# Coding Standards

Universal coding standards, best practices, and patterns for TypeScript, JavaScript...

- Repository: https://github.com/WorldFlowAI/everything-claude-code (5734 stars)
- Category: Engineering
- License: see repository
- Last updated: 2026-01-23
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add WorldFlowAI/everything-claude-code --skill coding-standards -g -a claude-code -y`
Codex: `npx skills add WorldFlowAI/everything-claude-code --skill coding-standards -g -a codex -y`
Cursor: `npx skills add WorldFlowAI/everything-claude-code --skill coding-standards -g -a cursor -y`
Gemini CLI: `npx skills add WorldFlowAI/everything-claude-code --skill coding-standards -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add WorldFlowAI/everything-claude-code`

## Description

Universal coding standards, best practices, and patterns for TypeScript, JavaScript, React, and Node.js development.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Coding Standards & Best Practices

Universal coding standards applicable across all projects.

## Code Quality Principles

### 1. Readability First
- Code is read more than written
- Clear variable and function names
- Self-documenting code preferred over comments
- Consistent formatting

### 2. KISS (Keep It Simple, Stupid)
- Simplest solution that works
- Avoid over-engineering
- No premature optimization
- Easy to understand > clever code

### 3. DRY (Don't Repeat Yourself)
- Extract common logic into functions
- Create reusable components
- Share utilities across modules
- Avoid copy-paste programming

### 4. YAGNI (You Aren't Gonna Need It)
- Don't build features before they're needed
- Avoid speculative generality
- Add complexity only when required
- Start simple, refactor when needed

## TypeScript/JavaScript Standards

### Variable Naming

```typescript
// ✅ GOOD: Descriptive names
const marketSearchQuery = 'election'
const isUserAuthenticated = true
const totalRevenue = 1000

// ❌ BAD: Unclear names
const q = 'election'
const flag = true
const x = 1000
```

### Function Naming

```typescript
// ✅ GOOD: Verb-noun pattern
async function fetchMarketData(marketId: string) { }
function calculateSimilarity(a: number[], b: number[]) { }
function isValidEmail(email: string): boolean { }

// ❌ BAD: Unclear or noun-only
async function market(id: string) { }
function similarity(a, b) { }
function email(e) { }
```

### Immutability Pattern (CRITICAL)

```typescript
// ✅ ALWAYS use spread operator
const updatedUser = {
  ...user,
  name: 'New Name'
}

const updatedArray = [...items, newItem]

// ❌ NEVER mutate directly
user.name = 'New Name'  // BAD
items.push(newItem)     // BAD
```

### Error Handling

```typescript
// ✅ GOOD: Comprehensive error handling
async function fetchData(url: string) {
  try {
    const response = await fetch(url)

    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`)
    }

The rest: https://github.com/WorldFlowAI/everything-claude-code/blob/HEAD/skills/coding-standards/SKILL.md