From 31e82fc29a335ffc55e57ac89713a4d00de1fe93 Mon Sep 17 00:00:00 2001
From: Kisaragi <48310258+KisaragiEffective@users.noreply.github.com>
Date: Sun, 14 Jul 2024 09:33:16 +0900
Subject: [PATCH] test(backend): kill many `any` in backend test (partial)
 (#14054)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* kill any on utils:api

* kill any on timeline test

* use optional chain to kill TS2532 on timeline test
変更前: 該当ノートが見つからなければundefinedに対するプロパティアクセスとしてテストがクラッシュ
変更後: 該当ノートが見つからなければoptional chainがundefinedとして評価されるが、strictEqualの右辺がnon-nullableなためアサーションに失敗しテストがクラッシュ

* kill `as any` for ApMfmService

* kill argument any for api-visibility

* kill argument any across a few tests

* do not return value that has yielded from `await`-ing `Promise<void>`

* force cast

* runtime non-null assertion to coerce

* rewrite `assert.notEqual(expr, null)` to `assert.ok(expr)`
こうすることでassertion type扱いになり、non-nullableになる

* change return type of `failedApiCall` to `void`
戻り値がどこにも使われていない

* split bindings for exports.ts
型が合わなくて文句を言ってくるので適切に分割

* runtime non-null assertion

* runtime non-null assertion

* 何故かうまく行かないので、とりあえずXORしてみる

* Revert "何故かうまく行かないので、とりあえずXORしてみる"

This reverts commit 48cf32c930924840d0892af92d71b9437acb5844.

* castAsErrorで安全ではないキャストを隠蔽

* 型アサーションの追加

* 型アサーションの追加

* 型アサーションの追加

* voidで値を返さない

* castAsError

* assert.ok => kill nullability

* もはや明示的な型の指定は必要ない

* castAsError

* castAsError

* 型アサーションの追加

* nullableを一旦抑止

* 変数を分離して型エラーを排除

* 不要なプロパティを削除する処理を隠蔽してanyを排除

* Repository type

* simple type

* assert.ok => kill nullability

* revert `as any` drop
reverts fe95c05b3f53266108128680d9358a3796844232 partialy

* test: fix invalid assertion
partially revert b99b7b5392d9d20c81dfee1346ba8b33ff9e1fbb

* test: 52d8a54fc72b886fecb30a736b3ccf5057ea2a0c により型が合うようになった部分の`as any`を除去

* format

* test: apply https://github.com/misskey-dev/misskey/pull/14054#discussion_r1672369526 (part 1)

* test: use non-null assertion to suppress too many error

* Update packages/backend/test/utils.ts

Co-authored-by: anatawa12 <anatawa12@icloud.com>

---------

Co-authored-by: anatawa12 <anatawa12@icloud.com>
---
 .../src/core/activitypub/ApMfmService.ts      |   2 +-
 packages/backend/test/e2e/2fa.ts              |  30 +-
 packages/backend/test/e2e/api-visibility.ts   |  16 +-
 packages/backend/test/e2e/block.ts            |  12 +-
 packages/backend/test/e2e/clips.ts            |  12 +-
 packages/backend/test/e2e/endpoints.ts        |  17 +-
 packages/backend/test/e2e/exports.ts          |  70 ++---
 packages/backend/test/e2e/move.ts             |  68 +++--
 packages/backend/test/e2e/mute.ts             |  72 ++---
 packages/backend/test/e2e/note.ts             |  75 +++--
 packages/backend/test/e2e/renote-mute.ts      |  16 +-
 packages/backend/test/e2e/thread-mute.ts      |  10 +-
 packages/backend/test/e2e/timelines.ts        | 266 +++++++++---------
 packages/backend/test/unit/ApMfmService.ts    |   8 +-
 packages/backend/test/unit/FileInfoService.ts | 101 ++-----
 packages/backend/test/utils.ts                |  32 ++-
 16 files changed, 403 insertions(+), 404 deletions(-)

diff --git a/packages/backend/src/core/activitypub/ApMfmService.ts b/packages/backend/src/core/activitypub/ApMfmService.ts
index ab75b9abb..4036d2794 100644
--- a/packages/backend/src/core/activitypub/ApMfmService.ts
+++ b/packages/backend/src/core/activitypub/ApMfmService.ts
@@ -25,7 +25,7 @@ export class ApMfmService {
 	}
 
 	@bindThis
-	public getNoteHtml(note: MiNote, apAppend?: string) {
+	public getNoteHtml(note: Pick<MiNote, 'text' | 'mentionedRemoteUsers'>, apAppend?: string) {
 		let noMisskeyContent = false;
 		const srcMfm = (note.text ?? '') + (apAppend ?? '');
 
diff --git a/packages/backend/test/e2e/2fa.ts b/packages/backend/test/e2e/2fa.ts
index 13c56b88a..06548fa7d 100644
--- a/packages/backend/test/e2e/2fa.ts
+++ b/packages/backend/test/e2e/2fa.ts
@@ -206,7 +206,7 @@ describe('2要素認証', () => {
 			username,
 		}, alice);
 		assert.strictEqual(usersShowResponse.status, 200);
-		assert.strictEqual(usersShowResponse.body.twoFactorEnabled, true);
+		assert.strictEqual((usersShowResponse.body as unknown as { twoFactorEnabled: boolean }).twoFactorEnabled, true);
 
 		const signinResponse = await api('signin', {
 			...signinParam(),
@@ -248,7 +248,7 @@ describe('2要素認証', () => {
 			keyName,
 			credentialId,
 			creationOptions: registerKeyResponse.body,
-		}) as any, alice);
+		} as any) as any, alice);
 		assert.strictEqual(keyDoneResponse.status, 200);
 		assert.strictEqual(keyDoneResponse.body.id, credentialId.toString('base64url'));
 		assert.strictEqual(keyDoneResponse.body.name, keyName);
@@ -257,22 +257,22 @@ describe('2要素認証', () => {
 			username,
 		});
 		assert.strictEqual(usersShowResponse.status, 200);
-		assert.strictEqual(usersShowResponse.body.securityKeys, true);
+		assert.strictEqual((usersShowResponse.body as unknown as { securityKeys: boolean }).securityKeys, true);
 
 		const signinResponse = await api('signin', {
 			...signinParam(),
 		});
 		assert.strictEqual(signinResponse.status, 200);
 		assert.strictEqual(signinResponse.body.i, undefined);
-		assert.notEqual(signinResponse.body.challenge, undefined);
-		assert.notEqual(signinResponse.body.allowCredentials, undefined);
-		assert.strictEqual(signinResponse.body.allowCredentials[0].id, credentialId.toString('base64url'));
+		assert.notEqual((signinResponse.body as unknown as { challenge: unknown | undefined }).challenge, undefined);
+		assert.notEqual((signinResponse.body as unknown as { allowCredentials: unknown | undefined }).allowCredentials, undefined);
+		assert.strictEqual((signinResponse.body as unknown as { allowCredentials: {id: string}[] }).allowCredentials[0].id, credentialId.toString('base64url'));
 
 		const signinResponse2 = await api('signin', signinWithSecurityKeyParam({
 			keyName,
 			credentialId,
 			requestOptions: signinResponse.body,
-		}));
+		} as any));
 		assert.strictEqual(signinResponse2.status, 200);
 		assert.notEqual(signinResponse2.body.i, undefined);
 
