How to set title or meta tags in Svelte Kit

https://github.com/sveltejs/kit/issues/3305#issuecomment-1022833161

root layout.

<script>
  import { page } from "$app/stores"
</script>
 
<svelte:head>
  <title>{$page.stuff.title || 'untitled page'}</title>
</svelte:head>

on a page

<script context="module">
  export function load() {
    return {
      // ...
      stuff: { title: "hello world" },
    }
  }
</script>