# SmartExpect - Project Hints

## Project Overview
- **Name**: @push.rocks/smartexpect
- **Purpose**: A minimal, promise-first assertion library for testing with TypeScript support
- **License**: MIT
- **Version**: 2.4.2

## Architecture
1. **Core Assertion Class** (`ts/smartexpect.classes.assertion.ts`):
   - Central `Assertion<T, M>` class handles all assertion logic
   - Supports sync and async execution modes
   - Property drilling with `.property()` and `.arrayItem()`
   - Custom matcher extension via `expect.extend()`

2. **Namespace Organization** (`ts/namespaces/`):
   - Matchers grouped by type: string, number, array, object, boolean, function, date, type
   - Each namespace provides type-specific assertions
   - All namespaces extend the base Assertion class

3. **Entry Point** (`ts/index.ts`):
   - Exports the main `expect()` function
   - Auto-detects promises for async mode
   - Provides `expect.any()` and `expect.anything()` utility matchers

## Key Features
- **Async-first**: `.resolves` and `.rejects` modifiers for promise assertions
- **Timeout support**: `.withTimeout(ms)` for async assertions
- **Negation**: `.not` modifier inverts any assertion
- **Property navigation**: Chain `.property()` and `.arrayItem()` for nested assertions
- **Custom matchers**: Extend with `expect.extend({ matcherName: fn })`
- **Debugging**: `.log()` method to inspect values during assertion chains

## Dependencies
- `@push.rocks/smartdelay`: For async timeout handling
- `@push.rocks/smartpromise`: For promise utilities
- `fast-deep-equal`: For deep equality comparisons

## Testing
- Tests use `@git.zone/tstest` with tap
- Test files import from compiled `dist_ts/` directory
- Test naming: `*.both.ts` (browser+node), `*.node.ts`, `*.browser.ts`
- Run with `pnpm test`

## Recent Changes
- v2.4.2: General maintenance
- v2.4.1: Fixed toHaveProperty alias to forward arguments correctly
- v2.4.0: Major improvements (details not specified)

## Common Patterns
1. **Basic assertions**: `expect(value).toEqual(expected)`
2. **Async assertions**: `expect(promise).resolves.toEqual(value)`
3. **Property drilling**: `expect(obj).property('nested').property('value').toEqual(x)`
4. **Array navigation**: `expect(arr).arrayItem(0).toEqual(firstItem)`
5. **Custom messages**: `expect(x).setFailMessage('Custom error').toEqual(y)`