A better way to check if slot is present?

[frederikhors]

Is there a better way to check if slot is present?

Currently I found online this for a Modal:

<script>
    const has_footer = (arguments[1].$$slots || {}).hasOwnProperty('footer')
</script>

{#if has_footer}
    <div class="modal-footer">
        <slot name="footer" />
    </div>
{/if}

What do you think about?

[Conduitry]

See #2106.

[frederikhors]

For people coming here, there it is a solution today working: #2106 (comment)