chore: Upgrade flow (#1854)

* wip: upgrade flow

* chore: More sealed props improvements

* Final fixes

app/scenes/Document/components/ReferenceListItem.js

@@ -7,11 +7,11 @@ import Document from "models/Document";
 import DocumentMeta from "components/DocumentMeta";
 import type { NavigationNode } from "types";
 
-type Props = {
+type Props = {|
   document: Document | NavigationNode,
   anchor?: string,
   showCollection?: boolean,
-};
+|};
 
 const DocumentLink = styled(Link)`
   display: block;