@@ -307,7 +307,7 @@ describe('2要素認証', () => {
 			keyName,
 			credentialId,
 			creationOptions: registerKeyResponse.body,
-		}) as any, alice);
+		} as any) as any, alice);
 		assert.strictEqual(keyDoneResponse.status, 200);
 
 		const passwordLessResponse = await api('i/2fa/password-less', {
@@ -319,7 +319,7 @@ describe('2要素認証', () => {
 			username,
 		});
 		assert.strictEqual(usersShowResponse.status, 200);
-		assert.strictEqual(usersShowResponse.body.usePasswordLessLogin, true);
+		assert.strictEqual((usersShowResponse.body as unknown as { usePasswordLessLogin: boolean }).usePasswordLessLogin, true);
 
 		const signinResponse = await api('signin', {
 			...signinParam(),
@@ -333,7 +333,7 @@ describe('2要素認証', () => {
 				keyName,
 				credentialId,
 				requestOptions: signinResponse.body,
-			}),
+			} as any),
 			password: '',
 		});
 		assert.strictEqual(signinResponse2.status, 200);
@@ -370,7 +370,7 @@ describe('2要素認証', () => {
 			keyName,
 			credentialId,
 			creationOptions: registerKeyResponse.body,
-		}) as any, alice);
+		} as any) as any, alice);
 		assert.strictEqual(keyDoneResponse.status, 200);
 
 		const renamedKey = 'other-key';
@@ -383,6 +383,7 @@ describe('2要素認証', () => {
 		const iResponse = await api('i', {
 		}, alice);
 		assert.strictEqual(iResponse.status, 200);
+		assert.ok(iResponse.body.securityKeysList);
 		const securityKeys = iResponse.body.securityKeysList.filter((s: { id: string; }) => s.id === credentialId.toString('base64url'));
 		assert.strictEqual(securityKeys.length, 1);
 		assert.strictEqual(securityKeys[0].name, renamedKey);
@@ -419,13 +420,14 @@ describe('2要素認証', () => {
 			keyName,
 			credentialId,
 			creationOptions: registerKeyResponse.body,
-		}) as any, alice);
+		} as any) as any, alice);
 		assert.strictEqual(keyDoneResponse.status, 200);
 
 		// テストの実行順によっては複数残ってるので全部消す
 		const iResponse = await api('i', {
 		}, alice);
 		assert.strictEqual(iResponse.status, 200);
+		assert.ok(iResponse.body.securityKeysList);
 		for (const key of iResponse.body.securityKeysList) {
 			const removeKeyResponse = await api('i/2fa/remove-key', {
 				token: otpToken(registerResponse.body.secret),
@@ -439,7 +441,7 @@ describe('2要素認証', () => {
 			username,
 		});
 		assert.strictEqual(usersShowResponse.status, 200);
-		assert.strictEqual(usersShowResponse.body.securityKeys, false);
+		assert.strictEqual((usersShowResponse.body as unknown as { securityKeys: boolean }).securityKeys, false);
 
 		const signinResponse = await api('signin', {
 			...signinParam(),
@@ -470,7 +472,7 @@ describe('2要素認証', () => {
 			username,
 		});
 		assert.strictEqual(usersShowResponse.status, 200);
-		assert.strictEqual(usersShowResponse.body.twoFactorEnabled, true);
+		assert.strictEqual((usersShowResponse.body as unknown as { twoFactorEnabled: boolean }).twoFactorEnabled, true);
 
 		const unregisterResponse = await api('i/2fa/unregister', {
 			token: otpToken(registerResponse.body.secret),
diff --git a/packages/backend/test/e2e/api-visibility.ts b/packages/backend/test/e2e/api-visibility.ts
index c61b0c2a8..2dd645d97 100644
--- a/packages/backend/test/e2e/api-visibility.ts
+++ b/packages/backend/test/e2e/api-visibility.ts
@@ -410,21 +410,21 @@ describe('API visibility', () => {
 		test('[HTL] public-post が 自分が見れる', async () => {
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === pub.id);
+			const notes = res.body.filter(n => n.id === pub.id);
 			assert.strictEqual(notes[0].text, 'x');
 		});
 
 		test('[HTL] public-post が 非フォロワーから見れない', async () => {
 			const res = await api('notes/timeline', { limit: 100 }, other);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === pub.id);
+			const notes = res.body.filter(n => n.id === pub.id);
 			assert.strictEqual(notes.length, 0);
 		});
 
 		test('[HTL] followers-post が フォロワーから見れる', async () => {
 			const res = await api('notes/timeline', { limit: 100 }, follower);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === fol.id);
+			const notes = res.body.filter(n => n.id === fol.id);
 			assert.strictEqual(notes[0].text, 'x');
 		});
 		//#endregion
@@ -433,21 +433,21 @@ describe('API visibility', () => {
 		test('[replies] followers-reply が フォロワーから見れる', async () => {
 			const res = await api('notes/replies', { noteId: tgt.id, limit: 100 }, follower);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === folR.id);
+			const notes = res.body.filter(n => n.id === folR.id);
 			assert.strictEqual(notes[0].text, 'x');
 		});
 
 		test('[replies] followers-reply が 非フォロワー (リプライ先ではない) から見れない', async () => {
 			const res = await api('notes/replies', { noteId: tgt.id, limit: 100 }, other);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === folR.id);
+			const notes = res.body.filter(n => n.id === folR.id);
 			assert.strictEqual(notes.length, 0);
 		});
 
 		test('[replies] followers-reply が 非フォロワー (リプライ先である) から見れる', async () => {
 			const res = await api('notes/replies', { noteId: tgt.id, limit: 100 }, target);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === folR.id);
+			const notes = res.body.filter(n => n.id === folR.id);
 			assert.strictEqual(notes[0].text, 'x');
 		});
 		//#endregion
@@ -456,14 +456,14 @@ describe('API visibility', () => {
 		test('[mentions] followers-reply が 非フォロワー (リプライ先である) から見れる', async () => {
 			const res = await api('notes/mentions', { limit: 100 }, target);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === folR.id);
+			const notes = res.body.filter(n => n.id === folR.id);
 			assert.strictEqual(notes[0].text, 'x');
 		});
 
 		test('[mentions] followers-mention が 非フォロワー (メンション先である) から見れる', async () => {
 			const res = await api('notes/mentions', { limit: 100 }, target);
 			assert.strictEqual(res.status, 200);
-			const notes = res.body.filter((n: any) => n.id === folM.id);
+			const notes = res.body.filter(n => n.id === folM.id);
 			assert.strictEqual(notes[0].text, '@target x');
 		});
 		//#endregion
diff --git a/packages/backend/test/e2e/block.ts b/packages/backend/test/e2e/block.ts
index e4f798498..35b0e5938 100644
--- a/packages/backend/test/e2e/block.ts
+++ b/packages/backend/test/e2e/block.ts
@@ -6,7 +6,7 @@
 process.env.NODE_ENV = 'test';
 
 import * as assert from 'assert';
-import { api, post, signup } from '../utils.js';
+import { api, castAsError, post, signup } from '../utils.js';
 import type * as misskey from 'misskey-js';
 
 describe('Block', () => {
@@ -33,7 +33,7 @@ describe('Block', () => {
 		const res = await api('following/create', { userId: alice.id }, bob);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.id, 'c4ab57cc-4e41-45e9-bfd9-584f61e35ce0');
+		assert.strictEqual(castAsError(res.body).error.id, 'c4ab57cc-4e41-45e9-bfd9-584f61e35ce0');
 	});
 
 	test('ブロックされているユーザーにリアクションできない', async () => {
@@ -42,7 +42,8 @@ describe('Block', () => {
 		const res = await api('notes/reactions/create', { noteId: note.id, reaction: '👍' }, bob);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.id, '20ef5475-9f38-4e4c-bd33-de6d979498ec');
+		assert.ok(res.body);
+		assert.strictEqual(castAsError(res.body).error.id, '20ef5475-9f38-4e4c-bd33-de6d979498ec');
 	});
 
 	test('ブロックされているユーザーに返信できない', async () => {
@@ -51,7 +52,8 @@ describe('Block', () => {
 		const res = await api('notes/create', { replyId: note.id, text: 'yo' }, bob);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.id, 'b390d7e1-8a5e-46ed-b625-06271cafd3d3');
+		assert.ok(res.body);
+		assert.strictEqual(castAsError(res.body).error.id, 'b390d7e1-8a5e-46ed-b625-06271cafd3d3');
 	});
 
 	test('ブロックされているユーザーのノートをRenoteできない', async () => {
@@ -60,7 +62,7 @@ describe('Block', () => {
 		const res = await api('notes/create', { renoteId: note.id, text: 'yo' }, bob);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.id, 'b390d7e1-8a5e-46ed-b625-06271cafd3d3');
+		assert.strictEqual(castAsError(res.body).error.id, 'b390d7e1-8a5e-46ed-b625-06271cafd3d3');
 	});
 
