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/ExpandableTab.ts

@@ -0,0 +1,22 @@
+import Parser from '../index';
+import NavigationEndpoint from './NavigationEndpoint';
+import { YTNode } from '../helpers';
+
+class ExpandableTab extends YTNode {
+  static type = 'ExpandableTab';
+
+  title: string;
+  endpoint: NavigationEndpoint;
+  selected: boolean;
+  content;
+
+  constructor(data: any) {
+    super();
+    this.title = data.title;
+    this.endpoint = new NavigationEndpoint(data.endpoint);
+    this.selected = data.selected; // If this.selected then we may have content else we do not
+    this.content = data.content ? Parser.parse(data.content) : null;
+  }
+}
+
+export default ExpandableTab;