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docs: create comprehensive README for widget with accurate technical details
- Complete feature overview (text chat, voice calls, error handling) - Architecture documentation with Mermaid diagram - API integration details and WebSocket events - Configuration options and programmatic usage - Development workflow and build process - Performance, security, and deployment guidance - .gitignore: allow widget/README.md to be tracked
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!widget/README.md
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LICENSE

‎widget/README.md‎

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# 🤖 Syntera Embeddable Widget
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**Production-ready AI chat widget for website integration with real-time voice calls and comprehensive error handling.**
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## Overview
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The Syntera widget is a standalone, embeddable TypeScript application that provides AI-powered customer support directly on any website. It features real-time text chat, voice calls via LiveKit, WebSocket connectivity, and enterprise-grade error handling.
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**Technology**: TypeScript, Vite, LiveKit WebRTC, Socket.io
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**Bundle Size**: ~200KB gzipped
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**Browser Support**: Modern browsers with WebRTC support
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## Core Features
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### 💬 **Real-time Text Chat**
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- **WebSocket connectivity** - Persistent connections with automatic reconnection
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- **Message threading** - Conversation organization and context management
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- **Typing indicators** - Real-time user feedback
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- **Message history** - Persistent conversation storage
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- **File attachments** - Support for document uploads
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### 🎤 **Voice Call Integration**
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- **LiveKit WebRTC** - Low-latency voice communication
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- **Audio streaming** - Real-time bidirectional audio
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- **Call controls** - Mute/unmute, volume controls
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- **Connection resilience** - Automatic reconnection on network issues
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- **Background noise handling** - Audio quality optimization
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### 🎨 **Advanced UI/UX**
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- **Floating widget button** - Customizable position and styling
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- **Responsive design** - Mobile-optimized interface
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- **Dark/light themes** - Automatic theme detection
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- **Accessibility** - Keyboard navigation and screen reader support
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- **Emoji picker** - Rich text input with emoji support
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### 🛡️ **Enterprise Features**
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- **Error handling** - Comprehensive error banners and recovery
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- **GDPR compliance** - Consent management and data protection
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- **Sentry integration** - Error tracking and monitoring
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- **Rate limiting** - API abuse prevention
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- **Audit logging** - Security event tracking
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## Architecture
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### Widget Structure
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```
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widget/
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├── src/
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│ ├── index.ts # Auto-initialization from script tag
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│ ├── widget.ts # Main SynteraWidget class
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│ ├── types.ts # TypeScript interfaces
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│ ├── styles.css # Widget styling
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│ ├── api/
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│ │ ├── client.ts # HTTP API client (REST endpoints)
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│ │ ├── websocket.ts # WebSocket client (real-time events)
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│ │ └── livekit.ts # LiveKit client (voice calls)
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│ ├── ui/
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│ │ ├── chat-interface.ts # Complete chat UI component
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│ │ └── gdpr-consent.ts # GDPR consent modal
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│ └── utils/
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│ ├── logger.ts # Structured logging
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│ ├── sentry.ts # Error tracking
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│ └── icons.ts # SVG icon components
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├── dist/
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│ ├── widget.iife.js # UMD bundle for browsers
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│ ├── widget.css # Compiled styles
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│ └── *.d.ts # TypeScript declarations
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└── test.html # Development testing page
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```
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### Component Architecture
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#### **SynteraWidget Class**
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Main orchestrator handling initialization, configuration, and lifecycle management:
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```typescript
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class SynteraWidget {
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async init(): Promise<void> {
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// Load agent configuration
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// Initialize API clients
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// Create UI components
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// Setup error handling
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}
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async startChat(): Promise<void> {
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// Create conversation
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// Initialize WebSocket connection
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// Render chat interface
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}
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async startVoiceCall(): Promise<void> {
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// Get LiveKit token
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// Initialize voice connection
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// Handle audio streaming
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}
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}
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```
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#### **ChatInterface Component**
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Complete chat UI with message handling, typing indicators, and voice controls:
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```typescript
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class ChatInterface {
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private createMessageBubble(message: Message): HTMLElement {
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// Render message with timestamp
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// Add reaction capabilities
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// Handle file attachments
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}
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private handleVoiceCall(): void {
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// Initialize LiveKit connection
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// Setup audio streaming
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// Update UI state
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}
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}
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```
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## API Integration
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### Required Endpoints
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The widget communicates with Syntera's backend services:
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| Endpoint | Method | Purpose |
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|----------|--------|---------|
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| `/api/public/agents/:id` | GET | Fetch agent configuration |
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| `/api/public/conversations` | POST | Create new conversation |
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| `/api/public/messages` | POST | Send chat messages |
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| `/api/public/livekit/token` | POST | Get voice call tokens |
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| `/api/public/websocket/config` | POST | Get WebSocket configuration |
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### Real-time Events (WebSocket)
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```
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Client → Server:
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├── message:send # Send chat message
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├── typing:start # Show typing indicator
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├── call:start # Initiate voice call
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└── conversation:join # Join conversation room
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Server → Client:
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├── message:new # New message received
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├── typing:update # Typing status changes
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├── call:status # Voice call status updates
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└── error # Error notifications
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```
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## Configuration & Initialization
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### Script Tag Integration
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```html
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<script src="https://cdn.syntera.com/widget.iife.js"
