Can't seem to write item values to the item database?

import ItemInput from "~/components/item/ItemInput.svelte";

<script>
  function updateItem(item) {
    item.update({ system: item.system });
  }
</script>
<TextInput bind:value="{item.system.quantity}" on:change="{updateItem(item)}" />

<script>
function updateItem(item, index) {
    $doc.system.items[index].quantity = item.system.quantity;
    $doc.update({
      system: $doc.system,
      flags: $doc.flags,
      name: $doc.name,
    });
  }
</script>
<TextInput bind:value="{item.system.quantity}" on:change="{updateItem(item, index)}" />

  function updateItem(item, index) {
    const actor = $doc;
    let Item = actor.items.find((i) => i.name === item.name);
    Item.system.quantity = item.system.quantity;

    console.log(Item.system.quantity);

    Item.update({ quantity: Item.system.quantity });
  }

  import { TJSinputText } from "@typhonjs-fvtt/svelte-standard/component/standard/form/input";

 Missing "./component/standard/form/input" export in "@typhonjs-fvtt/svelte-standard" package