Modern React patterns and principles. Hooks, composition, performance, TypeScript best practices.
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Principles for building production-ready React applications.
| Type | Use | State |
|---|---|---|
| Server | Data fetching, static | None |
| Client | Interactivity | useState, effects |
| Presentational | UI display | Props only |
| Container | Logic/state | Heavy state |
| Pattern | Extract When |
|---|
| useLocalStorage | Same storage logic needed |
| useDebounce | Multiple debounced values |
| useFetch | Repeated fetch patterns |
| useForm | Complex form state |
| Complexity | Solution |
|---|---|
| Simple | useState, useReducer |
| Shared local | Context |
| Server state | React Query, SWR |
| Complex global | Zustand, Redux Toolkit |
| Scope | Where |
|---|---|
| Single component | useState |
| Parent-child | Lift state up |
| Subtree | Context |
| App-wide | Global store |
| Hook | Purpose |
|---|---|
| useActionState | Form submission state |
| useOptimistic | Optimistic UI updates |
| use | Read resources in render |
| Use Case | Prefer |
|---|---|
| Reusable logic | Custom hook |
| Render flexibility | Render props |
| Cross-cutting | Higher-order component |
| Signal | Action |
|---|---|
| Slow renders | Profile first |
| Large lists | Virtualize |
| Expensive calc | useMemo |
| Stable callbacks | useCallback |
| Scope | Placement |
|---|---|
| App-wide | Root level |
| Feature | Route/feature level |
| Component | Around risky component |
| Pattern | Use |
|---|---|
| Interface | Component props |
| Type | Unions, complex |
| Generic | Reusable components |
| Need | Type |
|---|---|
| Children | ReactNode |
| Event handler | MouseEventHandler |
| Ref | RefObject<Element> |
| Level | Focus |
|---|---|
| Unit | Pure functions, hooks |
| Integration | Component behavior |
| E2E | User flows |
| ❌ Don't | ✅ Do |
|---|---|
| Prop drilling deep | Use context |
| Giant components | Split smaller |
| useEffect for everything | Server components |
| Premature optimization | Profile first |
| Index as key | Stable unique ID |
Remember: React is about composition. Build small, combine thoughtfully.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).