WeakMap & WeakSet

What design pattern does this code demonstrate with WeakSet?

const disposables = new WeakSet();

class Disposable {
  constructor() {
    disposables.add(this);
  }
  
  static isDisposable(obj) {
    return disposables.has(obj);
  }
  
  dispose() {
    // Cleanup resources
    disposables.delete(this);
  }
}

Observer pattern
Type checking and resource management
This code demonstrates: 1) Using WeakSet for type checking and resource tracking, 2) Automatic cleanup of tracking when objects are garbage collected, 3) A way to mark objects as implementing a specific interface, 4) Resource management without preventing garbage collection, 5) A pattern for tracking disposable objects without memory leaks, 6) Clean integration of type checking with object lifecycle, 7) A memory-efficient way to implement interface marking, 8) Practical application of WeakSet in object-oriented design.
Event handling
Data validation

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