Discussion about a reference warning in Sanity Studio and how to resolve it.

import S from "@sanity/desk-tool/structure-builder";
import DocumentsPane from "sanity-plugin-documents-pane";

S.view
  .component(DocumentsPane)
  .options({
    query: `*[!(_id in path("drafts.**")) && references($id)]`,
    params: { id: `_id` },
    useDraft: false,
    debug: true,
  })
  .title("Incoming References");

{
      "name": "part:@sanity/desk-tool/structure",
      "path": "./src/deskStructure.js"
    }

import S from "@sanity/desk-tool/structure-builder";
import DocumentsPane from "sanity-plugin-documents-pane";

export const getDefaultDocumentNode = () => {
  return S.document().views([
    S.view.form(), 
    S.view
     .component(DocumentsPane)
     .options({
        query: `*[!(_id in path("drafts.**")) && references($id)]`,
        params: { id: `_id` },
        useDraft: false,
        debug: true,
      })
      .title("Incoming References");
  ]);
};

Structure needs to export a function, an observable, a promise or a structure builder, got undefined

import S from "@sanity/desk-tool/structure-builder";
import DocumentsPane from "sanity-plugin-documents-pane";

export const getDefaultDocumentNode = () => {
  return S.document().views([
    S.view.form(), 
    S.view
     .component(DocumentsPane)
     .options({
        query: `*[!(_id in path("drafts.**")) && references($id)]`,
        params: { id: `_id` },
        useDraft: false,
        debug: true,
      })
      .title("Incoming References");
  ]);
};

export default () =>
  S.list()
    .title('Content')
    .items(
      S.documentTypeListItems()
    )