chore(main): release 6.4.1 (#507)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -1,5 +1,57 @@
 # Changelog
 
+## [6.4.1](https://github.com/LuanRT/YouTube.js/compare/v6.4.0...v6.4.1) (2023-10-02)
+
+
+### Bug Fixes
+
+* **Feed:** Do not throw when multiple continuations are present ([8e372d5](https://github.com/LuanRT/YouTube.js/commit/8e372d5c67f148be288bb0485f2c70ec43fbecd0))
+* **Playlist:** Throw a more helpful error when parsing empty responses ([987f506](https://github.com/LuanRT/YouTube.js/commit/987f50604a0163f9a07091ce787995c6f6fddb75))
+
+
+### Performance Improvements
+
+* Cache deciphered n-params by info response ([#505](https://github.com/LuanRT/YouTube.js/issues/505)) ([d2959b3](https://github.com/LuanRT/YouTube.js/commit/d2959b3a55a5081295da4754627913933bbaf1e7))
+* **generator:** Remove duplicate checks in `isMiscType` ([#506](https://github.com/LuanRT/YouTube.js/issues/506)) ([68df321](https://github.com/LuanRT/YouTube.js/commit/68df3218580db10c9a0932c93ff2ce487526ff1e))
+
+## [6.4.0](https://github.com/LuanRT/YouTube.js/compare/v6.3.0...v6.4.0) (2023-09-10)
+
+
+### Features
+
+* Add support for retrieving transcripts ([#500](https://github.com/LuanRT/YouTube.js/issues/500)) ([f94ea6c](https://github.com/LuanRT/YouTube.js/commit/f94ea6cf917f63f30dd66514b22a4cf43b948f07))
+* **PlaylistManager:** add .setName() and .setDescription() functions for editing playlists ([#498](https://github.com/LuanRT/YouTube.js/issues/498)) ([86fb33e](https://github.com/LuanRT/YouTube.js/commit/86fb33ed03a127d9fd4caa695ca97642bffe61bd))
+
+
+### Bug Fixes
+
+* **BackstagePost:** `vote_button` type mismatch ([fba3fc9](https://github.com/LuanRT/YouTube.js/commit/fba3fc971454d66d80d4920fbd60889a221de381))
+
+## [6.3.0](https://github.com/LuanRT/YouTube.js/compare/v6.2.0...v6.3.0) (2023-08-31)
+
+
+### Features
+
+* **ChannelMetadata:** Add `music_artist_name` ([#497](https://github.com/LuanRT/YouTube.js/issues/497)) ([91de6e5](https://github.com/LuanRT/YouTube.js/commit/91de6e5c0e5b27e6d12ce5db2f500c5ff78b9830))
+* **Session:** Add on_behalf_of_user session option. ([#494](https://github.com/LuanRT/YouTube.js/issues/494)) ([8bc2aaa](https://github.com/LuanRT/YouTube.js/commit/8bc2aaa3587fcf79f69eedbc2bf422a4c6fa7eb1))
+
+
+### Bug Fixes
+
+* **CompactMovie:** Add missing import and remove unnecessary console.log ([#496](https://github.com/LuanRT/YouTube.js/issues/496)) ([c26972c](https://github.com/LuanRT/YouTube.js/commit/c26972c42a6368822ac254c00f1bbee5a1542486))
+
+## [6.2.0](https://github.com/LuanRT/YouTube.js/compare/v6.1.0...v6.2.0) (2023-08-29)
+
+
+### Features
+
+* **Session:** Add fallback for session data retrieval ([#490](https://github.com/LuanRT/YouTube.js/issues/490)) ([10c15bf](https://github.com/LuanRT/YouTube.js/commit/10c15bfb9f131a2acea2f26ff3328993d8d8f4aa))
+
+
+### Bug Fixes
+
+* **Format:** Fix `is_original` always being `true` ([#492](https://github.com/LuanRT/YouTube.js/issues/492)) ([0412fa0](https://github.com/LuanRT/YouTube.js/commit/0412fa05ff1f00960b398c2f18d5ce39ce0cb864))
+
 ## [6.1.0](https://github.com/LuanRT/YouTube.js/compare/v6.0.2...v6.1.0) (2023-08-27)
 
 

README.md

@@ -325,6 +325,9 @@ Retrieves video info.
 - `<info>#download(options)`
   - Downloads the video. See [download](#download).
 
+- `<info>#getTranscript()`
+  - Retrieves the video's transcript.
+
 - `<info>#filters`
   - Returns filters that can be applied to the watch next feed.
 

docs/API/playlist.md

@@ -10,6 +10,8 @@ Playlist management class.
   * [.addVideos(playlist_id, video_ids)](#addvideos) 
   * [.removeVideos(playlist_id, video_ids)](#removevideos) 
   * [.moveVideo(playlist_id, moved_video_id, predecessor_video_id)](#movevideo) 
+  * [.setName(playlist_id, name)](#setname) 
+  * [.setDescription(playlist_id, description)](#setdescription) 
 
 <a name="create"></a>
 ### create(title, video_ids)
@@ -69,4 +71,29 @@ Moves a video to a new position within a given playlist.
 | --- | --- | --- |
 | playlist_id | `string` | Playlist id |
 | moved_video_id | `string` | the video to be moved |
-| predecessor_video_id | `string` | the video present in the target position |
+| predecessor_video_id | `string` | the video present in the target position |
+
+<a name="setname"></a>
+### setName(playlist_id, name)
+
+Sets the name / title for the given playlist.
+
+**Returns:** `Promise.<ApiResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| playlist_id | `string` | Playlist id |
+| name | `string` | Name / title |
+
+
+<a name="setdescription"></a>
+### setDescription(playlist_id, description)
+
+Sets the description for the given playlist.
+
+**Returns:** `Promise.<ApiResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| playlist_id | `string` | Playlist id |
+| description | `string` | Description |

docs/updating-the-parser.md

@@ -31,24 +31,22 @@ For example, suppose we have found a new renderer named `verticalListRenderer`.
 > `../classes/VerticalList.ts`
 
 ```ts
-import Parser from '..';
-import { YTNode } from '../helpers';
-import type { RawNode } from '../index.js';
+import Parser, { RawNode } from '../index.js';
+import { YTNode } from '../helpers.js';
 
-class VerticalList extends YTNode {
+export default class VerticalList extends YTNode {
   static type = 'VerticalList';
 
   header;
   contents;
 
   constructor(data: RawNode) {
+    super();
     // parse the data here, ex;
     this.header = Parser.parseItem(data.header);
     this.contents = Parser.parseArray(data.contents);
   }
 }
-
-export default VerticalList;
 ```
 
 You may use the parser's generated class for the new renderer as a starting point for your own implementation.

examples/auth/index.js

@@ -1,4 +1,4 @@
-const { Innertube, UniversalCache } = require('youtubei.js');
+import { Innertube, UniversalCache } from  'youtubei.js';
 
 (async () => {
   const yt = await Innertube.create({

examples/transcript/index.ts

@@ -0,0 +1,16 @@
+import { Innertube } from 'youtubei.js';
+
+(async () => {
+  const yt = await Innertube.create({ generate_session_locally: true });
+
+  const info = await yt.getInfo('hePb00CqvP0');
+
+  const defaultTranscriptInfo = await info.getTranscript();
+
+  console.log(`Got ${defaultTranscriptInfo.selectedLanguage} transcript with ${defaultTranscriptInfo.transcript.content.body.initial_segments.length} lines.`);
+
+  console.log("Fetching Hebrew transcript...");
+
+  const heTranscriptInfo = await defaultTranscriptInfo.selectLanguage('Hebrew');
+  console.log(`Got ${heTranscriptInfo.selectedLanguage} transcript with ${heTranscriptInfo.transcript.content.body.initial_segments.length} lines.`);
+})();

