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/MusicDescriptionShelf.ts

@@ -0,0 +1,28 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class MusicDescriptionShelf extends YTNode {
+  static type = 'MusicDescriptionShelf';
+
+  description: Text;
+  max_collapsed_lines?: string;
+  max_expanded_lines?: string;
+  footer: Text;
+
+  constructor(data: any) {
+    super();
+    this.description = new Text(data.description);
+
+    if (this.max_collapsed_lines) {
+      this.max_collapsed_lines = data.maxCollapsedLines;
+    }
+
+    if (this.max_expanded_lines) {
+      this.max_expanded_lines = data.maxExpandedLines;
+    }
+
+    this.footer = new Text(data.footer);
+  }
+}
+
+export default MusicDescriptionShelf;