mobile-offline-sync
Skill4 starsChanged 5 months agoMITView on GitHub
Offline-first patterns for React Native including local databases (WatermelonDB, expo-sqlite, MMKV), background sync, conflict resolution, and large file offline queues. Use for field-capture apps with unreliable connectivity.
2 other projects use a version of this.
Adopted by
Most recently taken up by
- wrsilva/reis-mobiletheir own version, first seen Nov 8, 2026
- SkillMedev/mobile-app-engineeringtheir own version, first seen Oct 5, 2026
Other versions2 projects use a version of this.
Word for word · 0
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Wrote their own version · 2
- wrsilva/reis-mobile★ 8same name
- SkillMedev/mobile-app-engineering★ 0same name
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
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The file
We split this skill into the rules it gives an agent
2 rules. About 0 are common, 1 is distinctive, and 1 is very specific to this project.
≈0
Common · estimate
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≈1
Distinctive · estimate
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1
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- Common
- Distinctive
- Very specific
- Distinctive: line 23
RealmJS sync features deprecated September 2025: Avoid for new projects; existing apps should plan migration.
- Very specific: line 27
Optimistic UI: Write locally first, update UI immediately, queue sync operation with pendingSync flag
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Files
Mobile Offline Sync
Offline-first architecture patterns for React Native field-capture applications (construction, inspection, agriculture) where connectivity is unreliable and large files must be captured locally then synced later.
Database Decision Matrix
| Library | Use Case | Performance | Sync |
| WatermelonDB 0.27 | Complex relational data, 10k+ records, reactive queries | Excellent (lazy load, native thread) | Built-in protocol |
| expo-sqlite SDK 53 | Expo managed workflow, simpler relational needs | Good (sync API available) | Manual or PowerSync |
| op-sqlite 15.x | Performance-critical, advanced SQLite features (FTS5, sqlite-vec) | Best raw speed (5x less memory) | PowerSync |
| MMKV v4 | Preferences, session tokens, feature flags, small cached data | 30x faster than AsyncStorage | N/A (key-value only) |
RealmJS sync features deprecated September 2025. Avoid for new projects; existing apps should plan migration.
Sync Strategy Quick Reference
- Optimistic UI: Write locally first, update UI immediately, queue sync operation with
pendingSyncflag - Queue-based: Operation log with retry counts and exponential backoff; replay on reconnect via NetInfo listener
- CRDTs (Yjs, Automerge): Reserve for collaborative editing scenarios; most field apps use last-write-wins safely since records have single-user ownership
Large File Offline Queue
For video capture: compress to 20-50 MB with react-native-compressor, persist upload queue and chunk progress to MMKV, use tus protocol or 500 KB chunked uploads for resumable transfers across app restarts.
Cross-References
- reference.md: Database install commands, conflict resolution strategies, background sync setup, security patterns, anti-patterns table
- examples.md: Production TypeScript for WatermelonDB models, MMKV+Zustand stores, sync managers, video capture flows, migration patterns
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