fix: don't show empty folders in movie/tvshow libraries

utils/collectionTypeToItemType.ts

@@ -0,0 +1,53 @@
+import {
+  BaseItemKind,
+  CollectionType,
+} from "@jellyfin/sdk/lib/generated-client";
+
+/**
+ * Converts a ColletionType to a BaseItemKind (also called ItemType)
+ * 
+ * CollectionTypes
+ *  readonly Unknown: "unknown";
+    readonly Movies: "movies";
+    readonly Tvshows: "tvshows";
+    readonly Music: "music";
+    readonly Musicvideos: "musicvideos";
+    readonly Trailers: "trailers";
+    readonly Homevideos: "homevideos";
+    readonly Boxsets: "boxsets";
+    readonly Books: "books";
+    readonly Photos: "photos";
+    readonly Livetv: "livetv";
+    readonly Playlists: "playlists";
+    readonly Folders: "folders";
+ */
+export const colletionTypeToItemType = (
+  collectionType?: CollectionType | null
+): BaseItemKind | undefined => {
+  if (!collectionType) return undefined;
+
+  switch (collectionType) {
+    case CollectionType.Movies:
+      return BaseItemKind.Movie;
+    case CollectionType.Tvshows:
+      return BaseItemKind.Series;
+    case CollectionType.Homevideos:
+      return BaseItemKind.Video;
+    case CollectionType.Musicvideos:
+      return BaseItemKind.MusicVideo;
+    case CollectionType.Books:
+      return BaseItemKind.Book;
+    case CollectionType.Playlists:
+      return BaseItemKind.Playlist;
+    case CollectionType.Folders:
+      return BaseItemKind.Folder;
+    case CollectionType.Photos:
+      return BaseItemKind.Photo;
+    case CollectionType.Trailers:
+      return BaseItemKind.Trailer;
+    case CollectionType.Playlists:
+      return BaseItemKind.Playlist;
+  }
+
+  return undefined;
+};