How to use the @esfx/cancelable.CancelSubscription.create function in @esfx/cancelable

function createCancelSubscription(node: LinkedListNode<() => void>): CancelSubscription {
    return CancelSubscription.create(() => {
        if (node.detachSelf()) {
            node.value = undefined!;
        }
    });
}

subscribe(onCancellationRequested): CancelSubscription {
                let callback = () => onCancellationRequested();
                abortSignal.addEventListener("abort", callback);
                return CancelSubscription.create(() => {
                    if (callback && abortSignal) {
                        abortSignal.removeEventListener("abort", callback);
                        callback = undefined!;
                    }
                });
            }
        };