limit-any-type

Enforce no-any policy in TypeScript with unknown or interface replacements.

Updated Jul 17, 2017
One-click install
npx skills add https://github.com/luyi985/lyi-bash --skill limit-any-type
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: limit-any-type
Source: https://github.com/luyi985/lyi-bash/tree/main/ai/skills/limit-any-type
Command: npx skills add https://github.com/luyi985/lyi-bash --skill limit-any-type

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps prevent silent type-safety breakages by discouraging the use of the any type in TypeScript and guiding developers toward safer alternatives.

Core Features & Use Cases

  • Iron Rule: Never use any without a documented reason, and prefer explicit types like unknown or interfaces.
  • Common Dangers: Highlights issues such as loss of type safety, broken contracts, and hidden refactoring bugs when any leaks into code.
  • Practical Guidance: Provides a clear path to replace any with proper types and a strategy for gradual refactoring during migrations.

Quick Start

Refactor a failing function that uses any by replacing its parameter and return type with precise interfaces and types.

Frequently Asked Questions about limit-any-type

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does using the TypeScript any type break type safety during refactoring?

Using the TypeScript any type breaks type safety by bypassing compiler checks, which causes hidden refactoring bugs and broken contracts. It disables type validation, allowing silent runtime failures that precise types or unknown would normally catch.

How do I replace any with unknown or proper interfaces in TypeScript?

To replace any in TypeScript, substitute parameters and return types with precise interfaces or the unknown type. This enforces a no any policy, requiring explicit type checks before usage and restoring reliable compiler validation.

What is the best way to migrate untyped JavaScript to TypeScript without losing type safety?

The best way to migrate untyped JavaScript to TypeScript safely is to enforce a no any policy, replacing loose casts with the unknown type or proper interfaces. This gradual refactoring strategy preserves type safety while transitioning.

Can I use TypeScript type safety rules when working with loosely typed libraries?

Yes, you can maintain type safety with loosely typed libraries by avoiding any. Replace untyped library outputs with the unknown type, then apply proper interfaces and explicit type guards to enforce reliable TypeScript contracts.

When should I not use the any type in TypeScript?

You should never use the any type in TypeScript without a documented reason. Avoid any when handling untyped data or unsafe casts, substituting it with unknown or explicit interfaces to prevent silent type-safety breakages.

How do I fix unsafe type casts that compromise TypeScript type safety?

Fix unsafe type casts by replacing any with the unknown type or defining precise interfaces. This strategy enforces type safety, ensuring the TypeScript compiler catches invalid casts during refactoring instead of allowing silent failures.