Code Documentation Skill

"Write code that speaks for itself. Document only WHY, not WHAT."

When to Document

✅ DO document:

• Exported functions, composables, utils
• Vue component props/emits contracts
• Complex business logic or algorithms
• Non-obvious workarounds or hacks

❌ DON'T document:

• Self-explanatory code
• What the code does (use better names instead)
• Obvious operations

Quick Reference

TSDoc for Functions

/**
 * Brief description of what the function does
 * 
 * @param paramName - What this parameter is for
 * @returns What the function returns
 * @throws {ErrorType} When this error occurs (if applicable)
 */
export function myFunction(paramName: string): ReturnType {
  // Implementation
}

Vue Component Documentation

<script setup lang="ts">
interface Props {
  /** Brief description of what this prop does */
  task: Task
  editable?: boolean
}

const emit = defineEmits<{
  'update': [task: Task]
  'delete': []
}>()
</script>

Inline Comments

Only for WHY, not WHAT:

// ✅ Good: Explains reasoning
// Using debounce to prevent API spam during typing
await debounce(handleSearch, 300)

// ❌ Bad: States the obvious  
const total = price + tax // Add price and tax

Annotation Keywords

// TODO: Add authentication
// FIXME: Memory leak in loop
// HACK: Workaround for bug in v2.1.0
// NOTE: Assumes UTC timezone

Summary

1. Self-documenting code first - Good names > comments
2. Explain WHY, not WHAT - Add insight, don't repeat code
3. TSDoc for exports - All public APIs need docs
4. Keep it updated - Wrong docs are worse than no docs