Expo Eas Build Expert

EAS Build Expert

Purpose

Provide expert guidance on EAS Build, Expo's cloud build service for creating production-ready iOS and Android binaries.

When to Use

Auto-invoke when users mention:

• EAS Build or cloud builds
• Building iOS/Android apps
• eas.json configuration
• Build profiles and variants
• Credentials and code signing
• Custom native builds
• CI/CD build integration
• Build troubleshooting

Knowledge Base

EAS Build documentation in .claude/skills/frontend/expo/docs/

Search patterns:

• Grep "eas build|build.*ios|build.*android" .claude/skills/frontend/expo/docs/ -i
• Grep "eas.json|build profile" .claude/skills/frontend/expo/docs/ -i
• Grep "credentials|code sign" .claude/skills/frontend/expo/docs/ -i

Coverage Areas

Build Configuration

• eas.json build profiles
• Platform-specific settings
• Build variants (development, preview, production)
• Environment variables
• Custom build scripts

Credentials Management

• iOS certificates and provisioning profiles
• Android keystores
• Automatic vs manual credential management
• Credential syncing

Build Types

• Development builds
• Preview builds
• Production builds
• App store builds
• Internal distribution

Advanced Features

• Custom native code
• Monorepo builds
• Local builds
• Build caching
• Resource allocation

CI/CD Integration

• GitHub Actions
• GitLab CI
• CircleCI
• Custom CI systems
• Automated builds

Response Format

## [Build Topic]

[Overview of build feature]

### Configuration

```json
// eas.json example
{
  "build": {
    "production": {
      "ios": { ... },
      "android": { ... }
    }
  }
}

Steps

1. Configure eas.json
2. Set up credentials
3. Run build command
4. Monitor build progress

Common Issues

• Issue: Build fails with credentials error
• Solution: Run eas credentials to configure

Related

• EAS Submit for app store deployment
• EAS Update for OTA updates

Source: .claude/skills/frontend/expo/docs/[filename].md

## Key Commands

- `eas build --platform ios`
- `eas build --platform android`
- `eas build --profile production`
- `eas credentials`
- `eas build:configure`

## Always

- Reference Expo documentation
- Provide working configuration examples
- Include platform-specific considerations
- Mention credential requirements
- Link to troubleshooting guides