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**Vite optimizations:** - Switch from @vitejs/plugin-react to @vitejs/plugin-react-swc → 20-40% faster HMR in development → Rust-based transform is 20x faster than Babel **Code-splitting strategy:** Split monolithic bundle into 5 optimized vendor chunks: - react-vendor (141.76 kB) - React core, rarely changes - ui-vendor (120.52 kB) - Radix UI components, rarely changes - table-vendor (42.99 kB) - TanStack Table/Query + PapaParse - utils-vendor (26.26 kB) - Utilities (clsx, zod, date-fns, etc.) - index (51.81 kB) - App code, changes frequently **Performance improvements:** - Bundle structure: 1 monolithic → 5 optimized chunks - App code bundle: 123.49 kB → 14.73 kB (gzip) - Caching efficiency: 88% reduction in bytes on app updates - Parallel chunk loading: Browser can download multiple chunks simultaneously - Long-term caching: Vendor chunks can be cached for 1 year+ **Metrics:** Before: - Build time: 7.98s - Single bundle: 383.71 kB (123.49 kB gzip) After: - Build time: 8.60s (+0.62s for chunking, acceptable) - Total size: 383.34 kB (122.67 kB gzip) - Chunks: 5 vendor chunks + app code **User impact:** When app code updates: - Before: Re-download 123.49 kB - After: Re-download 14.73 kB only - Savings: 88% fewer bytes on updates **Build verification:** - TypeScript check: ✅ Passed - Production build: ✅ Success (8.60s) - Chunk generation: ✅ 5 chunks created correctly - Total bundle size: ✅ No regression (-0.82 kB) **Test plan:** - npm run check → Type checking passes - npm run build → Build succeeds with proper chunking - Verify chunks are created in dist/public/assets/ - Test dev server with npm run dev (HMR should be faster) **Rollback:** git revert HEAD && npm install
**Packages added:** - compression (gzip/deflate response compression) - helmet (security headers) - express-rate-limit (API rate limiting) - cors (CORS configuration) - @types/compression, @types/cors (TypeScript support) **Security improvements:** 1. Helmet Security Headers: - X-Content-Type-Options: nosniff (prevent MIME sniffing) - X-Frame-Options: SAMEORIGIN (clickjacking protection) - X-XSS-Protection: 1; mode=block - Strict-Transport-Security (HSTS for HTTPS) - Content-Security-Policy (production only, disabled in dev for Vite HMR) - Cross-Origin-Embedder-Policy: disabled (allows Vite dev mode) 2. Rate Limiting: - Applied to /api/* routes only - 100 requests per 15 minutes per IP - Standard RateLimit-* headers - Custom error message: "Too many requests from this IP, please try again later." - Prevents API abuse and DoS attacks 3. CORS Configuration: - Configurable via ALLOWED_ORIGINS environment variable - Comma-separated list of allowed origins - Credentials support enabled - Defaults to permissive (allow all) if not configured - Production recommendation: Set explicit origins **Performance improvements:** 1. Compression Middleware: - Gzip compression level 6 (balanced for Raspberry Pi) - Threshold: 1024 bytes (skip tiny responses) - Expected: 60-80% reduction in transfer size for text - Minimal CPU overhead suitable for ARM devices **Configuration changes:** - Added ALLOWED_ORIGINS to .env.example with documentation - Example: ALLOWED_ORIGINS="https://tabletamer.piapps.dev,https://example.com" **Middleware ordering (optimized):** 1. Compression (early, affects all responses) 2. Helmet (security headers) 3. CORS (before routes) 4. Rate limiting (/api routes) 5. Body parsing (json, urlencoded) 6. Custom logging 7. Application routes **Build verification:** - TypeScript check: ✅ Passed - Production build: ✅ Success (8.69s) - Server bundle: 7.8kb (+0.8kb from middleware, acceptable) - Dev mode: ✅ Compatible with Vite HMR **Expected production impact:** - Transfer size: -65% (gzip on 123KB → ~43KB over wire) - Security score: F → A+ (securityheaders.com) - API protection: ✅ Rate limited - XSS/Clickjacking: ✅ Mitigated - CORS: ✅ Configurable **Raspberry Pi safety:** - Compression level 6 (not 9) - balanced CPU usage - Rate limiting uses in-memory store (lightweight) - All middleware tested for ARM compatibility - No blocking operations on main thread **Test plan:** - npm run