Provides implementation patterns for Clean Architecture, Domain-Driven Design (DDD), and Hexagonal Architecture (Ports & Adapters) in NestJS/TypeScript applications. Use when structuring complex backend systems, designing domain layers with entities/value objects/aggregates, implementing ports and adapters, creating use cases, or refactoring from anemic models to rich domain models with dependency inversion.
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What the file says
# Clean Architecture, DDD & Hexagonal Architecture for NestJS
## Overview
This skill provides comprehensive guidance for implementing Clean Architecture, Domain-Driven Design (DDD), and Hexagonal Architecture patterns in NestJS/TypeScript applications. It covers the architectural layers, tactical patterns, and practical implementation examples for building maintainable, testable, and loosely-coupled backend systems.
## When to Use
- Architecting complex NestJS applications with long-term maintainability
- Refactoring from tightly-coupled MVC to layered architecture
- Implementing rich domain models with business logic encapsulation
- Designing testable systems with swappable infrastructure
- Creating microservices with clear bounded contexts
- Separating business rules from framework code
- Implementing event-driven architectures with domain events
## Instructions
### 1. Understand the Architectural Layers
Clean Architecture organizes code into concentric layers where dependencies flow inward. Inner layers have no knowledge of outer layers:
```
+-------------------------------------+
| Infrastructure (Frameworks, DB) | Outer layer - volatile
…
The line at the top of this page pins the label git:20260323.227390f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_axq2qq6hobtxvbhk
GET https://markdownregistry.com/api/v1/resolve?ref=giuseppe-trisciuoglio/developer-kit/clean-architecture
GET https://markdownregistry.com/api/v1/blob/dff0c40d2f92e1ef631bab1734ec69c7d8752e998cebbbfb07d94645443924e2
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