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "youtubei.js",
-  "version": "6.1.0",
+  "version": "6.4.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "youtubei.js",
-      "version": "6.1.0",
+      "version": "6.4.1",
       "funding": [
         "https://github.com/sponsors/LuanRT"
       ],

package.json

@@ -1,6 +1,6 @@
 {
   "name": "youtubei.js",
-  "version": "6.1.0",
+  "version": "6.4.1",
   "description": "A wrapper around YouTube's private API. Supports YouTube, YouTube Music, YouTube Kids and YouTube Studio (WIP).",
   "type": "module",
   "types": "./dist/src/platform/lib.d.ts",

src/Innertube.ts

@@ -36,7 +36,7 @@ import {
 import { GetUnseenCountEndpoint } from './core/endpoints/notification/index.js';
 
 import type { ApiResponse } from './core/Actions.js';
-import type { IBrowseResponse, IParsedResponse } from './parser/types/index.js';
+import { type IBrowseResponse, type IParsedResponse } from './parser/types/index.js';
 import type { INextRequest } from './types/index.js';
 import type { DownloadOptions, FormatOptions } from './types/FormatUtils.js';
 

src/core/Player.ts

@@ -10,6 +10,7 @@ import type { FetchFunction } from '../types/PlatformShim.js';
  */
 export default class Player {
   #nsig_sc;
+  #nsig_cache;
   #sig_sc;
   #sig_sc_timestamp;
   #player_id;
@@ -21,6 +22,8 @@ export default class Player {
     this.#sig_sc_timestamp = signature_timestamp;
 
     this.#player_id = player_id;
+
+    this.#nsig_cache = new Map<string, string>();
   }
 
   static async create(cache: ICache | undefined, fetch: FetchFunction = Platform.shim.fetch): Promise<Player> {
@@ -66,7 +69,7 @@ export default class Player {
     return await Player.fromSource(cache, sig_timestamp, sig_sc, nsig_sc, player_id);
   }
 
-  decipher(url?: string, signature_cipher?: string, cipher?: string): string {
+  decipher(url?: string, signature_cipher?: string, cipher?: string, this_response_nsig_cache?: Map<string, string>): string {
     url = url || signature_cipher || cipher;
 
     if (!url)
@@ -93,15 +96,23 @@ export default class Player {
     const n = url_components.searchParams.get('n');
 
     if (n) {
-      const nsig = Platform.shim.eval(this.#nsig_sc, {
-        nsig: n
-      });
+      let nsig;
 
-      if (typeof nsig !== 'string')
-        throw new PlayerError('Failed to decipher nsig');
+      if (this_response_nsig_cache && this_response_nsig_cache.has(n)) {
+        nsig = this_response_nsig_cache.get(n) as string;
+      } else {
+        nsig = Platform.shim.eval(this.#nsig_sc, {
+          nsig: n
+        });
 
-      if (nsig.startsWith('enhanced_except_')) {
-        console.warn('Warning:\nCould not transform nsig, download may be throttled.\nChanging the InnerTube client to "ANDROID" might help!');
+        if (typeof nsig !== 'string')
+          throw new PlayerError('Failed to decipher nsig');
+
+        if (nsig.startsWith('enhanced_except_')) {
+          console.warn('Warning:\nCould not transform nsig, download may be throttled.\nChanging the InnerTube client to "ANDROID" might help!');
+        } else if (this_response_nsig_cache) {
+          this_response_nsig_cache.set(n, nsig);
+        }
       }
 
       url_components.searchParams.set('n', nsig);

src/core/Session.ts

@@ -63,6 +63,7 @@ export interface Context {
   user: {
     enableSafetyMode: boolean;
     lockedSafetyMode: boolean;
+    onBehalfOfUser?: string;
   };
   thirdParty?: {
     embedUrl: string;
@@ -84,6 +85,10 @@ export interface SessionOptions {
    * Only works if you are signed in with cookies.
    */
   account_index?: number;
+  /**
+   * Specify the Page ID of the YouTube profile/channel to use, if the logged-in account has multiple profiles.
+   */
+  on_behalf_of_user?: string;
   /**
    * Specifies whether to retrieve the JS player. Disabling this will make session creation faster.
    * **NOTE:** Deciphering formats is not possible without the JS player.
@@ -193,7 +198,8 @@ export default class Session extends EventEmitterLike {
       options.device_category,
       options.client_type,
       options.timezone,
-      options.fetch
+      options.fetch,
+      options.on_behalf_of_user
     );
 
     return new Session(
@@ -213,14 +219,22 @@ export default class Session extends EventEmitterLike {
     device_category: DeviceCategory = 'desktop',
     client_name: ClientType = ClientType.WEB,
     tz: string = Intl.DateTimeFormat().resolvedOptions().timeZone,
-    fetch: FetchFunction = Platform.shim.fetch
+    fetch: FetchFunction = Platform.shim.fetch,
+    on_behalf_of_user?: string
   ) {
     let session_data: SessionData;
 
+    const session_args = { lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data, on_behalf_of_user };
+
     if (generate_session_locally) {
-      session_data = this.#generateSessionData({ lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data });
+      session_data = this.#generateSessionData(session_args);
     } else {
-      session_data = await this.#retrieveSessionData({ lang, location, time_zone: tz, device_category, client_name, enable_safety_mode, visitor_data }, fetch);
+      try {
+        // This can fail if the data changes or the request is blocked for some reason.
+        session_data = await this.#retrieveSessionData(session_args, fetch);
+      } catch (err) {
+        session_data = this.#generateSessionData(session_args);
+      }
     }
 
     return { ...session_data, account_index };
@@ -234,6 +248,7 @@ export default class Session extends EventEmitterLike {
     client_name: string;
     enable_safety_mode: boolean;
     visitor_data: string;
+    on_behalf_of_user?: string;
   }, fetch: FetchFunction = Platform.shim.fetch): Promise<SessionData> {
     const url = new URL('/sw.js_data', Constants.URLS.YT_BASE);
 
@@ -293,7 +308,8 @@ export default class Session extends EventEmitterLike {
       },
       user: {
         enableSafetyMode: options.enable_safety_mode,
-        lockedSafetyMode: false
+        lockedSafetyMode: false,
+        onBehalfOfUser: options.on_behalf_of_user
       }
     };
 
@@ -308,6 +324,7 @@ export default class Session extends EventEmitterLike {
     client_name: string;
     enable_safety_mode: boolean;
     visitor_data: string;
+    on_behalf_of_user?: string;
   }): SessionData {
     let visitor_id = generateRandomString(11);
 
@@ -340,7 +357,8 @@ export default class Session extends EventEmitterLike {
       },
       user: {
         enableSafetyMode: options.enable_safety_mode,
-        lockedSafetyMode: false
+        lockedSafetyMode: false,
+        onBehalfOfUser: options.on_behalf_of_user
       }
     };
 

src/core/endpoints/browse/EditPlaylistEndpoint.ts

@@ -15,7 +15,9 @@ export function build(opts: EditPlaylistEndpointOptions): IEditPlaylistRequest {
       ...{
         addedVideoId: action.added_video_id,
         setVideoId: action.set_video_id,
-        movedSetVideoIdPredecessor: action.moved_set_video_id_predecessor
+        movedSetVideoIdPredecessor: action.moved_set_video_id_predecessor,
+        playlistDescription: action.playlist_description,
+        playlistName: action.playlist_name
       }
     }))
   };

