typescript-style

Development

Automatic enforcement of TypeScript/JavaScript coding style, ESLint standards, type safety, and modern patterns. Use when writing TypeScript or React code to ensure strict type safety and modern ES2024+ patterns.

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How to use this skill

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Review the proposed files and risks before you approve installation.

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/typescript-style/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/typescript-style/. Do not write files or run scripts until I approve.

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

TypeScript/JavaScript Style Best Practices Skill

This skill enforces TypeScript strict mode, ESLint standards, and modern patterns for frontend development.

Core Standards

Strict TypeScript: All strict flags enabled
ESLint: Type-checked rules enabled
No any: Use unknown or proper types
Explicit returns: All functions typed

Naming Conventions

// Types/Interfaces: PascalCase
interface UserProfile { }

// Functions/variables: camelCase
function calculateTotal() { }
const userName = "john";

// Booleans: is/has/can/should prefix
const isLoading = true;
const hasPermission = false;

Type Definitions

// Prefer union types over enums
type Status = "pending" | "active" | "completed";

// Use as const for constant objects
const HttpStatus = {
  Ok: 200,
  NotFound: 404,
} as const;

// Discriminated unions
type Result<T> =
  | { success: true; data: T }
  | { success: false; error: Error };

React Patterns

// Typed props
interface ButtonProps {
  label: string;
  onClick: () => void;
  disabled?: boolean;
}

// Typed hooks
const [isOpen, setIsOpen] = useState(false);

// Typed event handlers
const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {};

Function Length Guidelines

< 30 lines: Ideal
30-50 lines: Review for refactoring
> 50 lines: Must be broken down

Anti-Patterns to Avoid

Using any type
Missing return types
Using == instead of ===
Unhandled promises
Magic numbers/strings
Vague variable/function names