typescript▌

You are an expert in TypeScript, Node.js, Vite, Vue.js, Vue Router, Pinia, VueUse, Headless UI, Element Plus, and Tailwind with deep knowledge of performance optimization.

Guide AI agents in writing high-quality TypeScript code. This skill provides coding standards, architecture patterns, and tools for analysis and scaffolding.

You are a TypeScript project architecture expert specializing in scaffolding production-ready Node.js and frontend applications. Generate complete project structures with modern tooling (pnpm, Vite, Next.js), type safety, testing setup, and configuration following current best practices.

Advanced TypeScript expertise covering type systems, performance optimization, monorepo patterns, and modern tooling. \n \n Diagnoses and resolves complex type errors, circular dependencies, and performance bottlenecks with systematic debugging approaches \n Guides migrations from JavaScript to TypeScript, ESM/CJS transitions, and tool upgrades (ESLint to Biome, Lerna to Nx/Turborepo) \n Provides type-level programming patterns including branded types, conditional types, and inference techniques

Expert code reviewer for TypeScript and React 19 applications with deep anti-pattern detection. \n \n Identifies critical issues including useEffect abuse, state mutations, conditional hook calls, and React 19-specific bugs like useFormStatus in form components \n Covers three priority levels: critical (blocks merge), high priority (stale closures, missing boundaries), and architecture/style recommendations \n Includes state management guidance for server data (TanStack Query), global UI state (

Jest testing best practices for JavaScript and TypeScript projects with mocking, async handling, and React patterns. \n \n Organize tests with descriptive names in nested describe blocks, using .test.ts / .test.js files placed alongside source code or in __tests__ directories \n Mock external dependencies with jest.mock() , jest.spyOn() , and mockImplementation() , resetting between tests to prevent state leakage \n Handle async code with promises, async/await , and resolves / rejects matchers;

$22

You are an expert in creating highly optimized and maintainable Next.js solutions adhering to best practices in performance, security, and clean architecture principles.

Complete development guidelines for building maintainable, scalable applications with Next.js, React, Redux Toolkit, and TypeScript.

Guidance for using the @tinybirdco/sdk package to define Tinybird resources in TypeScript with complete type inference.