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Design Patterns Release Notes

v1.1.0 (2026-03-04)

Added

  • Testing Patterns (references/testing-patterns.md) — Unit, integration, and E2E test code for every pattern category (GoF, Architecture, System)
  • Anti-Patterns Catalog (references/anti-patterns.md) — 15 anti-patterns with detection commands, severities, and cures
  • Migration Playbook (references/migration-playbook.md) — 5 step-by-step migration guides with verification checkpoints and rollback plans
  • Output Formats (references/output-format.md) — ADR template, Refactoring Report, Health Check, Pattern Comparison Matrix

Fixed

  • Builder pattern build() method now returns a copy to prevent shared-reference mutation

v1.0.0 (2026-03-04)

Added

  • 4D Process: Detect → Diagnose → Design → Deliver — systematic codebase analysis and refactoring
  • Iron Laws — "No Pattern Without Pain", "Evidence Before Elegance", "Incremental Over Revolutionary"
  • HARD-GATE enforcement — mandatory codebase scan with file:line evidence before any pattern proposal
  • Complexity Scoring — 4-dimension Health Score (/20) per module (Size, Coupling, Cohesion, Testability)
  • 3-Scale Pattern Selection Matrix:
    • Code-Level: 23 GoF Patterns (Creational, Structural, Behavioral) + 5 SOLID Principles
    • Architecture-Level: Service Layer, Repository, Clean Architecture, Hexagonal, DDD, CQRS
    • System-Level: Microservices, Event-Driven, Circuit Breaker, Saga, API Gateway, Bulkhead, Sidecar, Strangler Fig
  • Framework-Specific Implementations:
    • Next.js (App Router, Server Components, Server Actions)
    • FastAPI (Depends() DI, Pydantic, Background Tasks)
    • NestJS (Modules, Guards, Interceptors, built-in CQRS)
    • Django (Service Layer beyond MTV)
    • Express (Middleware Chain of Responsibility)
    • Go (Interface-based DI, cmd/internal structure)
  • Anti-Pattern Detection — God Object, Logic Leakage, Tight Coupling, Shotgun Surgery, Feature Envy, Primitive Obsession
  • Code Generation — production-ready boilerplate per framework
  • Migration Paths — step-by-step guides: Monolith → Service Layer → Clean Architecture → Microservices
  • Red Flags — checklist to prevent over-engineering and pattern abuse
  • /design-patterns slash command — works with Claude Code, Cursor, Codex, OpenCode
  • Plugin manifests — Claude Code (.claude-plugin/), Cursor (.cursor-plugin/)
  • Install guides — Codex (.codex/INSTALL.md), OpenCode (.opencode/INSTALL.md)