memory-leak

name	memory-leak
description	Finds potential memory leaks - uncleaned listeners, unclosed connections, growing caches
argument-hint	["file-path"]
user-invocable	true
allowed-tools	Read Grep Glob
effort	medium

Memory Leak Analysis

Target: $1 (or src/ if not specified)

Pattern 1: Event Listeners Without Cleanup

// ❌ Listener added but never removed
useEffect(() => {
  window.addEventListener('resize', handler)
}, []) // Missing: return () => window.removeEventListener('resize', handler)

Pattern 2: Timers Not Cleared

// ❌ Interval runs forever
setInterval(syncData, 5000)

// ✅ Store ref and clear on unmount
const id = setInterval(syncData, 5000)
return () => clearInterval(id)

Pattern 3: Unbounded Caches

// ❌ Cache grows indefinitely
const cache = new Map()
cache.set(key, value) // never evicted

Pattern 4: Unclosed DB/File Connections

Look for db.connect() without corresponding db.close() in error paths.

---

For each finding:

1. Show the leaking code
2. Explain what accumulates and why it matters
3. Provide the fix

Rate by severity: Critical (crashes in production under load) / Warning (gradual degradation) / Minor (theoretical).