src/core/managers/PlaylistManager.ts

@@ -200,4 +200,60 @@ export default class PlaylistManager {
       action_result: response.data.actions // TODO: implement actions in the parser
     };
   }
-}
+
+  /**
+   * Sets the name (title) for the given playlist.
+   * @param playlist_id - The playlist ID.
+   * @param name - The name / title to use for the playlist.
+   */
+  async setName(playlist_id: string, name: string): Promise<{ playlist_id: string; action_result: any; }> {
+    throwIfMissing({ playlist_id, name });
+
+    if (!this.#actions.session.logged_in)
+      throw new InnertubeError('You must be signed in to perform this operation.');
+
+    const payload: EditPlaylistEndpointOptions = { playlist_id, actions: [] };
+
+    payload.actions.push({
+      action: 'ACTION_SET_PLAYLIST_NAME',
+      playlist_name: name
+    });
+
+    const response = await this.#actions.execute(
+      EditPlaylistEndpoint.PATH, EditPlaylistEndpoint.build(payload)
+    );
+
+    return {
+      playlist_id,
+      action_result: response.data.actions
+    };
+  }
+
+  /**
+   * Sets the description for the given playlist.
+   * @param playlist_id - The playlist ID.
+   * @param description - The description to use for the playlist.
+   */
+  async setDescription(playlist_id: string, description: string): Promise<{ playlist_id: string; action_result: any; }> {
+    throwIfMissing({ playlist_id, description });
+
+    if (!this.#actions.session.logged_in)
+      throw new InnertubeError('You must be signed in to perform this operation.');
+
+    const payload: EditPlaylistEndpointOptions = { playlist_id, actions: [] };
+
+    payload.actions.push({
+      action: 'ACTION_SET_PLAYLIST_DESCRIPTION',
+      playlist_description: description
+    });
+
+    const response = await this.#actions.execute(
+      EditPlaylistEndpoint.PATH, EditPlaylistEndpoint.build(payload)
+    );
+
+    return {
+      playlist_id,
+      action_result: response.data.actions
+    };
+  }
+}

src/core/mixins/Feed.ts

@@ -185,10 +185,8 @@ export default class Feed<T extends IParsedResponse = IParsedResponse> {
    */
   async getContinuationData(): Promise<T | undefined> {
     if (this.#continuation) {
-      if (this.#continuation.length > 1)
-        throw new InnertubeError('There are too many continuations, you\'ll need to find the correct one yourself in this.page');
       if (this.#continuation.length === 0)
-        throw new InnertubeError('There are no continuations');
+        throw new InnertubeError('There are no continuations.');
 
       const response = await this.#continuation[0].endpoint.call<T>(this.#actions, { parse: true });
 

src/core/mixins/MediaInfo.ts

@@ -10,6 +10,8 @@ import Parser from '../../parser/index.js';
 import type { DashOptions } from '../../types/DashOptions.js';
 import PlayerStoryboardSpec from '../../parser/classes/PlayerStoryboardSpec.js';
 import { getStreamingInfo } from '../../utils/StreamingInfo.js';
+import ContinuationItem from '../../parser/classes/ContinuationItem.js';
+import TranscriptInfo from '../../parser/youtube/TranscriptInfo.js';
 
 export default class MediaInfo {
   #page: [IPlayerResponse, INextResponse?];
@@ -84,6 +86,36 @@ export default class MediaInfo {
     return FormatUtils.download(options, this.#actions, this.playability_status, this.streaming_data, this.#actions.session.player, this.cpn);
   }
 
+  /**
+   * Retrieves the video's transcript.
+   * @param video_id - The video id.
+   */
+  async getTranscript(): Promise<TranscriptInfo> {
+    const next_response = this.page[1];
+
+    if (!next_response)
+      throw new InnertubeError('Cannot get transcript from basic video info.');
+
+    if (!next_response.engagement_panels)
+      throw new InnertubeError('Engagement panels not found. Video likely has no transcript.');
+
+    const transcript_panel = next_response.engagement_panels.get({
+      panel_identifier: 'engagement-panel-searchable-transcript'
+    });
+
+    if (!transcript_panel)
+      throw new InnertubeError('Transcript panel not found. Video likely has no transcript.');
+
+    const transcript_continuation = transcript_panel.content?.as(ContinuationItem);
+
+    if (!transcript_continuation)
+      throw new InnertubeError('Transcript continuation not found.');
+
+    const response = await transcript_continuation.endpoint.call(this.actions);
+
+    return new TranscriptInfo(this.actions, response);
+  }
+
   /**
    * Adds video to the watch history.
    */

src/parser/classes/BackstagePost.ts

@@ -1,5 +1,6 @@
 import { YTNode } from '../helpers.js';
 import Parser, { type RawNode } from '../index.js';
+import Button from './Button.js';
 import NavigationEndpoint from './NavigationEndpoint.js';
 import CommentActionButtons from './comments/CommentActionButtons.js';
 import Menu from './menus/Menu.js';
@@ -18,7 +19,7 @@ export default class BackstagePost extends YTNode {
   vote_count?: Text;
   menu?: Menu | null;
   action_buttons?: CommentActionButtons | null;
-  vote_button?: CommentActionButtons | null;
+  vote_button?: Button | null;
   surface: string;
   endpoint?: NavigationEndpoint;
   attachment;
@@ -56,7 +57,7 @@ export default class BackstagePost extends YTNode {
     }
 
     if (Reflect.has(data, 'voteButton')) {
-      this.vote_button = Parser.parseItem(data.voteButton, CommentActionButtons);
+      this.vote_button = Parser.parseItem(data.voteButton, Button);
     }
 
     if (Reflect.has(data, 'navigationEndpoint')) {

src/parser/classes/ChannelMetadata.ts

@@ -14,6 +14,7 @@ export default class ChannelMetadata extends YTNode {
   is_family_safe: boolean;
   keywords: string[];
   avatar: Thumbnail[];
+  music_artist_name?: string;
   available_countries: string[];
   android_deep_link: string;
   android_appindexing_link: string;
@@ -30,6 +31,8 @@ export default class ChannelMetadata extends YTNode {
     this.is_family_safe = data.isFamilySafe;
     this.keywords = data.keywords;
     this.avatar = Thumbnail.fromResponse(data.avatar);
+    // Can be an empty string sometimes, so we need the extra length check
+    this.music_artist_name = typeof data.musicArtistName === 'string' && data.musicArtistName.length > 0 ? data.musicArtistName : undefined;
     this.available_countries = data.availableCountryCodes;
     this.android_deep_link = data.androidDeepLink;
     this.android_appindexing_link = data.androidAppindexingLink;

src/parser/classes/CompactMovie.ts

@@ -3,6 +3,7 @@ import type { RawNode } from '../index.js';
 import Parser from '../index.js';
 import Author from './misc/Author.js';
 import NavigationEndpoint from './NavigationEndpoint.js';
+import Text from './misc/Text.js';
 import Thumbnail from './misc/Thumbnail.js';
 import Menu from './menus/Menu.js';
 import { timeToSeconds } from '../../utils/Utils.js';
@@ -29,7 +30,6 @@ export default class CompactMovie extends YTNode {
 
   constructor(data: RawNode) {
     super();
-    console.log(data);
     const overlay_time_status = data.thumbnailOverlays
       .find((overlay: RawNode) => overlay.thumbnailOverlayTimeStatusRenderer)
       ?.thumbnailOverlayTimeStatusRenderer.text || 'N/A';

src/parser/classes/EngagementPanelSectionList.ts

@@ -3,6 +3,7 @@ import Parser, { type RawNode } from '../index.js';
 import ContinuationItem from './ContinuationItem.js';
 import EngagementPanelTitleHeader from './EngagementPanelTitleHeader.js';
 import MacroMarkersList from './MacroMarkersList.js';
+import ProductList from './ProductList.js';
 import SectionList from './SectionList.js';
 import StructuredDescriptionContent from './StructuredDescriptionContent.js';
 
@@ -10,7 +11,7 @@ export default class EngagementPanelSectionList extends YTNode {
   static type = 'EngagementPanelSectionList';
 
   header: EngagementPanelTitleHeader | null;
-  content: SectionList | ContinuationItem | StructuredDescriptionContent | MacroMarkersList | null;
+  content: SectionList | ContinuationItem | StructuredDescriptionContent | MacroMarkersList | ProductList | null;
   target_id?: string;
   panel_identifier?: string;
   visibility?: string;
@@ -18,9 +19,9 @@ export default class EngagementPanelSectionList extends YTNode {
   constructor(data: RawNode) {
     super();
     this.header = Parser.parseItem(data.header, EngagementPanelTitleHeader);
-    this.content = Parser.parseItem(data.content, [ SectionList, ContinuationItem, StructuredDescriptionContent, MacroMarkersList ]);
+    this.content = Parser.parseItem(data.content, [ SectionList, ContinuationItem, StructuredDescriptionContent, MacroMarkersList, ProductList ]);
     this.panel_identifier = data.panelIdentifier;
     this.target_id = data.targetId;
     this.visibility = data.visibility;
   }
-}
+}

src/parser/classes/ExpandableMetadata.ts

@@ -2,6 +2,7 @@ import { YTNode } from '../helpers.js';
 import Parser, { type RawNode } from '../index.js';
 import Button from './Button.js';
 import HorizontalCardList from './HorizontalCardList.js';
+import HorizontalList from './HorizontalList.js';
 import Text from './misc/Text.js';
 import Thumbnail from './misc/Thumbnail.js';
 
