Offline-first ecommerce PWA for bad or no connectivity — browse, cart, wishlist, and checkout without waiting on the network. Writes go to IndexedDB first; a sync queue pushes orders to the server when online. TypeScript monorepo: Astro + React, Express + SQLite, custom push/pull sync with retries and idempotency.

indexeddb dexie sync-engine eventual-consistency browser-database local-first ecommerce-pwa mutation-queue checkout-offline

• Updated Jun 21, 2026
• TypeScript

Offline-first sync layer: queue mutations while offline, reconcile on reconnect, and dedupe concurrent writes — with a framework-free live demo of the sync lifecycle.

sync typescript reconciliation offline-first dedupe indexeddb optimistic-updates offline-sync server-state mutation-queue

• Updated Jul 18, 2026
• TypeScript

Framework-agnostic offline-first sync toolkit — durable mutation queue, conflict resolution strategies, and background re-sync with exponential backoff.

conflict-resolution sync typescript pwa offline-first indexeddb crdt exponential-backoff last-write-wins mutation-queue

• Updated Jul 18, 2026
• TypeScript