refactor: migrate parsers to TS (#133)

* dev: finish top-level parsers TS migration

* dev: migrate menu renderers to TS

* chore: fix ts errors

* dev: finish ts migration 🎉

src/parser/classes/ThumbnailOverlayLoadingPreview.ts

@@ -0,0 +1,15 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class ThumbnailOverlayLoadingPreview extends YTNode {
+  static type = 'ThumbnailOverlayLoadingPreview';
+
+  text: Text;
+
+  constructor(data: any) {
+    super();
+    this.text = new Text(data.text);
+  }
+}
+
+export default ThumbnailOverlayLoadingPreview;