Visual Regression

{
  "framework": "react",
  "storybook_version": "7.6.0",
  "vr_tool": "chromatic",
  "ci_platform": "github",
  "component": {
    "path": "src/components/ProfileCard.tsx",
    "name": "ProfileCard",
    "props": [...],
    "valid": true
  },
  "dependencies": {
    "installed": ["@storybook/react", "@storybook/addon-essentials"],
    "missing": ["chromatic", "@chromatic-com/storybook"]
  }
}

import type { Meta, StoryObj } from '@storybook/react';
import { ProfileCard } from './ProfileCard';

const meta = {
  title: 'Components/ProfileCard',
  component: ProfileCard,
  parameters: {
    layout: 'centered',
  },
  tags: ['autodocs'],
  argTypes: {
    size: { control: 'select', options: ['sm', 'md', 'lg'] },
    variant: { control: 'select', options: ['default', 'compact'] },
  },
} satisfies Meta<typeof ProfileCard>;

export default meta;
type Story = StoryObj<typeof meta>;

export const Default: Story = {
  args: {
    name: 'John Doe',
    avatar: 'https://example.com/avatar.jpg',
    bio: 'Software Engineer',
    size: 'md',
    variant: 'default',
  },
};

export const Small: Story = {
  args: {
    ...Default.args,
    size: 'sm',
  },
};

export const Large: Story = {
  args: {
    ...Default.args,
    size: 'lg',
  },
};

export const Compact: Story = {
  args: {
    ...Default.args,
    variant: 'compact',
  },
};

// Accessibility test
Default.parameters = {
  a11y: {
    config: {
      rules: [
        { id: 'color-contrast', enabled: true },
        { id: 'label', enabled: true },
      ],
    },
  },
};

{
  "projectId": "<PROJECT_ID_PLACEHOLDER>",
  "buildScriptName": "build-storybook",
  "exitZeroOnChanges": true,
  "exitOnceUploaded": true,
  "onlyChanged": true,
  "externals": ["public/**"],
  "skip": "dependabot/**",
  "ignoreLastBuildOnBranch": "main"
}

module.exports = {
  stories: ['../src/**/*.stories.@(js|jsx|ts|tsx)'],
  addons: [
    '@storybook/addon-links',
    '@storybook/addon-essentials',
    '@chromatic-com/storybook', // ← Added
    '@storybook/addon-interactions',
  ],
  framework: {
    name: '@storybook/react-vite',
    options: {},
  },
};

{
  "scripts": {
    "chromatic": "npx chromatic",
    "chromatic:ci": "npx chromatic --exit-zero-on-changes"
  }
}

name: Visual Regression Tests

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]

jobs:
  chromatic:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0 # Required for Chromatic

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Run Chromatic
        uses: chromaui/action@latest
        with:
          projectToken: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
          exitZeroOnChanges: true
          onlyChanged: true

✅ Visual regression testing setup complete!

## Files Created/Modified

✅ {ComponentName}.stories.tsx (Storybook story with variants)
✅ chromatic.config.json (Chromatic configuration)
✅ .storybook/main.js (Added @chromatic-com/storybook addon)
✅ package.json (Added chromatic scripts)
✅ .github/workflows/chromatic.yml (CI workflow)

## Next Steps

### 1. Install Dependencies

```bash
npm install --save-dev chromatic @chromatic-com/storybook
```

### 2. Create Chromatic Project

1. Go to https://www.chromatic.com/start
2. Sign in with GitHub
3. Create new project
4. Copy project token

### 3. Add Secret to GitHub

1. Go to repository Settings → Secrets and variables → Actions
2. Create secret: `CHROMATIC_PROJECT_TOKEN`
3. Paste your project token

### 4. Update chromatic.config.json

Replace `<PROJECT_ID_PLACEHOLDER>` with your actual project ID from Chromatic dashboard.

### 5. Create Baseline

```bash
npm run chromatic
```

This captures the initial screenshots as your baseline.

### 6. Test Visual Regression

1. Make a visual change to ProfileCard
2. Commit and push
3. CI will run Chromatic automatically
4. Review changes in Chromatic dashboard

## Documentation

See `.agent/sops/testing/visual-regression-setup.md` for detailed workflow.

## Troubleshooting

**Storybook build fails**: Ensure all component dependencies are installed
**Chromatic upload fails**: Check project token in secrets
**No changes detected**: Chromatic only runs on changed stories (use `--force-rebuild` to test)

def detect_storybook_config(project_root: str) -> dict
def detect_vr_tool(project_root: str) -> str
def validate_component_path(component_path: str) -> dict
def check_dependencies(project_root: str) -> dict

def analyze_component(component_path: str, framework: str) -> dict
def generate_story(component_info: dict, template_path: str) -> str
def create_accessibility_tests(component_info: dict) -> str
def create_interaction_tests(component_info: dict) -> str

def generate_chromatic_config(project_info: dict) -> str
def generate_storybook_config(existing_config: dict) -> str
def generate_package_scripts(existing_scripts: dict) -> dict
def generate_percy_config(project_info: dict) -> str  # Percy alternative
def generate_backstop_config(project_info: dict) -> str  # BackstopJS alternative

def detect_ci_platform(project_root: str) -> str
def generate_github_workflow(project_info: dict) -> str
def generate_gitlab_ci(project_info: dict) -> str
def generate_circleci_config(project_info: dict) -> str