feat: extract channel error alert

src/parser/classes/Alert.ts

@@ -0,0 +1,17 @@
+import Text from './misc/Text';
+import { YTNode } from '../helpers';
+
+class Alert extends YTNode {
+  static type = 'Alert';
+
+  text: Text;
+  alert_type: string;
+
+  constructor(data: any) {
+    super();
+    this.text = new Text(data.text);
+    this.alert_type = data.type;
+  }
+}
+
+export default Alert;

src/parser/index.ts

@@ -9,6 +9,7 @@ import type Message from './classes/Message';
 import type LiveChatParticipantsList from './classes/LiveChatParticipantsList';
 import type LiveChatHeader from './classes/LiveChatHeader';
 import type LiveChatItemList from './classes/LiveChatItemList';
+import type Alert from './classes/Alert';
 
 import MusicMultiSelectMenuItem from './classes/menus/MusicMultiSelectMenuItem';
 import Format from './classes/misc/Format';
@@ -137,6 +138,7 @@ export default class Parser {
       metadata: Parser.parse(data.metadata),
       microformat: data.microformat ? Parser.parseItem(data.microformat) : null,
       overlay: Parser.parseItem(data.overlay),
+      alerts: Parser.parseArray<Alert>(data.alerts),
       refinements: data.refinements || null,
       estimated_results: data.estimatedResults ? parseInt(data.estimatedResults) : null,
       player_overlays: Parser.parse(data.playerOverlays),

src/parser/map.ts

@@ -8,6 +8,7 @@ import { default as AccountItemSectionHeader } from './classes/AccountItemSectio
 import { default as AccountSectionList } from './classes/AccountSectionList';
 import { default as AppendContinuationItemsAction } from './classes/actions/AppendContinuationItemsAction';
 import { default as OpenPopupAction } from './classes/actions/OpenPopupAction';
+import { default as Alert } from './classes/Alert';
 import { default as AnalyticsMainAppKeyMetrics } from './classes/analytics/AnalyticsMainAppKeyMetrics';
 import { default as AnalyticsRoot } from './classes/analytics/AnalyticsRoot';
 import { default as AnalyticsShortsCarouselCard } from './classes/analytics/AnalyticsShortsCarouselCard';
@@ -326,6 +327,7 @@ export const YTNodes = {
   AccountSectionList,
   AppendContinuationItemsAction,
   OpenPopupAction,
+  Alert,
   AnalyticsMainAppKeyMetrics,
   AnalyticsRoot,
   AnalyticsShortsCarouselCard,

src/parser/youtube/Channel.ts

@@ -18,7 +18,7 @@ import FeedFilterChipBar from '../classes/FeedFilterChipBar';
 import ChannelSubMenu from '../classes/ChannelSubMenu';
 import SortFilterSubMenu from '../classes/SortFilterSubMenu';
 
-import { InnertubeError } from '../../utils/Utils';
+import { ChannelError, InnertubeError } from '../../utils/Utils';
 
 import type { AppendContinuationItemsAction, ReloadContinuationItemsCommand } from '..';
 
@@ -36,6 +36,13 @@ export default class Channel extends TabbedFeed {
     const metadata = this.page.metadata?.item().as(ChannelMetadata);
     const microformat = this.page.microformat?.as(MicroformatData);
 
+    if (this.page.alerts) {
+      const alert = this.page.alerts.first();
+      if (alert?.alert_type === 'ERROR') {
+        throw new ChannelError(alert.text.toString());
+      }
+    }
+
     if (!metadata && !this.page.contents)
       throw new InnertubeError('Invalid channel', this);
 

src/utils/Utils.ts

@@ -25,6 +25,7 @@ export class MissingParamError extends InnertubeError { }
 export class OAuthError extends InnertubeError { }
 export class PlayerError extends Error { }
 export class SessionError extends Error { }
+export class ChannelError extends Error { }
 
 /**
  * Compares given objects. May not work correctly for