 	// TODO: ユーザーリストに入れられないテスト
diff --git a/packages/backend/test/e2e/clips.ts b/packages/backend/test/e2e/clips.ts
index a229ec06f..a130c3698 100644
--- a/packages/backend/test/e2e/clips.ts
+++ b/packages/backend/test/e2e/clips.ts
@@ -79,14 +79,14 @@ describe('クリップ', () => {
 	};
 
 	const deleteClip = async (parameters: Misskey.entities.ClipsDeleteRequest, request: Partial<ApiRequest<'clips/delete'>> = {}): Promise<void> => {
-		return await successfulApiCall({
+		await successfulApiCall({
 			endpoint: 'clips/delete',
 			parameters,
 			user: alice,
 			...request,
 		}, {
 			status: 204,
-		}) as any as void;
+		});
 	};
 
 	const show = async (parameters: Misskey.entities.ClipsShowRequest, request: Partial<ApiRequest<'clips/show'>> = {}): Promise<Misskey.entities.Clip> => {
@@ -454,25 +454,25 @@ describe('クリップ', () => {
 		let aliceClip: Misskey.entities.Clip;
 
 		const favorite = async (parameters: Misskey.entities.ClipsFavoriteRequest, request: Partial<ApiRequest<'clips/favorite'>> = {}): Promise<void> => {
-			return successfulApiCall({
+			await successfulApiCall({
 				endpoint: 'clips/favorite',
 				parameters,
 				user: alice,
 				...request,
 			}, {
 				status: 204,
-			}) as any as void;
+			});
 		};
 
 		const unfavorite = async (parameters: Misskey.entities.ClipsUnfavoriteRequest, request: Partial<ApiRequest<'clips/unfavorite'>> = {}): Promise<void> => {
-			return successfulApiCall({
+			await successfulApiCall({
 				endpoint: 'clips/unfavorite',
 				parameters,
 				user: alice,
 				...request,
 			}, {
 				status: 204,
-			}) as any as void;
+			});
 		};
 
 		const myFavorites = async (request: Partial<ApiRequest<'clips/my-favorites'>> = {}): Promise<Misskey.entities.Clip[]> => {
diff --git a/packages/backend/test/e2e/endpoints.ts b/packages/backend/test/e2e/endpoints.ts
index 2b2699ecd..5aaec7f6f 100644
--- a/packages/backend/test/e2e/endpoints.ts
+++ b/packages/backend/test/e2e/endpoints.ts
@@ -10,7 +10,7 @@ import * as assert from 'assert';
 // https://github.com/node-fetch/node-fetch/pull/1664
 import { Blob } from 'node-fetch';
 import { MiUser } from '@/models/_.js';
-import { api, initTestDb, post, signup, simpleGet, uploadFile } from '../utils.js';
+import { api, castAsError, initTestDb, post, signup, simpleGet, uploadFile } from '../utils.js';
 import type * as misskey from 'misskey-js';
 
 describe('Endpoints', () => {
@@ -164,7 +164,7 @@ describe('Endpoints', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(typeof res.body === 'object' && !Array.isArray(res.body), true);
-			assert.strictEqual(res.body.id, alice.id);
+			assert.strictEqual((res.body as unknown as { id: string }).id, alice.id);
 		});
 
 		test('ユーザーが存在しなかったら怒る', async () => {
@@ -285,7 +285,8 @@ describe('Endpoints', () => {
 			}, alice);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'CANNOT_REACT_TO_RENOTE');
+			assert.ok(res.body);
+			assert.strictEqual(castAsError(res.body).error.code, 'CANNOT_REACT_TO_RENOTE');
 		});
 
 		test('引用にリアクションできる', async () => {
@@ -1063,7 +1064,7 @@ describe('Endpoints', () => {
 				userId: bob.id,
 			}, alice);
 			assert.strictEqual(res1.status, 204);
-			assert.strictEqual(res2.body?.memo, memo);
+			assert.strictEqual((res2.body as unknown as { memo: string })?.memo, memo);
 		});
 
 		test('自分に関するメモを更新できる', async () => {
@@ -1078,7 +1079,7 @@ describe('Endpoints', () => {
 				userId: alice.id,
 			}, alice);
 			assert.strictEqual(res1.status, 204);
-			assert.strictEqual(res2.body?.memo, memo);
+			assert.strictEqual((res2.body as unknown as { memo: string })?.memo, memo);
 		});
 
 		test('メモを削除できる', async () => {
@@ -1099,7 +1100,7 @@ describe('Endpoints', () => {
 			}, alice);
 
 			// memoには常に文字列かnullが入っている(5cac151)
-			assert.strictEqual(res.body.memo, null);
+			assert.strictEqual((res.body as unknown as { memo: string | null }).memo, null);
 		});
 
 		test('メモは個人ごとに独立して保存される', async () => {
@@ -1126,8 +1127,8 @@ describe('Endpoints', () => {
 				}, carol),
 			]);
 
-			assert.strictEqual(resAlice.body.memo, memoAliceToBob);
-			assert.strictEqual(resCarol.body.memo, memoCarolToBob);
+			assert.strictEqual((resAlice.body as unknown as { memo: string }).memo, memoAliceToBob);
+			assert.strictEqual((resCarol.body as unknown as { memo: string }).memo, memoCarolToBob);
 		});
 	});
 });
diff --git a/packages/backend/test/e2e/exports.ts b/packages/backend/test/e2e/exports.ts
index 80a5331a6..4bcecc971 100644
--- a/packages/backend/test/e2e/exports.ts
+++ b/packages/backend/test/e2e/exports.ts
@@ -61,14 +61,14 @@ describe('export-clips', () => {
 	});
 
 	test('basic export', async () => {
-		let res = await api('clips/create', {
+		const res1 = await api('clips/create', {
 			name: 'foo',
 			description: 'bar',
 		}, alice);
-		assert.strictEqual(res.status, 200);
+		assert.strictEqual(res1.status, 200);
 
-		res = await api('i/export-clips', {}, alice);
-		assert.strictEqual(res.status, 204);
+		const res2 = await api('i/export-clips', {}, alice);
+		assert.strictEqual(res2.status, 204);
 
 		const exported = await pollFirstDriveFile();
 		assert.strictEqual(exported[0].name, 'foo');
@@ -77,7 +77,7 @@ describe('export-clips', () => {
 	});
 
 	test('export with notes', async () => {
-		let res = await api('clips/create', {
+		const res = await api('clips/create', {
 			name: 'foo',
 			description: 'bar',
 		}, alice);
@@ -96,15 +96,15 @@ describe('export-clips', () => {
 		});
 
 		for (const note of [note1, note2]) {
-			res = await api('clips/add-note', {
+			const res2 = await api('clips/add-note', {
 				clipId: clip.id,
 				noteId: note.id,
 			}, alice);
-			assert.strictEqual(res.status, 204);
+			assert.strictEqual(res2.status, 204);
 		}
 
