chore: clean up build steps

src/parser/classes/MusicCarouselShelf.js

@@ -0,0 +1,16 @@
+import Parser from '../index';
+
+import { YTNode } from '../helpers';
+
+class MusicCarouselShelf extends YTNode {
+  static type = 'MusicCarouselShelf';
+  constructor(data) {
+    super();
+    this.header = Parser.parse(data.header);
+    this.contents = Parser.parse(data.contents);
+    if (data.numItemsPerColumn) {
+      this.num_items_per_column = data.numItemsPerColumn;
+    }
+  }
+}
+export default MusicCarouselShelf;