refactor!: migrate core renderers to TypeScript

src/parser/classes/ItemSectionHeader.ts

@@ -0,0 +1,15 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class ItemSectionHeader extends YTNode {
+  static type = 'ItemSectionHeader';
+
+  title: Text;
+
+  constructor(data: any) {
+    super();
+    this.title = new Text(data.title);
+  }
+}
+
+export default ItemSectionHeader;