-		res = await api('i/export-clips', {}, alice);
-		assert.strictEqual(res.status, 204);
+		const res3 = await api('i/export-clips', {}, alice);
+		assert.strictEqual(res3.status, 204);
 
 		const exported = await pollFirstDriveFile();
 		assert.strictEqual(exported[0].name, 'foo');
@@ -116,19 +116,19 @@ describe('export-clips', () => {
 	});
 
 	test('multiple clips', async () => {
-		let res = await api('clips/create', {
+		const res1 = await api('clips/create', {
 			name: 'kawaii',
 			description: 'kawaii',
 		}, alice);
-		assert.strictEqual(res.status, 200);
-		const clip1 = res.body;
+		assert.strictEqual(res1.status, 200);
+		const clip1 = res1.body;
 
-		res = await api('clips/create', {
+		const res2 = await api('clips/create', {
 			name: 'yuri',
 			description: 'yuri',
 		}, alice);
-		assert.strictEqual(res.status, 200);
-		const clip2 = res.body;
+		assert.strictEqual(res2.status, 200);
+		const clip2 = res2.body;
 
 		const note1 = await post(alice, {
 			text: 'baz1',
@@ -138,20 +138,26 @@ describe('export-clips', () => {
 			text: 'baz2',
 		});
 
-		res = await api('clips/add-note', {
-			clipId: clip1.id,
-			noteId: note1.id,
-		}, alice);
-		assert.strictEqual(res.status, 204);
+		{
+			const res = await api('clips/add-note', {
+				clipId: clip1.id,
+				noteId: note1.id,
+			}, alice);
+			assert.strictEqual(res.status, 204);
+		}
 
-		res = await api('clips/add-note', {
-			clipId: clip2.id,
-			noteId: note2.id,
-		}, alice);
-		assert.strictEqual(res.status, 204);
+		{
+			const res = await api('clips/add-note', {
+				clipId: clip2.id,
+				noteId: note2.id,
+			}, alice);
+			assert.strictEqual(res.status, 204);
+		}
 
-		res = await api('i/export-clips', {}, alice);
-		assert.strictEqual(res.status, 204);
+		{
+			const res = await api('i/export-clips', {}, alice);
+			assert.strictEqual(res.status, 204);
+		}
 
 		const exported = await pollFirstDriveFile();
 		assert.strictEqual(exported[0].name, 'kawaii');
@@ -163,7 +169,7 @@ describe('export-clips', () => {
 	});
 
 	test('Clipping other user\'s note', async () => {
-		let res = await api('clips/create', {
+		const res = await api('clips/create', {
 			name: 'kawaii',
 			description: 'kawaii',
 		}, alice);
@@ -175,14 +181,14 @@ describe('export-clips', () => {
 			visibility: 'followers',
 		});
 
-		res = await api('clips/add-note', {
+		const res2 = await api('clips/add-note', {
 			clipId: clip.id,
 			noteId: note.id,
 		}, alice);
-		assert.strictEqual(res.status, 204);
+		assert.strictEqual(res2.status, 204);
 
-		res = await api('i/export-clips', {}, alice);
-		assert.strictEqual(res.status, 204);
+		const res3 = await api('i/export-clips', {}, alice);
+		assert.strictEqual(res3.status, 204);
 
 		const exported = await pollFirstDriveFile();
 		assert.strictEqual(exported[0].name, 'kawaii');
diff --git a/packages/backend/test/e2e/move.ts b/packages/backend/test/e2e/move.ts
index 35240cd3c..fd798bdb2 100644
--- a/packages/backend/test/e2e/move.ts
+++ b/packages/backend/test/e2e/move.ts
@@ -13,14 +13,14 @@ import { loadConfig } from '@/config.js';
 import { MiRepository, MiUser, UsersRepository, miRepository } from '@/models/_.js';
 import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { jobQueue } from '@/boot/common.js';
-import { api, initTestDb, signup, successfulApiCall, uploadFile } from '../utils.js';
+import { api, castAsError, initTestDb, signup, successfulApiCall, uploadFile } from '../utils.js';
 import type * as misskey from 'misskey-js';
 
 describe('Account Move', () => {
 	let jq: INestApplicationContext;
 	let url: URL;
 
-	let root: any;
+	let root: misskey.entities.SignupResponse;
 	let alice: misskey.entities.SignupResponse;
 	let bob: misskey.entities.SignupResponse;
 	let carol: misskey.entities.SignupResponse;
@@ -93,8 +93,8 @@ describe('Account Move', () => {
 			}, bob);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'NO_SUCH_USER');
-			assert.strictEqual(res.body.error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
+			assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_USER');
+			assert.strictEqual(castAsError(res.body).error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
 		});
 
 		test('Unable to add duplicated aliases to alsoKnownAs', async () => {
@@ -103,8 +103,8 @@ describe('Account Move', () => {
 			}, bob);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'INVALID_PARAM');
-			assert.strictEqual(res.body.error.id, '3d81ceae-475f-4600-b2a8-2bc116157532');
+			assert.strictEqual(castAsError(res.body).error.code, 'INVALID_PARAM');
+			assert.strictEqual(castAsError(res.body).error.id, '3d81ceae-475f-4600-b2a8-2bc116157532');
 		});
 
 		test('Unable to add itself', async () => {
@@ -113,8 +113,8 @@ describe('Account Move', () => {
 			}, bob);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'FORBIDDEN_TO_SET_YOURSELF');
-			assert.strictEqual(res.body.error.id, '25c90186-4ab0-49c8-9bba-a1fa6c202ba4');
+			assert.strictEqual(castAsError(res.body).error.code, 'FORBIDDEN_TO_SET_YOURSELF');
+			assert.strictEqual(castAsError(res.body).error.id, '25c90186-4ab0-49c8-9bba-a1fa6c202ba4');
 		});
 
 		test('Unable to add a nonexisting local account to alsoKnownAs', async () => {
@@ -123,16 +123,16 @@ describe('Account Move', () => {
 			}, bob);
 
 			assert.strictEqual(res1.status, 400);
-			assert.strictEqual(res1.body.error.code, 'NO_SUCH_USER');
-			assert.strictEqual(res1.body.error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
+			assert.strictEqual(castAsError(res1.body).error.code, 'NO_SUCH_USER');
+			assert.strictEqual(castAsError(res1.body).error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
 
 			const res2 = await api('i/update', {
 				alsoKnownAs: ['@alice', 'nonexist'],
 			}, bob);
 
 			assert.strictEqual(res2.status, 400);
-			assert.strictEqual(res2.body.error.code, 'NO_SUCH_USER');
-			assert.strictEqual(res2.body.error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
+			assert.strictEqual(castAsError(res2.body).error.code, 'NO_SUCH_USER');
+			assert.strictEqual(castAsError(res2.body).error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
 		});
 
 		test('Able to add two existing local account to alsoKnownAs', async () => {
@@ -241,8 +241,8 @@ describe('Account Move', () => {
 			}, root);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'NOT_ROOT_FORBIDDEN');
-			assert.strictEqual(res.body.error.id, '4362e8dc-731f-4ad8-a694-be2a88922a24');
+			assert.strictEqual(castAsError(res.body).error.code, 'NOT_ROOT_FORBIDDEN');
+			assert.strictEqual(castAsError(res.body).error.id, '4362e8dc-731f-4ad8-a694-be2a88922a24');
 		});
 
 		test('Unable to move to a nonexisting local account', async () => {
@@ -251,8 +251,8 @@ describe('Account Move', () => {
 			}, alice);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'NO_SUCH_USER');
-			assert.strictEqual(res.body.error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
+			assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_USER');
+			assert.strictEqual(castAsError(res.body).error.id, 'fcd2eef9-a9b2-4c4f-8624-038099e90aa5');
 		});
 
 		test('Unable to move if alsoKnownAs is invalid', async () => {
@@ -261,8 +261,8 @@ describe('Account Move', () => {
 			}, alice);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'DESTINATION_ACCOUNT_FORBIDS');
-			assert.strictEqual(res.body.error.id, 'b5c90186-4ab0-49c8-9bba-a1f766282ba4');
+			assert.strictEqual(castAsError(res.body).error.code, 'DESTINATION_ACCOUNT_FORBIDS');
+			assert.strictEqual(castAsError(res.body).error.id, 'b5c90186-4ab0-49c8-9bba-a1f766282ba4');
 		});
 