@@ -15,7 +16,7 @@ export default class ExpandableMetadata extends YTNode {
     expanded_title: Text;
   };
 
-  expanded_content: HorizontalCardList | null;
+  expanded_content: HorizontalCardList | HorizontalList | null;
   expand_button: Button | null;
   collapse_button: Button | null;
 
@@ -31,7 +32,7 @@ export default class ExpandableMetadata extends YTNode {
       };
     }
 
-    this.expanded_content = Parser.parseItem(data.expandedContent, HorizontalCardList);
+    this.expanded_content = Parser.parseItem(data.expandedContent, [ HorizontalCardList, HorizontalList ]);
     this.expand_button = Parser.parseItem(data.expandButton, Button);
     this.collapse_button = Parser.parseItem(data.collapseButton, Button);
   }

src/parser/classes/FancyDismissibleDialog.ts

@@ -0,0 +1,16 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import { Text } from '../misc.js';
+
+export default class FancyDismissibleDialog extends YTNode {
+  static type = 'FancyDismissibleDialog';
+
+  dialog_message: Text;
+  confirm_label: Text;
+
+  constructor(data: RawNode) {
+    super();
+    this.dialog_message = new Text(data.dialogMessage);
+    this.confirm_label = new Text(data.confirmLabel);
+  }
+}

src/parser/classes/ProductList.ts

@@ -0,0 +1,15 @@
+import type { ObservedArray} from '../helpers.js';
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+
+export default class ProductList extends YTNode {
+  static type = 'ProductList';
+
+  contents: ObservedArray<YTNode>;
+
+  constructor(data: RawNode) {
+    super();
+    this.contents = Parser.parseArray(data.contents);
+  }
+}

src/parser/classes/ProductListHeader.ts

@@ -0,0 +1,16 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import { Text } from '../misc.js';
+
+export default class ProductListHeader extends YTNode {
+  static type = 'ProductListHeader';
+
+  title: Text;
+  suppress_padding_disclaimer: boolean;
+
+  constructor(data: RawNode) {
+    super();
+    this.title = new Text(data.title);
+    this.suppress_padding_disclaimer = !!data.suppressPaddingDisclaimer;
+  }
+}

src/parser/classes/ProductListItem.ts

@@ -0,0 +1,31 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import { Text, Thumbnail } from '../misc.js';
+import Button from './Button.js';
+import NavigationEndpoint from './NavigationEndpoint.js';
+
+export default class ProductListItem extends YTNode {
+  static type = 'ProductListItem';
+
+  title: Text;
+  accessibility_title: string;
+  thumbnail: Thumbnail[];
+  price: string;
+  endpoint: NavigationEndpoint;
+  merchant_name: string;
+  stay_in_app: boolean;
+  view_button: Button | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.title = new Text(data.title);
+    this.accessibility_title = data.accessibilityTitle;
+    this.thumbnail = Thumbnail.fromResponse(data.thumbnail);
+    this.price = data.price;
+    this.endpoint = new NavigationEndpoint(data.onClickCommand);
+    this.merchant_name = data.merchantName;
+    this.stay_in_app = !!data.stayInApp;
+    this.view_button = Parser.parseItem(data.viewButton, Button);
+  }
+}

src/parser/classes/StructuredDescriptionContent.ts

@@ -5,14 +5,24 @@ import HorizontalCardList from './HorizontalCardList.js';
 import VideoDescriptionHeader from './VideoDescriptionHeader.js';
 import VideoDescriptionInfocardsSection from './VideoDescriptionInfocardsSection.js';
 import VideoDescriptionMusicSection from './VideoDescriptionMusicSection.js';
+import VideoDescriptionTranscriptSection from './VideoDescriptionTranscriptSection.js';
+import VideoDescriptionCourseSection from './VideoDescriptionCourseSection.js';
 
 export default class StructuredDescriptionContent extends YTNode {
   static type = 'StructuredDescriptionContent';
 
-  items: ObservedArray<VideoDescriptionHeader | ExpandableVideoDescriptionBody | VideoDescriptionMusicSection | VideoDescriptionInfocardsSection | HorizontalCardList>;
+  items: ObservedArray<
+    VideoDescriptionHeader | ExpandableVideoDescriptionBody | VideoDescriptionMusicSection |
+    VideoDescriptionInfocardsSection | VideoDescriptionTranscriptSection | VideoDescriptionTranscriptSection |
+    VideoDescriptionCourseSection | HorizontalCardList
+  >;
 
   constructor(data: RawNode) {
     super();
-    this.items = Parser.parseArray(data.items, [ VideoDescriptionHeader, ExpandableVideoDescriptionBody, VideoDescriptionMusicSection, VideoDescriptionInfocardsSection, HorizontalCardList ]);
+    this.items = Parser.parseArray(data.items, [
+      VideoDescriptionHeader, ExpandableVideoDescriptionBody, VideoDescriptionMusicSection,
+      VideoDescriptionInfocardsSection, VideoDescriptionCourseSection, VideoDescriptionTranscriptSection,
+      VideoDescriptionTranscriptSection, HorizontalCardList
+    ]);
   }
 }

src/parser/classes/StructuredDescriptionPlaylistLockup.ts

@@ -0,0 +1,34 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import NavigationEndpoint from './NavigationEndpoint.js';
+import Text from './misc/Text.js';
+import Thumbnail from './misc/Thumbnail.js';
+
+export default class StructuredDescriptionPlaylistLockup extends YTNode {
+  static type = 'StructuredDescriptionPlaylistLockup';
+
+  thumbnail: Thumbnail[];
+  title: Text;
+  short_byline_text: Text;
+  video_count_short_text: Text;
+  endpoint: NavigationEndpoint;
+  thumbnail_width: number;
+  aspect_ratio: number;
+  max_lines_title: number;
+  max_lines_short_byline_text: number;
+  overlay_position: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.thumbnail = Thumbnail.fromResponse(data.thumbnail);
+    this.title = new Text(data.title);
+    this.short_byline_text = new Text(data.shortBylineText);
+    this.video_count_short_text = new Text(data.videoCountShortText);
+    this.endpoint = new NavigationEndpoint(data.navigationEndpoint);
+    this.thumbnail_width = data.thumbnailWidth;
+    this.aspect_ratio = data.aspectRatio;
+    this.max_lines_title = data.maxLinesTitle;
+    this.max_lines_short_byline_text = data.maxLinesShortBylineText;
+    this.overlay_position = data.overlayPosition;
+  }
+}

src/parser/classes/Transcript.ts

@@ -0,0 +1,15 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import TranscriptSearchPanel from './TranscriptSearchPanel.js';
+
+export default class Transcript extends YTNode {
+  static type = 'Transcript';
+
+  content: TranscriptSearchPanel | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.content = Parser.parseItem(data.content, TranscriptSearchPanel);
+  }
+}

src/parser/classes/TranscriptFooter.ts

@@ -0,0 +1,15 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import SortFilterSubMenu from './SortFilterSubMenu.js';
+
+export default class TranscriptFooter extends YTNode {
+  static type = 'TranscriptFooter';
+
+  language_menu: SortFilterSubMenu | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.language_menu = Parser.parseItem(data.languageMenu, SortFilterSubMenu);
+  }
+}

