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