Node.js Development

Expert knowledge for modern JavaScript/TypeScript development with focus on high-performance tooling and frameworks.

When to Use This Skill

Core Expertise

Modern JavaScript Tooling

• Bun: Primary JavaScript runtime and package manager (25x faster than npm)
• Vite: Lightning-fast build tool with HMR and optimized production builds
• TypeScript: Type-safe development with modern configurations
• ESM: Modern module syntax and tree-shaking optimization

Key Capabilities

Bun Runtime & Package Management

• Use bun install for dependency installation and bun.lock for reproducible builds
• Implement bun run for script execution and bun dev/bun build patterns
• Configure bunfig.toml for project-specific Bun settings
• Leverage Bun's native TypeScript support and built-in bundler

Vue 3 & Modern Frontend

• Vue 3: Composition API, script setup, and reactive patterns
• Pinia: State management with TypeScript support
• Vuetify: Material Design components
• Vite: Fast development server with instant HMR

TypeScript Excellence

• Configure TypeScript with strict mode and modern target settings
• Implement comprehensive type definitions for Vue components and stores
• Use TypeScript with Vite for optimal development experience
• Apply advanced TypeScript patterns for robust applications

Testing & Quality Assurance

• Vitest: Fast unit testing framework with native TypeScript support
• Playwright: End-to-end testing with browser automation
• Biome: Code quality and formatting (unified, fast)

Debugging

• Chrome DevTools: Advanced debugging for browser and Node.js
• Node.js Inspector: Built-in debugging with breakpoints and profiling
• Heap Snapshots: Memory leak detection and heap analysis
• Performance Profiling: CPU profiling, flame graphs, bottleneck identification
• Vue DevTools: Component tree, state inspection, performance monitoring

Essential Commands

# Bun-first workflow
bun create vite my-app --template vue-ts  # Create Vue 3 + TypeScript project
cd my-app && bun install                  # Install dependencies

# Development
bun dev                          # Start dev server
bun build                        # Build for production
bun run check                    # Run Biome lint + format
bun run test                     # Run tests

# Debugging
node --inspect script.js         # Node.js debugging
bun --inspect script.ts          # Bun debugging
node --prof script.js            # CPU profiling

Best Practices

Project Structure

• Organize Vue 3 projects with clear component, store, and router separation
• Configure vite.config.ts with optimizations
• Implement proper error boundaries and loading states
• Use Vue 3's Teleport and Suspense for advanced UI patterns

Performance & Security

• Implement proper CSP headers and security configurations
• Optimize images and assets with Vite's asset handling
• Use lazy loading and code splitting
• Apply proper form validation and sanitization

Type Safety

// Modern type annotations (TypeScript 5.0+)
function processData(
    items: string[],
    config: Record<string, number>,
    optional?: string | null
): [boolean, string] {
    return [true, "success"];
}

For detailed debugging patterns, Vue 3 component structure, Vite configuration, production debugging, and framework integration, see REFERENCE.md.