src/parser/classes/TranscriptSearchBox.ts

@@ -0,0 +1,23 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import Button from './Button.js';
+import NavigationEndpoint from './NavigationEndpoint.js';
+import { Text } from '../misc.js';
+
+export default class TranscriptSearchBox extends YTNode {
+  static type = 'TranscriptSearchBox';
+
+  formatted_placeholder: Text;
+  clear_button: Button | null;
+  endpoint: NavigationEndpoint;
+  search_button: Button | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.formatted_placeholder = new Text(data.formattedPlaceholder);
+    this.clear_button = Parser.parseItem(data.clearButton, Button);
+    this.endpoint = new NavigationEndpoint(data.onTextChangeCommand);
+    this.search_button = Parser.parseItem(data.searchButton, Button);
+  }
+}

src/parser/classes/TranscriptSearchPanel.ts

@@ -0,0 +1,23 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import TranscriptFooter from './TranscriptFooter.js';
+import TranscriptSearchBox from './TranscriptSearchBox.js';
+import TranscriptSegmentList from './TranscriptSegmentList.js';
+
+export default class TranscriptSearchPanel extends YTNode {
+  static type = 'TranscriptSearchPanel';
+
+  header: TranscriptSearchBox | null;
+  body: TranscriptSegmentList | null;
+  footer: TranscriptFooter | null;
+  target_id: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.header = Parser.parseItem(data.header, TranscriptSearchBox);
+    this.body = Parser.parseItem(data.body, TranscriptSegmentList);
+    this.footer = Parser.parseItem(data.footer, TranscriptFooter);
+    this.target_id = data.targetId;
+  }
+}

src/parser/classes/TranscriptSectionHeader.ts

@@ -0,0 +1,18 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Text from './misc/Text.js';
+
+export default class TranscriptSectionHeader extends YTNode {
+  static type = 'TranscriptSectionHeader';
+
+  start_ms: string;
+  end_ms: string;
+  snippet: Text;
+
+  constructor(data: RawNode) {
+    super();
+    this.start_ms = data.startMs;
+    this.end_ms = data.endMs;
+    this.snippet = new Text(data.snippet);
+  }
+}

src/parser/classes/TranscriptSegment.ts

@@ -0,0 +1,22 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import { Text } from '../misc.js';
+
+export default class TranscriptSegment extends YTNode {
+  static type = 'TranscriptSegment';
+
+  start_ms: string;
+  end_ms: string;
+  snippet: Text;
+  start_time_text: Text;
+  target_id: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.start_ms = data.startMs;
+    this.end_ms = data.endMs;
+    this.snippet = new Text(data.snippet);
+    this.start_time_text = new Text(data.startTimeText);
+    this.target_id = data.targetId;
+  }
+}

src/parser/classes/TranscriptSegmentList.ts

@@ -0,0 +1,24 @@
+import type { ObservedArray } from '../helpers.js';
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import { Text } from '../misc.js';
+import TranscriptSectionHeader from './TranscriptSectionHeader.js';
+import TranscriptSegment from './TranscriptSegment.js';
+
+export default class TranscriptSegmentList extends YTNode {
+  static type = 'TranscriptSegmentList';
+
+  initial_segments: ObservedArray<TranscriptSegment | TranscriptSectionHeader>;
+  no_result_label: Text;
+  retry_label: Text;
+  touch_captions_enabled: boolean;
+
+  constructor(data: RawNode) {
+    super();
+    this.initial_segments = Parser.parseArray(data.initialSegments, [ TranscriptSegment, TranscriptSectionHeader ]);
+    this.no_result_label = new Text(data.noResultLabel);
+    this.retry_label = new Text(data.retryLabel);
+    this.touch_captions_enabled = data.touchCaptionsEnabled;
+  }
+}

src/parser/classes/UploadTimeFactoid.ts

@@ -0,0 +1,15 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import Factoid from './Factoid.js';
+
+export default class UploadTimeFactoid extends YTNode {
+  static type = 'UploadTimeFactoid';
+
+  factoid: Factoid | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.factoid = Parser.parseItem(data.factoid, Factoid);
+  }
+}

src/parser/classes/VideoDescriptionCourseSection.ts

@@ -0,0 +1,19 @@
+import type { ObservedArray} from '../helpers.js';
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import StructuredDescriptionPlaylistLockup from './StructuredDescriptionPlaylistLockup.js';
+import Text from './misc/Text.js';
+
+export default class VideoDescriptionCourseSection extends YTNode {
+  static type = 'VideoDescriptionCourseSection';
+
+  section_title: Text;
+  media_lockups: ObservedArray<StructuredDescriptionPlaylistLockup>;
+
+  constructor(data: RawNode) {
+    super();
+    this.section_title = new Text(data.sectionTitle);
+    this.media_lockups = Parser.parseArray(data.mediaLockups, [ StructuredDescriptionPlaylistLockup ]);
+  }
+}

src/parser/classes/VideoDescriptionHeader.ts

@@ -3,6 +3,8 @@ import Parser, { type RawNode } from '../index.js';
 import { Text, Thumbnail } from '../misc.js';
 import Factoid from './Factoid.js';
 import NavigationEndpoint from './NavigationEndpoint.js';
+import UploadTimeFactoid from './UploadTimeFactoid.js';
+import ViewCountFactoid from './ViewCountFactoid.js';
 
 export default class VideoDescriptionHeader extends YTNode {
   static type = 'VideoDescriptionHeader';
@@ -10,7 +12,7 @@ export default class VideoDescriptionHeader extends YTNode {
   channel: Text;
   channel_navigation_endpoint?: NavigationEndpoint;
   channel_thumbnail: Thumbnail[];
-  factoids: ObservedArray<Factoid>;
+  factoids: ObservedArray<Factoid | ViewCountFactoid | UploadTimeFactoid>;
   publish_date: Text;
   title: Text;
   views: Text;
@@ -23,6 +25,6 @@ export default class VideoDescriptionHeader extends YTNode {
     this.channel_thumbnail = Thumbnail.fromResponse(data.channelThumbnail);
     this.publish_date = new Text(data.publishDate);
     this.views = new Text(data.views);
-    this.factoids = Parser.parseArray(data.factoid, Factoid);
+    this.factoids = Parser.parseArray(data.factoid, [ Factoid, ViewCountFactoid, UploadTimeFactoid ]);
   }
 }

src/parser/classes/VideoDescriptionTranscriptSection.ts

@@ -0,0 +1,20 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import { Text } from '../misc.js';
+import Button from './Button.js';
+
+export default class VideoDescriptionTranscriptSection extends YTNode {
+  static type = 'VideoDescriptionTranscriptSection';
+
+  section_title: Text;
+  sub_header_text: Text;
+  primary_button: Button | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.section_title = new Text(data.sectionTitle);
+    this.sub_header_text = new Text(data.subHeaderText);
+    this.primary_button = Parser.parseItem(data.primaryButton, Button);
+  }
+}

src/parser/classes/ViewCountFactoid.ts

@@ -0,0 +1,19 @@
+import { YTNode } from '../helpers.js';
+import type { RawNode } from '../index.js';
+import Parser from '../index.js';
+import Factoid from './Factoid.js';
+
+export default class ViewCountFactoid extends YTNode {
+  static type = 'ViewCountFactoid';
+
+  view_count_entity_key: string;
+  factoid: Factoid | null;
+  view_count_type: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.view_count_entity_key = data.viewCountEntityKey;
+    this.factoid = Parser.parseItem(data.factoid, [ Factoid ]);
+    this.view_count_type = data.viewCountType;
+  }
+}

src/parser/classes/actions/UpdateEngagementPanelAction.ts

@@ -0,0 +1,17 @@
+import { YTNode } from '../../helpers.js';
+import type { RawNode } from '../../index.js';
+import Parser from '../../index.js';
+import Transcript from '../Transcript.js';
+
+export default class UpdateEngagementPanelAction extends YTNode {
+  static type = 'UpdateEngagementPanelAction';
+
+  target_id: string;
+  content: Transcript | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.target_id = data.targetId;
+    this.content = Parser.parseItem(data.content, Transcript);
+  }
+}

src/parser/classes/menus/MenuPopup.ts

@@ -0,0 +1,17 @@
+import type { ObservedArray} from '../../helpers.js';
+import { YTNode } from '../../helpers.js';
+import type { RawNode } from '../../index.js';
+import Parser from '../../index.js';
+import MenuNavigationItem from './MenuNavigationItem.js';
+import MenuServiceItem from './MenuServiceItem.js';
+
+export default class MenuPopup extends YTNode {
+  static type = 'MenuPopup';
+
+  items: ObservedArray<MenuNavigationItem | MenuServiceItem>;
+
+  constructor(data: RawNode) {
+    super();
+    this.items = Parser.parseArray(data.items, [ MenuNavigationItem, MenuServiceItem ]);
+  }
+}

src/parser/classes/misc/Format.ts

@@ -3,6 +3,8 @@ import { InnertubeError } from '../../../utils/Utils.js';
 import type { RawNode } from '../../index.js';
 
 export default class Format {
+  #this_response_nsig_cache?: Map<string, string>;
+
   itag: number;
   mime_type: string;
   is_type_otf: boolean;
@@ -52,7 +54,11 @@ export default class Format {
     matrix_coefficients?: string;
   };
 
