Is it suitable for large monorepos?

Yes, it is specifically optimized for monorepos, using efficient discovery commands like ripgrep to sample issues across multiple packages without overloading the context.

Will this skill change my application's runtime behavior?

The skill includes guardrails to ensure changes are focused on type-level improvements. It recommends adding tests for any new type guards to ensure runtime logic remains consistent.

What types of code issues does Preen TypeScript identify?

It proactively searches for 'any' annotations, unsafe type assertions using 'as', un-narrowed 'unknown' types, and suppressed errors like @ts-ignore or @ts-expect-error.

How does it prioritize which types to fix first?

It follows a high-impact strategy, prioritizing function signatures and exported interfaces that affect the widest range of consuming code before moving to local variables.

TypeScript Type Strengthener

Name: TypeScript Type Strengthener
Author: a2f0

bya2f0

0•

開発者ツール

Proactively identifies and refactors weak TypeScript typings to enhance code safety and maintainability within monorepos.

Preen TypeScript is a specialized Claude Code skill designed to systematically improve the type safety of large-scale TypeScript projects. It automates the discovery of technical debt such as 'any' types, unsafe 'as' casts, and suppressed errors, providing a structured workflow to replace them with robust alternatives like custom type guards, generics, and narrowing patterns. By prioritizing high-impact areas like exported interfaces and function signatures, it helps developers eliminate runtime risks and improve developer experience during maintenance cycles or project downtime.

主な機能

01Structured strategies for eliminating @ts-ignore and @ts-expect-error comments

020 GitHub stars

03Standardized patterns for creating reusable and testable type guards

04Impact-based prioritization for targeted refactoring

05Automated discovery of 'any', 'unknown', and unsafe type assertions

06Incremental PR workflow designed for low-risk, high-reward type improvements

ユースケース

01Strengthening type safety after a rapid prototyping or migration phase

02Reducing technical debt in mature TypeScript monorepos

03Standardizing validation for external data from APIs, WebSockets, or storage

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add a2f0/tearleads preen-typescript

For use in Claude.ai and ChatGPT

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