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56454af931
* perf(frontend): cache settled copy-data derivation across streaming chunks Every SSE values chunk re-renders MessageList, and the re-render re-derived copy/toolbar text for every settled row: getAssistantTurnCopyData re-ran the O(turn bytes) content extraction per settled group, and MessageListItem's toolbar recomputed getMessageCopyData per message. Settled group arrays keep their identity across chunks (deriveStableMessageGroups), so both derivations now cache on that stable reference: a WeakMap keyed on the messages array for turn copy data, and a useMemo on message identity for the toolbar copy text. Fixes #5094 * fix(frontend): gate row copy-data memo and correct cache win claim Address review: derive one memoized copy value only when isHuman || (!isLoading && showCopyButton) and reuse it for both editing and the toolbar, so settled assistant rows (whose toolbar never renders) skip the derivation and human rows derive once, not twice; correct the assistantTurnCopyDataCache comment — the regex/trim split is already cached per message, the cache's win is the traversal/allocations for string turns and the uncached O(bytes) map/join/trim for array-content turns (benchmarked: 5.1x / 17.2x per settled history sweep). * style(frontend): expand single-line messages array for Prettier
DeerFlow Frontend
Like the original DeerFlow 1.0, we would love to give the community a minimalistic and easy-to-use web interface with a more modern and flexible architecture.
Tech Stack
- Framework: Next.js 16 with App Router
- UI: React 19, Tailwind CSS 4, Shadcn UI, MagicUI and React Bits
- AI Integration: LangGraph SDK and Vercel AI Elements
Quick Start
Prerequisites
- Node.js 22+
- pnpm 10.26.2+
Installation
# Install dependencies
pnpm install
# Copy environment variables
cp .env.example .env
# Edit .env with your configuration
Development
# Start development server
pnpm dev
# The app will be available at http://localhost:3000
Build & Test
# Type check
pnpm typecheck
# Check formatting
pnpm format
# Apply formatting
pnpm format:write
# Lint
pnpm lint
# Run unit tests
pnpm test
# One-time setup: install Playwright Chromium browser
pnpm exec playwright install chromium
# Run E2E tests (builds and starts production server automatically)
pnpm test:e2e
# Build for production
pnpm build
# Start production server
pnpm start
Site Map
├── / # Landing page
├── /chats # Chat list
├── /chats/new # New chat page
└── /chats/[thread_id] # A specific chat page
Configuration
Environment Variables
Key environment variables (see .env.example for full list):
# Backend API URL (optional, uses local Next.js/nginx proxy by default)
NEXT_PUBLIC_BACKEND_BASE_URL="http://localhost:8001"
# LangGraph-compatible API URL (optional, uses local Next.js/nginx proxy by default)
NEXT_PUBLIC_LANGGRAPH_BASE_URL="http://localhost:8001/api"
Project Structure
tests/
├── e2e/ # E2E tests (Playwright, Chromium, mocked backend)
└── unit/ # Unit tests (mirrors src/ layout)
src/
├── app/ # Next.js App Router pages
│ ├── api/ # API routes
│ ├── showcase/ # Allowlisted public read-only demos
│ ├── workspace/ # Main workspace pages
│ └── mock/ # Mock/demo pages
├── components/ # React components
│ ├── ui/ # Reusable UI components
│ ├── workspace/ # Workspace-specific components
│ ├── landing/ # Landing page components
│ └── ai-elements/ # AI-related UI elements
├── core/ # Core business logic
│ ├── api/ # API client & data fetching
│ ├── artifacts/ # Artifact management
│ ├── config/ # App configuration
│ ├── i18n/ # Internationalization
│ ├── mcp/ # MCP integration
│ ├── messages/ # Message handling
│ ├── models/ # Data models & types
│ ├── settings/ # User settings
│ ├── skills/ # Skills system
│ ├── threads/ # Thread management
│ ├── todos/ # Todo system
│ └── utils/ # Utility functions
├── hooks/ # Custom React hooks
├── lib/ # Shared libraries & utilities
├── server/ # Server-side code
│ └── better-auth/ # Authentication setup and session helpers
└── styles/ # Global styles
Scripts
| Command | Description |
|---|---|
pnpm dev |
Start development server (Webpack on Windows, Turbopack elsewhere) |
pnpm build |
Build for production |
pnpm start |
Start production server |
pnpm test |
Run unit tests with Rstest |
pnpm test:e2e |
Run E2E tests with Playwright |
pnpm format |
Check formatting with Prettier |
pnpm format:write |
Apply formatting with Prettier |
pnpm lint |
Run ESLint |
pnpm lint:fix |
Fix ESLint issues |
pnpm typecheck |
Run TypeScript type checking |
pnpm check |
Run both lint and typecheck |
Development Notes
- Uses pnpm workspaces (see
packageManagerin package.json) - Turbopack is used by default in development except on Windows, where Webpack avoids known Turbopack runtime instability. Set
DEER_FLOW_DEV_BUNDLER=turboorDEER_FLOW_DEV_BUNDLER=webpackto override the platform default for local diagnosis. - Environment validation can be skipped with
SKIP_ENV_VALIDATION=1(useful for Docker) - Backend API URLs are optional; nginx proxy is used by default in development
License
MIT License. See LICENSE for details.