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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/dispose below:

Symbol.dispose - JavaScript | MDN

The Symbol.dispose static data property represents the well-known symbol Symbol.dispose. The using declaration looks up this symbol on the variable initializer for the method to call when the variable goes out of scope.

The well-known symbol Symbol.dispose.

An object is disposable if it has the [Symbol.dispose]() method. The method is expected to have the following semantics:

• Invoking this method notifies the Disposable object that the caller does not intend to continue to use this object. This method should perform any necessary logic to explicit clean up the resource including, but not limited to, file system handles, streams, host objects, etc.
• When an exception is thrown from this method, it typically means that the resource could not be explicitly freed.
• If called more than once on the same object, the function should not throw an exception. However, this requirement is not enforced.

This method should not return a promise, as promises returned by [Symbol.dispose]() are not awaited by await using. To declare async disposables, use Symbol.asyncDispose.

[Symbol.dispose] allows the creation of custom disposables. See the using reference for more information.

class Disposable {
  constructor() {
    this.disposed = false;
  }

  [Symbol.dispose]() {
    this.disposed = true;
  }

  get isDisposed() {
    return this.disposed;
  }
}

const resource = new Disposable();
{
  using resourceUsed = resource;
  console.log(resource.isDisposed); // false
}
console.log(resource.isDisposed); // true

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