Svelte components with generics

I want to use a generic type in a Svelte(Kit) component's props, and I found out there is this type T = $$Generic thing:

<script lang="ts">  import type { Writable } from "svelte/store";  type T = $$Generic;  export let store: Writable<T[]>;</script>

While that is great, I do need slightly more information than that: I require that the T has a property id. Normally I'd do something like this:

export type WithId = { id: number };function foo<T extends WithId>(property: T) { ... }

How can I do something similar for Svelte component props?