Svelte - access child component's method

I have an app that simply hides content Hidden.svelte:

<script>    let shown = false;    function show() {        shown = true;    }</script><svelte:options accessors={true}/>{#if shown}<slot/>{/if}

Parent App.svelte:

<script>    import Hidden from 'Hidden';    let child;</script><Hidden bind:this={child}>    Content</Hidden><button on:click={() => child.shown = true}>Show</button>

So, child's shown can be easily set due to <svelte:options accessors={true}/> in parent

But, I want to use method show() since it can not only set shown value, but also perform some magic

Thx to Chrome's DevTools, I found that all components have an Array with props and methods, that could be accessed via some .$$.ctx, so Hidden's show() method can be called like this:

<button on:click={() => child.$$.ctx[2]()}>Show</button>

But) You know) Is there is a legal way to do it?