react-best-practices

name	react-best-practices
description	React/Next.js performance optimization. Waterfalls, bundle size, rendering.
allowed-tools	Read, Write, Edit, Glob, Grep, Bash

Tadpole UI & React Performance (Vite 8 + React 19)

eliminate waterfalls -> atomize state -> premium aesthetic.

🎯 Content Map (Read Impact High -> Low)

1. 🔴 1-async-eliminating-waterfalls.md (CRITICAL): Network latency.
2. 🔴 2-bundle-bundle-size-optimization.md (CRITICAL): TTI/Load.
3. 🟠 3-server-server-side-performance.md (HIGH): SSR speed.
4. 🟡 4-client-client-side-data-fetching.md: SWR/Dedupe.
5. 🟡 5-rerender-re-render-optimization.md: Memo/Render.
6. 🟡 6-rendering-rendering-performance.md: Virtualization.
7. ⚪ 7-js-javascript-performance.md: Micro-ops.
8. 🔵 8-advanced-advanced-patterns.md: Rare patterns.

🎯 Core Stack (Tadpole OS)

• Engine: Vite 8 + React 19 + TypeScript 5.9.
• State: Zustand (Atomic stores in src/stores/).
• Styling: Tailwind CSS v4 (CSS-first tokens).
• Animation: Framer Motion 12.

❌ Anti-Patterns

• Waterfalls: Sequential await in stores. Use Promise.all.
• Prop-Drilling: Passing state through >2 layers. Use Zustand.
• Context Overuse: Use React Context sparingly; favor atomic store subscriptions.
• Large Components: Keep UI components < 150 lines.

---

🧠 Aletheia Reasoning Protocol (Performance)

1. Generator (Architecture)

• Boundary: "Server vs Client?".
• Strategy: "Fetch-on-render vs Render-as-you-fetch?".
• State: "URL vs Global vs Local?".

2. Verifier (Bottleneck Hunt)

• Waterfall: "Serial requests in Network tab?".
• Bundle: "Lodash/Moment in bundle?".
• Flash: "Rerenders highlighting whole page?".

3. Reviser (Optimization)

• Memo: "Memoize charts/tables".
• Lazy: "Dynamic import modals".

---

🛡️ Security & Safety Protocol (React)

1. Server Actions: Verify auth INSIDE action.
2. XSS: Sanitize dangerouslySetInnerHTML.
3. Secrets: NO NEXT_PUBLIC_ secrets.
4. Deps: Audit regularly.

Review Checklist

• No sequential fetches.
• Bundle < 200KB.
• No barrel imports.
• Dynamic imports for heavy comps.
• Server Components default.