-  constructor(data: RawNode) {
+  constructor(data: RawNode, this_response_nsig_cache?: Map<string, string>) {
+    if (this_response_nsig_cache) {
+      this.#this_response_nsig_cache = this_response_nsig_cache;
+    }
+
     this.itag = data.itag;
     this.mime_type = data.mimeType;
     this.is_type_otf = data.type === 'FORMAT_STREAM_TYPE_OTF';
@@ -104,7 +110,7 @@ export default class Format {
       this.language = xtags?.find((x: string) => x.startsWith('lang='))?.split('=')[1] || null;
       this.is_dubbed = audio_content === 'dubbed';
       this.is_descriptive = audio_content === 'descriptive';
-      this.is_original = audio_content === 'original' || !this.is_dubbed || !this.is_descriptive;
+      this.is_original = audio_content === 'original' || (!this.is_dubbed && !this.is_descriptive);
 
       if (Reflect.has(data, 'audioTrack')) {
         this.audio_track = {
@@ -122,6 +128,6 @@ export default class Format {
    */
   decipher(player: Player | undefined): string {
     if (!player) throw new InnertubeError('Cannot decipher format, this session appears to have no valid player.');
-    return player.decipher(this.url, this.signature_cipher, this.cipher);
+    return player.decipher(this.url, this.signature_cipher, this.cipher, this.#this_response_nsig_cache);
   }
 }

src/parser/generator.ts

@@ -134,33 +134,35 @@ export function isRendererList(value: unknown) {
  * @returns If it is a misc type, return the InferenceType. Otherwise, return false.
  */
 export function isMiscType(key: string, value: unknown): MiscInferenceType | false {
-  // NavigationEndpoint
-  if ((key.endsWith('Endpoint') || key.endsWith('Command') || key === 'endpoint') && typeof value === 'object' && value !== null) {
-    return {
-      type: 'misc',
-      endpoint: new NavigationEndpoint(value),
-      optional: false,
-      misc_type: 'NavigationEndpoint'
-    };
-  }
-  // Text
-  if (typeof value === 'object' && value !== null && (Reflect.has(value, 'simpleText') || Reflect.has(value, 'runs'))) {
-    const textNode = new Text(value);
-    return {
-      type: 'misc',
-      misc_type: 'Text',
-      optional: false,
-      endpoint: textNode.endpoint,
-      text: textNode.toString()
-    };
-  }
-  // Thumbnail
-  if (typeof value === 'object' && value !== null && Reflect.has(value, 'thumbnails') && Array.isArray(Reflect.get(value, 'thumbnails'))) {
-    return {
-      type: 'misc',
-      misc_type: 'Thumbnail',
-      optional: false
-    };
+  if (typeof value === 'object' && value !== null) {
+    // NavigationEndpoint
+    if (key.endsWith('Endpoint') || key.endsWith('Command') || key === 'endpoint') {
+      return {
+        type: 'misc',
+        endpoint: new NavigationEndpoint(value),
+        optional: false,
+        misc_type: 'NavigationEndpoint'
+      };
+    }
+    // Text
+    if (Reflect.has(value, 'simpleText') || Reflect.has(value, 'runs')) {
+      const textNode = new Text(value);
+      return {
+        type: 'misc',
+        misc_type: 'Text',
+        optional: false,
+        endpoint: textNode.endpoint,
+        text: textNode.toString()
+      };
+    }
+    // Thumbnail
+    if (Reflect.has(value, 'thumbnails') && Array.isArray(Reflect.get(value, 'thumbnails'))) {
+      return {
+        type: 'misc',
+        misc_type: 'Thumbnail',
+        optional: false
+      };
+    }
   }
   return false;
 }

src/parser/nodes.ts

@@ -7,6 +7,7 @@ export { default as AccountItemSectionHeader } from './classes/AccountItemSectio
 export { default as AccountSectionList } from './classes/AccountSectionList.js';
 export { default as AppendContinuationItemsAction } from './classes/actions/AppendContinuationItemsAction.js';
 export { default as OpenPopupAction } from './classes/actions/OpenPopupAction.js';
+export { default as UpdateEngagementPanelAction } from './classes/actions/UpdateEngagementPanelAction.js';
 export { default as Alert } from './classes/Alert.js';
 export { default as AlertWithButton } from './classes/AlertWithButton.js';
 export { default as AnalyticsMainAppKeyMetrics } from './classes/analytics/AnalyticsMainAppKeyMetrics.js';
@@ -102,6 +103,7 @@ export { default as ExpandableTab } from './classes/ExpandableTab.js';
 export { default as ExpandableVideoDescriptionBody } from './classes/ExpandableVideoDescriptionBody.js';
 export { default as ExpandedShelfContents } from './classes/ExpandedShelfContents.js';
 export { default as Factoid } from './classes/Factoid.js';
+export { default as FancyDismissibleDialog } from './classes/FancyDismissibleDialog.js';
 export { default as FeedFilterChipBar } from './classes/FeedFilterChipBar.js';
 export { default as FeedTabbedHeader } from './classes/FeedTabbedHeader.js';
 export { default as GameCard } from './classes/GameCard.js';
@@ -191,6 +193,7 @@ export { default as MacroMarkersList } from './classes/MacroMarkersList.js';
 export { default as MacroMarkersListItem } from './classes/MacroMarkersListItem.js';
 export { default as Menu } from './classes/menus/Menu.js';
 export { default as MenuNavigationItem } from './classes/menus/MenuNavigationItem.js';
+export { default as MenuPopup } from './classes/menus/MenuPopup.js';
 export { default as MenuServiceItem } from './classes/menus/MenuServiceItem.js';
 export { default as MenuServiceItemDownload } from './classes/menus/MenuServiceItemDownload.js';
 export { default as MultiPageMenu } from './classes/menus/MultiPageMenu.js';
@@ -274,6 +277,9 @@ export { default as PlaylistVideoThumbnail } from './classes/PlaylistVideoThumbn
 export { default as Poll } from './classes/Poll.js';
 export { default as Post } from './classes/Post.js';
 export { default as PostMultiImage } from './classes/PostMultiImage.js';
+export { default as ProductList } from './classes/ProductList.js';
+export { default as ProductListHeader } from './classes/ProductListHeader.js';
+export { default as ProductListItem } from './classes/ProductListItem.js';
 export { default as ProfileColumn } from './classes/ProfileColumn.js';
 export { default as ProfileColumnStats } from './classes/ProfileColumnStats.js';
 export { default as ProfileColumnStatsEntry } from './classes/ProfileColumnStatsEntry.js';
@@ -322,6 +328,7 @@ export { default as SlimOwner } from './classes/SlimOwner.js';
 export { default as SlimVideoMetadata } from './classes/SlimVideoMetadata.js';
 export { default as SortFilterSubMenu } from './classes/SortFilterSubMenu.js';
 export { default as StructuredDescriptionContent } from './classes/StructuredDescriptionContent.js';
+export { default as StructuredDescriptionPlaylistLockup } from './classes/StructuredDescriptionPlaylistLockup.js';
 export { default as SubFeedOption } from './classes/SubFeedOption.js';
 export { default as SubFeedSelector } from './classes/SubFeedSelector.js';
 export { default as SubscribeButton } from './classes/SubscribeButton.js';
@@ -349,22 +356,33 @@ export { default as ToggleButton } from './classes/ToggleButton.js';
 export { default as ToggleMenuServiceItem } from './classes/ToggleMenuServiceItem.js';
 export { default as Tooltip } from './classes/Tooltip.js';
 export { default as TopicChannelDetails } from './classes/TopicChannelDetails.js';
+export { default as Transcript } from './classes/Transcript.js';
+export { default as TranscriptFooter } from './classes/TranscriptFooter.js';
+export { default as TranscriptSearchBox } from './classes/TranscriptSearchBox.js';
+export { default as TranscriptSearchPanel } from './classes/TranscriptSearchPanel.js';
+export { default as TranscriptSectionHeader } from './classes/TranscriptSectionHeader.js';
+export { default as TranscriptSegment } from './classes/TranscriptSegment.js';
+export { default as TranscriptSegmentList } from './classes/TranscriptSegmentList.js';
 export { default as TwoColumnBrowseResults } from './classes/TwoColumnBrowseResults.js';
 export { default as TwoColumnSearchResults } from './classes/TwoColumnSearchResults.js';
 export { default as TwoColumnWatchNextResults } from './classes/TwoColumnWatchNextResults.js';
 export { default as UniversalWatchCard } from './classes/UniversalWatchCard.js';
+export { default as UploadTimeFactoid } from './classes/UploadTimeFactoid.js';
 export { default as UpsellDialog } from './classes/UpsellDialog.js';
 export { default as VerticalList } from './classes/VerticalList.js';
 export { default as VerticalWatchCardList } from './classes/VerticalWatchCardList.js';
 export { default as Video } from './classes/Video.js';
 export { default as VideoCard } from './classes/VideoCard.js';
+export { default as VideoDescriptionCourseSection } from './classes/VideoDescriptionCourseSection.js';
 export { default as VideoDescriptionHeader } from './classes/VideoDescriptionHeader.js';
 export { default as VideoDescriptionInfocardsSection } from './classes/VideoDescriptionInfocardsSection.js';
 export { default as VideoDescriptionMusicSection } from './classes/VideoDescriptionMusicSection.js';
+export { default as VideoDescriptionTranscriptSection } from './classes/VideoDescriptionTranscriptSection.js';
 export { default as VideoInfoCardContent } from './classes/VideoInfoCardContent.js';
 export { default as VideoOwner } from './classes/VideoOwner.js';
 export { default as VideoPrimaryInfo } from './classes/VideoPrimaryInfo.js';
 export { default as VideoSecondaryInfo } from './classes/VideoSecondaryInfo.js';
+export { default as ViewCountFactoid } from './classes/ViewCountFactoid.js';
 export { default as WatchCardCompactVideo } from './classes/WatchCardCompactVideo.js';
 export { default as WatchCardHeroVideo } from './classes/WatchCardHeroVideo.js';
 export { default as WatchCardRichHeader } from './classes/WatchCardRichHeader.js';

