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flutter-caching

Use when implementing caching or offline behaviour in a Flutter feature - an offline-first repository, image caching, a Dio cache interceptor, a write sync queue, cache invalidation, or choosing between secure storage and shared_preferences. Also triggers on "make it work without internet", "store it locally", or "it is slow, it refetches every time".

skills/flutter-caching/SKILL.md

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You are implementing caching for a Flutter feature. The patterns below assume Dio for HTTP, a secure-storage wrapper for sensitive data, `flutter_bloc` for state, and Clean Architecture (domain/data/presentation) - adapt the names to your stack, the shapes carry over.

## Caching Strategy Selection

| Strategy | When to Use | Package/Impl |
|---|---|---|
| `shared_preferences` | Non-sensitive key-value: UI prefs, filters, TTL timestamps, feature flags | `shared_preferences` |
| Secure storage | Auth tokens, credentials, sensitive user data. Wrap it in a `Storage` service with a `StorageKeys` enum rather than passing raw strings | `flutter_secure_storage` |
| In-memory cache | Short-lived GET responses, session-scoped data, computed values | Dio interceptor or Map in repository |
| `cached_network_image` | Product photos, logos, any remote image in list or detail screens | `cached_network_image` |
| Local DB (drift/sqflite) | Offline-first with complex queries (orders, history, large local datasets) | `drift` or `sqflite` |

**Rule of thumb**: SecureStorage for secrets, shared_preferences for preferences, in-memory for API responses, local DB for offline-first features.