parser.ts

import AudioOnlyPlayability from './classes/AudioOnlyPlayability.js';
import CardCollection from './classes/CardCollection.js';
import Endscreen from './classes/Endscreen.js';
import PlayerAnnotationsExpanded from './classes/PlayerAnnotationsExpanded.js';
import PlayerCaptionsTracklist from './classes/PlayerCaptionsTracklist.js';
import PlayerLiveStoryboardSpec from './classes/PlayerLiveStoryboardSpec.js';
import PlayerStoryboardSpec from './classes/PlayerStoryboardSpec.js';
import Message from './classes/Message.js';
import LiveChatParticipantsList from './classes/LiveChatParticipantsList.js';
import LiveChatHeader from './classes/LiveChatHeader.js';
import LiveChatItemList from './classes/LiveChatItemList.js';
import Alert from './classes/Alert.js';

import type { IParsedResponse, IRawResponse, RawData, RawNode } from './types/index.js';

import MusicMultiSelectMenuItem from './classes/menus/MusicMultiSelectMenuItem.js';
import Format from './classes/misc/Format.js';
import VideoDetails from './classes/misc/VideoDetails.js';
import NavigationEndpoint from './classes/NavigationEndpoint.js';
import Thumbnail from './classes/misc/Thumbnail.js';

import { InnertubeError, ParsingError, Platform } from '../utils/Utils.js';
import { Memo, observe, ObservedArray, SuperParsedResult, YTNode, YTNodeConstructor } from './helpers.js';
import * as YTNodes from './nodes.js';
import { YTNodeGenerator } from './generator.js';

export type ParserError = { classname: string, classdata: any, err: any };
export type ParserErrorHandler = (error: ParserError) => void;

export default class Parser {
  static #errorHandler: ParserErrorHandler = Parser.#printError;
  static #memo: Memo | null = null;

  static setParserErrorHandler(handler: ParserErrorHandler) {
    this.#errorHandler = handler;
  }

  static #clearMemo() {
    Parser.#memo = null;
  }

  static #createMemo() {
    Parser.#memo = new Memo();
  }

  static #addToMemo(classname: string, result: YTNode) {
    if (!Parser.#memo)
      return;

    const list = Parser.#memo.get(classname);
    if (!list)
      return Parser.#memo.set(classname, [ result ]);

    list.push(result);
  }

  static #getMemo() {
    if (!Parser.#memo)
      throw new Error('Parser#getMemo() called before Parser#createMemo()');
    return Parser.#memo;
  }

  /**
   * Parses given InnerTube response.
   * @param data - Raw data.
   */
  static parseResponse<T extends IParsedResponse = IParsedResponse>(data: IRawResponse): T {
    const parsed_data = {} as T;

    this.#createMemo();
    const contents = this.parse(data.contents);
    const contents_memo = this.#getMemo();
    if (contents) {
      parsed_data.contents = contents;
      parsed_data.contents_memo = contents_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const on_response_received_actions = data.onResponseReceivedActions ? this.parseRR(data.onResponseReceivedActions) : null;
    const on_response_received_actions_memo = this.#getMemo();
    if (on_response_received_actions) {
      parsed_data.on_response_received_actions = on_response_received_actions;
      parsed_data.on_response_received_actions_memo = on_response_received_actions_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const on_response_received_endpoints = data.onResponseReceivedEndpoints ? this.parseRR(data.onResponseReceivedEndpoints) : null;
    const on_response_received_endpoints_memo = this.#getMemo();
    if (on_response_received_endpoints) {
      parsed_data.on_response_received_endpoints = on_response_received_endpoints;
      parsed_data.on_response_received_endpoints_memo = on_response_received_endpoints_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const on_response_received_commands = data.onResponseReceivedCommands ? this.parseRR(data.onResponseReceivedCommands) : null;
    const on_response_received_commands_memo = this.#getMemo();
    if (on_response_received_commands) {
      parsed_data.on_response_received_commands = on_response_received_commands;
      parsed_data.on_response_received_commands_memo = on_response_received_commands_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const continuation_contents = data.continuationContents ? this.parseLC(data.continuationContents) : null;
    const continuation_contents_memo = this.#getMemo();
    if (continuation_contents) {
      parsed_data.continuation_contents = continuation_contents;
      parsed_data.continuation_contents_memo = continuation_contents_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const actions = data.actions ? this.parseActions(data.actions) : null;
    const actions_memo = this.#getMemo();
    if (actions) {
      parsed_data.actions = actions;
      parsed_data.actions_memo = actions_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const live_chat_item_context_menu_supported_renderers = data.liveChatItemContextMenuSupportedRenderers ? this.parseItem(data.liveChatItemContextMenuSupportedRenderers) : null;
    const live_chat_item_context_menu_supported_renderers_memo = this.#getMemo();
    if (live_chat_item_context_menu_supported_renderers) {
      parsed_data.live_chat_item_context_menu_supported_renderers = live_chat_item_context_menu_supported_renderers;
      parsed_data.live_chat_item_context_menu_supported_renderers_memo = live_chat_item_context_menu_supported_renderers_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const header = data.header ? this.parse(data.header) : null;
    const header_memo = this.#getMemo();
    if (header) {
      parsed_data.header = header;
      parsed_data.header_memo = header_memo;
    }
    this.#clearMemo();

