Code Quality Principles

Universal quality checklist for code reviews and implementation. Framework-agnostic.

Core Principles

DRY — Don't Repeat Yourself

• 3+ occurrences of the same pattern → extract into a reusable unit (function, module, type)
• Single source of truth — constants, types, schemas live in one place
• Shared logic belongs in a dedicated module, not copy-pasted across features
• Exception: 2 similar lines are fine. Don't extract for 2 occurrences — wait for the third.

KISS — Keep It Simple