svelte: provide a way to await the document becoming ready about automerge-repo HOT 1 OPEN

<script>
    // automerge
    import { Repo } from "@automerge/automerge-repo";
    import { IndexedDBStorageAdapter } from "@automerge/automerge-repo-storage-indexeddb";
    import { document, setContextRepo } from "@automerge/automerge-repo-svelte-store";
    // own stuff
    import ActualComponent from "$lib/components/ActualComponent.svelte";

    setContextRepo(
        new Repo({
            storage: new IndexedDBStorageAdapter(),
            network: [],
        }),
    );
    const docHandle = repo.find( URL_GOT_ELSEWHERE );
</script>

{#await docHandle.whenReady()}
    <div>Loading...</div>
{:then _} <!-- the async value of whenReady doesn't matter -->
    <!-- I guess the documents are cached in the repo so now the docHandle inside the store will be ready right away -->
    {@const doc = document( URL_GOT_ELSEWHERE )}
    <!-- ActualComponent may assume doc (the store) is ready and $doc is not undefined -->
    <ActualComponent {doc} />
{/await}