Understand-Anything/understand-anything-plugin/skills/understand/frameworks/react.md

React Framework Addendum

Injected into file-analyzer and architecture-analyzer prompts when React is detected. Do NOT use as a standalone prompt — always appended to the base prompt template.

React Project Structure

When analyzing a React project, apply these additional conventions on top of the base analysis rules.

Canonical File Roles

File / Pattern	Role	Tags
src/App.tsx	Root application component — mounts providers, router, and top-level layout	entry-point, ui
components/*.tsx, components/**/*.tsx	Reusable UI components	ui
hooks/*.ts, hooks/*.tsx	Custom React hooks — encapsulate reusable stateful logic	service, utility
contexts/*.tsx, context/*.tsx	React Context providers and consumers — shared state across component tree	service, state
pages/*.tsx, views/*.tsx	Page-level components mapped to routes	ui, routing
utils/*.ts, helpers/*.ts	Pure utility functions — formatting, validation, transformations	utility
types/*.ts, types/*.d.ts	TypeScript type definitions and interfaces	type-definition
services/*.ts, api/*.ts	API client functions and data-fetching logic	service
store/*.ts, slices/*.ts	State management (Redux, Zustand, etc.)	service, state
constants/*.ts	Application-wide constants and enums	config
__tests__/*.tsx, *.test.tsx, *.spec.tsx	Unit and integration tests	test

Edge Patterns to Look For

Component composition — When a parent component renders a child component in its JSX return, create contains edges from the parent to the child. These edges represent the component tree hierarchy.

Hook usage — When a component or hook imports and calls a custom hook (useX), create depends_on edges from the consumer to the hook module. Hooks are the primary mechanism for shared logic in React.

Context provider/consumer — When a Context provider wraps components, create publishes edges from the provider to the context definition. When components call useContext or use a custom context hook, create subscribes edges from the consumer to the context.

Props drilling chains — When props are passed through multiple component layers without being used, create depends_on edges along the chain to surface the coupling depth.

Architectural Layers for React

Assign nodes to these layers when detected:

Layer ID	Layer Name	What Goes Here
layer:ui	UI Layer	components/, pages/, views/, layout components
layer:service	Service Layer	hooks/, contexts/, services/, api/, store/
layer:types	Types Layer	types/, shared TypeScript interfaces and type definitions
layer:utility	Utility Layer	utils/, helpers/, pure functions
layer:config	Config Layer	App.tsx, router configuration, provider setup, constants
layer:test	Test Layer	__tests__/, *.test.tsx, *.spec.tsx

Notable Patterns to Capture in languageLesson

• Component composition over inheritance: React favors composing components via props and children rather than class inheritance hierarchies
• Custom hooks for reusable logic: Hooks prefixed with use extract stateful logic into shareable modules without changing the component tree
• React.memo for performance: Components wrapped in React.memo skip re-renders when props are unchanged — indicates performance-sensitive paths
• Controlled vs. uncontrolled components: Controlled components derive state from props; uncontrolled components manage internal state via refs
• Render props pattern: Components that accept a function as children or a render prop to delegate rendering decisions to the consumer