name":1397,"slug":1107,"type":15},{"name":1445,"slug":1446,"type":15},{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},{"slug":1452,"name":1452,"fn":1453,"description":1454,"org":1528,"tags":1529,"stars":26,"repoUrl":27,"updatedAt":1464},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1530,1531,1532,1533,1534],{"name":1458,"slug":1459,"type":15},{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},{"name":1431,"slug":1432,"type":15},{"slug":1466,"name":1466,"fn":1467,"description":1468,"org":1536,"tags":1537,"stars":26,"repoUrl":27,"updatedAt":1482},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1538,1539,1540,1541,1542],{"name":1472,"slug":1473,"type":15},{"name":1475,"slug":1476,"type":15},{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1480,"slug":1481,"type":15},{"slug":1484,"name":1484,"fn":1485,"description":1486,"org":1544,"tags":1545,"stars":26,"repoUrl":27,"updatedAt":1493},{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1546,1547,1548,1549],{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},{"name":1434,"slug":1435,"type":15},{"slug":1551,"name":1551,"fn":1552,"description":1553,"org":1554,"tags":1555,"stars":26,"repoUrl":27,"updatedAt":1564},"expo-brownfield","integrate Expo and React Native into native apps","Framework (OSS). Integrate Expo and React Native into an existing native iOS or Android app. Use when the user mentions brownfield, embedding React Native in a native app, AAR\u002FXCFramework, or adding Expo to an existing Kotlin\u002FSwift project. Covers both the isolated approach and the integrated approach.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1556,1557,1558,1561,1562,1563],{"name":1397,"slug":1107,"type":15},{"name":9,"slug":8,"type":15},{"name":1559,"slug":1560,"type":15},"Integrations","integrations",{"name":1403,"slug":1404,"type":15},{"name":21,"slug":22,"type":15},{"name":1434,"slug":1435,"type":15},"2026-07-24T05:36:39.682299",{"slug":1566,"name":1566,"fn":1567,"description":1568,"org":1569,"tags":1570,"stars":26,"repoUrl":27,"updatedAt":1582},"expo-data-fetching","fetch and manage data in Expo apps","Framework (OSS). Use when implementing or debugging ANY network request, API call, or data fetching. Covers fetch API, React Query, SWR, error handling, caching, offline support, and Expo Router data loaders (`useLoaderData`).",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1571,1574,1577,1578,1579],{"name":1572,"slug":1573,"type":15},"API Development","api-development",{"name":1575,"slug":1576,"type":15},"Caching","caching",{"name":9,"slug":8,"type":15},{"name":21,"slug":22,"type":15},{"name":1580,"slug":1581,"type":15},"React","react","2026-07-24T05:36:42.177188",{"slug":1584,"name":1584,"fn":1585,"description":1586,"org":1587,"tags":1588,"stars":26,"repoUrl":27,"updatedAt":1597},"expo-dev-client","build and distribute Expo development clients","Framework (OSS). Build and distribute Expo development clients locally or via TestFlight for internal testing. For production TestFlight releases and store submission, use the eas-app-stores skill.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1589,1590,1591,1592,1593,1596],{"name":1397,"slug":1107,"type":15},{"name":1399,"slug":1400,"type":15},{"name":9,"slug":8,"type":15},{"name":1403,"slug":1404,"type":15},{"name":1594,"slug":1595,"type":15},"Local Development","local-development",{"name":21,"slug":22,"type":15},"2026-07-24T05:36:51.160719",{"slug":1599,"name":1599,"fn":1600,"description":1601,"org":1602,"tags":1603,"stars":26,"repoUrl":27,"updatedAt":1608},"expo-dom","run web components in native apps","Framework (OSS). Use Expo DOM components to run web code in a webview on native and as-is on web. Migrate web code to native incrementally. For the end-to-end migration of a whole web app, use the expo-web-to-native skill.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1604,1605,1606,1607],{"name":9,"slug":8,"type":15},{"name":1416,"slug":1417,"type":15},{"name":21,"slug":22,"type":15},{"name":1434,"slug":1435,"type":15},"2026-07-24T05:36:41.176872",{"slug":1610,"name":1610,"fn":1611,"description":1612,"org":1613,"tags":1614,"stars":26,"repoUrl":27,"updatedAt":1619},"expo-examples","integrate Expo example projects","Framework (OSS). Expo's official example projects - the expo\u002Fexamples repo of ~70 `with-*` integrations (Stripe, Clerk, Supabase, OpenAI, maps, Reanimated, SQLite, Skia, NativeWind, and more). Use when integrating a third-party library or service into an existing Expo app and you want the canonical, version-matched pattern to adapt, or when scaffolding a new project from one with `npx create-expo --example`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},[1615,1616,1617,1618],{"name":9,"slug":8,"type":15},{"name":1559,"slug":1560,"type":15},{"name":21,"slug":22,"type":15},{"name":1434,"slug":1435,"type":15},"2026-07-24T05:36:35.174379",24]