    this.#createMemo();
    const sidebar = data.sidebar ? this.parseItem(data.sidebar) : null;
    const sidebar_memo = this.#getMemo();
    if (sidebar) {
      parsed_data.sidebar = sidebar;
      parsed_data.sidebar_memo = sidebar_memo;
    }
    this.#clearMemo();

    this.applyMutations(contents_memo, data.frameworkUpdates?.entityBatchUpdate?.mutations);

    const continuation = data.continuation ? this.parseC(data.continuation) : null;
    if (continuation) {
      parsed_data.continuation = continuation;
    }

    const metadata = this.parse(data.metadata);
    if (metadata) {
      parsed_data.metadata = metadata;
    }

    const microformat = this.parseItem(data.microformat);
    if (microformat) {
      parsed_data.microformat = microformat;
    }

    const overlay = this.parseItem(data.overlay);
    if (overlay) {
      parsed_data.overlay = overlay;
    }

    const alerts = this.parseArray(data.alerts, Alert);
    if (alerts.length) {
      parsed_data.alerts = alerts;
    }

    const refinements = data.refinements;
    if (refinements) {
      parsed_data.refinements = refinements;
    }

    const estimated_results = data.estimatedResults ? parseInt(data.estimatedResults) : null;
    if (estimated_results) {
      parsed_data.estimated_results = estimated_results;
    }

    const player_overlays = this.parse(data.playerOverlays);
    if (player_overlays) {
      parsed_data.player_overlays = player_overlays;
    }

    const playback_tracking = data.playbackTracking ? {
      videostats_watchtime_url: data.playbackTracking.videostatsWatchtimeUrl.baseUrl,
      videostats_playback_url: data.playbackTracking.videostatsPlaybackUrl.baseUrl
    } : null;

    if (playback_tracking) {
      parsed_data.playback_tracking = playback_tracking;
    }

    const playability_status = data.playabilityStatus ? {
      status: data.playabilityStatus.status,
      reason: data.playabilityStatus.reason || '',
      embeddable: !!data.playabilityStatus.playableInEmbed || false,
      audio_only_playablility: this.parseItem(data.playabilityStatus.audioOnlyPlayability, AudioOnlyPlayability),
      error_screen: this.parseItem(data.playabilityStatus.errorScreen)
    } : null;

    if (playability_status) {
      parsed_data.playability_status = playability_status;
    }

    const streaming_data = data.streamingData ? {
      expires: new Date(Date.now() + parseInt(data.streamingData.expiresInSeconds) * 1000),
      formats: Parser.parseFormats(data.streamingData.formats),
      adaptive_formats: Parser.parseFormats(data.streamingData.adaptiveFormats),
      dash_manifest_url: data.streamingData.dashManifestUrl || null,
      hls_manifest_url: data.streamingData.hlsManifestUrl || null
    } : undefined;

    if (streaming_data) {
      parsed_data.streaming_data = streaming_data;
    }

    const current_video_endpoint = data.currentVideoEndpoint ? new NavigationEndpoint(data.currentVideoEndpoint) : null;
    if (current_video_endpoint) {
      parsed_data.current_video_endpoint = current_video_endpoint;
    }

