hjemmesidekongen/expo-simulators
plugins/smedjen/skills/expo-simulators/SKILL.md
iOS Simulator and Android Emulator management — setup, screenshots, recording, and debugging tools.
tools
Updated Apr 5, 2026
$ install --global
skillsauthnpx skillsauth add hjemmesidekongen/ai expo-simulatorsInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
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Last scanned: Apr 5, 2026, 5:28 PM18.1s3 files scanned
SKILL.md
- name:
- expo-simulators
- description:
- >
- user_invocable:
- false
- interactive:
- false
- model_tier:
- junior
- depends_on:
- []
- reads:
- []
- writes:
- []
- type:
- data_validation
- - name:
- screenshots_captured_for_qa
- verify:
- Visual QA screenshots taken on both iOS and Android before marking feature complete
- fail_action:
- Run simctl io screenshot and adb exec-out screencap to capture current state
- on_fail:
- Simulator setup has issues that will block reliable testing — fix before running the app
- on_pass:
- Simulator environment is ready
- origin:
- smedjen
- inspired_by:
- original
- ported_date:
- 2026-03-10
- iteration:
- 2
- changes:
- Replaced basic CLI commands with CI management, profiling, and platform-specific gotchas
expo-simulators
Beyond standard CLI commands — CI integration, platform gotchas, profiling, and device limitations.
CI Simulator Management
GitHub Actions + iOS: macos-14+ runners (Apple Silicon), simulators pre-installed. Boot with xcrun simctl boot in setup step. Headless mode works without Simulator.app.
GitHub Actions + Android: Use reactivecircus/android-emulator-runner. Enable KVM (/dev/kvm), API 31+ google_apis target, emulator-options: -no-window -no-audio -no-boot-anim. Cache AVD snapshots with actions/cache.
Parallel testing: iOS and Android in separate matrix jobs — iOS on macOS, Android on Ubuntu (KVM). Saves 5-10 min per run.
Apple Silicon vs Intel (Android)
M-series Macs require ARM64 images (google_apis;arm64-v8a). x86_64 images launch but crash or run at 10% speed. Check: sdkmanager --list | grep arm64-v8a. Native ARM emulation — no translation layer.
Performance Profiling
iOS Instruments: Time Profiler, Allocations, Core Animation (frame rate). Attach to simulator process — no signing needed.
Android Profiler: CPU/Memory/Network/Energy tabs in Android Studio. For RN: --profile-hermes, open .cpuprofile in Chrome DevTools.
Expo: npx expo start --dev-client + shake > Performance Monitor shows JS and UI thread FPS separately.
Simulator vs Device Limitations
Not available: Real push notifications (iOS supports .apns drag-and-drop simulation only), camera, NFC, Bluetooth, barometric sensor, accurate GPS (use simulated locations), real perf characteristics.
Behaves differently: Biometrics work via Simulator Features menu / adb -e emu finger touch 1. Deep links via xcrun simctl openurl / adb shell am start -d.
Expo-Specific Gotchas
EAS local build: eas build --local --platform ios --profile development — simulator-compatible, requires Xcode CLI tools.
Config plugins: Changes only apply after npx expo prebuild. Native code changes require rebuild — hot reload won't reflect them.
Port conflicts: Two dev clients on same simulator need different ports. Use --port on second instance.
See references/process.md for screen recording, network simulation, multi-device testing, and reset procedures.
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