@tyroneross/interface-built-right

interface-built-right

Visual regression testing for Claude Code. Capture baselines, compare changes, iterate automatically.

Quick Start

# 1. Install
npm install github:tyroneross/interface-built-right

# 2. Capture baseline of your app
npx ibr start http://localhost:3000/dashboard --name my-feature

# 3. Make UI changes...

# 4. Compare against baseline
npx ibr check

# 5. View visual diff in browser
npx ibr serve

Installation

From GitHub:

npm install github:tyroneross/interface-built-right

From local path:

npm install /path/to/interface-built-right

After install, verify it works:

npx ibr --help

CLI Commands

Command	Description
npx ibr start <url>	Capture baseline screenshot
npx ibr check [sessionId]	Compare current state against baseline
npx ibr serve	Open web UI at localhost:4242
npx ibr list	List all sessions
npx ibr update [sessionId]	Update baseline with current screenshot
npx ibr clean --older-than 7d	Clean old sessions
npx ibr login <url>	Save auth state for protected pages
npx ibr logout	Clear saved auth state

Workflow Example

# 1. Start your app
cd my-app && npm run dev  # → localhost:3000

# 2. Capture baseline before making changes
npx ibr start http://localhost:3000/settings --name settings-redesign
# → Session started: sess_Hk8mN2pQ

# 3. Make your UI changes (edit components, styles, etc.)

# 4. Compare against baseline
npx ibr check
# → Shows diff percentage and verdict

# 5. View in web UI
npx ibr serve
# → Opens http://localhost:4242 with side-by-side comparison

# 6. If changes look good, update baseline
npx ibr update

Authenticated Pages

For pages behind login:

# 1. Save auth state (opens browser for manual login)
npx ibr login http://localhost:3000/login
# → Log in manually, then close browser

# 2. Now captures will use your auth session
npx ibr start http://localhost:3000/dashboard
# → 🔐 Using saved authentication state

# 3. Clear auth when done
npx ibr logout

Security notes:

• Auth state is stored per-user (auth.{username}.json)
• 7-day expiration with auto-cleanup
• Blocked in CI/CD and deployed environments
• Add .ibr/ to your .gitignore

Claude Code Plugin

Add to your project's .claude/settings.json:

{
  "plugins": [
    "node_modules/interface-built-right/plugin"
  ]
}

Then restart Claude Code. You'll have these commands:

Command	Description
/ibr:ui	Launch web UI dashboard
/ibr:snapshot	Capture baseline (prompts for URL)
/ibr:compare	Compare against baseline

Programmatic API

import { InterfaceBuiltRight } from 'interface-built-right';

const ibr = new InterfaceBuiltRight({
  baseUrl: 'http://localhost:3000',
  outputDir: './.ibr',
  threshold: 1.0,  // % diff allowed
});

// Capture baseline
const { sessionId } = await ibr.startSession('/dashboard', {
  name: 'dashboard-update',
});

// After making changes, compare
const report = await ibr.check(sessionId);

console.log(report.analysis.verdict);
// → "MATCH" | "EXPECTED_CHANGE" | "UNEXPECTED_CHANGE" | "LAYOUT_BROKEN"

// Cleanup
await ibr.close();

Configuration

Create .ibrrc.json in your project root:

{
  "baseUrl": "http://localhost:3000",
  "outputDir": "./.ibr",
  "viewport": "desktop",
  "threshold": 1.0,
  "fullPage": true
}

Comparison Report

Reports are structured for Claude to read and act on:

{
  "sessionId": "sess_abc123",
  "comparison": {
    "match": false,
    "diffPercent": 8.2,
    "diffPixels": 6560
  },
  "analysis": {
    "verdict": "EXPECTED_CHANGE",
    "summary": "Header background changed. Layout intact."
  }
}

Verdicts:

• MATCH - No visual changes (within threshold)
• EXPECTED_CHANGE - Changes detected, appear intentional
• UNEXPECTED_CHANGE - Changes in unexpected areas
• LAYOUT_BROKEN - Significant structural issues

File Structure

Sessions are stored in .ibr/sessions/:

.ibr/
├── auth.{username}.json   # Auth state (per-user)
└── sessions/
    └── sess_abc123/
        ├── session.json   # Session metadata
        ├── baseline.png   # Original screenshot
        ├── current.png    # After-changes screenshot
        └── diff.png       # Visual diff

Troubleshooting

"Command not found: ibr"

# Use npx or run from source
npx ibr --help
# OR
npm run ibr -- --help

"Playwright browsers not installed"

npx playwright install chromium

"Auth state expired"

npx ibr login http://localhost:3000/login

"Session not found"

# List available sessions
npx ibr list

Requirements

• Node.js 18+
• Playwright (installed automatically)

License

MIT