jedmund-svelte/prd/PRD-storybook-integration.md

# Product Requirements Document: Storybook Integration

## Overview

Implement Storybook as our component development and documentation platform to improve development workflow, component testing, and design system consistency across the jedmund-svelte project.

## Goals

- **Isolated Component Development**: Build and test components in isolation from business logic
- **Visual Documentation**: Create a living style guide for all UI components
- **Design System Consistency**: Ensure consistent component behavior across different states
- **Developer Experience**: Improve development workflow with hot reloading and component playground
- **Quality Assurance**: Test component edge cases and various prop combinations
- **Team Collaboration**: Provide a central place for designers and developers to review components

## Current State Analysis

### ✅ What We Have

- Comprehensive admin UI component library (Button, Input, Modal, etc.)
- Media Library components (MediaLibraryModal, ImagePicker, GalleryManager, etc.)
- SCSS-based styling system with global variables
- SvelteKit project with Svelte 5 runes mode
- TypeScript configuration
- Vite build system

### 🎯 What We Need

- Storybook installation and configuration
- Stories for existing components
- Visual regression testing setup
- Component documentation standards
- Integration with existing SCSS variables and themes

## Technical Requirements

### 1. Storybook Installation

**Installation Method**: Manual setup (not template-based since we have an existing project)

```bash
# Install Storybook CLI and initialize
npx storybook@latest init

# Or manual installation for better control
npm install --save-dev @storybook/svelte-vite @storybook/addon-essentials
```

**Expected File Structure**:

```
.storybook/
├── main.js           # Storybook configuration
├── preview.js        # Global decorators and parameters
└── manager.js        # Storybook UI customization

src/
├── stories/          # Component stories
│   ├── Button.stories.js
│   ├── Input.stories.js
│   └── ...
└── components/       # Existing components
```

### 2. Configuration Requirements

#### Main Configuration (.storybook/main.js)

```javascript
export default {
	stories: ['../src/**/*.stories.@(js|jsx|ts|tsx|svelte)'],
	addons: [
		'@storybook/addon-essentials', // Controls, actions, viewport, etc.
		'@storybook/addon-svelte-csf', // Svelte Component Story Format
		'@storybook/addon-a11y', // Accessibility testing
		'@storybook/addon-design-tokens' // Design system tokens
	],
	framework: {
		name: '@storybook/svelte-vite',
		options: {}
	},
	viteFinal: async (config) => {
		// Integrate with existing Vite config
		// Import SCSS variables and aliases
		return mergeConfig(config, {
			resolve: {
				alias: {
					$lib: path.resolve('./src/lib'),
					$components: path.resolve('./src/lib/components'),
					$icons: path.resolve('./src/assets/icons'),
					$illos: path.resolve('./src/assets/illos')
				}
			},
			css: {
				preprocessorOptions: {
					scss: {
						additionalData: `
              @import './src/assets/styles/variables.scss';
              @import './src/assets/styles/fonts.scss';
              @import './src/assets/styles/themes.scss';
              @import './src/assets/styles/globals.scss';
            `
					}
				}
			}
		})
	}
}
```

#### Preview Configuration (.storybook/preview.js)

```javascript
import '../src/assets/styles/reset.css'
import '../src/assets/styles/globals.scss'

export const parameters = {
	actions: { argTypesRegex: '^on[A-Z].*' },
	controls: {
		matchers: {
			color: /(background|color)$/i,
			date: /Date$/
		}
	},
	backgrounds: {
		default: 'light',
		values: [
			{ name: 'light', value: '#ffffff' },
			{ name: 'dark', value: '#333333' },
			{ name: 'admin', value: '#f5f5f5' }
		]
	},
	viewport: {
		viewports: {
			mobile: { name: 'Mobile', styles: { width: '375px', height: '667px' } },
			tablet: { name: 'Tablet', styles: { width: '768px', height: '1024px' } },
			desktop: { name: 'Desktop', styles: { width: '1440px', height: '900px' } }
		}
	}
}
```

### 3. Component Story Standards

#### Story File Format

Each component should have a corresponding `.stories.js` file following this structure:

```javascript
// Button.stories.js
import Button from '../lib/components/admin/Button.svelte'

export default {
	title: 'Admin/Button',
	component: Button,
	tags: ['autodocs'],
	argTypes: {
		variant: {
			control: { type: 'select' },
			options: ['primary', 'secondary', 'ghost', 'danger']
		},
		size: {
			control: { type: 'select' },
			options: ['small', 'medium', 'large']
		},
		disabled: {
			control: 'boolean'
		},
		onclick: { action: 'clicked' }
	}
}

export const Primary = {
	args: {
		variant: 'primary',
		children: 'Primary Button'
	}
}

export const Secondary = {
	args: {
		variant: 'secondary',
		children: 'Secondary Button'
	}
}

export const AllVariants = {
	render: () => ({
		Component: ButtonShowcase,
		props: {}
	})
}
```

#### Story Organization

```
src/stories/
├── admin/              # Admin interface components
│   ├── Button.stories.js
│   ├── Input.stories.js
│   ├── Modal.stories.js
│   └── forms/          # Form-specific components
│       ├── MediaInput.stories.js
│       ├── ImagePicker.stories.js
│       └── GalleryManager.stories.js
├── public/             # Public-facing components
│   ├── Header.stories.js
│   └── Footer.stories.js
└── examples/           # Complex examples and compositions
    ├── AdminDashboard.stories.js
    └── MediaLibraryFlow.stories.js
```