    const endpoint = data.endpoint ? new NavigationEndpoint(data.endpoint) : null;
    if (endpoint) {
      parsed_data.endpoint = endpoint;
    }

    const captions = this.parseItem(data.captions, PlayerCaptionsTracklist);
    if (captions) {
      parsed_data.captions = captions;
    }

    const video_details = data.videoDetails ? new VideoDetails(data.videoDetails) : null;
    if (video_details) {
      parsed_data.video_details = video_details;
    }

    const annotations = this.parseArray(data.annotations, PlayerAnnotationsExpanded);
    if (annotations.length) {
      parsed_data.annotations = annotations;
    }

    const storyboards = this.parseItem(data.storyboards, [ PlayerStoryboardSpec, PlayerLiveStoryboardSpec ]);
    if (storyboards) {
      parsed_data.storyboards = storyboards;
    }

    const endscreen = this.parseItem(data.endscreen, Endscreen);
    if (endscreen) {
      parsed_data.endscreen = endscreen;
    }

    const cards = this.parseItem(data.cards, CardCollection);
    if (cards) {
      parsed_data.cards = cards;
    }

    this.#createMemo();
    const items = this.parse(data.items);
    if (items) {
      parsed_data.items = items;
      parsed_data.items_memo = this.#getMemo();
    }
    this.#clearMemo();

    return parsed_data;
  }

  /**
   * Parses a single item.
   * @param data - The data to parse.
   * @param validTypes - YTNode types that are allowed to be parsed.
   */
  static parseItem<T extends YTNode, K extends YTNodeConstructor<T>[]>(data: RawNode | undefined, validTypes: K): InstanceType<K[number]> | null;
  static parseItem<T extends YTNode>(data: RawNode | undefined, validTypes: YTNodeConstructor<T>): T | null;
  static parseItem(data?: RawNode) : YTNode;
  static parseItem(data?: RawNode, validTypes?: YTNodeConstructor | YTNodeConstructor[]) {
    if (!data) return null;

    const keys = Object.keys(data);

    if (!keys.length)
      return null;

    const classname = this.sanitizeClassName(keys[0]);

    if (!this.shouldIgnore(classname)) {
      try {
        const has_target_class = this.hasParser(classname);

        const TargetClass = has_target_class ? this.getParserByName(classname) : YTNodeGenerator.generateRuntimeClass(classname, data[keys[0]]);

        if (validTypes) {
          if (Array.isArray(validTypes)) {
            if (!validTypes.some((type) => type.type === TargetClass.type))
              throw new ParsingError(`Type mismatch, got ${classname} but expected one of ${validTypes.map((type) => type.type).join(', ')}`);
          } else if (TargetClass.type !== validTypes.type)
            throw new ParsingError(`Type mismatch, got ${classname} but expected ${validTypes.type}`);
        }

        const result = new TargetClass(data[keys[0]]);
        this.#addToMemo(classname, result);

        return result;
      } catch (err) {
        this.#errorHandler({ classname, classdata: data[keys[0]], err });
        return null;
      }
    }

    return null;
  }

  extra() {
    Parser.parseItem({}, [ MusicMultiSelectMenuItem, MusicMultiSelectMenuItem ]);
  }

  /**
   * Parses an array of items.
   * @param data - The data to parse.
   * @param validTypes - YTNode types that are allowed to be parsed.
   */
  static parseArray<T extends YTNode, K extends YTNodeConstructor<T>[]>(data: RawNode[] | undefined, validTypes: K): ObservedArray<InstanceType<K[number]>>;
  static parseArray<T extends YTNode = YTNode>(data: RawNode[] | undefined, validType: YTNodeConstructor<T>): ObservedArray<T>;
  static parseArray(data: RawNode[] | undefined): ObservedArray<YTNode>;
  static parseArray(data?: RawNode[], validTypes?: YTNodeConstructor | YTNodeConstructor[]) {
    if (Array.isArray(data)) {
      const results: YTNode[] = [];

      for (const item of data) {
        const result = this.parseItem(item, validTypes as YTNodeConstructor);
        if (result) {
          results.push(result);
        }
      }

      return observe(results);
    } else if (!data) {
      return observe([] as YTNode[]);
    }
    throw new ParsingError('Expected array but got a single item');
  }

