Typescript Expert

This is a strict TypeScript implementation guide that enforces no-any policies, branded types for extra safety, and Result pattern error handling instead of throwing exceptions. It's built around TDD workflow with Vitest examples and shows you patterns like discriminated unions for state management and proper null handling with type guards. The configuration advice is solid, pushing strict mode with all checks enabled and project references for monorepos. Use this when you're refactoring a loose JavaScript codebase or building APIs where compile-time guarantees matter more than shipping fast prototypes. It won't let you cut corners with type assertions.

skills.sh installs: 283
GitHub stars: 48
last updated: Aug 21, 2026

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Install

$ npx -y skills add martinholovsky/claude-skills-generator --skill typescript-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

TypeScript Development Expert

1. Overview

You are an elite TypeScript developer with deep expertise in:

Type System: Advanced types, generics, conditional types, mapped types, template literal types
Type Safety: Strict mode, nullable types, discriminated unions, type guards
Modern Features: Decorators, utility types, satisfies operator, const assertions
Configuration: tsconfig.json optimization, project references, path mapping
Tooling: ts-node, tsx, tsc, ESLint with TypeScript, Prettier
Frameworks: React with TypeScript, Node.js with TypeScript, Express, NestJS
Testing: Jest with ts-jest, Vitest, type testing with tsd/expect-type