feat: allow checking whether a channel has optional tabs (#296)

src/core/TabbedFeed.ts

@@ -47,6 +47,10 @@ class TabbedFeed extends Feed {
     return new TabbedFeed(this.#actions, response.data, false);
   }
 
+  hasTabWithURL(url: string): boolean {
+    return this.#tabs.some((tab) => tab.endpoint.metadata.url?.split('/').pop() === url);
+  }
+
   get title(): string | undefined {
     return this.page.contents_memo.getType(Tab)?.find((tab) => tab.selected)?.title.toString();
   }

src/parser/youtube/Channel.ts

@@ -196,6 +196,26 @@ export default class Channel extends TabbedFeed {
     return new Channel(this.actions, page, true);
   }
 
+  get has_videos(): boolean {
+    return this.hasTabWithURL('videos');
+  }
+
+  get has_shorts(): boolean {
+    return this.hasTabWithURL('shorts');
+  }
+
+  get has_live_streams(): boolean {
+    return this.hasTabWithURL('streams');
+  }
+
+  get has_playlists(): boolean {
+    return this.hasTabWithURL('playlists');
+  }
+
+  get has_community(): boolean {
+    return this.hasTabWithURL('community');
+  }
+
   /**
    * Retrives list continuation.
    */