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This skill equips Claude with advanced knowledge of the modern JavaScript and TypeScript ecosystem, focusing on high-quality code patterns and strict type safety. It provides standardized TypeScript configurations, advanced utility types for cleaner codebases, and efficient patterns for React hooks and Node.js backend services. Whether you are building complex frontend interfaces or scalable backend APIs, this skill ensures best practices in asynchronous programming, error handling, and type-driven development for production-grade software.