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everything-claude-code/rules/coding-style.md
Affaan Mustafa 45959c326e Initial release: Complete Claude Code configuration collection
Battle-tested configs from 10+ months of daily Claude Code usage.
Won Anthropic x Forum Ventures hackathon building zenith.chat.

Includes:
- 9 specialized agents (planner, architect, tdd-guide, code-reviewer, etc.)
- 9 slash commands (tdd, plan, e2e, code-review, etc.)
- 8 rule files (security, coding-style, testing, git-workflow, etc.)
- 7 skills (coding-standards, backend-patterns, frontend-patterns, etc.)
- Hooks configuration (PreToolUse, PostToolUse, Stop)
- MCP server configurations (15 servers)
- Plugin/marketplace documentation
- Example configs (project CLAUDE.md, user CLAUDE.md, statusline)

Read the full guide: https://x.com/affaanmustafa/status/2012378465664745795
2026-01-17 17:49:33 -08:00

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# Coding Style
## Immutability (CRITICAL)
ALWAYS create new objects, NEVER mutate:
```javascript
// WRONG: Mutation
function updateUser(user, name) {
user.name = name // MUTATION!
return user
}
// CORRECT: Immutability
function updateUser(user, name) {
return {
...user,
name
}
}
```
## File Organization
MANY SMALL FILES > FEW LARGE FILES:
- High cohesion, low coupling
- 200-400 lines typical, 800 max
- Extract utilities from large components
- Organize by feature/domain, not by type
## Error Handling
ALWAYS handle errors comprehensively:
```typescript
try {
const result = await riskyOperation()
return result
} catch (error) {
console.error('Operation failed:', error)
throw new Error('Detailed user-friendly message')
}
```
## Input Validation
ALWAYS validate user input:
```typescript
import { z } from 'zod'
const schema = z.object({
email: z.string().email(),
age: z.number().int().min(0).max(150)
})
const validated = schema.parse(input)
```
## Code Quality Checklist
Before marking work complete:
- [ ] Code is readable and well-named
- [ ] Functions are small (<50 lines)
- [ ] Files are focused (<800 lines)
- [ ] No deep nesting (>4 levels)
- [ ] Proper error handling
- [ ] No console.log statements
- [ ] No hardcoded values
- [ ] No mutation (immutable patterns used)