fundamentals/solid-principles

SOLID principles analysis checks single responsibility, open-closed extension, Liskov substitutability, interface segregation, and dependency inversion to prevent tightly coupled, monolithic backend classes during refactoring.

Fragile dependencies in NestJS services often stem from direct Prisma coupling; applying dependency inversion by abstracting low-level services behind interfaces resolves this and prevents tightly coupled modules.

The best way to map domain classes to SOLID responsibilities is evaluating inheritance trees for substitutability and pinpointing where strategy or decorator patterns enable extension without modification.

You need to split bloated interfaces in TypeScript when they fail interface segregation, meaning you must separate them to match real client needs rather than forcing clients to depend on unused methods.

Yes, this SOLID review approach works for Domain-Driven Design by ensuring architecture modules avoid monolithic structures and maintain clean boundaries for maintainable business logic.