check → TypeScript passes - npm run build → Build succeeds - npm run dev → Dev server starts with HMR - curl -I http://localhost:5000 → Check security headers - curl -H "Accept-Encoding: gzip" → Verify compression - Spam /api endpoint 101 times → Get 429 rate limit **Rollback:** git revert HEAD && npm install
**Dev tooling packages:** - husky (^9.1.7) - Git hooks management - lint-staged (^16.2.6) - Run tools on staged files - prettier (^3.6.2) - Code formatting **Pre-commit hooks:** - Configured Husky to run lint-staged on commit - lint-staged runs Prettier on all staged TS/TSX/JS/JSON/MD files - Prevents poorly formatted code from being committed - Automatic formatting ensures consistency across the team **Prettier configuration (.prettierrc):** - Semi: true - Single quotes: false (use double quotes) - Trailing commas: all - Print width: 100 - Tab width: 2 spaces - End of line: LF (Unix-style) - Arrow parens: always **EditorConfig (.editorconfig):** - Indent: 2 spaces - End of line: LF - Charset: UTF-8 - Trim trailing whitespace: true - Insert final newline: true - Ensures consistent editor settings across IDEs **GitHub Actions CI (.github/workflows/ci.yml):** - Runs on push and pull requests to main/develop - Matrix testing: Node 18.x and 20.x - Steps: 1. TypeScript type checking (npm run check) 2. Production build (npm run build) 3. Tests (npm test) 4. Security audit (production deps only, non-blocking) - Separate security job for npm audit - Uses npm ci for faster, reproducible installs - Caches npm dependencies for speed **Package.json updates:** - Added format script: npm run format - Updated lint script to target correct directories - Added lint-staged configuration - Added prepare script (husky install) **Developer experience improvements:** - Automatic code formatting on commit - Consistent code style across team - CI feedback within ~2 minutes - Catches TypeScript errors before merge - Security audit alerts on new vulnerabilities - No manual formatting needed **Build verification:** - TypeScript check: ✅ Passed - Production build: ✅ Success (8.39s) - Husky hooks: ✅ Installed - Pre-commit: ✅ Runs lint-staged **Expected impact:** - 100% formatted commits (no style debates) - Faster PR reviews (consistent formatting) - Earlier bug detection (CI runs checks) - Security awareness (audit on every PR) - Onboarding improved (EditorConfig auto-configures IDEs) **Usage:** - npm run format - Format all files - git commit - Auto-formats staged files via hook - CI runs automatically on push/PR **Note:** ESLint configuration deferred to future PR - Currently no linting rules enforced - Prettier handles formatting only - Can add ESLint later without conflicts **Rollback:** git revert HEAD && npm install
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Caution Review failedThe pull request is closed. WalkthroughThis pull request establishes project development infrastructure and security enhancements. It introduces code formatting and linting tools (.editorconfig, .prettierrc, Husky hooks), adds a CI/CD GitHub Actions workflow, configures new environment variables, updates package.json with tooling and runtime dependencies, integrates security middleware into the Express server, and optimizes the Vite build with code splitting. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Server
participant RateLimit as Rate Limiter
participant Helmet
participant Compression
participant API
Client->>Server: HTTP Request
Server->>RateLimit: Check rate limit
alt Rate limit exceeded
RateLimit-->>Client: 429 Too Many Requests
else Within limit
RateLimit->>Helmet: Apply security headers
Helmet->>Compression: Apply compression
Compression->>API: Route to handler
API-->>Compression: Response (JSON)
Compression-->>Helmet: Compress
Helmet-->>Server: Add security headers
Server->>Server: Log timing & response
Server-->>Client: HTTP Response
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Areas requiring extra attention:
Poem
✨ Finishing touches
🧪 Generate unit tests (beta)
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📒 Files selected for processing (8)
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