# CLAUDE.md

## Build Commands
- **Build All**: `npm run build`
- **Documentation Build**: `npm run docs:build`

## Test Commands
- **Run All Tests**: `npm run test`
- **Fast Tests (Parallel)**: `npm run test:fast`
- **Fast Memory Tests**: `npm run test:fast:memory`
- **Node Tests**: `npm run test:node`
- **Browser Tests**: `npm run test:browser`
- **Performance Tests**: `npm run test:performance`
- **Lint**: `npm run lint`
- **Lint Fix**: `npm run lint:fix`
- **Check Types**: `npm run check-types`

## Development Scripts
- **Unwatch Tests**: `npm run dev`
- **Watch Example**: `npm run dev:example`
- **Generate Error Messages**: `npm run generate:error-messages`
- **Start Docs Server**: `npm run docs:serve`

## Code Style & Patterns
- **Language**: TypeScript
- **Database**: RxDB (local-first, NoSQL)
- **State Management**: Reactive (RxJS Observables)
- **Formatting**: Uses ESLint. Run `npm run lint` to check and `npm run lint:fix` to auto-fix.
- **Imports**: Uses ES modules (import/export).
- **Paths**: Source code in `src/`, tests in `test/`, documentation in `docs-src/`.
- **TypeScript**: Do not use enums. Prefer types instead of interfaces.
- **Errors**: Do not use `throw new Error()`. Use `throw newRxError()` or `throw newRxTypeError()` instead to reduce build size and do not include full error messages in production builds. Use the error codes from `src/rx-error.ts` and add new error codes if needed like `PL1`, `PL2`. Example: `throw newRxError('PL1', { plugin });`
## Development Workflow

```sh
# 1. Make changes

# 2. Build
npm run build

# 3. Run tests
npm run test:fast:memory

# 4. Run lint
npm run lint

# 5. Check TypeScript types
npm run check-types
```

## Documentation Style
- SHOULD use clear, simple language.
- SHOULD use data and examples to support claims when possible.
- SHOULD be informative.
- SHOULD focus on practical, actionable insights.
- AVOID using em dashes (–) anywhere.
- AVOID constructions like "not just this, but also this".
- AVOID metaphors and cliches.
- AVOID generalizations.
- AVOID upfront warnings or notes, just the output requested.
- AVOID rhetorical questions.
- AVOID specific words like: very, really, literally, actually, certainly, probably, basically, delve, embark, enlightening, esteemed, shed light, craft, creative, imagine, realm, game-changer, unlock, discover, skyrocket, abyss, not alone, in a world where, revolutionize, disruptive, utilize, utilizing, dive deep, tapestry, illuminate, unveil, pivotal, intricate, elucidate, hence, furthermore, realm, however, harness, exciting, groundbreaking, cutting-edge, remarkable, it remains to be seen, glimpse into, navigating, landscape, stark, testament, in summary, in conclusion, moreover, boost, skyrocket, opened up, powerful, inquiries, ever-evolving.
- Review your response and ensure no em dashes.
- MUST format FAQ sections using HTML `<details>` and `<summary>` tags. Ensure there is an empty line before and after the inner markdown content so it parses correctly.