## Implementation Plan

### Phase 1: Initial Setup (1-2 days)

1. **Install and Configure Storybook**

   - Run `npx storybook@latest init`
   - Configure Vite integration for SCSS and aliases
   - Set up TypeScript support
   - Configure preview with global styles

2. **Test Basic Setup**
   - Create simple Button story
   - Verify SCSS variables work
   - Test hot reloading

### Phase 2: Core Component Stories (3-4 days)

1. **Basic UI Components**

   - Button (all variants, states, sizes)
   - Input (text, textarea, validation states)
   - Modal (different sizes, content types)
   - LoadingSpinner (different sizes)

2. **Form Components**

   - MediaInput (single/multiple modes)
   - ImagePicker (different aspect ratios)
   - GalleryManager (with/without items)

3. **Complex Components**
   - MediaLibraryModal (with mock data)
   - DataTable (with sample data)
   - AdminNavBar (active states)

### Phase 3: Advanced Features (2-3 days)

1. **Mock Data Setup**

   - Create mock Media objects
   - Set up API mocking for components that need data
   - Create realistic test scenarios

2. **Accessibility Testing**

   - Add @storybook/addon-a11y
   - Test keyboard navigation
   - Verify screen reader compatibility

3. **Visual Regression Testing**
   - Set up Chromatic (optional)
   - Create baseline screenshots
   - Configure CI integration

### Phase 4: Documentation and Polish (1-2 days)

1. **Component Documentation**

   - Add JSDoc comments to components
   - Create usage examples
   - Document props and events

2. **Design System Documentation**
   - Color palette showcase
   - Typography scale
   - Spacing system
   - Icon library

## Success Criteria

### Functional Requirements

- [ ] Storybook runs successfully with `npm run storybook`
- [ ] All existing components have basic stories
- [ ] SCSS variables and global styles work correctly
- [ ] Components render properly in isolation
- [ ] Hot reloading works for both component and story changes
- [ ] TypeScript support is fully functional

### Quality Requirements

- [ ] Stories cover all major component variants
- [ ] Interactive controls work for all props
- [ ] Actions are properly logged for events
- [ ] Accessibility addon reports no critical issues
- [ ] Components are responsive across viewport sizes

### Developer Experience Requirements

- [ ] Story creation is straightforward and documented
- [ ] Mock data is easily accessible and realistic
- [ ] Component API is clearly documented
- [ ] Common patterns have reusable templates

## Integration with Existing Workflow

### Development Workflow

1. **Component Development**: Start new components in Storybook
2. **Testing**: Test all states and edge cases in stories
3. **Documentation**: Stories serve as living documentation
4. **Review**: Use Storybook for design/code reviews

### Project Structure Integration

```
package.json           # Add storybook scripts
├── "storybook": "storybook dev -p 6006"
├── "build-storybook": "storybook build"

.storybook/           # Storybook configuration
src/
├── lib/components/   # Existing components (unchanged)
├── stories/          # New: component stories
└── assets/styles/    # Existing styles (used by Storybook)
```

### Scripts and Commands

```json
{
	"scripts": {
		"dev": "vite dev",
		"storybook": "storybook dev -p 6006",
		"build-storybook": "storybook build",
		"storybook:test": "test-storybook"
	}
}
```

## Technical Considerations

### SCSS Integration

- Import global variables in Storybook preview
- Ensure component styles render correctly
- Test responsive breakpoints

### SvelteKit Compatibility

- Handle SvelteKit-specific imports (like `$app/stores`)
- Mock SvelteKit modules when needed
- Ensure aliases work in Storybook context

### TypeScript Support

- Configure proper type checking
- Use TypeScript for story definitions where beneficial
- Ensure IntelliSense works for story arguments

### Performance

- Optimize bundle size for faster story loading
- Use lazy loading for large story collections
- Configure appropriate caching

## Future Enhancements

### Advanced Testing

- **Visual Regression Testing**: Use Chromatic for automated visual testing
- **Interaction Testing**: Add @storybook/addon-interactions for user flow testing
- **Accessibility Automation**: Automated a11y testing in CI/CD

### Design System Evolution

- **Design Tokens**: Implement design tokens addon
- **Figma Integration**: Connect with Figma designs
- **Component Status**: Track component implementation status

### Collaboration Features

- **Published Storybook**: Deploy Storybook for team access
- **Design Review Process**: Use Storybook for design approvals
- **Documentation Site**: Evolve into full design system documentation

## Risks and Mitigation

### Technical Risks

- **Build Conflicts**: Vite configuration conflicts
  - _Mitigation_: Careful configuration merging and testing
- **SCSS Import Issues**: Global styles not loading
  - _Mitigation_: Test SCSS integration early in setup

### Workflow Risks

- **Adoption Resistance**: Team not using Storybook
  - _Mitigation_: Start with high-value components, show immediate benefits
- **Maintenance Overhead**: Stories become outdated
  - _Mitigation_: Include story updates in component change process

## Success Metrics

### Development Efficiency

- Reduced time to develop new components
- Faster iteration on component designs
- Fewer bugs in component edge cases

### Code Quality

- Better component API consistency
- Improved accessibility compliance
- More comprehensive component testing

### Team Collaboration

- Faster design review cycles
- Better communication between design and development
- More consistent component usage across the application

## Conclusion

Implementing Storybook will significantly improve our component development workflow, provide better documentation, and create a foundation for a mature design system. The investment in setup and story creation will pay dividends in development speed, component quality, and team collaboration.

The implementation should be done incrementally, starting with the most commonly used components and gradually expanding coverage. This approach minimizes risk while providing immediate value to the development process.