src/parser/parser.ts

@@ -7,6 +7,7 @@ import PlayerLiveStoryboardSpec from './classes/PlayerLiveStoryboardSpec.js';
 import PlayerStoryboardSpec from './classes/PlayerStoryboardSpec.js';
 import Alert from './classes/Alert.js';
 import AlertWithButton from './classes/AlertWithButton.js';
+import EngagementPanelSectionList from './classes/EngagementPanelSectionList.js';
 
 import type { IParsedResponse, IRawResponse, RawData, RawNode } from './types/index.js';
 
@@ -21,7 +22,13 @@ import { Memo, observe, SuperParsedResult } from './helpers.js';
 import * as YTNodes from './nodes.js';
 import type { KeyInfo } from './generator.js';
 import { camelToSnake, generateRuntimeClass, generateTypescriptClass } from './generator.js';
-import { Continuation, ItemSectionContinuation, SectionListContinuation, LiveChatContinuation, MusicPlaylistShelfContinuation, MusicShelfContinuation, GridContinuation, PlaylistPanelContinuation, NavigateAction, ShowMiniplayerCommand, ReloadContinuationItemsCommand } from './continuations.js';
+
+import {
+  Continuation, ItemSectionContinuation, SectionListContinuation,
+  LiveChatContinuation, MusicPlaylistShelfContinuation, MusicShelfContinuation,
+  GridContinuation, PlaylistPanelContinuation, NavigateAction, ShowMiniplayerCommand,
+  ReloadContinuationItemsCommand
+} from './continuations.js';
 
 export type ParserError = {
   classname: string,
@@ -289,6 +296,14 @@ export function parseResponse<T extends IParsedResponse = IParsedResponse>(data:
   }
   _clearMemo();
 
+  _createMemo();
+  const items = parse(data.items);
+  if (items) {
+    parsed_data.items = items;
+    parsed_data.items_memo = _getMemo();
+  }
+  _clearMemo();
+
   applyMutations(contents_memo, data.frameworkUpdates?.entityBatchUpdate?.mutations);
 
   const continuation = data.continuation ? parseC(data.continuation) : null;
@@ -352,15 +367,21 @@ export function parseResponse<T extends IParsedResponse = IParsedResponse>(data:
     parsed_data.playability_status = playability_status;
   }
 
-  const streaming_data = data.streamingData ? {
-    expires: new Date(Date.now() + parseInt(data.streamingData.expiresInSeconds) * 1000),
-    formats: parseFormats(data.streamingData.formats),
-    adaptive_formats: parseFormats(data.streamingData.adaptiveFormats),
-    dash_manifest_url: data.streamingData.dashManifestUrl || null,
-    hls_manifest_url: data.streamingData.hlsManifestUrl || null
-  } : undefined;
+  if (data.streamingData) {
+    // Currently each response with streaming data only has two n param values
+    // One for the adaptive formats and another for the combined formats
+    // As they are the same for a response, we only need to decipher them once
+    // For all futher deciphering calls on formats from that response, we can use the cached output, given the same input n param
+    const this_response_nsig_cache = new Map<string, string>();
+
+    const streaming_data = {
+      expires: new Date(Date.now() + parseInt(data.streamingData.expiresInSeconds) * 1000),
+      formats: parseFormats(data.streamingData.formats, this_response_nsig_cache),
+      adaptive_formats: parseFormats(data.streamingData.adaptiveFormats, this_response_nsig_cache),
+      dash_manifest_url: data.streamingData.dashManifestUrl || null,
+      hls_manifest_url: data.streamingData.hlsManifestUrl || null
+    };
 
-  if (streaming_data) {
     parsed_data.streaming_data = streaming_data;
   }
 
@@ -404,20 +425,10 @@ export function parseResponse<T extends IParsedResponse = IParsedResponse>(data:
     parsed_data.cards = cards;
   }
 
-  const engagement_panels = data.engagementPanels?.map((e) => {
-    const item = parseItem(e, YTNodes.EngagementPanelSectionList) as YTNodes.EngagementPanelSectionList;
-    return item;
-  });
-  if (engagement_panels) {
+  const engagement_panels = parseArray(data.engagementPanels, EngagementPanelSectionList);
+  if (engagement_panels.length) {
     parsed_data.engagement_panels = engagement_panels;
   }
-  _createMemo();
-  const items = parse(data.items);
-  if (items) {
-    parsed_data.items = items;
-    parsed_data.items_memo = _getMemo();
-  }
-  _clearMemo();
 
   return parsed_data;
 }
@@ -429,7 +440,7 @@ export function parseResponse<T extends IParsedResponse = IParsedResponse>(data:
  */
 export function parseItem<T extends YTNode, K extends YTNodeConstructor<T>[]>(data: RawNode | undefined, validTypes: K): InstanceType<K[number]> | null;
 export function parseItem<T extends YTNode>(data: RawNode | undefined, validTypes: YTNodeConstructor<T>): T | null;
-export function parseItem(data?: RawNode) : YTNode;
+export function parseItem(data?: RawNode): YTNode;
 export function parseItem(data?: RawNode, validTypes?: YTNodeConstructor | YTNodeConstructor[]) {
   if (!data) return null;
 
