♻️ Strict Typescript

src/clients/discord/discord.config.service.ts

@@ -9,7 +9,7 @@ import { GatewayIntentBits } from 'discord.js';
 export class DiscordConfigService implements DiscordOptionsFactory {
   createDiscordOptions(): DiscordModuleOption {
     return {
-      token: process.env.DISCORD_CLIENT_TOKEN,
+      token: process.env.DISCORD_CLIENT_TOKEN ?? '',
       discordClientOptions: {
         intents: [
           GatewayIntentBits.Guilds,

src/clients/discord/discord.voice.service.ts

@@ -104,6 +104,10 @@ export class DiscordVoiceService {
   }
 
   changeVolume(volume: number) {
+    if (!this.audioResource || !this.audioResource.volume) {
+      this.logger.error(`AudioResource or volume was undefined`);
+      return;
+    }
     this.audioResource.volume.setVolume(volume);
   }
 
@@ -236,6 +240,20 @@ export class DiscordVoiceService {
   }
 
   private attachEventListenersToAudioPlayer() {
+    if (!this.voiceConnection) {
+      this.logger.error(
+        `Unable to attach listener events, because the VoiceConnection was undefined`,
+      );
+      return;
+    }
+
+    if (!this.audioPlayer) {
+      this.logger.error(
+        `Unable to attach listener events, because the AudioPlayer was undefined`,
+      );
+      return;
+    }
+
     this.voiceConnection.on('debug', (message) => {
       if (process.env.DEBUG?.toLowerCase() !== 'true') {
         return;
@@ -253,6 +271,13 @@ export class DiscordVoiceService {
       this.logger.error(message);
     });
     this.audioPlayer.on('stateChange', (previousState) => {
+      if (!this.audioPlayer) {
+        this.logger.error(
+          `Unable to process state change from audio player, because the current audio player in the callback was undefined`,
+        );
+        return;
+      }
+
       this.logger.debug(
         `Audio player changed state from ${previousState.status} to ${this.audioPlayer.state.status}`,
       );
@@ -269,9 +294,11 @@ export class DiscordVoiceService {
 
       const playlist = this.playbackService.getPlaylistOrDefault();
       const finishedTrack = playlist.getActiveTrack();
-      finishedTrack.playing = false;
 
-      this.eventEmitter.emit('internal.audio.track.finish', finishedTrack);
+      if (finishedTrack) {
+        finishedTrack.playing = false;
+        this.eventEmitter.emit('internal.audio.track.finish', finishedTrack);
+      }
 
       const hasNextTrack = playlist.hasNextTrackInPlaylist();
 

src/clients/jellyfin/jellyfin.search.service.ts

@@ -1,4 +1,5 @@
 import {
+  BaseItemDto,
   BaseItemKind,
   RemoteImageResult,
   SearchHint as JellyfinSearchHint,
@@ -57,9 +58,13 @@ export class JellyfinSearchService {
 
       const { SearchHints } = data;
 
-      return SearchHints.map((hint) => this.transformToSearchHint(hint)).filter(
-        (x) => x !== null,
-      );
+      if (!SearchHints) {
+        throw new Error('SearchHints were undefined');
+      }
+
+      return SearchHints.map((hint) =>
+        this.transformToSearchHintFromHint(hint),
+      ).filter((x) => x !== null) as SearchHint[];
     } catch (err) {
       this.logger.error(`Failed to search on Jellyfin: ${err}`);
       return [];
@@ -82,8 +87,15 @@ export class JellyfinSearchService {
       return [];
     }
 
+    if (!axiosResponse.data.Items) {
+      this.logger.error(
+        `Jellyfin search returned no items: ${axiosResponse.data}`,
+      );
+      return [];
+    }
+
     return axiosResponse.data.Items.map((hint) =>
-      SearchHint.constructFromHint(hint),
+      SearchHint.constructFromBaseItem(hint),
     );
   }
 
@@ -104,6 +116,13 @@ export class JellyfinSearchService {
       return [];
     }
 
+    if (!axiosResponse.data.SearchHints) {
+      this.logger.error(
+        `Received an unexpected empty list but expected a list of tracks of the album`,
+      );
+      return [];
+    }
+
     return [...axiosResponse.data.SearchHints]
       .reverse()
       .map((hint) => SearchHint.constructFromHint(hint));
@@ -112,7 +131,7 @@ export class JellyfinSearchService {
   async getById(
     id: string,
     includeItemTypes: BaseItemKind[],
-  ): Promise<SearchHint> | undefined {
+  ): Promise<SearchHint | undefined> {
     const api = this.jellyfinService.getApi();
 
     const searchApi = getItemsApi(api);
@@ -122,18 +141,18 @@ export class JellyfinSearchService {
       includeItemTypes: includeItemTypes,
     });
 
-    if (data.Items.length !== 1) {
+    if (!data.Items || data.Items.length !== 1) {
       this.logger.warn(`Failed to retrieve item via id '${id}'`);
-      return null;
+      return undefined;
     }
 
-    return this.transformToSearchHint(data.Items[0]);
+    return this.transformToSearchHintFromBaseItemDto(data.Items[0]);
   }
 
   async getAllById(
     ids: string[],
     includeItemTypes: BaseItemKind[] = [BaseItemKind.Audio],
-  ): Promise<SearchHint[]> | undefined {
+  ): Promise<SearchHint[]> {
     const api = this.jellyfinService.getApi();
 
     const searchApi = getItemsApi(api);
@@ -143,12 +162,14 @@ export class JellyfinSearchService {
       includeItemTypes: includeItemTypes,
     });
 
-    if (data.Items.length !== 1) {
+    if (!data.Items || data.Items.length !== 1) {
       this.logger.warn(`Failed to retrieve item via id '${ids}'`);
-      return null;
+      return [];
     }
 
-    return data.Items.map((item) => this.transformToSearchHint(item));
+    return data.Items.map((item) =>
+      this.transformToSearchHintFromBaseItemDto(item),
+    ).filter((searchHint) => searchHint !== undefined) as SearchHint[];
   }
 
   async getRemoteImageById(id: string, limit = 20): Promise<RemoteImageResult> {
@@ -204,18 +225,25 @@ export class JellyfinSearchService {
         recursive: true,
       });
 
+      if (!response.data.Items) {
+        this.logger.error(
+          `Received empty list of items but expected a random list of tracks`,
+        );
+        return [];
+      }
+
       return response.data.Items.map((item) => {
         return SearchHint.constructFromBaseItem(item);
       });
     } catch (err) {
       this.logger.error(
-        `Unabele to retrieve random items from Jellyfin: ${err}`,
+        `Unable to retrieve random items from Jellyfin: ${err}`,
       );
       return [];
     }
   }
 
-  private transformToSearchHint(jellyifnHint: JellyfinSearchHint) {
+  private transformToSearchHintFromHint(jellyifnHint: JellyfinSearchHint) {
     switch (jellyifnHint.Type) {
       case BaseItemKind[BaseItemKind.Audio]:
         return SearchHint.constructFromHint(jellyifnHint);
@@ -227,7 +255,23 @@ export class JellyfinSearchService {
         this.logger.warn(
           `Received unexpected item type from Jellyfin search: ${jellyifnHint.Type}`,
         );
-        return null;
+        return undefined;
+    }
+  }
+
+  private transformToSearchHintFromBaseItemDto(baseItemDto: BaseItemDto) {
+    switch (baseItemDto.Type) {
+      case BaseItemKind[BaseItemKind.Audio]:
+        return SearchHint.constructFromBaseItem(baseItemDto);
+      case BaseItemKind[BaseItemKind.MusicAlbum]:
+        return AlbumSearchHint.constructFromBaseItem(baseItemDto);
+      case BaseItemKind[BaseItemKind.Playlist]:
+        return PlaylistSearchHint.constructFromBaseItem(baseItemDto);
+      default:
+        this.logger.warn(
+          `Received unexpected item type from Jellyfin search: ${baseItemDto.Type}`,
+        );
+        return undefined;
     }
   }
 }

src/clients/jellyfin/jellyfin.service.ts

@@ -33,18 +33,23 @@ export class JellyfinService {
       },
     });
 
-    this.api = this.jellyfin.createApi(process.env.JELLYFIN_SERVER_ADDRESS);
+    this.api = this.jellyfin.createApi(
+      process.env.JELLYFIN_SERVER_ADDRESS ?? '',
+    );
     this.logger.debug('Created Jellyfin Client and Api');
   }
 
   authenticate() {
     this.api
       .authenticateUserByName(
-        process.env.JELLYFIN_AUTHENTICATION_USERNAME,
+        process.env.JELLYFIN_AUTHENTICATION_USERNAME ?? '',
         process.env.JELLYFIN_AUTHENTICATION_PASSWORD,
       )
       .then(async (response) => {
-        if (response.data.SessionInfo === undefined) {
+        if (
+          response.data.SessionInfo === undefined ||
+          response.data.SessionInfo.UserId === undefined
+        ) {
           this.logger.error(
             `Failed to authenticate with response code ${response.status}: '${response.data}'`,
           );

src/clients/jellyfin/jellyfin.websocket.service.ts

@@ -1,13 +1,12 @@
 import {
   PlaystateCommand,
   SessionMessageType,
-  UserItemDataDto,
 } from '@jellyfin/sdk/lib/generated-client/models';
 
 import { Injectable, Logger, OnModuleDestroy } from '@nestjs/common';
 import { EventEmitter2 } from '@nestjs/event-emitter';
 import { Cron } from '@nestjs/schedule';
-import { Session } from 'inspector';
+import { convertToTracks } from 'src/utils/trackConverter';
 
 import { WebSocket } from 'ws';
 
@@ -106,15 +105,7 @@ export class JellyfinWebSocketService implements OnModuleDestroy {
           `Processing ${ids.length} ids received via websocket and adding them to the queue`,
         );
         const searchHints = await this.jellyfinSearchService.getAllById(ids);
-
-        const tracks = await Promise.all(
-          searchHints.map(async (x) =>
-            (
-              await x.toTracks(this.jellyfinSearchService)
-            ).find((x) => x !== null),
-          ),
-        );
-
+        const tracks = convertToTracks(searchHints, this.jellyfinSearchService);
         this.playbackService.getPlaylistOrDefault().enqueueTracks(tracks);
         break;
       case SessionMessageType[SessionMessageType.Playstate]:

src/commands/play/play.comands.ts

@@ -48,12 +48,12 @@ export class PlayItemCommand {
   async handler(
     @InteractionEvent(SlashCommandPipe) dto: PlayCommandParams,
     @IA() interaction: CommandInteraction,
-  ): Promise<InteractionReplyOptions | string> {
+  ) {
     await interaction.deferReply({ ephemeral: true });
 
     const baseItems = PlayCommandParams.getBaseItemKinds(dto.type);
 
-    let item: SearchHint;
+    let item: SearchHint | undefined;
     if (dto.name.startsWith('native-')) {
       item = await this.jellyfinSearchService.getById(
         dto.name.replace('native-', ''),
@@ -105,8 +105,8 @@ export class PlayItemCommand {
     this.playbackService.getPlaylistOrDefault().enqueueTracks(tracks);
 
     const remoteImage: RemoteImageInfo | undefined = tracks
-      .flatMap((x) => x.getRemoteImages())
-      .find((x) => true);
+      .flatMap((track) => track.getRemoteImages())
+      .find(() => true);
 
     await interaction.followUp({
       embeds: [
@@ -120,7 +120,7 @@ export class PlayItemCommand {
             if (!remoteImage) {
               return embedBuilder;
             }
-            return embedBuilder.setThumbnail(remoteImage.Url);
+            return embedBuilder.setThumbnail(remoteImage.Url ?? '');
           },
         }),
       ],
@@ -135,7 +135,15 @@ export class PlayItemCommand {
     }
 
     const focusedAutoCompleteAction = interaction.options.getFocused(true);
-    const typeIndex: number | null = interaction.options.getInteger('type');
+    const typeIndex = interaction.options.getInteger('type');
+
+    if (typeIndex === null) {
+      this.logger.error(
+        `Failed to get type integer from play command interaction autocomplete`,
+      );
+      return;
+    }
+
     const type = Object.values(SearchType)[typeIndex] as SearchType;
     const searchQuery = focusedAutoCompleteAction.value;
 

src/commands/playlist/playlist.interaction-collector.ts

@@ -30,7 +30,10 @@ export class PlaylistInteractionCollector {
 
   @Filter()
   filter(interaction: ButtonInteraction): boolean {
-    return this.causeInteraction.id === interaction.message.interaction.id;
+    return (
+      interaction.message.interaction !== null &&
+      this.causeInteraction.id === interaction.message.interaction.id
+    );
   }
 
   @On('collect')
@@ -55,7 +58,7 @@ export class PlaylistInteractionCollector {
     await interaction.update(reply as InteractionUpdateOptions);
   }
 
-  private getInteraction(interaction: ButtonInteraction): number | null {
+  private getInteraction(interaction: ButtonInteraction): number | undefined {
     const current = this.playlistCommand.pageData.get(this.causeInteraction.id);
 
     if (current === undefined) {

src/commands/status.command.ts

@@ -39,7 +39,7 @@ export class StatusCommand {
     const status = Status[this.client.ws.status];
 
     const interval = intervalToDuration({
-      start: this.client.uptime,
+      start: this.client.uptime ?? 0,
       end: 0,
     });
     const formattedDuration = formatDuration(interval);

src/main.ts

@@ -4,6 +4,10 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 
 function getLoggingLevels(): LogLevel[] {
+  if (!process.env.LOG_LEVEL) {
+    return ['error', 'warn', 'log'];
+  }
+
   switch (process.env.LOG_LEVEL.toLowerCase()) {
     case 'error':
       return ['error'];

src/models/search/AlbumSearchHint.ts

@@ -11,6 +11,12 @@ export class AlbumSearchHint extends SearchHint {
   }
 
   static constructFromHint(hint: JellyfinSearchHint) {
+    if (hint.Id === undefined || !hint.Name || !hint.RunTimeTicks) {
+      throw new Error(
+        'Unable to construct playlist search hint, required properties were undefined',
+      );
+    }
+
     return new AlbumSearchHint(hint.Id, hint.Name, hint.RunTimeTicks / 10000);
   }
 
@@ -24,7 +30,7 @@ export class AlbumSearchHint extends SearchHint {
         (await x.toTracks(searchService)).find((x) => x !== null),
       ),
     );
-    return tracks.map((track): Track => {
+    return tracks.map((track: Track): Track => {
       track.remoteImages = remoteImages;
       return track;
     });

src/models/search/PlaylistSearchHint.ts

@@ -4,6 +4,7 @@ import { Track } from '../shared/Track';
 import { JellyfinSearchService } from '../../clients/jellyfin/jellyfin.search.service';
 
 import { SearchHint } from './SearchHint';
+import { convertToTracks } from 'src/utils/trackConverter';
 
 export class PlaylistSearchHint extends SearchHint {
   override toString(): string {
@@ -11,6 +12,12 @@ export class PlaylistSearchHint extends SearchHint {
   }
 
   static constructFromHint(hint: JellyfinSearchHint) {
+    if (hint.Id === undefined || !hint.Name || !hint.RunTimeTicks) {
+      throw new Error(
+        'Unable to construct playlist search hint, required properties were undefined',
+      );
+    }
+
     return new PlaylistSearchHint(
       hint.Id,
       hint.Name,
@@ -22,9 +29,6 @@ export class PlaylistSearchHint extends SearchHint {
     searchService: JellyfinSearchService,
   ): Promise<Track[]> {
     const playlistItems = await searchService.getPlaylistitems(this.id);
-    const tracks = playlistItems.map(async (x) =>
-      (await x.toTracks(searchService)).find((x) => x !== null),
-    );
-    return await Promise.all(tracks);
+    return convertToTracks(playlistItems, searchService);
   }
 }

src/models/search/SearchHint.ts

@@ -26,10 +26,20 @@ export class SearchHint {
   }
 
   static constructFromHint(hint: JellyfinSearchHint) {
+    if (hint.Id === undefined || !hint.Name || !hint.RunTimeTicks) {
+      throw new Error(
+        'Unable to construct search hint, required properties were undefined',
+      );
+    }
     return new SearchHint(hint.Id, hint.Name, hint.RunTimeTicks / 10000);
   }
 
   static constructFromBaseItem(baseItem: BaseItemDto) {
+    if (baseItem.Id === undefined || !baseItem.Name || !baseItem.RunTimeTicks) {
+      throw new Error(
+        'Unable to construct search hint from base item, required properties were undefined',
+      );
+    }
     return new SearchHint(
       baseItem.Id,
       baseItem.Name,

src/models/shared/Playlist.ts

@@ -1,4 +1,4 @@
-import { EventEmitter2, OnEvent } from '@nestjs/event-emitter';
+import { EventEmitter2 } from '@nestjs/event-emitter';
 
 import { Track } from './Track';
 
@@ -24,7 +24,7 @@ export class Playlist {
    * @returns active track or undefined if there's none
    */
   getActiveTrack(): Track | undefined {
-    if (this.isActiveTrackOutOfSync()) {
+    if (this.isActiveTrackOutOfSync() || this.activeTrackIndex === undefined) {
       return undefined;
     }
     return this.tracks[this.activeTrackIndex];
@@ -51,7 +51,10 @@ export class Playlist {
   setNextTrackAsActiveTrack(): boolean {
     this.announceTrackFinishIfSet();
 
-    if (this.activeTrackIndex >= this.tracks.length) {
+    if (
+      this.activeTrackIndex === undefined ||
+      this.activeTrackIndex >= this.tracks.length
+    ) {
       return false;
     }
 
@@ -70,7 +73,7 @@ export class Playlist {
   setPreviousTrackAsActiveTrack(): boolean {
     this.announceTrackFinishIfSet();
 
-    if (this.activeTrackIndex <= 0) {
+    if (this.activeTrackIndex === undefined || this.activeTrackIndex <= 0) {
       return false;
     }
 
@@ -120,7 +123,7 @@ export class Playlist {
    * @returns if there is a track next in the playlist
    */
   hasNextTrackInPlaylist() {
-    return this.activeTrackIndex + 1 < this.tracks.length;
+    return (this.activeTrackIndex ?? 0) + 1 < this.tracks.length;
   }
 
   /**
@@ -128,7 +131,7 @@ export class Playlist {
    * @returns if there is a previous track in the playlist
    */
   hasPreviousTrackInPlaylist() {
-    return this.activeTrackIndex > 0;
+    return this.activeTrackIndex !== undefined && this.activeTrackIndex > 0;
   }
 
   clear() {
@@ -156,13 +159,20 @@ export class Playlist {
     }
 
     const activeTrack = this.getActiveTrack();
+
+    if (!activeTrack) {
+      return;
+    }
+
     activeTrack.playing = true;
     this.eventEmitter.emit('internal.audio.track.announce', activeTrack);
   }
 
   private isActiveTrackOutOfSync(): boolean {
     return (
-      this.activeTrackIndex < 0 || this.activeTrackIndex >= this.tracks.length
+      this.activeTrackIndex === undefined ||
+      this.activeTrackIndex < 0 ||
+      this.activeTrackIndex >= this.tracks.length
     );
   }
 }

src/models/shared/Track.ts

@@ -51,6 +51,6 @@ export class Track {
   }
 
   getRemoteImages(): RemoteImageInfo[] {
-    return this.remoteImages.Images;
+    return this.remoteImages?.Images ?? [];
   }
 }

src/types/websocket.ts

@@ -30,7 +30,7 @@ export class PlayNowCommand {
   }
 
   getSelection(): string[] {
-    if (this.hasSelection()) {
+    if (this.hasSelection() && this.StartIndex !== undefined) {
       return [this.ItemIds[this.StartIndex]];
     }
 

src/updates/updates.service.ts

@@ -30,6 +30,14 @@ export class UpdatesService {
     this.logger.debug('Checking for available updates...');
 
     const latestGitHubRelease = await this.fetchLatestGithubRelease();
+
+    if (!latestGitHubRelease) {
+      this.logger.warn(
+        `Aborting update check because api request failed. Please check your internet connection or disable the check`,
+      );
+      return;
+    }
+
     const currentVersion = Constants.Metadata.Version.All();
 
     if (latestGitHubRelease.tag_name <= currentVersion) {
@@ -95,21 +103,21 @@ export class UpdatesService {
     });
   }
 
-  private async fetchLatestGithubRelease(): Promise<null | GithubRelease> {
+  private async fetchLatestGithubRelease(): Promise<GithubRelease | undefined> {
     return axios({
       method: 'GET',
       url: Constants.Links.Api.GetLatestRelease,
     })
       .then((response) => {
         if (response.status !== 200) {
-          return null;
+          return undefined;
         }
 
         return response.data as GithubRelease;
       })
       .catch((err) => {
         this.logger.error('Error while checking for updates', err);
-        return null;
+        return undefined;
       });
   }
 }

src/utils/trackConverter.ts

@@ -0,0 +1,15 @@
+import { JellyfinSearchService } from 'src/clients/jellyfin/jellyfin.search.service';
+import { SearchHint } from 'src/models/search/SearchHint';
+import { Track } from 'src/models/shared/Track';
+
+export const convertToTracks = (
+  hints: SearchHint[],
+  jellyfinSearchService: JellyfinSearchService,
+): Track[] => {
+  let tracks: Track[] = [];
+  hints.forEach(async (hint) => {
+    const searchedTracks = await hint.toTracks(jellyfinSearchService);
+    tracks = [...tracks, ...searchedTracks];
+  });
+  return tracks;
+};

tsconfig.json

@@ -12,7 +12,7 @@
     "baseUrl": "./",
     "incremental": true,
     "skipLibCheck": true,
-    "strictNullChecks": false,
+    "strictNullChecks": true,
     "noImplicitAny": false,
     "strictBindCallApply": false,
     "forceConsistentCasingInFileNames": false,