precise-any-variants

Recommend precise TypeScript any variants for arrays, objects, and functions.

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

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps developers manage the unsafe and overly broad use of TypeScript's any type by guiding them toward precise variants that preserve type safety.

Core Features & Use Cases

  • Recommends specific variants for common scenarios: use any[] for arrays, Record<string, any> for objects, and () => any for functions to retain structure while accommodating dynamic data.
  • Encourages safer alternatives like unknown for truly unknown data and provides concrete examples across data parsing, API integration, and dynamic data handling.
  • Helps teams maintain consistent typing discipline during migrations from JavaScript or dynamic sources, reducing runtime errors and improving maintainability.

Quick Start

Choose the most specific any variant for the given use case and annotate your function signatures accordingly.

Frequently Asked Questions about precise-any-variants

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

FAQPage Schema
What is the best way to replace the any type in TypeScript to preserve type safety?

To preserve type safety, replace the broad any type with precise variants: use any[] for arrays, Record<string, any> for objects, and () => any for functions. For truly unknown data, use the safer unknown type to enforce static typing discipline.

How do I handle dynamic API responses in TypeScript without using any?

Handle dynamic API responses by using Record<string, any> for object structures and any[] for arrays. Alternatively, adopt the unknown type for unverified data payloads to enforce type checking before accessing properties, ensuring safer data parsing.

When should I use unknown instead of any in TypeScript?

Use unknown instead of any in TypeScript when dealing with truly unknown data sources. The unknown type forces type narrowing and validation before use, whereas precise any variants like any[] or Record<string, any> retain dynamic structure while accommodating data parsing.

Does TypeScript type safety work for arrays and functions with dynamic data?

TypeScript type safety works for dynamic data by applying precise variants: any[] for arrays and () => any for functions. This maintains structural typing discipline while accommodating dynamic data scenarios without completely losing static typing checks.

Why does using the any type cause issues during JavaScript to TypeScript migrations?

Using the any type during migrations causes issues by bypassing static typing checks, leading to runtime errors. Narrowing any usage to precise variants like Record<string, any> or unknown ensures consistent typing discipline and improves code maintainability.

What are the limitations of using precise any variants for static typing?

The limitation of precise any variants like Record<string, any> is that they still bypass deep type checking for object values. For strict static typing, unknown is recommended to enforce explicit type narrowing and validation before data consumption.