What testing framework does this skill recommend?

It mandates the use of Vitest with a target of at least 80% coverage and tests co-located next to source files for better modularity.

Does this skill require TypeScript 5.x?

Yes, it is optimized for TypeScript 5.x to take advantage of modern features like the 'satisfies' operator and const assertions.

Can I use this with React projects?

Yes, it includes specific guidelines for React, such as prioritizing function components and custom hooks with strict prop typing.

How does it handle linting and formatting?

The skill standardizes on Biome for both linting and formatting to ensure high performance and a unified, modern toolchain.

Why does it ban the 'any' type?

Banning 'any' prevents type-safety loopholes, forcing developers to use 'unknown' with type guards or generics for safer, more predictable code.

TypeScript Strictest Standards

Name: TypeScript Strictest Standards
Author: kreuzberg-dev

bykreuzberg-dev

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480

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Developer Tools

Enforces maximum type safety and modern architectural patterns for high-performance TypeScript applications.

This skill provides a comprehensive set of rules and architectural patterns to ensure your TypeScript 5.x codebases achieve the highest possible level of type safety and maintainability. It mandates the use of strict compiler flags, bans permissive types like 'any' or 'object', and promotes functional programming principles alongside modern tooling like Biome and Vitest. By integrating these standards, Claude helps you catch errors at compile-time, ensure consistent testing structures with co-located files, and maintain clean, predictable code across complex enterprise or open-source projects.

Key Features

01Co-located Testing Pattern: Enforces placing .spec.ts files directly alongside source code for better discoverability.

02480 GitHub stars

03Strict Type Enforcement: Automatically mandates all strict flags and bans 'any' or 'object' types.

04Modern Tooling Integration: Standardizes configurations for Biome linting, pnpm, and Vitest.

05Advanced TS Features: Promotes the use of the 'satisfies' operator, const assertions, and type predicates.

06Functional Programming Focus: Prioritizes pure functions, immutability, and readonly structures over class-based designs.

Use Cases

01Standardizing a high-quality development workflow for distributed teams using Claude Code.

02Refactoring legacy TypeScript codebases to meet modern, strict industry standards and eliminate technical debt.

03Building enterprise-grade libraries where type safety and performance are critical requirements.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kreuzberg-dev/html-to-markdown typescript-strictest-standards

For use in Claude.ai and ChatGPT

Download Skill