FRE-600: Implement Phase 1 WebSocket + Yjs CRDT foundation
- Create TypeScript and Vite configuration for SolidJS - Implement Yjs document structure for screenplay collaboration - Build WebSocket connection manager with exponential backoff reconnection - Create CRDT document manager with undo/redo support - Set up WebSocket sync server with JWT authentication - Add SolidJS reactive bindings for Yjs shared types - Build collaborative editor component - Write unit tests for CRDT operations - Document implementation in analysis/fre600_websocket_foundation.md Architecture: Yjs chosen over Automerge for better ecosystem and Tauri compatibility. WebSocket for sync, WebRTC for video. Co-Authored-By: Paperclip <noreply@paperclip.ing>
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analysis/fre600_websocket_foundation.md
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analysis/fre600_websocket_foundation.md
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# FRE-600: WebSocket Foundation + Yjs CRDT Sync
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## Phase 1 Implementation Status
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### ✅ Completed Components
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#### 1. Core Infrastructure
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- **`tsconfig.json`** - TypeScript configuration with SolidJS support
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- **`vite.config.ts`** - Vite build configuration with WebSocket proxy
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- **`package.json`** - Dependencies and scripts
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#### 2. Yjs Document Structure (`src/lib/collaboration/yjs-document.ts`)
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- `createScreenplayDoc()` - Creates Yjs document with screenplay structure
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- `getOrCreateSharedTypes()` - Access to shared types (Text, Map)
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- Metadata, characters, and scenes management
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#### 3. WebSocket Connection Manager (`src/lib/collaboration/websocket-connection.ts`)
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- `WebSocketConnection` class implementing `WebSocketConnectionManager` interface
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- Automatic reconnection with exponential backoff
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- Connection status tracking (`connecting`, `connected`, `disconnected`, `reconnecting`)
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- JWT authentication support
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#### 4. CRDT Document Manager (`src/lib/collaboration/crdt-document.ts`)
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- `CRDTDocument` class implementing `CRDTDocumentManager` interface
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- Document lifecycle management
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- Undo/Redo stack integration
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- WebSocket provider coordination
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#### 5. WebSocket Server (`server/websocket/`)
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- **`server.ts`** - Core WebSocket server with Yjs sync protocol
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- Document state management
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- Client connection tracking
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- Message handling (sync, update)
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- JWT authentication middleware
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- **`index.ts`** - Server entry point with configuration
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#### 6. SolidJS Bindings (`src/lib/collaboration/solid-bindings.ts`)
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- `useYText()` - Reactive binding for Yjs Text
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- `useYMap()` - Reactive binding for Yjs Map
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- `useYArray()` - Reactive binding for Yjs Array
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- `useCollaborativeText()` - Collaborative editor binding
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- `useCollaborativeDoc()` - Full document binding
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#### 7. Collaborative Editor Component (`src/components/editor/collaborative-editor.tsx`)
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- `CollaborativeEditor` component
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- Real-time text synchronization
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- Cursor position preservation
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- Event handling for collaborative edits
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#### 8. Tests (`src/lib/collaboration/crdt-document.test.ts`)
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- Document creation tests
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- Text synchronization tests
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- Concurrent operations tests
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- Undo/Redo tests
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- Metadata management tests
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- Character and scene storage tests
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### 📋 Usage Example
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```typescript
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// Client-side initialization
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import { CRDTDocument } from './src/lib/collaboration/crdt-document';
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const docManager = new CRDTDocument();
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await docManager.initialize(
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'project-123',
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'ws://localhost:8080',
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'jwt-auth-token'
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);
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// Access the document
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const doc = await docManager.initialize(...);
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const text = doc.getText('main');
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text.insert(0, 'Hello, collaborative world!');
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// SolidJS integration
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import { useCollaborativeDoc } from './src/lib/collaboration/solid-bindings';
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function Editor() {
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const { text, metadata } = useCollaborativeDoc(doc);
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return (
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<CollaborativeEditor
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doc={doc}
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projectId="project-123"
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userId="user-456"
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/>
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);
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}
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```
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### 🚀 Running the Server
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```bash
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# Install dependencies
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npm install
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# Start development server
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npm run dev
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# Start WebSocket server
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npm run server:dev
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# Run tests
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npm test
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```
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### 📁 File Structure
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```
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src/
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├── lib/
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│ └── collaboration/
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│ ├── yjs-document.ts # Yjs document structure
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│ ├── websocket-connection.ts # WebSocket client
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│ ├── crdt-document.ts # CRDT manager
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│ ├── solid-bindings.ts # SolidJS reactive bindings
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│ └── crdt-document.test.ts # Unit tests
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└── components/
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└── editor/
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└── collaborative-editor.tsx # Collaborative editor component
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server/
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└── websocket/
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├── server.ts # WebSocket server implementation
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└── index.ts # Server entry point
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```
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### 🔧 Configuration
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#### Environment Variables
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```env
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# WebSocket Server
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WS_PORT=8080
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JWT_SECRET=your-secret-key
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ENABLE_AUTH=true
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# Client
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VITE_WS_URL=ws://localhost:8080
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```
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### ✅ Deliverables Met
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- [x] Two app instances can sync text changes via WebSocket
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- [x] Basic undo/redo functionality
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- [x] Connection status indicator
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- [x] Unit tests for CRDT operations
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### 📊 Next Steps (Phase 2)
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1. Implement `PresenceManager` with cursor tracking
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2. Set up Redis for presence state
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3. Create `CollaboratorList` component
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4. Implement remote cursor rendering
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5. Add user idle detection
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### 📝 Dependencies Status
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- **FRE-586** (Core editor): Needed for editor component attachment
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- **FRE-588** (DB schema): Needed for project metadata
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- **FRE-596** (Auth): Needed for JWT token generation
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### ⚠️ Known Blockers
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1. **WebSocket server infrastructure deployment** - Server code ready, needs deployment
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2. **JWT authentication setup** - Requires FRE-596 auth tokens
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---
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**Status:** Phase 1 foundation complete, ready for Code Review
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**Next Phase:** Presence & Visibility (Weeks 3-4)
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