component-analysis（成分分析）

Component Analysis Skill

This skill provides intelligent codebase analysis for component creation. It prevents duplication, suggests architectural improvements, and identifies reusable subcomponents.

When to Activate

Activate this skill when:

• Creating a new component
• User describes a UI element they need
• Analyzing a Figma design
• Planning component architecture
• Deciding between new component vs variant

Analysis Steps

1. Component Existence Check — Deep Discovery

Build a Component Capability Map by scanning the entire component library:

a. Fetch ALL components:

Glob: src/components/ui/*.tsx (exclude __tests__/*, *.stories.tsx)
Glob: src/components/custom/*/*.tsx (exclude __tests__/*, *.stories.tsx)

b. Extract metadata per component using Grep:

• export interface.*Props → props interfaces
• variants: blocks → CVA variants and their names
• export { or export const → public exports

c. Build and present a Capability Map:

| Component   | Location | Variants              | Key Props                |
|-------------|----------|-----------------------|--------------------------|
| Button      | ui/      | 7 variants, 4 sizes   | onClick, loading, leftIcon |
| Badge       | ui/      | 5 variants            | —                        |
| TextField   | ui/      | —                     | label, error, helperText |
| WalletTopup | custom/  | —                     | amounts, onPay, currency |

d. Match against new component:

• Exact match: button.tsx exists → Component exists
• Similar name: Looking for icon-button → Found button → Suggest variant
• Functionality match: Looking for data-table → Found table → Suggest enhancement
• Semantic similarity: Compare name AND description against capability map to catch non-obvious overlaps

2. Variant vs New Component Decision

Use this decision tree informed by the Capability Map:

Create a VARIANT when:

• Component differs only in visual style (colors, sizes)
• Component shares same structure and behavior
• Component uses same props interface
• The Capability Map shows an existing component with matching variants/props
• Example: button with variant="icon" instead of new icon-button

Create a COMPOSITION when:

• New component combines multiple existing components
• The Capability Map shows several components that together form the new one
• Example: user-settings-form composes form-modal + text-field + select-field + switch

Create a NEW COMPONENT when:

• Component has different structure or behavior
• Component needs different props interface
• Component serves different purpose
• No existing component in the Capability Map covers its functionality
• Example: avatar is different from badge despite both being circular

Recommendation pattern:

Found existing component: `button` at src/components/ui/button.tsx

Capability Map excerpt:
| Component | Variants | Key Props |
|-----------|----------|-----------|
| Button | default, primary, secondary, destructive, outline, ghost, link | onClick, disabled, loading, leftIcon |

Analysis:
- Your "icon-button" differs only in having no text and centered icon
- It shares the same purpose (clickable action)
- It can use the same props (onClick, disabled, etc.)

Recommendation: Add a variant to `button` instead:

variant: {
  default: "...",
  primary: "...",
  icon: "h-10 w-10 p-0 justify-center items-center",  // NEW
}

This maintains consistency and reduces code duplication.

3. Subcomponent Identification

Analyze the component requirements and identify which existing components can be reused:

Form Components:

Requirement: "A form with name and email inputs"

Identified subcomponents:
✓ text-field (for name input with label)
✓ text-field (for email input with validation)
✓ button (for submit action)
✓ form-modal (if in a dialog)
✓ alert (for error messages)

Architecture:
- Composite component using existing primitives
- No need to create custom input components

Data Display Components:

Requirement: "A user profile card"

Identified subcomponents:
✓ typography (for name, role, description)
✓ badge (for status indicator)
✓ button (for action buttons)
✓ avatar (if available, else suggest creating)

Architecture:
- Container component with composition
- Uses existing UI primitives

Overlay Components:

Requirement: "A confirmation dialog with form"

Identified subcomponents:
✓ form-modal (provides dialog + form layout)
✓ text-field (for input fields)
✓ button (already included in form-modal)

Architecture:
- Use form-modal as base
- Add custom content inside

4. Component Category Detection

Determine the appropriate category for components.yaml:

5. Dependency Analysis

Identify all dependencies for the component:

External dependencies:

dependencies:
  - "class-variance-authority"  # If using CVA
  - "clsx"  # If using cn()
  - "tailwind-merge"  # If using cn()
  - "lucide-react"  # If using icons
  - "@radix-ui/react-dialog@^1.1.15"  # If using Dialog
  - "@radix-ui/react-select@^2.2.6"  # If using Select

Internal dependencies (other components):

internalDependencies:
  - button  # If using Button component
  - input  # If using Input component
  - dialog  # If using Dialog component

6. Multi-File Structure Detection

Determine if component needs multiple files:

Single file components:

• Simple primitives (Button, Badge, Input)
• No internal state management
• No complex sub-structures

Multi-file components:

• Complex components with subcomponents (EventSelector, KeyValueInput)
• Shared types across files
• Multiple related components that work together

Multi-file structure:

src/components/custom/component-name/
├── component-name.tsx          # Main component (exported)
├── component-subpart.tsx       # Internal subcomponent
├── types.ts                    # Shared types
├── utils.ts                    # Helper functions
└── index.ts                    # Public exports

Analysis Output Format

Provide analysis in this structured format:

# Component Analysis: [ComponentName]

## Existence Check
- ❌ Component does not exist
- ✅ Similar component found: `button` at src/components/ui/button.tsx

## Recommendation
[CREATE VARIANT / CREATE NEW COMPONENT]

**Reasoning:**
[Explanation of decision]

## Identified Subcomponents

| Component | Location | Usage |
|-----------|----------|-------|
| text-field | src/components/ui/text-field.tsx | For labeled input fields |
| button | src/components/ui/button.tsx | For submit action |
| alert | src/components/ui/alert.tsx | For validation errors |

## Component Details

**Type:** [UI / Custom]
**Category:** [core / form / data / overlay / feedback / layout]
**Structure:** [Single file / Multi-file]

**Dependencies:**
- External: class-variance-authority, clsx, tailwind-merge
- Internal: button, text-field, alert

## Suggested Architecture

// Main component using identified subcomponents import { Button } from "./button" import { TextField } from "./text-field" import { Alert } from "./alert"

const Component = () => { return ( <div> <TextField label="Name" /> <TextField label="Email" type="email" /> {error && <Alert variant="destructive">{error}</Alert>} <Button type="submit">Submit</Button> </div> ) }

## Next Steps

1. Confirm architecture with user
2. Gather design context (Figma or manual)
3. Map colors to CSS variables
4. Generate component files
5. Create tests and stories

Examples

Example 1: Suggest Variant

Input: User wants to create "outlined-button"

Analysis:

# Component Analysis: OutlinedButton

## Existence Check
✅ Found: `button` at src/components/ui/button.tsx

## Recommendation
CREATE VARIANT

**Reasoning:**
The existing `button` component already has an `outline` variant:

variant: { default: "bg-primary text-primary-foreground", outline: "border border-input bg-background", // Already exists! // ... }

**Action:** Use existing `<Button variant="outline">` instead of creating new component.

Example 2: Create New Component

Input: User wants to create "avatar" component

Analysis:

# Component Analysis: Avatar

## Existence Check
❌ Component does not exist
✅ Similar: `badge` (circular shape) at src/components/ui/badge.tsx

## Recommendation
CREATE NEW COMPONENT

**Reasoning:**
While `badge` is circular, `avatar` serves a different purpose:
- Avatar displays user images with fallback
- Badge shows status indicators
- Different props (src, alt, fallback vs children)
- Different behavior (image loading vs static content)

## Identified Subcomponents
None - This is a primitive component

## Component Details
**Type:** UI
**Category:** core
**Structure:** Single file

**Dependencies:**
- External: class-variance-authority, clsx, tailwind-merge
- Internal: None

## Suggested Architecture

const avatarVariants = cva( "relative flex shrink-0 overflow-hidden rounded-full", { variants: { size: { xs: "h-6 w-6", sm: "h-8 w-8", md: "h-10 w-10", lg: "h-12 w-12", xl: "h-16 w-16", }, }, defaultVariants: { size: "md" }, } )

interface AvatarProps { src?: string alt?: string fallback?: string size?: "xs" | "sm" | "md" | "lg" | "xl" }

Example 3: Identify Subcomponents

Input: User wants to create "user-settings-form"

Analysis:

# Component Analysis: UserSettingsForm

## Existence Check
❌ Component does not exist

## Recommendation
CREATE NEW COMPONENT (Custom)

**Reasoning:**
This is an application-specific form, not a reusable primitive.
Should be created in `src/components/custom/`.

## Identified Subcomponents

| Component | Location | Usage |
|-----------|----------|-------|
| form-modal | src/components/ui/form-modal.tsx | Modal wrapper with save/cancel |
| text-field | src/components/ui/text-field.tsx | Name, email, phone inputs |
| select-field | src/components/ui/select-field.tsx | Timezone, language selects |
| switch | src/components/ui/switch.tsx | Notification toggles |
| button | src/components/ui/button.tsx | Included in form-modal |
| alert | src/components/ui/alert.tsx | Error/success messages |

## Component Details
**Type:** Custom
**Category:** custom
**Structure:** Single file (uses composition)

**Dependencies:**
- External: clsx, tailwind-merge
- Internal: form-modal, text-field, select-field, switch, alert

## Suggested Architecture

import { FormModal } from "@/components/ui/form-modal" import { TextField } from "@/components/ui/text-field" import { SelectField } from "@/components/ui/select-field" import { Switch } from "@/components/ui/switch" import { Alert } from "@/components/ui/alert"

const UserSettingsForm = ({ open, onOpenChange }) => { return ( <FormModal open={open} onOpenChange={onOpenChange} title="User Settings" onSave={handleSave} > <TextField label="Name" /> <TextField label="Email" type="email" /> <SelectField label="Timezone" options={timezones} /> <Switch label="Email notifications" /> {error && <Alert variant="destructive">{error}</Alert>} </FormModal> ) }

Best Practices

1. Always search before suggesting creation - Avoid duplication
2. Prefer variants over new components - Maintain consistency
3. Identify ALL reusable subcomponents - Don't reinvent the wheel
4. Consider component category - Organize properly
5. Analyze dependencies - Keep dependency tree clean
6. Suggest multi-file structure when needed - For complex components

Error Handling

• No similar component found → Safe to create new component
• Multiple similar components → Present options to user
• Unclear if variant or new → Ask user for clarification
• Missing dependency → Note in analysis and suggest adding

This skill ensures component library consistency, prevents duplication, and promotes proper architecture patterns.