CLAUDE.md アーキテクチャパターン

# CLAUDE.md Layered Architecture ## Layer 1: Global (~/.claude/CLAUDE.md) ```markdown # Global Rules (apply to ALL projects) ## Safety - Never commit .env files or secrets - Never run destructive git commands without confirmation - Never modify files outside the current project ## Style - Use TypeScript strict mode - Prefer functional patterns over classes - Commit messages: imperative mood, <72 chars ## Communication - Respond in Korean, code in English - Use structured output (headings, lists, tables) ``` ## Layer 2: Project Root (./CLAUDE.md) ```markdown # Project: E-Commerce Platform ## Stack - Runtime: Node.js 20 + TypeScript 5.4 - Framework: Next.js 15 (App Router) - Database: PostgreSQL 16 + Drizzle ORM - Testing: Vitest + Playwright ## Conventions - API routes: src/app/api/[resource]/route.ts - Components: PascalCase, co-located tests - Database migrations: drizzle-kit generate ## Forbidden - Do NOT use any ORM other than Drizzle - Do NOT add runtime dependencies without checking bundle size - Do NOT modify shared types in src/types/ without updating all consumers ``` ## Layer 3: Subdirectory (./src/components/CLAUDE.md) ```markdown # Component Rules - Every component must have a .test.tsx file - Use compound component pattern for complex UI - Props interface must be exported separately - Storybook story required for design-system components ``` ## Resolution Order 1. Subdirectory CLAUDE.md (most specific) 2. Project root CLAUDE.md 3. Global CLAUDE.md (least specific) - More specific rules override general ones - Safety rules from global always apply