@@ -593,8 +604,8 @@ export function parseActions(data: RawData) {
   return new SuperParsedResult(parseItem(data));
 }
 
-export function parseFormats(formats: RawNode[]): Format[] {
-  return formats?.map((format) => new Format(format)) || [];
+export function parseFormats(formats: RawNode[], this_response_nsig_cache: Map<string, string>): Format[] {
+  return formats?.map((format) => new Format(format, this_response_nsig_cache)) || [];
 }
 
 export function applyMutations(memo: Memo, mutations: RawNode[]) {

src/parser/types/ParsedResponse.ts

@@ -20,6 +20,7 @@ import type NavigationEndpoint from '../classes/NavigationEndpoint.js';
 import type PlayerAnnotationsExpanded from '../classes/PlayerAnnotationsExpanded.js';
 import type EngagementPanelSectionList from '../classes/EngagementPanelSectionList.js';
 import type { AppendContinuationItemsAction } from '../nodes.js';
+
 export interface IParsedResponse {
   actions?: SuperParsedResult<YTNode>;
   actions_memo?: Memo;
@@ -63,7 +64,7 @@ export interface IParsedResponse {
   storyboards?: PlayerStoryboardSpec | PlayerLiveStoryboardSpec;
   endscreen?: Endscreen;
   cards?: CardCollection;
-  engagement_panels?: EngagementPanelSectionList[];
+  engagement_panels?: ObservedArray<EngagementPanelSectionList>;
   items?: SuperParsedResult<YTNode>;
 }
 
@@ -106,7 +107,7 @@ export interface INextResponse {
   on_response_received_endpoints?: ObservedArray<ReloadContinuationItemsCommand | AppendContinuationItemsAction>;
   on_response_received_endpoints_memo?: Memo;
   player_overlays?: SuperParsedResult<YTNode>;
-  engagement_panels?: EngagementPanelSectionList[];
+  engagement_panels?: ObservedArray<EngagementPanelSectionList>;
 }
 
 export interface IBrowseResponse {
@@ -145,6 +146,11 @@ export interface IResolveURLResponse {
   endpoint: NavigationEndpoint;
 }
 
+export interface IGetTranscriptResponse {
+  actions: SuperParsedResult<YTNode>;
+  actions_memo: Memo;
+}
+
 export interface IGetNotificationsMenuResponse {
   actions: SuperParsedResult<YTNode>;
   actions_memo: Memo;

src/parser/youtube/Playlist.ts

@@ -9,6 +9,7 @@ import PlaylistSidebarPrimaryInfo from '../classes/PlaylistSidebarPrimaryInfo.js
 import PlaylistSidebarSecondaryInfo from '../classes/PlaylistSidebarSecondaryInfo.js';
 import PlaylistVideoThumbnail from '../classes/PlaylistVideoThumbnail.js';
 import VideoOwner from '../classes/VideoOwner.js';
+import Alert from '../classes/Alert.js';
 
 import { InnertubeError } from '../../utils/Utils.js';
 import type { ObservedArray } from '../helpers.js';
@@ -17,7 +18,7 @@ import type Actions from '../../core/Actions.js';
 import type { ApiResponse } from '../../core/Actions.js';
 import type { IBrowseResponse } from '../types/ParsedResponse.js';
 
-class Playlist extends Feed<IBrowseResponse> {
+export default class Playlist extends Feed<IBrowseResponse> {
   info;
   menu;
   endpoint?: NavigationEndpoint;
@@ -29,9 +30,13 @@ class Playlist extends Feed<IBrowseResponse> {
     const header = this.memo.getType(PlaylistHeader).first();
     const primary_info = this.memo.getType(PlaylistSidebarPrimaryInfo).first();
     const secondary_info = this.memo.getType(PlaylistSidebarSecondaryInfo).first();
+    const alert = this.page.alerts?.firstOfType(Alert);
 
-    if (!primary_info && !secondary_info)
-      throw new InnertubeError('This playlist does not exist');
+    if (alert && alert.alert_type === 'ERROR')
+      throw new InnertubeError(alert.text.toString(), alert);
+
+    if (!primary_info && !secondary_info && Object.keys(this.page).length === 0)
+      throw new InnertubeError('Got empty continuation response. This is likely the end of the playlist.');
 
     this.info = {
       ...this.page.metadata?.item().as(PlaylistMetadata),
@@ -69,6 +74,4 @@ class Playlist extends Feed<IBrowseResponse> {
       throw new InnertubeError('Could not get continuation data');
     return new Playlist(this.actions, page, true);
   }
-}
-
-export default Playlist;
+}

src/parser/youtube/TranscriptInfo.ts

@@ -0,0 +1,55 @@
+import type Actions from '../../core/Actions.js';
+import { type ApiResponse } from '../../core/Actions.js';
+import type { IGetTranscriptResponse } from '../index.js';
+import Parser from '../index.js';
+import Transcript from '../classes/Transcript.js';
+
+export default class TranscriptInfo {
+  #page: IGetTranscriptResponse;
+  #actions: Actions;
+  transcript: Transcript;
+
+  constructor(actions: Actions, response: ApiResponse) {
+    this.#page = Parser.parseResponse(response.data);
+    this.#actions = actions;
+    this.transcript = this.#page.actions_memo.getType(Transcript).first();
+  }
+
+  /**
+   * Selects a language from the language menu and returns the updated transcript.
+   * @param language - Language to select.
+   */
+  async selectLanguage(language: string): Promise<TranscriptInfo> {
+    const target_menu_item = this.transcript.content?.footer?.language_menu?.sub_menu_items?.find((item) => item.title.toString() === language);
+
+    if (!target_menu_item)
+      throw new Error(`Language not found: ${language}`);
+
+    if (target_menu_item.selected)
+      return this;
+
+    const response = await this.#actions.execute('/get_transcript', {
+      params: target_menu_item.continuation
+    });
+
+    return new TranscriptInfo(this.#actions, response);
+  }
+
+  /**
+   * Returns available languages.
+   */
+  get languages(): string[] {
+    return this.transcript.content?.footer?.language_menu?.sub_menu_items?.map((item) => item.title.toString()) || [];
+  }
+
+  /**
+   * Returns the currently selected language.
+   */
+  get selectedLanguage(): string {
+    return this.transcript.content?.footer?.language_menu?.sub_menu_items?.find((item) => item.selected)?.title.toString() || '';
+  }
+
+  get page() {
+    return this.#page;
+  }
+}

src/types/Endpoints.ts

@@ -334,18 +334,22 @@ export type EditPlaylistEndpointOptions = {
    * The changes to make to the playlist.
    */
   actions: {
-    action: 'ACTION_ADD_VIDEO' | 'ACTION_REMOVE_VIDEO' | 'ACTION_MOVE_VIDEO_AFTER';
+    action: 'ACTION_ADD_VIDEO' | 'ACTION_REMOVE_VIDEO' | 'ACTION_MOVE_VIDEO_AFTER' | 'ACTION_SET_PLAYLIST_DESCRIPTION' | 'ACTION_SET_PLAYLIST_NAME';
     added_video_id?: string;
     set_video_id?: string;
     moved_set_video_id_predecessor?: string;
+    playlist_description?: string;
+    playlist_name?: string;
   }[];
 }
 
 export interface IEditPlaylistRequest extends ObjectSnakeToCamel<EditPlaylistEndpointOptions> {
   actions: {
-    action: 'ACTION_ADD_VIDEO' | 'ACTION_REMOVE_VIDEO' | 'ACTION_MOVE_VIDEO_AFTER';
+    action: 'ACTION_ADD_VIDEO' | 'ACTION_REMOVE_VIDEO' | 'ACTION_MOVE_VIDEO_AFTER' | 'ACTION_SET_PLAYLIST_DESCRIPTION' | 'ACTION_SET_PLAYLIST_NAME';
     addedVideoId?: string;
     setVideoId?: string;
     movedSetVideoIdPredecessor?: string;
+    playlistDescription?: string;
+    playlistName?: string;
   }[];
 }