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CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Commands

pnpm install              # Install dependencies
pnpm test                 # Run all tests (vitest)
pnpm test -- cart         # Run a single test file by name
pnpm typecheck            # Type-check all packages
pnpm build                # Build all packages
pnpm dev                  # Start API (port 4000) + React client

Architecture

pnpm monorepo with two packages:

  • packages/domain — Event-sourced domain model using @rotorsoft/act. Pure domain logic, no I/O.
  • packages/app — Full-stack: tRPC API server + React/Vite client with SSE event streaming.

Domain model (packages/domain/src/)

Built on @rotorsoft/act — aggregates emit events that patch state, reactions automate workflows, projections build read models.

  • schemas.ts — Zod schemas for all action payloads, event payloads, and state types
  • cart.ts — Cart aggregate (AddItem, RemoveItem, ClearCart, SubmitCart, PublishCart)
  • inventory.ts — Inventory aggregate (ImportInventory)
  • orders.ts — Orders read-model projection (materialized from CartSubmitted/CartPublished)
  • invariants.ts — Business rule constraints (max 3 items, must have items, must be open)
  • bootstrap.ts — Composes slices into the app, defines reactions (CartSubmitted → PublishCart)

App layer (packages/app/src/)

  • api/index.ts — tRPC router: mutations for commands, queries for state, SSE subscription for live events
  • client/App.tsx — Single-file React app (Shop, Orders, Admin views)
  • dev-server.ts — Dev server with seed data (5 products, 3 test carts)

@rotorsoft/act patterns

Patch handler: (event: Committed, state: Readonly<S>) => Partial<S> — access payload via event.data, current state is 2nd arg.

Emit handler: (actionPayload, snapshot, target) => [EventName, data]

Invariant shape: { description: string; valid: (state, actor?) => boolean }

Empty payloads: Use ZodEmpty = z.record(z.string(), z.never())

Reactions: .void() reactions are NEVER processed by drain(). Use .to((event) => ({ target: event.stream })) for self-targeting.

Test isolation: Call store().seed() in beforeEach. Call app.correlate() before app.drain() to register reaction targets.

Commit conventions

Follow conventional commits: feat:, fix:, refactor:, test:, chore:, docs:

All AI commits must include Co-Authored-By trailer.