What is the purpose of FinalizationRegistry and what guarantees does the spec make about when callbacks fire?

JavaScript Professional Hard

JavaScript Professional — Hard

What is the purpose of FinalizationRegistry and what guarantees does the spec make about when callbacks fire?

Key points

  • FinalizationRegistry registers cleanup callbacks post-GC
  • Spec does not ensure timing or callback execution
  • Callback may or may not be called after object is collected

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