 		test('Relationships have been properly migrated', async () => {
@@ -279,36 +279,44 @@ describe('Account Move', () => {
 				userId: alice.id,
 			}, alice);
 			assert.strictEqual(aliceFollowings.status, 200);
+			assert.ok(aliceFollowings);
 			assert.strictEqual(aliceFollowings.body.length, 3);
 
 			const carolFollowings = await api('users/following', {
 				userId: carol.id,
 			}, carol);
 			assert.strictEqual(carolFollowings.status, 200);
+			assert.ok(carolFollowings);
 			assert.strictEqual(carolFollowings.body.length, 2);
 			assert.strictEqual(carolFollowings.body[0].followeeId, bob.id);
 			assert.strictEqual(carolFollowings.body[1].followeeId, alice.id);
 
 			const blockings = await api('blocking/list', {}, dave);
 			assert.strictEqual(blockings.status, 200);
+			assert.ok(blockings);
 			assert.strictEqual(blockings.body.length, 2);
 			assert.strictEqual(blockings.body[0].blockeeId, bob.id);
 			assert.strictEqual(blockings.body[1].blockeeId, alice.id);
 
 			const mutings = await api('mute/list', {}, dave);
 			assert.strictEqual(mutings.status, 200);
+			assert.ok(mutings);
 			assert.strictEqual(mutings.body.length, 2);
 			assert.strictEqual(mutings.body[0].muteeId, bob.id);
 			assert.strictEqual(mutings.body[1].muteeId, alice.id);
 
 			const rootLists = await api('users/lists/list', {}, root);
 			assert.strictEqual(rootLists.status, 200);
+			assert.ok(rootLists);
+			assert.ok(rootLists.body[0].userIds);
 			assert.strictEqual(rootLists.body[0].userIds.length, 2);
 			assert.ok(rootLists.body[0].userIds.find((id: string) => id === bob.id));
 			assert.ok(rootLists.body[0].userIds.find((id: string) => id === alice.id));
 
 			const eveLists = await api('users/lists/list', {}, eve);
 			assert.strictEqual(eveLists.status, 200);
+			assert.ok(eveLists);
+			assert.ok(eveLists.body[0].userIds);
 			assert.strictEqual(eveLists.body[0].userIds.length, 1);
 			assert.ok(eveLists.body[0].userIds.find((id: string) => id === bob.id));
 		});
@@ -347,8 +355,8 @@ describe('Account Move', () => {
 			}, bob);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'DESTINATION_ACCOUNT_FORBIDS');
-			assert.strictEqual(res.body.error.id, 'b5c90186-4ab0-49c8-9bba-a1f766282ba4');
+			assert.strictEqual(castAsError(res.body).error.code, 'DESTINATION_ACCOUNT_FORBIDS');
+			assert.strictEqual(castAsError(res.body).error.id, 'b5c90186-4ab0-49c8-9bba-a1f766282ba4');
 		});
 
 		test('Follow and follower counts are properly adjusted', async () => {
@@ -419,8 +427,9 @@ describe('Account Move', () => {
 		] as const)('Prohibit access after moving: %s', async (endpoint) => {
 			const res = await api(endpoint, {}, alice);
 			assert.strictEqual(res.status, 403);
-			assert.strictEqual(res.body.error.code, 'YOUR_ACCOUNT_MOVED');
-			assert.strictEqual(res.body.error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
+			assert.ok(res.body);
+			assert.strictEqual(castAsError(res.body).error.code, 'YOUR_ACCOUNT_MOVED');
+			assert.strictEqual(castAsError(res.body).error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
 		});
 
 		test('Prohibit access after moving: /antennas/update', async () => {
@@ -438,16 +447,19 @@ describe('Account Move', () => {
 			}, alice);
 
 			assert.strictEqual(res.status, 403);
-			assert.strictEqual(res.body.error.code, 'YOUR_ACCOUNT_MOVED');
-			assert.strictEqual(res.body.error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
+			assert.ok(res.body);
+			assert.strictEqual(castAsError(res.body).error.code, 'YOUR_ACCOUNT_MOVED');
+			assert.strictEqual(castAsError(res.body).error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
 		});
 
 		test('Prohibit access after moving: /drive/files/create', async () => {
+			// FIXME: 一旦逃げておく
 			const res = await uploadFile(alice);
 
 			assert.strictEqual(res.status, 403);
-			assert.strictEqual((res.body! as any as { error: misskey.api.APIError }).error.code, 'YOUR_ACCOUNT_MOVED');
-			assert.strictEqual((res.body! as any as { error: misskey.api.APIError }).error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
+			assert.ok(res.body);
+			assert.strictEqual(castAsError(res.body).error.code, 'YOUR_ACCOUNT_MOVED');
+			assert.strictEqual(castAsError(res.body).error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
 		});
 
 		test('Prohibit updating alsoKnownAs after moving', async () => {
@@ -456,8 +468,8 @@ describe('Account Move', () => {
 			}, alice);
 
 			assert.strictEqual(res.status, 403);
-			assert.strictEqual(res.body.error.code, 'YOUR_ACCOUNT_MOVED');
-			assert.strictEqual(res.body.error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
+			assert.strictEqual(castAsError(res.body).error.code, 'YOUR_ACCOUNT_MOVED');
+			assert.strictEqual(castAsError(res.body).error.id, '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31');
 		});
 	});
 });
diff --git a/packages/backend/test/e2e/mute.ts b/packages/backend/test/e2e/mute.ts
index 0e52c5dec..f37da288b 100644
--- a/packages/backend/test/e2e/mute.ts
+++ b/packages/backend/test/e2e/mute.ts
@@ -47,8 +47,8 @@ describe('Mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+		assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 	});
 
 	test('ミュートしているユーザーからメンションされても、hasUnreadMentions が true にならない', async () => {
@@ -92,9 +92,9 @@ describe('Mute', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test('タイムラインにミュートしているユーザーの投稿のRenoteが含まれない', async () => {
@@ -108,9 +108,9 @@ describe('Mute', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 	});
 
@@ -124,8 +124,8 @@ describe('Mute', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのリプライが含まれない', async () => {
@@ -138,8 +138,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのリプライが含まれない', async () => {
@@ -152,8 +152,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからの引用リノートが含まれない', async () => {
@@ -166,8 +166,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのリノートが含まれない', async () => {
@@ -180,8 +180,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのフォロー通知が含まれない', async () => {
@@ -193,8 +193,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 
 			await api('following/delete', { userId: alice.id }, bob);
 			await api('following/delete', { userId: alice.id }, carol);
@@ -210,8 +210,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 
 			await api('following/delete', { userId: alice.id }, bob);
 			await api('following/delete', { userId: alice.id }, carol);
@@ -228,8 +228,8 @@ describe('Mute', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 		test('通知にミュートしているユーザーからのリプライが含まれない', async () => {
 			const aliceNote = await post(alice, { text: 'hi' });
@@ -241,8 +241,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのリプライが含まれない', async () => {
@@ -255,8 +255,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからの引用リノートが含まれない', async () => {
@@ -269,8 +269,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのリノートが含まれない', async () => {
@@ -283,8 +283,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 
 		test('通知にミュートしているユーザーからのフォロー通知が含まれない', async () => {
@@ -296,8 +296,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 
 			await api('following/delete', { userId: alice.id }, bob);
 			await api('following/delete', { userId: alice.id }, carol);
@@ -313,8 +313,8 @@ describe('Mute', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === bob.id), true);
-			assert.strictEqual(res.body.some((notification: any) => notification.userId === carol.id), false);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === bob.id), true);
+			assert.strictEqual(res.body.some(notification => 'userId' in notification && notification.userId === carol.id), false);
 		});
 	});
 });
diff --git a/packages/backend/test/e2e/note.ts b/packages/backend/test/e2e/note.ts
index 7ce9f47bc..5937eb9b4 100644
--- a/packages/backend/test/e2e/note.ts
+++ b/packages/backend/test/e2e/note.ts
@@ -3,16 +3,18 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import type { Repository } from "typeorm";
+
 process.env.NODE_ENV = 'test';
 
