Writing Expo Modules

Complete reference for building native modules and views using the Expo Modules API. Covers Swift (iOS), Kotlin (Android), and TypeScript.

When to Use

• Creating a new Expo native module or native view
• Adding native functionality (camera, sensors, system APIs) to an Expo app
• Wrapping platform SDKs for React Native consumption
• Building config plugins that modify native project files
• Adding Android, Apple, or web support to an existing Expo module
• Editing expo-module.config.json, config plugins, or lifecycle hooks

To 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.

References

Consult these resources as needed: