diff --git a/packages/backend/src/core/ReversiService.ts b/packages/backend/src/core/ReversiService.ts
index 439d0f922ddf..3cafbc617014 100644
--- a/packages/backend/src/core/ReversiService.ts
+++ b/packages/backend/src/core/ReversiService.ts
@@ -22,12 +22,12 @@ import { IdService } from '@/core/IdService.js';
 import { NotificationService } from '@/core/NotificationService.js';
 import { Serialized } from '@/types.js';
 import { ReversiGameEntityService } from './entities/ReversiGameEntityService.js';
-import type { OnApplicationShutdown, OnModuleInit } from '@nestjs/common';
+import type { OnModuleInit } from '@nestjs/common';
 
 const MATCHING_TIMEOUT_MS = 1000 * 15; // 15sec
 
 @Injectable()
-export class ReversiService implements OnApplicationShutdown, OnModuleInit {
+export class ReversiService implements OnModuleInit {
 	private notificationService: NotificationService;
 
 	constructor(
@@ -543,13 +543,4 @@ export class ReversiService implements OnApplicationShutdown, OnModuleInit {
 			return null;
 		}
 	}
-
-	@bindThis
-	public dispose(): void {
-	}
-
-	@bindThis
-	public onApplicationShutdown(signal?: string | undefined): void {
-		this.dispose();
-	}
 }
diff --git a/packages/backend/src/core/entities/ReversiGameEntityService.ts b/packages/backend/src/core/entities/ReversiGameEntityService.ts
index 9045ca02fc76..6f90b8d690c9 100644
--- a/packages/backend/src/core/entities/ReversiGameEntityService.ts
+++ b/packages/backend/src/core/entities/ReversiGameEntityService.ts
@@ -38,8 +38,8 @@ export class ReversiGameEntityService {
 		return await awaitAll({
 			id: game.id,
 			createdAt: game.createdAt.toISOString(),
-			startedAt: game.startedAt && game.startedAt.toISOString(),
-			endedAt: game.endedAt && game.endedAt.toISOString(),
+			startedAt: game.startedAt?.toISOString() ?? null,
+			endedAt: game.endedAt?.toISOString() ?? null,
 			isStarted: game.isStarted,
 			isEnded: game.isEnded,
 			form1: game.form1,
@@ -90,8 +90,8 @@ export class ReversiGameEntityService {
 		return await awaitAll({
 			id: game.id,
 			createdAt: game.createdAt.toISOString(),
-			startedAt: game.startedAt && game.startedAt.toISOString(),
-			endedAt: game.endedAt && game.endedAt.toISOString(),
+			startedAt: game.startedAt?.toISOString() ?? null,
+			endedAt: game.endedAt?.toISOString() ?? null,
 			isStarted: game.isStarted,
 			isEnded: game.isEnded,
 			user1Id: game.user1Id,
diff --git a/packages/backend/src/server/api/endpoints/reversi/cancel-match.ts b/packages/backend/src/server/api/endpoints/reversi/cancel-match.ts
index e15a855debd6..5822d3a963f0 100644
--- a/packages/backend/src/server/api/endpoints/reversi/cancel-match.ts
+++ b/packages/backend/src/server/api/endpoints/reversi/cancel-match.ts
@@ -35,7 +35,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		super(meta, paramDef, async (ps, me) => {
 			if (ps.userId) {
 				await this.reversiService.matchSpecificUserCancel(me, ps.userId);
-				return;
 			} else {
 				await this.reversiService.matchAnyUserCancel(me);
 			}
diff --git a/packages/backend/src/server/api/endpoints/reversi/invitations.ts b/packages/backend/src/server/api/endpoints/reversi/invitations.ts
index 0b7107bb0dc8..b468f8999710 100644
--- a/packages/backend/src/server/api/endpoints/reversi/invitations.ts
+++ b/packages/backend/src/server/api/endpoints/reversi/invitations.ts
@@ -3,9 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Inject, Injectable } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import { DI } from '@/di-symbols.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { ReversiService } from '@/core/ReversiService.js';
 
diff --git a/packages/backend/src/server/api/stream/channels/reversi.ts b/packages/backend/src/server/api/stream/channels/reversi.ts
index cb4b1b8d5aa2..4ea9784ba5ea 100644
--- a/packages/backend/src/server/api/stream/channels/reversi.ts
+++ b/packages/backend/src/server/api/stream/channels/reversi.ts
@@ -13,13 +13,6 @@ class ReversiChannel extends Channel {
 	public static requireCredential = true as const;
 	public static kind = 'read:account';
 
-	constructor(
-		id: string,
-		connection: Channel['connection'],
-	) {
-		super(id, connection);
-	}
-
 	@bindThis
 	public async init(params: any) {
 		this.subscriber.on(`reversiStream:${this.user!.id}`, this.send);
@@ -38,10 +31,6 @@ export class ReversiChannelService implements MiChannelService<true> {
 	public readonly requireCredential = ReversiChannel.requireCredential;
 	public readonly kind = ReversiChannel.kind;
 
-	constructor(
-	) {
-	}
-
 	@bindThis
 	public create(id: string, connection: Channel['connection']): ReversiChannel {
 		return new ReversiChannel(
diff --git a/packages/frontend/src/components/MkTimeline.vue b/packages/frontend/src/components/MkTimeline.vue
index 893735a996ea..1bb39526401f 100644
--- a/packages/frontend/src/components/MkTimeline.vue
+++ b/packages/frontend/src/components/MkTimeline.vue
@@ -18,7 +18,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { computed, watch, onUnmounted, provide, shallowRef } from 'vue';
-import { Connection } from 'misskey-js/built/streaming.js';
+import { Connection } from 'misskey-js/streaming.js';
 import MkNotes from '@/components/MkNotes.vue';
 import MkPullToRefresh from '@/components/MkPullToRefresh.vue';
 import { useStream } from '@/stream.js';
diff --git a/packages/frontend/src/pages/reversi/game.setting.vue b/packages/frontend/src/pages/reversi/game.setting.vue
index d69176e25a6b..bfab88b2fe8d 100644
--- a/packages/frontend/src/pages/reversi/game.setting.vue
+++ b/packages/frontend/src/pages/reversi/game.setting.vue
@@ -99,7 +99,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, watch, ref, onMounted, shallowRef, onUnmounted } from 'vue';
+import { computed, watch, ref, onUnmounted } from 'vue';
 import * as Misskey from 'misskey-js';
 import * as Reversi from 'misskey-reversi';
 import { i18n } from '@/i18n.js';
diff --git a/packages/frontend/src/pages/reversi/game.vue b/packages/frontend/src/pages/reversi/game.vue
index d1e4103919eb..e4f36988db0e 100644
--- a/packages/frontend/src/pages/reversi/game.vue
+++ b/packages/frontend/src/pages/reversi/game.vue
@@ -10,7 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, watch, ref, onMounted, shallowRef, onUnmounted } from 'vue';
+import { computed, watch, onMounted, shallowRef, onUnmounted } from 'vue';
 import * as Misskey from 'misskey-js';
 import GameSetting from './game.setting.vue';
 import GameBoard from './game.board.vue';
diff --git a/packages/misskey-bubble-game/src/game.ts b/packages/misskey-bubble-game/src/game.ts
index e01a011eeeac..8a0cbf01b1e4 100644
--- a/packages/misskey-bubble-game/src/game.ts
+++ b/packages/misskey-bubble-game/src/game.ts
@@ -87,6 +87,7 @@ export class DropAndFusionGame extends EventEmitter<{
 			case 'square': return SQUARE_MONOS;
 			case 'sweets': return SWEETS_MONOS;
 			case 'space': return NORAML_MONOS;
+			default: throw new Error('unrecognized game mode');
 		}
 	}
 
@@ -302,7 +303,6 @@ export class DropAndFusionGame extends EventEmitter<{
 					this.gameOver();
 					break;
 				}
-				continue;
 			}
 		}
 	}
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index bab518e63536..5c2e00cfdcbc 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -1,5 +1,5 @@
 import { ModerationLogPayloads } from './consts.js';
-import { Announcement, EmojiDetailed, MeDetailed, MeDetailedOnly, Page, User, UserDetailed } from './autogen/models.js';
+import { Announcement, EmojiDetailed, MeDetailed, Page, User, UserDetailed } from './autogen/models.js';
 
 export * from './autogen/entities.js';
 export * from './autogen/models.js';