 import * as assert from 'assert';
 import { MiNote } from '@/models/Note.js';
 import { MAX_NOTE_TEXT_LENGTH } from '@/const.js';
-import { api, initTestDb, post, role, signup, uploadFile, uploadUrl } from '../utils.js';
+import { api, castAsError, initTestDb, post, role, signup, uploadFile, uploadUrl } from '../utils.js';
 import type * as misskey from 'misskey-js';
 
 describe('Note', () => {
-	let Notes: any;
+	let Notes: Repository<MiNote>;
 
 	let root: misskey.entities.SignupResponse;
 	let alice: misskey.entities.SignupResponse;
@@ -61,8 +63,8 @@ describe('Note', () => {
 		}, alice);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.code, 'NO_SUCH_FILE');
-		assert.strictEqual(res.body.error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
+		assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_FILE');
+		assert.strictEqual(castAsError(res.body).error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
 	}, 1000 * 10);
 
 	test('存在しないファイルで怒られる', async () => {
@@ -72,8 +74,8 @@ describe('Note', () => {
 		}, alice);
 
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.code, 'NO_SUCH_FILE');
-		assert.strictEqual(res.body.error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
+		assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_FILE');
+		assert.strictEqual(castAsError(res.body).error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
 	});
 
 	test('不正なファイルIDで怒られる', async () => {
@@ -81,8 +83,8 @@ describe('Note', () => {
 			fileIds: ['kyoppie'],
 		}, alice);
 		assert.strictEqual(res.status, 400);
-		assert.strictEqual(res.body.error.code, 'NO_SUCH_FILE');
-		assert.strictEqual(res.body.error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
+		assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_FILE');
+		assert.strictEqual(castAsError(res.body).error.id, 'b6992544-63e7-67f0-fa7f-32444b1b5306');
 	});
 
 	test('返信できる', async () => {
@@ -101,6 +103,7 @@ describe('Note', () => {
 		assert.strictEqual(typeof res.body === 'object' && !Array.isArray(res.body), true);
 		assert.strictEqual(res.body.createdNote.text, alicePost.text);
 		assert.strictEqual(res.body.createdNote.replyId, alicePost.replyId);
+		assert.ok(res.body.createdNote.reply);
 		assert.strictEqual(res.body.createdNote.reply.text, bobPost.text);
 	});
 
@@ -118,6 +121,7 @@ describe('Note', () => {
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(typeof res.body === 'object' && !Array.isArray(res.body), true);
 		assert.strictEqual(res.body.createdNote.renoteId, alicePost.renoteId);
+		assert.ok(res.body.createdNote.renote);
 		assert.strictEqual(res.body.createdNote.renote.text, bobPost.text);
 	});
 
@@ -137,6 +141,7 @@ describe('Note', () => {
 		assert.strictEqual(typeof res.body === 'object' && !Array.isArray(res.body), true);
 		assert.strictEqual(res.body.createdNote.text, alicePost.text);
 		assert.strictEqual(res.body.createdNote.renoteId, alicePost.renoteId);
+		assert.ok(res.body.createdNote.renote);
 		assert.strictEqual(res.body.createdNote.renote.text, bobPost.text);
 	});
 
@@ -218,7 +223,7 @@ describe('Note', () => {
 		}, bob);
 
 		assert.strictEqual(bobReply.status, 400);
-		assert.strictEqual(bobReply.body.error.code, 'CANNOT_REPLY_TO_AN_INVISIBLE_NOTE');
+		assert.strictEqual(castAsError(bobReply.body).error.code, 'CANNOT_REPLY_TO_AN_INVISIBLE_NOTE');
 	});
 
 	test('visibility: specifiedなノートに対してvisibility: specifiedで返信できる', async () => {
@@ -256,7 +261,7 @@ describe('Note', () => {
 		}, bob);
 
 		assert.strictEqual(bobReply.status, 400);
-		assert.strictEqual(bobReply.body.error.code, 'CANNOT_REPLY_TO_SPECIFIED_VISIBILITY_NOTE_WITH_EXTENDED_VISIBILITY');
+		assert.strictEqual(castAsError(bobReply.body).error.code, 'CANNOT_REPLY_TO_SPECIFIED_VISIBILITY_NOTE_WITH_EXTENDED_VISIBILITY');
 	});
 
 	test('文字数ぎりぎりで怒られない', async () => {
@@ -333,6 +338,7 @@ describe('Note', () => {
 		assert.strictEqual(res.body.createdNote.text, post.text);
 
 		const noteDoc = await Notes.findOneBy({ id: res.body.createdNote.id });
+		assert.ok(noteDoc);
 		assert.deepStrictEqual(noteDoc.mentions, [bob.id]);
 	});
 
@@ -345,6 +351,7 @@ describe('Note', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(typeof res.body === 'object' && !Array.isArray(res.body), true);
+			assert.ok(res.body.createdNote.files);
 			assert.strictEqual(res.body.createdNote.files.length, 1);
 			assert.strictEqual(res.body.createdNote.files[0].id, file.body!.id);
 		});
@@ -363,8 +370,9 @@ describe('Note', () => {
 
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
-			const myNote = res.body.find((note: { id: string; files: { id: string }[] }) => note.id === createdNote.body.createdNote.id);
-			assert.notEqual(myNote, null);
+			const myNote = res.body.find(note => note.id === createdNote.body.createdNote.id);
+			assert.ok(myNote);
+			assert.ok(myNote.files);
 			assert.strictEqual(myNote.files.length, 1);
 			assert.strictEqual(myNote.files[0].id, file.body!.id);
 		});
@@ -389,7 +397,9 @@ describe('Note', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 			const myNote = res.body.find((note: { id: string }) => note.id === renoted.body.createdNote.id);
-			assert.notEqual(myNote, null);
+			assert.ok(myNote);
+			assert.ok(myNote.renote);
+			assert.ok(myNote.renote.files);
 			assert.strictEqual(myNote.renote.files.length, 1);
 			assert.strictEqual(myNote.renote.files[0].id, file.body!.id);
 		});
@@ -415,7 +425,9 @@ describe('Note', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 			const myNote = res.body.find((note: { id: string }) => note.id === reply.body.createdNote.id);
-			assert.notEqual(myNote, null);
+			assert.ok(myNote);
+			assert.ok(myNote.reply);
+			assert.ok(myNote.reply.files);
 			assert.strictEqual(myNote.reply.files.length, 1);
 			assert.strictEqual(myNote.reply.files[0].id, file.body!.id);
 		});
@@ -446,7 +458,10 @@ describe('Note', () => {
 			assert.strictEqual(res.status, 200);
 			assert.strictEqual(Array.isArray(res.body), true);
 			const myNote = res.body.find((note: { id: string }) => note.id === renoted.body.createdNote.id);
-			assert.notEqual(myNote, null);
+			assert.ok(myNote);
+			assert.ok(myNote.renote);
+			assert.ok(myNote.renote.reply);
+			assert.ok(myNote.renote.reply.files);
 			assert.strictEqual(myNote.renote.reply.files.length, 1);
 			assert.strictEqual(myNote.renote.reply.files[0].id, file.body!.id);
 		});
@@ -474,7 +489,7 @@ describe('Note', () => {
 						priority: 0,
 						value: true,
 					},
-				} as any,
+				},
 			}, root);
 
