NestJS OOP and Design Patterns

Improve changeability and correctness through clear responsibilities, encapsulated invariants, and deliberate collaboration. Use patterns to solve observed forces, never as decoration.

Pre-execution conflict guard

Before editing files or running any state-changing command, reconcile active instructions. Read-only inspection may continue.

Prerequisites

Inspect repository instructions, installed versions, callers, tests, module wiring, and the observed design pressure. Preserve behavior and user changes; do not select a pattern before architecture/runtime constraints are known. Read other active skills only when their decisions overlap.

Primary ownership

This skill owns object responsibilities, invariants, encapsulation, collaborator contracts, SOLID trade-offs, patterns, and behavior-preserving refactoring. When installed and relevant, coordinate with: