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awesome-copilot/skills/react-container-presentation-component/references/component-architecture.md
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# Component Architecture Reference
This reference defines classification, file layout, and dependency direction in `src/components`.
## Design Intent and Principles
The goal of this skill is not only to add React components, but to apply the Container/Presentation pattern consistently with clear separation of responsibilities and dependency direction.
This reference does not define full application-wide architecture. It focuses on design quality at the component boundary.
- Separate rendering responsibilities from logic responsibilities.
- Do not place state management, side effects, or business decisions in the presentation layer.
- Avoid mixing responsibilities across boundaries and keep dependency direction explicit.
## Classification
- Place all components under `src/components`.
- Use only two categories:
- `ui`: render-only, stateless components.
- `features`: components that include logic.
## Reclassification Rule
If the user requests `ui` but the implementation contains any of the following, treat it as `features` and ask for confirmation before creating files:
- `useState`, `useReducer`, or `useEffect`.
- Async behavior (API calls, timers, subscriptions).
- Reading from or writing to context/store.
- Business/data transformation logic.
Ask using these options:
- `Create as features`
- `Keep ui and move logic/state to parent or features`
## Layer Responsibilities
This skill defines layers in two stages.
### 1. Component Type Layer
| Type | Responsibility |
| ---------- | ------------------------------------------------------------------------------------------------------ |
| `ui` | Reusable render-only component. Must not include business logic, side effects, or state management. |
| `features` | Use-case-oriented component. Handles state transitions, event interpretation, and async orchestration. |
### 2. Internal Layer in `features`
| Layer | Responsibility | Primary files |
| -------------- | ----------------------------------------------------------------------------------- | -------------------------------------------------------------------------- |
| `container` | Handles state management, side effects, event handling, and data fetching. | `index.tsx`, `use<ComponentName>.tsx`, `types.ts` |
| `presentation` | Receives props and renders UI only. Must not perform external I/O or state updates. | `presentation.tsx`, `presentation.module.scss`, `presentation.stories.tsx` |
Notes:
- `ui` is composed of presentation only.
- `features` must separate container and presentation.
## Implementation Rules
### ui
- Keep components stateless.
- Accept data and callbacks via props.
- Do not add side effects or data fetching.
- Prefer primitives from Mantine or other UI libraries first; use custom JSX/SCSS only when needed.
### features
- Use the Container/Presentation pattern.
- Keep logic in `use<ComponentName>.tsx`.
- Follow `Container/Presentation Separation Rules (Anti-patterns and Decision Examples)` below for detailed responsibility boundaries and anti-patterns.
### Container/Presentation Separation Rules (Anti-patterns and Decision Examples)
Principles:
- Container is responsible for state management, side effects, event interpretation, and async processing.
- Presentation is responsible only for rendering from received props.
- Keep business decisions and data transformation in container-side code, not in presentation.
Placement rules:
- Place in container: `useState` / `useReducer` / `useEffect`, API calls, context/store read-write, business rule application.
- Place in presentation: JSX rendering and display-only branching (for example: empty, loading, error views).
- Use `types.ts` to define I/O contracts between container and presentation.
Anti-patterns:
- Calling APIs or mutations from presentation.
- Updating context/store directly from presentation.
- Implementing business decisions (authorization checks, state transition decisions, data shaping) in presentation.
- Splitting files formally while keeping practical logic in presentation.
Good / Bad examples:
- Bad: `presentation.tsx` fetches data and manages loading state directly.
- Good: `use<ComponentName>.tsx` manages data fetching and state, and `presentation.tsx` renders only from props such as `isLoading`, `items`, and `onAction`.
## Dependency Direction
- `features` -> `ui`: allowed.
- `ui` -> `features`: forbidden.
## File Structure
### ui
- `index.tsx`
- `presentation.tsx`
- `presentation.stories.tsx`
- `presentation.module.scss`
### features
- `index.tsx`
- `use<ComponentName>.tsx`
- `presentation.tsx`
- `types.ts`
- `presentation.stories.tsx`
- `presentation.module.scss`
## Storybook Minimum
- Always create `Default`.
- Add state-specific stories only when distinct states exist.
- Prefer story sets based on behavior:
- Interactive controls: `Hover`.
- Input-like: `Focus`, `Error`, `Disabled`.
- Layout/open-close: `Open`, `Closed`, `Empty`.