 			assert.strictEqual(res.status, 200);
@@ -498,7 +513,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(liftnsfw.status, 400);
-			assert.strictEqual(liftnsfw.body.error.code, 'RESTRICTED_BY_ROLE');
+			assert.strictEqual(castAsError(liftnsfw.body).error.code, 'RESTRICTED_BY_ROLE');
 
 			const oldaddnsfw = await api('drive/files/update', {
 				fileId: file.body!.id,
@@ -710,7 +725,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(note1.status, 400);
-			assert.strictEqual(note1.body.error.code, 'CONTAINS_PROHIBITED_WORDS');
+			assert.strictEqual(castAsError(note1.body).error.code, 'CONTAINS_PROHIBITED_WORDS');
 		});
 
 		test('禁止ワードを含む投稿はエラーになる (正規表現)', async () => {
@@ -727,7 +742,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(note2.status, 400);
-			assert.strictEqual(note2.body.error.code, 'CONTAINS_PROHIBITED_WORDS');
+			assert.strictEqual(castAsError(note2.body).error.code, 'CONTAINS_PROHIBITED_WORDS');
 		});
 
 		test('禁止ワードを含む投稿はエラーになる (スペースアンド)', async () => {
@@ -744,7 +759,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(note2.status, 400);
-			assert.strictEqual(note2.body.error.code, 'CONTAINS_PROHIBITED_WORDS');
+			assert.strictEqual(castAsError(note2.body).error.code, 'CONTAINS_PROHIBITED_WORDS');
 		});
 
 		test('禁止ワードを含んでるリモートノートもエラーになる', async () => {
@@ -786,7 +801,7 @@ describe('Note', () => {
 						priority: 1,
 						value: 0,
 					},
-				} as any,
+				},
 			}, root);
 
 			assert.strictEqual(res.status, 200);
@@ -807,7 +822,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(note.status, 400);
-			assert.strictEqual(note.body.error.code, 'CONTAINS_TOO_MANY_MENTIONS');
+			assert.strictEqual(castAsError(note.body).error.code, 'CONTAINS_TOO_MANY_MENTIONS');
 
 			await api('admin/roles/unassign', {
 				userId: alice.id,
@@ -840,7 +855,7 @@ describe('Note', () => {
 						priority: 1,
 						value: 0,
 					},
-				} as any,
+				},
 			}, root);
 
 			assert.strictEqual(res.status, 200);
@@ -863,7 +878,7 @@ describe('Note', () => {
 			}, alice);
 
 			assert.strictEqual(note.status, 400);
-			assert.strictEqual(note.body.error.code, 'CONTAINS_TOO_MANY_MENTIONS');
+			assert.strictEqual(castAsError(note.body).error.code, 'CONTAINS_TOO_MANY_MENTIONS');
 
 			await api('admin/roles/unassign', {
 				userId: alice.id,
@@ -896,7 +911,7 @@ describe('Note', () => {
 						priority: 1,
 						value: 1,
 					},
-				} as any,
+				},
 			}, root);
 
 			assert.strictEqual(res.status, 200);
@@ -951,6 +966,7 @@ describe('Note', () => {
 
 			assert.strictEqual(deleteOneRes.status, 204);
 			let mainNote = await Notes.findOneBy({ id: mainNoteRes.body.createdNote.id });
+			assert.ok(mainNote);
 			assert.strictEqual(mainNote.repliesCount, 1);
 
 			const deleteTwoRes = await api('notes/delete', {
@@ -959,6 +975,7 @@ describe('Note', () => {
 
 			assert.strictEqual(deleteTwoRes.status, 204);
 			mainNote = await Notes.findOneBy({ id: mainNoteRes.body.createdNote.id });
+			assert.ok(mainNote);
 			assert.strictEqual(mainNote.repliesCount, 0);
 		});
 	});
@@ -980,7 +997,7 @@ describe('Note', () => {
 				}, alice);
 
 				assert.strictEqual(res.status, 400);
-				assert.strictEqual(res.body.error.code, 'UNAVAILABLE');
+				assert.strictEqual(castAsError(res.body).error.code, 'UNAVAILABLE');
 			});
 
 			afterAll(async () => {
@@ -992,7 +1009,7 @@ describe('Note', () => {
 			const res = await api('notes/translate', { noteId: 'foo', targetLang: 'ja' }, alice);
 
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'NO_SUCH_NOTE');
+			assert.strictEqual(castAsError(res.body).error.code, 'NO_SUCH_NOTE');
 		});
 
 		test('不可視なノートは翻訳できない', async () => {
@@ -1000,7 +1017,7 @@ describe('Note', () => {
 			const bobTranslateAttempt = await api('notes/translate', { noteId: aliceNote.id, targetLang: 'ja' }, bob);
 
 			assert.strictEqual(bobTranslateAttempt.status, 400);
-			assert.strictEqual(bobTranslateAttempt.body.error.code, 'CANNOT_TRANSLATE_INVISIBLE_NOTE');
+			assert.strictEqual(castAsError(bobTranslateAttempt.body).error.code, 'CANNOT_TRANSLATE_INVISIBLE_NOTE');
 		});
 
 		test('text: null なノートを翻訳すると空のレスポンスが返ってくる', async () => {
@@ -1016,7 +1033,7 @@ describe('Note', () => {
 
 			// NOTE: デフォルトでは登録されていないので落ちる
 			assert.strictEqual(res.status, 400);
-			assert.strictEqual(res.body.error.code, 'UNAVAILABLE');
+			assert.strictEqual(castAsError(res.body).error.code, 'UNAVAILABLE');
 		});
 	});
 });
diff --git a/packages/backend/test/e2e/renote-mute.ts b/packages/backend/test/e2e/renote-mute.ts
index f6895c43d..0f636b9ae 100644
--- a/packages/backend/test/e2e/renote-mute.ts
+++ b/packages/backend/test/e2e/renote-mute.ts
@@ -42,9 +42,9 @@ describe('Renote Mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolRenote.id), false);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === carolRenote.id), false);
+		assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
 	});
 
 	test('タイムラインにリノートミュートしているユーザーの引用が含まれる', async () => {
@@ -59,9 +59,9 @@ describe('Renote Mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolRenote.id), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === carolRenote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
 	});
 
 	// #12956
@@ -76,8 +76,8 @@ describe('Renote Mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === bobRenote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
+		assert.strictEqual(res.body.some(note => note.id === bobRenote.id), true);
 	});
 
 	test('ストリームにリノートミュートしているユーザーのリノートが流れない', async () => {
diff --git a/packages/backend/test/e2e/thread-mute.ts b/packages/backend/test/e2e/thread-mute.ts
index 53bb6eb76..1ac99df88 100644
--- a/packages/backend/test/e2e/thread-mute.ts
+++ b/packages/backend/test/e2e/thread-mute.ts
@@ -33,9 +33,9 @@ describe('Note thread mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolReply.id), false);
-		assert.strictEqual(res.body.some((note: any) => note.id === carolReplyWithoutMention.id), false);
+		assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+		assert.strictEqual(res.body.some(note => note.id === carolReply.id), false);
+		assert.strictEqual(res.body.some(note => note.id === carolReplyWithoutMention.id), false);
 	});
 
 	test('ミュートしているスレッドからメンションされても、hasUnreadMentions が true にならない', async () => {
@@ -93,8 +93,8 @@ describe('Note thread mute', () => {
 
 		assert.strictEqual(res.status, 200);
 		assert.strictEqual(Array.isArray(res.body), true);
-		assert.strictEqual(res.body.some((notification: any) => notification.note.id === carolReply.id), false);
-		assert.strictEqual(res.body.some((notification: any) => notification.note.id === carolReplyWithoutMention.id), false);
+		assert.strictEqual(res.body.some(notification => 'note' in notification && notification.note.id === carolReply.id), false);
+		assert.strictEqual(res.body.some(notification => 'note' in notification && notification.note.id === carolReplyWithoutMention.id), false);
 
