How to onCleanup an async resource from createResource?

createResource(url, async (url) => {
    var resource;
    tryOnCleanup(() => resource?.close());
    return resource = await connectToUrl(url);
});

createResource(url, async (url, info) => {
    tryOnCleanup(() => info.value?.close()); // not sure if this reference gets updated?
    return await connectToUrl(url);
});

const [conn] = createResource(url, async (url) => await connectToUrl(url));
createComputed(() => { const c = conn(); tryOnCleanup(() => c?.close()) })