nestjs-expert

To fix Nest.js dependency resolution errors, verify that all required providers are correctly registered and exported in your module definitions. This Skill helps identify missing module exports, provider scope misconfigurations, and injection token typos causing the UserService or similar services to fail at runtime.

Resolving circular dependencies in Nest.js requires using forwardRef() and specific injection techniques to break the cycle. This Skill provides expert guidance on refactoring module architecture and applying forward references to successfully manage circular imports between tightly coupled modules.

The Nest.js request lifecycle executes components in a specific sequence: middleware, guards, interceptors, pipes, and finally the controller handler. This Skill explains the architectural execution order and helps you strategically place business logic across these layers for optimal request processing.

Setting up Nest.js testing modules with Jest and Supertest involves configuring the Test module builder to provide mocked dependencies and compile the application context. This Skill details strategies for initializing testing modules, mocking providers, and writing robust end-to-end test suites.

Yes, you can integrate Prisma ORM and Passport.js authentication into a Nest.js backend by configuring them as custom providers and modules. This Skill offers architectural advice on combining Prisma data access with Passport.js authentication strategies within your dependency injection system.

The best way to debug Nest.js runtime errors is to analyze the dependency injection container and trace provider scoping issues within your module architecture. This Skill assists in identifying architectural flaws, resolving complex runtime exceptions, and optimizing overall framework performance.