  /**
   * Parses an item or an array of items.
   * @param data - The data to parse.
   * @param requireArray - Whether the data should be parsed as an array.
   * @param validTypes - YTNode types that are allowed to be parsed.
   */
  static parse<T extends YTNode, K extends YTNodeConstructor<T>[]>(data: RawData, requireArray: true, validTypes?: K): ObservedArray<InstanceType<K[number]>> | null;
  static parse<T extends YTNode = YTNode>(data?: RawData, requireArray?: false | undefined, validTypes?: YTNodeConstructor<T> | YTNodeConstructor<T>[]): SuperParsedResult<T>;
  static parse<T extends YTNode = YTNode>(data?: RawData, requireArray?: boolean, validTypes?: YTNodeConstructor<T> | YTNodeConstructor<T>[]) {
    if (!data) return null;

    if (Array.isArray(data)) {
      const results: T[] = [];

      for (const item of data) {
        const result = this.parseItem(item, validTypes as YTNodeConstructor<T>);
        if (result) {
          results.push(result);
        }
      }

      const res = observe(results);

      return requireArray ? res : new SuperParsedResult(observe(results));
    } else if (requireArray) {
      throw new ParsingError('Expected array but got a single item');
    }

    return new SuperParsedResult(this.parseItem(data, validTypes as YTNodeConstructor<T>));
  }

  static parseC(data: RawNode) {
    if (data.timedContinuationData)
      return new Continuation({ continuation: data.timedContinuationData, type: 'timed' });
    return null;
  }

  static parseLC(data: RawNode) {
    if (data.itemSectionContinuation)
      return new ItemSectionContinuation(data.itemSectionContinuation);
    if (data.sectionListContinuation)
      return new SectionListContinuation(data.sectionListContinuation);
    if (data.liveChatContinuation)
      return new LiveChatContinuation(data.liveChatContinuation);
    if (data.musicPlaylistShelfContinuation)
      return new MusicPlaylistShelfContinuation(data.musicPlaylistShelfContinuation);
    if (data.musicShelfContinuation)
      return new MusicShelfContinuation(data.musicShelfContinuation);
    if (data.gridContinuation)
      return new GridContinuation(data.gridContinuation);
    if (data.playlistPanelContinuation)
      return new PlaylistPanelContinuation(data.playlistPanelContinuation);

    return null;
  }

  static parseRR(actions: RawNode[]) {
    return observe(actions.map((action: any) => {
      if (action.navigateAction)
        return new NavigateAction(action.navigateAction);
      if (action.reloadContinuationItemsCommand)
        return new ReloadContinuationItemsCommand(action.reloadContinuationItemsCommand);
      if (action.appendContinuationItemsAction)
        return new AppendContinuationItemsAction(action.appendContinuationItemsAction);
    }).filter((item) => item) as (ReloadContinuationItemsCommand | AppendContinuationItemsAction)[]);
  }

  static parseActions(data: RawData) {
    if (Array.isArray(data)) {
      return Parser.parse(data.map((action) => {
        delete action.clickTrackingParams;
        return action;
      }));
    }
    return new SuperParsedResult(this.parseItem(data));
  }

  static parseFormats(formats: RawNode[]): Format[] {
    return formats?.map((format) => new Format(format)) || [];
  }

  static applyMutations(memo: Memo, mutations: RawNode[]) {
    // Apply mutations to MusicMultiSelectMenuItems
    const music_multi_select_menu_items = memo.getType(MusicMultiSelectMenuItem);

    if (music_multi_select_menu_items.length > 0 && !mutations) {
      console.warn(
        new InnertubeError(
          'Mutation data required for processing MusicMultiSelectMenuItems, but none found.\n' +
          `This is a bug, please report it at ${Platform.shim.info.bugs_url}`
        )
      );
    } else {
      const missing_or_invalid_mutations = [];

      for (const menu_item of music_multi_select_menu_items) {
        const mutation = mutations
          .find((mutation) => mutation.payload?.musicFormBooleanChoice?.id === menu_item.form_item_entity_key);

        const choice = mutation?.payload.musicFormBooleanChoice;

