nestjs-expert

Review Nest.js architecture and validate changes with Jest and Supertest.

Updated Jan 9, 2026

Search Tags:#testing #architecture #middleware #nestjs #guards #dependency-injection #interceptors

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Skill: nestjs-expert
Source: https://github.com/diendh/Ferro-VPN/tree/main/.agent/skills/nestjs-expert
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SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Nest.js architecture and DI patterns can become complex in large applications, leading to tangled modules, hard-to-test code, and maintenance challenges.

Core Features & Use Cases

Architecture assessment and module boundary recommendations for Nest.js projects.
Dependency injection pattern optimization, middleware, guards, interceptors, pipes, and testing strategies with Jest/Supertest.
Guidance for integrating TypeORM/Mongoose and Passport.js authentication to ensure scalable, maintainable codebases.
Example: Refactor of a monorepo Nest.js app to improve testability and performance.

Quick Start

Provide a comprehensive Nest.js architecture review for a given project and outline actionable improvements.

Frequently Asked Questions about nestjs-expert

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I resolve circular dependencies in Nest.js modules?▼

To resolve Nest.js circular dependencies, you optimize module boundaries and use forwardRef. This architectural guidance identifies tangled providers and refactors dependency injection patterns for maintainable code.

What's the best way to structure Nest.js guards and interceptors for authentication?▼

Structuring Nest.js guards and interceptors for authentication involves integrating Passport.js strategies. This ensures scalable authorization flows while maintaining clean module boundaries across enterprise applications.

How do I test Nest.js middleware and pipes with Jest and Supertest?▼

Testing Nest.js middleware and pipes with Jest and Supertest requires robust testing strategies. This guidance validates architectural changes through unit tests and integration tests to ensure reliable performance.

Why does my Nest.js provider scope conflict during dependency injection?▼

Nest.js provider scope conflicts during dependency injection occur when request-scoped providers interact incorrectly with singleton components. This guidance detects provider scope conflicts and optimizes injection patterns to prevent runtime errors.

Can I use TypeORM and Mongoose together in a Nest.js enterprise monorepo?▼

Yes, you can integrate TypeORM and Mongoose together in a Nest.js enterprise monorepo. This architectural assessment provides module boundary recommendations to ensure scalable and maintainable database integrations.

How do I handle error handling and configuration in Nest.js architecture?▼

Handling error handling and configuration in Nest.js architecture involves detecting common pitfalls and resolving them systematically. This approach validates changes through type checking and architectural reviews for robust applications.