Day 5 of 5

Build and Deploy

Today you will create a production build, configure app icons and splash screens, and publish your app to the Expo Go channel. You will also learn the path to the App Store and Google Play.

json

{
  "expo": {
    "name": "My App",
    "slug": "my-app",
    "version": "1.0.0",
    "icon": "./assets/icon.png",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#1e3a5f"
    },
    "ios": {
      "bundleIdentifier": "com.yourname.myapp",
      "buildNumber": "1"
    },
    "android": {
      "package": "com.yourname.myapp",
      "versionCode": 1
    }
  }
}

bash

# Install EAS CLI
npm install -g eas-cli
eas login

# Configure your project
eas build:configure

# Build for both platforms
eas build --platform android
eas build --platform ios

# Submit to stores
eas submit --platform android
eas submit --platform ios

Tip: Use npx expo publish for OTA updates — users get new JS instantly without a store release.

Exercise: Publish a Build

Replace icon.png and splash.png with your designs
Run eas build:configure and answer the prompts
Create a development build: eas build --profile development
Test the .apk on an Android device
Push an OTA update with npx expo publish

Day 5 Summary

app.json controls name, icons, and bundle IDs
EAS Build creates native .ipa/.apk files in the cloud
OTA updates push new JS without a store review
iOS requires an Apple Developer account ($99/yr)
Google Play charges a one-time $25 registration fee

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