        if (choice?.selected !== undefined && choice?.opaqueToken) {
          menu_item.selected = choice.selected;
        } else {
          missing_or_invalid_mutations.push(`'${menu_item.title}'`);
        }
      }
      if (missing_or_invalid_mutations.length > 0) {
        console.warn(
          new InnertubeError(
            `Mutation data missing or invalid for ${missing_or_invalid_mutations.length} out of ${music_multi_select_menu_items.length} MusicMultiSelectMenuItems. ` +
            `The titles of the failed items are: ${missing_or_invalid_mutations.join(', ')}.\n` +
            `This is a bug, please report it at ${Platform.shim.info.bugs_url}`
          )
        );
      }
    }
  }

  static #printError({ classname, classdata, err }: ParserError) {
    if (err.code == 'MODULE_NOT_FOUND') {
      return console.warn(
        new InnertubeError(
          `${classname} not found!\n` +
          `This is a bug, want to help us fix it? Follow the instructions at ${Platform.shim.info.repo_url.split('#')[0]}/blob/main/docs/updating-the-parser.md or report it at ${Platform.shim.info.bugs_url}!`, classdata
        )
      );
    }

    console.warn(
      new InnertubeError(
        `Something went wrong at ${classname}!\n` +
        `This is a bug, please report it at ${Platform.shim.info.bugs_url}`, { stack: err.stack }
      )
    );
  }

  static sanitizeClassName(input: string) {
    return (input.charAt(0).toUpperCase() + input.slice(1))
      .replace(/Renderer|Model/g, '')
      .replace(/Radio/g, 'Mix').trim();
  }

  static ignore_list = new Set<string>([
    'AdSlot',
    'DisplayAd',
    'SearchPyv',
    'MealbarPromo',
    'BackgroundPromo',
    'PromotedSparklesWeb',
    'RunAttestationCommand',
    'CompactPromotedVideo',
    'StatementBanner',
    'GuideSigninPromo'
  ]);

  static shouldIgnore(classname: string) {
    return this.ignore_list.has(classname);
  }

  static #rt_nodes = new Map<string, YTNodeConstructor>(Array.from(Object.entries(YTNodes)));
  static #dynamic_nodes = new Map<string, YTNodeConstructor>();

  static getParserByName(classname: string) {
    const ParserConstructor = this.#rt_nodes.get(classname);

    if (!ParserConstructor) {
      const error = new Error(`Module not found: ${classname}`);
      (error as any).code = 'MODULE_NOT_FOUND';
      throw error;
    }

    return ParserConstructor;
  }

  static hasParser(classname: string) {
    return this.#rt_nodes.has(classname);
  }

  static addRuntimeParser(classname: string, ParserConstructor: YTNodeConstructor) {
    this.#rt_nodes.set(classname, ParserConstructor);
    this.#dynamic_nodes.set(classname, ParserConstructor);
  }

  static getDynamicParsers() {
    return Object.fromEntries(this.#dynamic_nodes);
  }
}

// Continuation

export class ItemSectionContinuation extends YTNode {
  static readonly type = 'itemSectionContinuation';

  contents: ObservedArray<YTNode> | null;
  continuation?: string;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parseArray(data.contents);
    if (Array.isArray(data.continuations)) {
      this.continuation = data.continuations?.at(0)?.nextContinuationData?.continuation;
    }
  }
}

export class NavigateAction extends YTNode {
  static readonly type = 'navigateAction';

  endpoint: NavigationEndpoint;

  constructor(data: RawNode) {
    super();
    this.endpoint = new NavigationEndpoint(data.endpoint);
  }
}

export class AppendContinuationItemsAction extends YTNode {
  static readonly type = 'appendContinuationItemsAction';

  contents: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parse(data.continuationItems, true);
  }
}

export class ReloadContinuationItemsCommand extends YTNode {
  static readonly type = 'reloadContinuationItemsCommand';

  target_id: string;
  contents: ObservedArray<YTNode> | null;
  slot?: string;

  constructor(data: RawNode) {
    super();
    this.target_id = data.targetId;
    this.contents = Parser.parse(data.continuationItems, true);
    this.slot = data?.slot;
  }
}

