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/RichShelf.ts

@@ -0,0 +1,21 @@
+import Parser from '../index';
+import NavigationEndpoint from './NavigationEndpoint';
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class RichShelf extends YTNode {
+  static type = 'RichShelf';
+
+  title: Text;
+  contents;
+  endpoint: NavigationEndpoint | null;
+
+  constructor(data: any) {
+    super();
+    this.title = new Text(data.title);
+    this.contents = Parser.parse(data.contents);
+    this.endpoint = data.endpoint ? new NavigationEndpoint(data.endpoint) : null;
+  }
+}
+
+export default RichShelf;