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react-patterns

Skill461 starsChanged 3 months agoMITView on GitHub

Modern React patterns and principles. Hooks, composition, performance, TypeScript best practices.

We split this skill into the rules it gives an agent

2 rules. 0 are common, 2 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 32 edited versions we read keep these.

  • 2

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Prefer small, focused components

    line 31
  2. Distinctive:

    Check if actually slow

    line 125

“Common” is measured: kept by at least 6 in 10 of the 32 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

React Patterns

Principles for building production-ready React applications.

1. Component Design Principles

Component Types

TypeUseState
ServerData fetching, staticNone
ClientInteractivityuseState, effects
PresentationalUI displayProps only
ContainerLogic/stateHeavy state

Design Rules

  • One responsibility per component
  • Props down, events up
  • Composition over inheritance
  • Prefer small, focused components

2. Hook Patterns

When to Extract Hooks

PatternExtract When
useLocalStorageSame storage logic needed
useDebounceMultiple debounced values
useFetchRepeated fetch patterns
useFormComplex form state

Hook Rules

  • Hooks at top level only
  • Same order every render
  • Custom hooks start with "use"
  • Clean up effects on unmount

3. State Management Selection

ComplexitySolution
SimpleuseState, useReducer
Shared localContext
Server stateReact Query, SWR
Complex globalZustand, Redux Toolkit

State Placement

ScopeWhere
Single componentuseState
Parent-childLift state up
SubtreeContext
App-wideGlobal store

4. React 19 Patterns

New Hooks

HookPurpose
useActionStateForm submission state
useOptimisticOptimistic UI updates
useRead resources in render

Compiler Benefits

  • Automatic memoization
  • Less manual useMemo/useCallback
  • Focus on pure components

5. Composition Patterns

Compound Components

  • Parent provides context
  • Children consume context
  • Flexible slot-based composition
  • Example: Tabs, Accordion, Dropdown

Render Props vs Hooks

Use CasePrefer
Reusable logicCustom hook
Render flexibilityRender props
Cross-cuttingHigher-order component

6. Performance Principles

When to Optimize

SignalAction
Slow rendersProfile first
Large listsVirtualize
Expensive calcuseMemo
Stable callbacksuseCallback

Optimization Order

  1. Check if actually slow
  2. Profile with DevTools
  3. Identify bottleneck
  4. Apply targeted fix

7. Error Handling

Error Boundary Usage

ScopePlacement
App-wideRoot level
FeatureRoute/feature level
ComponentAround risky component

Error Recovery

  • Show fallback UI
  • Log error
  • Offer retry option
  • Preserve user data

8. TypeScript Patterns

Props Typing

PatternUse
InterfaceComponent props
TypeUnions, complex
GenericReusable components

Common Types

NeedType
ChildrenReactNode
Event handlerMouseEventHandler
RefRefObject<Element>

9. Testing Principles

LevelFocus
UnitPure functions, hooks
IntegrationComponent behavior
E2EUser flows

Test Priorities

  • User-visible behavior
  • Edge cases
  • Error states
  • Accessibility

10. Anti-Patterns

❌ Don't✅ Do
Prop drilling deepUse context
Giant componentsSplit smaller
useEffect for everythingServer components
Premature optimizationProfile first
Index as keyStable unique ID

Remember: React is about composition. Build small, combine thoughtfully.

When to Use

This skill is applicable to execute the workflow or actions described in the overview.

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