chore: clean up build steps

src/parser/classes/ProfileColumn.js

@@ -0,0 +1,16 @@
+import Parser from '../index';
+
+import { YTNode } from '../helpers';
+
+class ProfileColumn extends YTNode {
+  static type = 'ProfileColumn';
+  constructor(data) {
+    super();
+    this.items = Parser.parse(data.items);
+  }
+  // XXX: alias for consistency
+  get contents() {
+    return this.items;
+  }
+}
+export default ProfileColumn;