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react-native-patterns

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Actualizado5 de julio de 2026 a las 14:05

React Native platform, Metro-port and emulator/simulator worktree isolation, and cleanup conventions (expo-dev-client, adb, avdmanager, simctl). Use when working on React Native apps.

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bjornjee

bjornjee/skills

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SKILL.md

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name	react-native-patterns
description	React Native platform, Metro-port and emulator/simulator worktree isolation, and cleanup conventions (expo-dev-client, adb, avdmanager, simctl). Use when working on React Native apps.

React Native

Applies to React Native projects only — if the repo has no react-native dependency in package.json, ignore this rule. (The broad TS/TSX matching is deliberate — no file pattern can express the dependency condition.)

Platform

Build system: expo-dev-client, not Expo Go.
Connection modes: usb (adb reverse + localhost), wifi (LAN IP), emulator (10.0.2.2).
Prefer cloud-hosted signaling for WebRTC — local servers cause ICE failures on non-home networks.
adb reverse only forwards TCP, not UDP — plan around this for media protocols.

Engineering

State: server state → React Query; client state → Zustand; component state until it's shared. No Redux by default.
Persistence: MMKV over AsyncStorage; encrypt anything sensitive.
Navigation: auth-gating swaps navigator trees on auth state — never conditionally hidden screens. Deep links and push-tap navigation run after state hydration, not before.
Lists: FlashList over FlatList past ~50 items (provide size estimates). Hermes stays on. expo-image for cached images.

Worktree ops (agent-dashboard flow)

Each feature worktree gets a unique Metro port.
Main project uses default port 8081. Worktrees start from 8082, incrementing.
Scan all worktrees for .metro-port files to find ports in use. Verify with lsof.
Write the assigned port to .metro-port in the worktree root.
AVDs are named feat-<feature_name>. Created via avdmanager, device pixel_6.
iOS Simulators are named feat-<feature_name>. Created via xcrun simctl, device iPhone 16.
Store the Simulator UUID in .sim-uuid in the worktree root.
Ask the user which platform(s) to set up: Android, iOS, or Both.

Cleanup

Kill Metro process on the assigned port (read from .metro-port).
Delete Android AVD feat-<feature_name> via avdmanager.
Shut down and delete iOS Simulator (prefer UUID from .sim-uuid, fall back to name).
Remove marker files: .metro-port, .sim-uuid.

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React Native

Platform

Build system: expo-dev-client, not Expo Go.

Connection modes: usb (adb reverse + localhost), wifi (LAN IP), emulator (10.0.2.2).

Prefer cloud-hosted signaling for WebRTC — local servers cause ICE failures on non-home networks.

adb reverse only forwards TCP, not UDP — plan around this for media protocols.

Engineering

State: server state → React Query; client state → Zustand; component state until it's shared. No Redux by default.

Persistence: MMKV over AsyncStorage; encrypt anything sensitive.

Navigation: auth-gating swaps navigator trees on auth state — never conditionally hidden screens. Deep links and push-tap navigation run after state hydration, not before.

Lists: FlashList over FlatList past ~50 items (provide size estimates). Hermes stays on. expo-image for cached images.

Worktree ops (agent-dashboard flow)

Each feature worktree gets a unique Metro port.

Main project uses default port 8081. Worktrees start from 8082, incrementing.

Scan all worktrees for .metro-port files to find ports in use. Verify with lsof.

Write the assigned port to .metro-port in the worktree root.

AVDs are named feat-<feature_name>. Created via avdmanager, device pixel_6.

iOS Simulators are named feat-<feature_name>. Created via xcrun simctl, device iPhone 16.

Store the Simulator UUID in .sim-uuid in the worktree root.

Ask the user which platform(s) to set up: Android, iOS, or Both.

Cleanup

Kill Metro process on the assigned port (read from .metro-port).

Delete Android AVD feat-<feature_name> via avdmanager.

Shut down and delete iOS Simulator (prefer UUID from .sim-uuid, fall back to name).

Remove marker files: .metro-port, .sim-uuid.