export class SectionListContinuation extends YTNode {
  static readonly type = 'sectionListContinuation';

  continuation: string;
  contents: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parse(data.contents, true);
    this.continuation =
      data.continuations?.[0]?.nextContinuationData?.continuation ||
      data.continuations?.[0]?.reloadContinuationData?.continuation || null;
  }
}

export class MusicPlaylistShelfContinuation extends YTNode {
  static readonly type = 'musicPlaylistShelfContinuation';

  continuation: string;
  contents: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parse(data.contents, true);
    this.continuation = data.continuations?.[0].nextContinuationData.continuation || null;
  }
}

export class MusicShelfContinuation extends YTNode {
  static readonly type = 'musicShelfContinuation';

  continuation: string;
  contents: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parseArray(data.contents);
    this.continuation =
      data.continuations?.[0].nextContinuationData?.continuation ||
      data.continuations?.[0].reloadContinuationData?.continuation || null;
  }
}

export class GridContinuation extends YTNode {
  static readonly type = 'gridContinuation';

  continuation: string;
  items: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.items = Parser.parse(data.items, true);
    this.continuation = data.continuations?.[0].nextContinuationData.continuation || null;
  }

  get contents() {
    return this.items;
  }
}

export class PlaylistPanelContinuation extends YTNode {
  static readonly type = 'playlistPanelContinuation';

  continuation: string;
  contents: ObservedArray<YTNode> | null;

  constructor(data: RawNode) {
    super();
    this.contents = Parser.parseArray(data.contents);
    this.continuation = data.continuations?.[0]?.nextContinuationData?.continuation ||
      data.continuations?.[0]?.nextRadioContinuationData?.continuation || null;
  }
}

export class Continuation extends YTNode {
  static readonly type = 'continuation';

  continuation_type: string;
  timeout_ms?: number;
  time_until_last_message_ms?: number;
  token: string;

  constructor(data: RawNode) {
    super();
    this.continuation_type = data.type;
    this.timeout_ms = data.continuation?.timeoutMs;
    this.time_until_last_message_ms = data.continuation?.timeUntilLastMessageMsec;
    this.token = data.continuation?.continuation;
  }
}

export class LiveChatContinuation extends YTNode {
  static readonly type = 'liveChatContinuation';

  actions: ObservedArray<YTNode>;
  action_panel: YTNode | null;
  item_list: LiveChatItemList | null;
  header: LiveChatHeader | null;
  participants_list: LiveChatParticipantsList | null;
  popout_message: Message | null;
  emojis: {
    emoji_id: string;
    shortcuts: string[];
    search_terms: string[];
    image: Thumbnail[];
  }[];
  continuation: Continuation;
  viewer_name: string;

  constructor(data: RawNode) {
    super();
    this.actions = Parser.parse(data.actions?.map((action: any) => {
      delete action.clickTrackingParams;
      return action;
    }), true) || observe<YTNode>([]);

    this.action_panel = Parser.parseItem(data.actionPanel);
    this.item_list = Parser.parseItem(data.itemList, LiveChatItemList);
    this.header = Parser.parseItem(data.header, LiveChatHeader);
    this.participants_list = Parser.parseItem(data.participantsList, LiveChatParticipantsList);
    this.popout_message = Parser.parseItem(data.popoutMessage, Message);

    this.emojis = data.emojis?.map((emoji: any) => ({
      emoji_id: emoji.emojiId,
      shortcuts: emoji.shortcuts,
      search_terms: emoji.searchTerms,
      image: Thumbnail.fromResponse(emoji.image),
      is_custom_emoji: emoji.isCustomEmoji
    })) || [];

    let continuation, type;

    if (data.continuations?.[0].timedContinuationData) {
      type = 'timed';
      continuation = data.continuations?.[0].timedContinuationData;
    } else if (data.continuations?.[0].invalidationContinuationData) {
      type = 'invalidation';
      continuation = data.continuations?.[0].invalidationContinuationData;
    } else if (data.continuations?.[0].liveChatReplayContinuationData) {
      type = 'replay';
      continuation = data.continuations?.[0].liveChatReplayContinuationData;
    }

    this.continuation = new Continuation({ continuation, type });

    this.viewer_name = data.viewerName;
  }
}