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WeakRef.prototype.deref() - JavaScript | MDN

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The deref() method of WeakRef instances returns this WeakRef's target value, or undefined if the target value has been garbage-collected.

None.

The target value of the WeakRef, which is either an object or a non-registered symbol. Returns undefined if the value has been garbage-collected.

See the Notes on WeakRefs section of the WeakRef page for some important notes.

See the Examples section of the WeakRef page for the complete example.

const tick = () => {
  // Get the element from the weak reference, if it still exists
  const element = this.ref.deref();
  if (element) {
    element.textContent = ++this.count;
  } else {
    // The element doesn't exist anymore
    console.log("The element is gone.");
    this.stop();
    this.ref = null;
  }
};

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