Does this skill help with avoiding the 'any' type?

Yes, it provides specific patterns for using 'unknown' combined with type guards or generics to ensure every piece of data is properly typed without using escape hatches.

When does the skill prefer interfaces over types?

The guidelines recommend using interfaces for object definitions and using types for unions, intersections, and mapped types for better performance and extensibility.

How does this skill ensure code correctness?

It enforces strict compiler options and requires a successful type-check run (like bun run typecheck or tsc --noEmit) before any task is considered complete.

How does it handle asynchronous or external data?

It promotes the use of generics in fetch functions and type predicates to safely narrow external data into known types before usage.

Is functional programming supported?

Absolutely. The skill encourages functional patterns like .map() and .filter() with type predicates instead of imperative for-loops to ensure cleaner, more declarative code.

TypeScript Best Practices

Name: TypeScript Best Practices
Author: kingstinct

bykingstinct

0•

Developer Tools

Enforces type-safe, ergonomic TypeScript development through strict configuration, type narrowing, and functional programming patterns.

This skill provides a comprehensive framework for writing high-quality TypeScript code within Claude Code. It focuses on maximizing type safety and developer experience by enforcing strict TSConfig options, discouraging the use of the 'any' type, and promoting advanced type-narrowing techniques. By integrating functional programming principles and mandatory type-checking workflows, this skill ensures that Claude generates production-grade code that is both maintainable and robust, significantly reducing runtime errors and improving codebase documentation through types.

Key Features

01Ergonomic type reuse strategies utilizing Pick, Omit, and Partial utility types

020 GitHub stars

03Strict TSConfig enforcement including strictNullChecks and noUncheckedIndexedAccess

04Advanced type narrowing using discriminated unions, type predicates, and the 'in' operator

05Functional programming standards for data transformation over imperative loops

06Mandatory type-check verification (tsc --noEmit) before task completion

Use Cases

01Standardizing modern TypeScript patterns and functional coding styles across distributed development teams

02Designing complex state management systems using discriminated unions for robust error handling

03Refactoring loosely typed or legacy JavaScript codebases into strict, type-safe TypeScript environments

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add kingstinct/.github typescript

For use in Claude.ai and ChatGPT

Download Skill