javascript-pro
Modern ES2023+ JavaScript implementation with async/await, ESM modules, and Node.js best practices.
- Covers vanilla JavaScript, Promise-based async flows, Web Workers, Fetch API, and browser performance optimization
- Enforces ES2023+ syntax, optional chaining, nullish coalescing, and functional programming patterns
- Includes comprehensive error handling, memory leak detection, and Jest test coverage validation (85%+ target)
- Provides reference guides for async patterns, module systems (ESM/CJS), browser APIs, and Node.js essentials
JavaScript Pro
When to Use This Skill
- Building vanilla JavaScript applications
- Implementing async/await patterns and Promise handling
- Working with modern module systems (ESM/CJS)
- Optimizing browser performance and memory usage
- Developing Node.js backend services
- Implementing Web Workers, Service Workers, or browser APIs
Core Workflow
- Analyze requirements — Review
package.json, module system, Node version, browser targets; confirm.js/.mjs/.cjsconventions - Design architecture — Plan modules, async flows, and error handling strategies
- Implement — Write ES2023+ code with proper patterns and optimisations
- Validate — Run linter (
eslint --fix); if linter fails, fix all reported issues and re-run before proceeding. Check for memory leaks with DevTools or--inspect, verify bundle size; if leaks are found, resolve them before continuing - Test — Write comprehensive tests with Jest achieving 85%+ coverage; if coverage falls short, add missing cases and re-run. Confirm no unhandled Promise rejections
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