Make sure studio is running for build

lib/sanity/desk/category-structure.ts

@@ -0,0 +1,33 @@
+import {ListItemBuilder} from 'sanity/desk'
+import defineStructure from '../utils/define-structure'
+import Iframe from 'sanity-plugin-iframe-pane'
+import {SanityDocument} from 'sanity'
+import {EyeOpenIcon, MasterDetailIcon} from '@sanity/icons'
+import getPreviewUrl from '../utils/get-preview-url'
+
+export default defineStructure<ListItemBuilder>((S) =>
+  S.listItem()
+    .title('Categories')
+    .schemaType('category')
+    .child (
+      S.documentTypeList('category')
+        .child (id =>
+          S.document()
+            .schemaType("category")
+            .id(id)
+            .views([
+              S.view
+                .form()
+                  .icon(MasterDetailIcon),
+              S.view
+                .component(Iframe)
+                .icon(EyeOpenIcon) 
+                .options({
+                  url: (doc: SanityDocument) => getPreviewUrl(doc),
+                })
+                .title('Preview')
+          ])
+        )
+      
+    )
+)