nestjs

## When to use this skill

Use this skill whenever the user wants to:
- Build or refactor a NestJS application
- Implement controllers, providers, and modules
- Apply middleware, pipes, guards, or interceptors
- Configure DI scopes, dynamic modules, or lifecycle hooks
- Add validation, serialization, caching, logging, or queues
- Integrate GraphQL, WebSockets, or microservices
- Document APIs with OpenAPI/Swagger
- Implement authentication/authorization or security hardening
- Write unit or e2e tests for NestJS

## How to use this skill

1. **Identify the topic** from the user's request and find the corresponding example file in the mapping below

2. **Load the appropriate example file** from the `examples/` directory

3. **Follow the specific instructions** in that example file for syntax, structure, and best practices

   **Important Notes**:
   - All examples follow NestJS official documentation structure
   - Examples include both JavaScript and TypeScript versions where applicable
   - Each example file includes key concepts, code examples, and official documentation links
   - Always check the example file for best practices and common patterns

4. **Use templates** from the `templates/` directory to speed up common scaffolding

### Doc mapping (one-to-one with https://docs.nestjs.com/)

**Overview (概览)**
- `examples/overview/introduction.md` → https://docs.nestjs.com/
- `examples/fundamentals/first-steps.md` → https://docs.nestjs.com/first-steps
- `examples/fundamentals/controllers.md` → https://docs.nestjs.com/controllers
- `examples/fundamentals/providers.md` → https://docs.nestjs.com/providers
- `examples/fundamentals/modules.md` → https://docs.nestjs.com/modules
- `examples/fundamentals/middleware.md` → https://docs.nestjs.com/middleware
- `examples/fundamentals/exception-filters.md` → https://docs.nestjs.com/exception-filters
- `examples/fundamentals/pipes.md` → https://docs.nestjs.com/pipes
- `examples/fundamentals/guards.md` → https://docs.nestjs.com/g