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data-agent-id="agent-123"
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data-api-key="pub_key_abc"
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data-api-url="https://api.syntera.com"
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data-position="bottom-right"
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data-theme="auto"
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data-debug="false">
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</script>
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```
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### Configuration Options
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| Attribute | Required | Default | Description |
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|-----------|----------|---------|-------------|
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| `data-agent-id` | ✅ Yes | - | Syntera agent identifier |
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| `data-api-key` | ✅ Yes | - | Public API key for authentication |
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| `data-api-url` | ❌ No | `https://api.syntera.com` | Backend API base URL |
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| `data-position` | ❌ No | `bottom-right` | Widget position: `bottom-right`, `bottom-left`, `top-right`, `top-left` |
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| `data-theme` | ❌ No | `auto` | Theme: `light`, `dark`, `auto` |
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| `data-debug` | ❌ No | `false` | Enable debug logging |
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### Programmatic Usage
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```typescript
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import { SynteraWidget } from '@syntera/widget'
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const widget = new SynteraWidget({
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agentId: 'agent-123',
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apiKey: 'pub_key_abc',
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apiUrl: 'https://api.syntera.com',
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position: 'bottom-right',
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theme: 'auto',
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sentryDsn: 'https://sentry-dsn', // Optional
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})
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// Initialize widget
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await widget.init()
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// Programmatic control
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widget.open() // Show chat
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widget.close() // Hide chat
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await widget.sendMessage('Hello!')
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```
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## Development & Building
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### Local Development
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```bash
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cd widget
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# Install dependencies
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pnpm install
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# Development server with hot reload
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pnpm dev
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# Build for production
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pnpm build
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# Type checking
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pnpm type-check
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```
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### Build Output
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```bash
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dist/
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├── widget.iife.js # UMD bundle (~200KB)
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├── widget.css # Styles (~15KB)
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├── widget.d.ts # TypeScript declarations
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└── *.d.ts.map # Source maps
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```
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### Testing
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```bash
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# Open test page in browser
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open test.html
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# Or serve locally
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python -m http.server 8000
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# Visit http://localhost:8000/test.html
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```
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## Error Handling & Monitoring
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### Error Recovery
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- **Connection failures** - Automatic reconnection with exponential backoff
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- **API errors** - User-friendly error messages with retry options
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- **Audio issues** - Fallback to text-only mode
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- **Network interruptions** - State preservation and recovery
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### Monitoring Integration
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```typescript
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// Sentry error tracking
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if (config.sentryDsn) {
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initSentry({
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dsn: config.sentryDsn,
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environment: 'production',
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agentId: config.agentId,
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})
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}
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// Structured logging
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logger.info('Widget initialized', {
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agentId: config.agentId,
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theme: config.theme,
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userAgent: navigator.userAgent
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})
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```
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## Browser Compatibility
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### Supported Browsers
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- **Chrome/Edge**: 88+ (WebRTC support)
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- **Firefox**: 87+ (WebRTC support)
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- **Safari**: 14+ (WebRTC support)
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- **Mobile Safari**: iOS 14.5+
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- **Chrome Android**: 88+
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### Feature Detection
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The widget automatically detects and adapts to browser capabilities:
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- **WebRTC support** - Falls back to text-only if unavailable
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- **WebSocket support** - Graceful degradation for older browsers
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- **CSS Grid/Flexbox** - Progressive enhancement for layouts
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## Performance Optimization
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### Bundle Optimization
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- **Tree shaking** - Unused code elimination
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- **Code splitting** - Lazy loading of non-critical features
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- **Compression** - Gzip/Brotli compression
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- **Caching** - Aggressive caching headers
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### Runtime Performance
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- **Virtual scrolling** - Efficient message list rendering
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- **Debounced inputs** - Reduced API calls during typing
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- **Memory management** - Automatic cleanup of event listeners
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- **Image optimization** - Lazy loading and responsive images
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## Security Considerations
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### Data Protection
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- **HTTPS only** - Secure connections for all communications
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- **API key rotation** - Regular credential updates
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- **Input sanitization** - XSS prevention and validation
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- **Session isolation** - No cross-conversation data leakage
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### Privacy Compliance
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- **GDPR consent** - User permission for data collection
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- **Data minimization** - Only necessary data collection
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- **Right to erasure** - User data deletion capabilities
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- **Audit trails** - Complete activity logging
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## Deployment & Hosting
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### CDN Deployment
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```bash
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# Build production bundle
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pnpm build
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# Upload to CDN
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aws s3 cp dist/ s3://cdn.syntera.com/widget/ --recursive
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# CDN URL: https://cdn.syntera.com/widget/widget.iife.js
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```
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### Version Management
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- **Semantic versioning** - Major.minor.patch releases
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- **Changelog maintenance** - Feature and bug fix documentation
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- **Backwards compatibility** - API stability guarantees
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- **Deprecation notices** - Advance warning for breaking changes
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---
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**Enterprise-grade embeddable AI chat widget with voice capabilities and comprehensive error handling.**
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