# Project Rules

## Stack
- TypeScript 5.x with strict mode
- React 19 + Next.js 15 (App Router)
- Tailwind CSS v4 for styling
- Drizzle ORM for database access

## Code Standards
- Named exports only (no default exports)
- Prefer `const` assertions and satisfies operator
- Use Result<T, E> pattern for error handling
- Maximum 30 lines per function

## File Organization
- Colocate tests: `foo.ts` → `foo.test.ts`
- One component per file
- Barrel exports (index.ts) for public module APIs

## Git
- Conventional commits: feat|fix|chore|docs|test
- Squash merge feature branches
- Branch naming: type/description

# Application Guidelines

## Architecture
- This is a monorepo managed with Turborepo
- Apps: web (Next.js), api (Express), mobile (React Native)
- Shared packages: ui, config, types

## Code Standards
- TypeScript strict mode in all packages
- Use barrel exports (index.ts) for public APIs
- No default exports; use named exports everywhere
- Prefer async/await over raw Promises

## API Design
- RESTful endpoints follow /api/v1/{resource} pattern
- All responses use { data, error, meta } envelope
- Validate request bodies with Zod schemas
- Return 4xx for client errors, 5xx for server errors

## Database
- Use Prisma ORM for all database operations
- Migrations checked into source control
- Soft-delete pattern: use deletedAt timestamp, never hard delete
- All timestamps stored as UTC

## Testing
- Jest for unit tests, Playwright for E2E
- Test files colocated: foo.ts -> foo.test.ts
- Mock external services, never call real APIs in tests