👁️ Preview Mode Skill

name: preview-mode description: Preview changes before deploying, visual diff comparison, and safe testing environments

🎯 Purpose

Enable safe preview of changes before committing or deploying, reducing risk of breaking production.

📋 When to Use

• Before deploying to production
• Testing UI changes
• Reviewing code changes
• Demonstrating features to stakeholders

🔧 Preview Methods

1. Local Development Server

# Vite
npm run dev

# Next.js
npm run dev

# Create React App
npm start

# Static files
npx serve .

2. Browser Preview

// Use browser_subagent to:
// 1. Navigate to localhost
// 2. Take screenshots
// 3. Record interactions

3. Build Preview

# Build and preview production bundle
npm run build
npm run preview  # Vite
npx serve out    # Next.js static

📸 Screenshot Comparison

Before/After Workflow

1. Take BEFORE screenshot
2. Make changes
3. Take AFTER screenshot
4. Compare side-by-side
5. Document differences

Visual Diff Tools

# Using browser automation
browser_subagent → capture screenshot
compare_images → detect differences

🎬 Recording Previews

Browser Recording

// Recording name convention
recording_name: "{feature}_preview"

// Example
"login_flow_preview"
"dashboard_changes_preview"
"mobile_responsive_preview"

🌐 Preview Environments

📝 Preview Checklist

Before Preview

• All tests passing
• No console errors
• Build completes successfully
• Dependencies up to date

During Preview

• Check all pages/routes
• Test responsive layouts
• Verify interactive elements
• Check dark mode (if applicable)
• Test error states

After Preview

• Document issues found
• Take screenshots for record
• Get stakeholder approval
• Proceed to next stage

🔄 Preview Workflow

Code Changes
     │
     ▼
┌─────────────┐
│ Local Test  │ ─── npm run dev
└─────────────┘
     │
     ▼
┌─────────────┐
│ Build       │ ─── npm run build
└─────────────┘
     │
     ▼
┌─────────────┐
│ Preview     │ ─── npm run preview
└─────────────┘
     │
     ▼
┌─────────────┐
│ Screenshot  │ ─── browser_subagent
└─────────────┘
     │
     ▼
   Deploy ✅

🔗 Related Skills

• browser-automation - Automated previews
• testing - Run tests before preview
• deployment - Deploy after preview approval