React Native using Expo and Typescript

This is a React Native demo app using the Expo framework and written in TypeScript. It uses the managed workflow.

This repo used to also contain a type definition file for Expo. That work was merged into the

@types/expo

@types/expo

expo

Prerequisites

• Node.js.
• Yarn.
• Optional: XCode, since it includes the iOS Simulator. XCode only runs on Macs.
• Optional: Android Studio, since it includes the Android Virtual Device Manager.

You don't need to install any global npm packages for this repo.

expo-cli

Warnings When Installing Packages

There are a surprising amount of of warnings when installing Node packages, because of peer dependencies not being correct. My guess is that the Expo team has a tough time getting all the added React Native libraries to play well together. This app seems to run fine, so I believe it's safe to ignore the warnings.

Running the App

Start the local server. This will give you a QR code that you can scan using the Expo Client app on your mobile device.

yarn start

If you're on a Mac and have Xcode installed, you can run the app using the iOS Simulator with the following command. I am sure you can do something similar with Android.

yarn ios

Known and Unknown Packages

When upgrading Expo,

expo-cli

expo-

Known packages:

@unimodules/core, expo-analytics-amplitude, expo-apple-authentication, expo-asset, expo-av, expo-barcode-scanner, expo-blur, expo-brightness, expo-camera, expo-constants, expo-facebook, expo-font, expo-linear-gradient, expo-local-authentication, expo-permissions, expo-sensors, react-native-gesture-handler, react-native-maps, react-native-reanimated, react-native-screens, react-native-svg, react-native-safe-area-context, @react-native-community/masked-view, react-native, react, typescript, @types/react, babel-preset-expo, @types/react-native, expo

Unknown packages:

@react-navigation/native, @react-navigation/stack, tslib, @types/expo__vector-icons, @typescript-eslint/eslint-plugin, @typescript-eslint/parser, eslint, eslint-config-prettier, eslint-plugin-prettier, eslint-plugin-react, expo-cli, prettier

Troubleshooting

If you have issues running the app it may help clearing the React Native packager cache. Use the command

yarn expo start --clear

More tips found in this thread on the Expo Forum.

Similar Projects

• expo-ts-example, the basis for this project
• TypeScript-React-Native-Starter
• react-native-typescript-starter