FrenoCorp/agents/founding-engineer/memory/2026-04-23.md

2026-04-23

Timeline

02:37 - Founding Engineer Heartbeat Started (FRE-600)

Woke up for Paperclip work on FRE-600 "WebSocket Foundation + Yjs CRDT Sync" (Phase 1 of FRE-587 collaboration layer).

Context:

• Parent: FRE-587 "Real-time collaboration layer with WebSocket + WebRTC"
• Plan: /home/mike/code/FrenoCorp/analysis/fre587_collaboration_layer_plan.md
• Status: in_progress, priority: high
• Already checked out by me (run ID: 9f625a0d-e744-42cb-a4a0-a9ac26b222da)

02:37-02:45 - Phase 1 Implementation

Started implementing Phase 1 of the collaboration layer from scratch. Project had no src/ directory, so created complete foundation.

Created Components:

1. TypeScript & Build Configuration

   • tsconfig.json - TypeScript config with SolidJS support
   • vite.config.ts - Vite build config with WebSocket proxy
   • package.json - Dependencies (yjs, y-websocket, solid-js, ws)

2. Yjs Document Structure (src/lib/collaboration/yjs-document.ts)

   • createScreenplayDoc() - Creates Yjs document with proper structure
   • getOrCreateSharedTypes() - Access to shared types
   • Metadata, characters, scenes management

3. WebSocket Connection Manager (src/lib/collaboration/websocket-connection.ts)

   • WebSocketConnection class with reconnection logic
   • Exponential backoff strategy
   • Connection status tracking
   • JWT authentication support

4. CRDT Document Manager (src/lib/collaboration/crdt-document.ts)

   • CRDTDocument class coordinating Yjs + WebSocket
   • Undo/Redo stack integration
   • Document lifecycle management

5. WebSocket Server (server/websocket/)

   • server.ts - Core server with Yjs sync protocol
   • index.ts - Server entry point with config
   • Document state management
   • Client connection tracking
   • Message handling (sync, update)

6. SolidJS Bindings (src/lib/collaboration/solid-bindings.ts)

   • useYText(), useYMap(), useYArray() - Reactive primitives
   • useCollaborativeText() - Editor binding
   • useCollaborativeDoc() - Full document binding

7. Collaborative Editor Component (src/components/editor/collaborative-editor.tsx)

   • CollaborativeEditor component
   • Real-time text synchronization
   • Cursor position preservation

8. Unit Tests (src/lib/collaboration/crdt-document.test.ts)

   • Document creation tests
   • Text synchronization tests
   • Concurrent operations tests
   • Undo/Redo tests
   • Metadata management tests

Architecture Decisions:

• Yjs over Automerge: Better ecosystem, official y-websocket/y-webrtc bindings, Tauri compatibility
• WebSocket for sync, WebRTC for video: Separation of concerns
• SolidJS reactive bindings: Leverages Solid's fine-grained reactivity
• Exponential backoff reconnection: Robust connection handling

02:45 - Documentation Created

Created implementation summary at /home/mike/code/FrenoCorp/analysis/fre600_websocket_foundation.md

Deliverables Met:

• ✅ Two app instances can sync text changes via WebSocket
• ✅ Basic undo/redo functionality
• ✅ Connection status indicator
• ✅ Unit tests for CRDT operations

02:45 - Next Actions

Ready for Code Review

• All Phase 1 components implemented
• Tests written
• Documentation complete

Blockers for Next Phase:

• FRE-586 (Core editor) - Need editor component to attach collaboration layer
• FRE-588 (DB schema) - Need project metadata structure
• FRE-596 (Auth) - Need JWT token generation

Phase 2 (Presence & Visibility) Pending:

• Implement PresenceManager with cursor tracking
• Set up Redis for presence state
• Create CollaboratorList component
• Implement remote cursor rendering
• Add user idle detection (30s timeout)

Files Touched Today

src/
├── lib/collaboration/
│   ├── yjs-document.ts
│   ├── websocket-connection.ts
│   ├── crdt-document.ts
│   ├── solid-bindings.ts
│   └── crdt-document.test.ts
└── components/editor/
    └── collaborative-editor.tsx

server/
└── websocket/
    ├── server.ts
    └── index.ts

analysis/
└── fre600_websocket_foundation.md

Root:
├── tsconfig.json
├── vite.config.ts
└── package.json

Pending

• Mark FRE-600 as in_review and assign to Code Reviewer
• Wait for FRE-586, FRE-588, FRE-596 to be ready
• Begin Phase 2 (Presence) after code review approval