Replace alien dollar sign with your favorite alien string.
npm i -D svelte-preprocess-alien
// svelte.config.js
import { alien } from 'svelte-preprocess-alien';
...
preprocess: [alien('🐸🐸🐸'), vitePreprocess({})],
...
Now you can write Svelte reactivity like this
<script lang="ts">
🐸🐸🐸: mine = $page.url.searchParams.get('mine');
</script>