coco-cashu

A modular, TypeScript-first toolkit for building Cashu wallets and applications.

⚠️ Alpha software: This library is under active development and APIs may change. Use with caution in production and pin versions.

coco-cashu provides a complete foundation for Cashu development with a storage-agnostic core that handles all the complexity: proof management, mint synchronization, quote lifecycle, counter tracking, and state updates through a typed event bus. Choose from ready-to-use storage adapters (SQLite3, IndexedDB, Expo SQLite) or implement your own using the simple repository interface. For React developers, there's a dedicated wrapper with hooks and context providers for seamless integration.

Architecture

                    ┌─────────────┐
                    │   React     │
                    │   Wrapper   │
                    └──────┬──────┘
                           │ consumes
                           ▼
        ┌──────────────────────────────────┐
        │                                  │
        │            @core                 │
        │                                  │
        │  • Services & Business Logic     │
        │  • Event Bus                     │
        │  • Repository Interfaces         │
        │  • Plugin System (lifecycle)     │
        │                                  │
        └────┬──────────┬──────────┬───────┘
             │          │          │
      depends│   depends│   depends│
             ▼          ▼          ▼
      ┌──────────┐ ┌──────────┐ ┌──────────┐
      │ SQLite3  │ │ IndexedDB│ │  Expo    │
      │ Adapter  │ │ Adapter  │ │  SQLite  │
      └──────────┘ └──────────┘ └──────────┘
         (Node)       (Web)       (Mobile)

Packages

• packages/core — storage-agnostic core with services, typed event bus, plugin system, and in-memory repositories for testing.
• packages/react — React wrapper with hooks and context providers for easy integration in React apps.
• packages/sqlite3 — SQLite3 repository implementations for Node (uses sqlite3 npm package).
• packages/indexeddb — IndexedDB repository implementations for web.
• packages/expo-sqlite — Expo SQLite repository implementations for React Native.
• packages/demo-cli — Node CLI demo using the SQLite3 adapter.
• packages/demo-web — Vite web demo using the IndexedDB adapter.

Philosophy

• Modular and headless: Bring your own storage and UI.
• Strongly typed: Clean TypeScript interfaces and event types.
• Minimal dependencies: Focus on correctness and clarity.

Plugins

The core exposes a minimal plugin API to hook into lifecycle events with access to specific services.

• See packages/core/README.md → Plugins for details and examples.
• Register at construction or via manager.use(plugin); dispose with manager.dispose().

Development

Use TypeScript for type checking and tsdown to build packages. See packages/core/README.md for API details and usage.