memory-leak-detection
Detect and fix memory leaks using heap snapshots, memory profiling, and leak detection tools. Use when investigating memory growth, OOM errors, or optimizing memory usage.
What this skill does
# Memory Leak Detection
## Table of Contents
- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)
## Overview
Identify and fix memory leaks to prevent out-of-memory crashes and optimize application performance.
## When to Use
- Memory usage growing over time
- Out of memory (OOM) errors
- Performance degradation
- Container restarts
- High memory consumption
## Quick Start
Minimal working example:
```typescript
import v8 from "v8";
import fs from "fs";
class MemoryProfiler {
takeSnapshot(filename: string): void {
const snapshot = v8.writeHeapSnapshot(filename);
console.log(`Heap snapshot saved to ${snapshot}`);
}
getMemoryUsage(): NodeJS.MemoryUsage {
return process.memoryUsage();
}
formatMemory(bytes: number): string {
return `${(bytes / 1024 / 1024).toFixed(2)} MB`;
}
printMemoryUsage(): void {
const usage = this.getMemoryUsage();
console.log("Memory Usage:");
console.log(` RSS: ${this.formatMemory(usage.rss)}`);
console.log(` Heap Total: ${this.formatMemory(usage.heapTotal)}`);
console.log(` Heap Used: ${this.formatMemory(usage.heapUsed)}`);
console.log(` External: ${this.formatMemory(usage.external)}`);
// ... (see reference guides for full implementation)
```
## Reference Guides
Detailed implementations in the `references/` directory:
| Guide | Contents |
|---|---|
| [Node.js Heap Snapshots](references/nodejs-heap-snapshots.md) | Node.js Heap Snapshots |
| [Memory Leak Detection Middleware](references/memory-leak-detection-middleware.md) | Memory Leak Detection Middleware |
| [Common Memory Leak Patterns](references/common-memory-leak-patterns.md) | Common Memory Leak Patterns |
| [Python Memory Profiling](references/python-memory-profiling.md) | Python Memory Profiling |
| [WeakMap/WeakRef for Cache](references/weakmapweakref-for-cache.md) | WeakMap/WeakRef for Cache |
| [Memory Monitoring in Production](references/memory-monitoring-in-production.md) | Memory Monitoring in Production |
## Best Practices
### ✅ DO
- Remove event listeners when done
- Clear timers and intervals
- Use WeakMap/WeakRef for caches
- Limit cache sizes
- Monitor memory in production
- Profile regularly
- Clean up after tests
### ❌ DON'T
- Create circular references
- Hold references to large objects unnecessarily
- Forget to clean up resources
- Ignore memory growth
- Skip WeakMap for object caches
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