FinalizationRegistry() constructor

The FinalizationRegistry constructor creates a FinalizationRegistry object that uses the given callback.

Syntax

// Arrow callback function
new FinalizationRegistry((heldValue) => { /* … */ })

// Callback function
new FinalizationRegistry(callbackFn)

// Inline callback function
new FinalizationRegistry(function(heldValue) { /* … */ })

Note: FinalizationRegistry() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

callback: The callback function this registry should use.

Examples

Creating a new registry

You create the registry passing in the callback:

const registry = new FinalizationRegistry((heldValue) => {
  // …
});

Specifications

Specification
ECMAScript Language Specification # sec-finalization-registry-constructor

Browser compatibility

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