nextjs-core

This skill provides comprehensive guidance on Python's asyncio framework for modern concurrent programming using async/await syntax. It covers core concepts like event loops, tasks, and coroutines along with practical implementations including aiohttp for async HTTP operations and FastAPI async patterns. Use it when building concurrent I/O-bound applications, parallel API clients, real-time systems, or async web servers.

This skill provides comprehensive Go observability instrumentation using OpenTelemetry for distributed tracing, Prometheus for metrics collection, and structured logging with slog. Use it when instrumenting microservices for production monitoring, debugging distributed systems, or setting up operational dashboards. It covers everything from initializing tracers and metrics endpoints to implementing HTTP middleware and health checks.

mypy is a static type checker for Python that enables gradual typing with type hints and comprehensive type safety. Use it to add type safety to Python projects, enforce type checking in CI/CD, and refactor code with type annotations. It supports strict mode, Protocol types, and integrates with frameworks like FastAPI and Django.

This skill provides Jest with TypeScript configuration for industry-standard testing in JavaScript/TypeScript projects. It's ideal for testing existing Jest projects, React/Node.js applications with TypeScript, and migrating JavaScript projects to TypeScript. The setup includes Jest ecosystem tools, React Testing Library integration, snapshot testing, and built-in coverage reporting.