expo-module

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

References

Consult these resources as needed:

references/
  create-expo-module.md      Scaffolding and add-platform-support workflow, defaults, and quirks
  native-module.md           Module definition DSL: Name, Function, AsyncFunction, Property, Constant, Events, type system, shared objects
  native-view.md             Native view components: View, Prop, EventDispatcher, view lifecycle, ref-based functions
  lifecycle.md               Lifecycle hooks: module, iOS app/AppDelegate, Android activity/application listeners
  config-plugin.md           Config plugins: modifying Info.plist, AndroidManifest.xml, reading values in native code
  module-config.md           expo-module.config.json fields, file placement, and autolinking behavior

Quick Start

Prefer create-expo-module over manually creating native modul