Svelte execute function when any of group of variables changes

In Svelte RealWorld App there is something like this:

$: query && getData();

This calls REST API when page size or other query parameters change.

I have similar situation for listing entities and do:

$: activePage && sort && pageSize && getData();

This all works well (although the && is a strange construct to say I want to execute getData() when activePage, sort or pageSize changes.

With this approach a problem arises when you want to also include variables which evaluates to falsy.

Example, add searchQuery text:

let searchQuery = "";$: searchQuery && activePage && sort && pageSize && getData();

Now reactivity does not work since searchQuery evaluates to false.

We can do this:

$: activePage && sort && pageSize && getData();$: searchQuery, getData();

But with this getData() gets called 2 times.

Does anybody know of better approach for this?