 		// NOTE: bobの投稿はスレッドミュート前に行われたため通知に含まれていてもよい
 	});
diff --git a/packages/backend/test/e2e/timelines.ts b/packages/backend/test/e2e/timelines.ts
index fccc052d9..540b866b2 100644
--- a/packages/backend/test/e2e/timelines.ts
+++ b/packages/backend/test/e2e/timelines.ts
@@ -37,8 +37,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === aliceNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === aliceNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('フォローしているユーザーのノートが含まれる', async () => {
@@ -53,8 +53,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーの visibility: followers なノートが含まれる', async () => {
@@ -69,9 +69,9 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id)?.text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: false でフォローしているユーザーの他人への返信が含まれない', async () => {
@@ -86,8 +86,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーの他人への返信が含まれる', async () => {
@@ -103,8 +103,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーの他人へのDM返信が含まれない', async () => {
@@ -120,8 +120,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーの他人の visibility: followers な投稿への返信が含まれない', async () => {
@@ -137,8 +137,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーの行った別のフォローしているユーザーの visibility: followers な投稿への返信が含まれる', async () => {
@@ -156,9 +156,9 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === carolNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === carolNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーの行った別のフォローしているユーザーの投稿への visibility: specified な返信が含まれない', async () => {
@@ -175,8 +175,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
 		});
 
 		test.concurrent('withReplies: false でフォローしているユーザーのそのユーザー自身への返信が含まれる', async () => {
@@ -191,8 +191,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		});
 
 		test.concurrent('withReplies: false でフォローしているユーザーからの自分への返信が含まれる', async () => {
@@ -207,8 +207,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('自分の他人への返信が含まれる', async () => {
@@ -221,8 +221,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
 		});
 
 		test.concurrent('フォローしているユーザーの他人の投稿のリノートが含まれる', async () => {
@@ -237,8 +237,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('[withRenotes: false] フォローしているユーザーの他人の投稿のリノートが含まれない', async () => {
@@ -255,8 +255,8 @@ describe('Timelines', () => {
 				withRenotes: false,
 			}, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('[withRenotes: false] フォローしているユーザーの他人の投稿の引用が含まれる', async () => {
@@ -273,8 +273,8 @@ describe('Timelines', () => {
 				withRenotes: false,
 			}, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーの他人への visibility: specified なノートが含まれない', async () => {
@@ -288,7 +288,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーが行ったミュートしているユーザーのリノートが含まれない', async () => {
@@ -304,8 +304,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーが行ったミュートしているユーザーの投稿への返信が含まれない', async () => {
@@ -322,8 +322,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('フォローしているリモートユーザーのノートが含まれる', async () => {
@@ -338,7 +338,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('フォローしているリモートユーザーの visibility: home なノートが含まれる', async () => {
@@ -353,7 +353,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withFiles: true] フォローしているユーザーのファイル付きノートのみ含まれる', async () => {
@@ -374,10 +374,10 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100, withFiles: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote2.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote2.id), false);
 		}, 1000 * 10);
 
 		test.concurrent('フォローしているユーザーのチャンネル投稿が含まれない', async () => {
@@ -392,7 +392,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('自分の visibility: specified なノートが含まれる', async () => {
@@ -404,8 +404,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === aliceNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === aliceNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('フォローしているユーザーの自身を visibleUserIds に指定した visibility: specified なノートが含まれる', async () => {
@@ -419,8 +419,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('フォローしていないユーザーの自身を visibleUserIds に指定した visibility: specified なノートが含まれない', async () => {
@@ -432,7 +432,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーの自身を visibleUserIds に指定していない visibility: specified なノートが含まれない', async () => {
@@ -446,7 +446,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしていないユーザーからの visibility: specified なノートに返信したときの自身のノートが含まれる', async () => {
@@ -459,8 +459,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === aliceNote.id).text, 'ok');
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === aliceNote.id)?.text, 'ok');
 		});
 
 		/* TODO
@@ -474,8 +474,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'ok');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id).text, 'ok');
 		});
 		*/
 
@@ -490,7 +490,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 	});
 
@@ -505,8 +505,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('他人の他人への返信が含まれない', async () => {
@@ -519,8 +519,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
 		});
 
 		test.concurrent('他人のその人自身への返信が含まれる', async () => {
@@ -533,8 +533,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		});
 
 		test.concurrent('チャンネル投稿が含まれない', async () => {
@@ -547,7 +547,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('リモートユーザーのノートが含まれない', async () => {
@@ -559,7 +559,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		// 含まれても良いと思うけど実装が面倒なので含まれない
@@ -575,8 +575,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('ミュートしているユーザーのノートが含まれない', async () => {
@@ -591,8 +591,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーが行ったミュートしているユーザーのリノートが含まれない', async () => {
@@ -608,8 +608,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でフォローしているユーザーが行ったミュートしているユーザーの投稿への返信が含まれない', async () => {
@@ -626,8 +626,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), false);
 		});
 
 		test.concurrent('withReplies: false でフォローしているユーザーからの自分への返信が含まれる', async () => {
@@ -642,8 +642,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withReplies: true] 他人の他人への返信が含まれる', async () => {
@@ -656,7 +656,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withFiles: true] ファイル付きノートのみ含まれる', async () => {
@@ -670,8 +670,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100, withFiles: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		}, 1000 * 10);
 	});
 
@@ -685,7 +685,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('ローカルユーザーの visibility: home なノートが含まれない', async () => {
@@ -697,7 +697,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしているローカルユーザーの visibility: home なノートが含まれる', async () => {
@@ -711,7 +711,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('withReplies: false でフォローしているユーザーからの自分への返信が含まれる', async () => {
@@ -726,8 +726,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('他人の他人への返信が含まれない', async () => {
@@ -740,8 +740,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === carolNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === carolNote.id), true);
 		});
 
 		test.concurrent('リモートユーザーのノートが含まれない', async () => {
@@ -753,7 +753,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/local-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしているリモートユーザーのノートが含まれる', async () => {
@@ -768,7 +768,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('フォローしているリモートユーザーの visibility: home なノートが含まれる', async () => {
@@ -783,7 +783,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100 }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withReplies: true] 他人の他人への返信が含まれる', async () => {
@@ -796,7 +796,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withFiles: true] ファイル付きノートのみ含まれる', async () => {
@@ -810,8 +810,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/hybrid-timeline', { limit: 100, withFiles: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		}, 1000 * 10);
 	});
 
@@ -828,7 +828,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('リスインしているフォローしていないユーザーの visibility: home なノートが含まれる', async () => {
@@ -843,7 +843,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('リスインしているフォローしていないユーザーの visibility: followers なノートが含まれない', async () => {
@@ -858,7 +858,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('リスインしているフォローしていないユーザーの他人への返信が含まれない', async () => {
@@ -874,7 +874,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('リスインしているフォローしていないユーザーのユーザー自身への返信が含まれる', async () => {
@@ -890,8 +890,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		});
 
 		test.concurrent('withReplies: false でリスインしているフォローしていないユーザーからの自分への返信が含まれる', async () => {
@@ -908,7 +908,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('withReplies: false でリスインしているフォローしていないユーザーの他人への返信が含まれない', async () => {
@@ -925,7 +925,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('withReplies: true でリスインしているフォローしていないユーザーの他人への返信が含まれる', async () => {
@@ -942,7 +942,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('リスインしているフォローしているユーザーの visibility: home なノートが含まれる', async () => {
@@ -958,7 +958,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('リスインしているフォローしているユーザーの visibility: followers なノートが含まれる', async () => {
@@ -974,8 +974,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('リスインしている自分の visibility: followers なノートが含まれる', async () => {
@@ -990,8 +990,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === aliceNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === aliceNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('リスインしているユーザーのチャンネルノートが含まれない', async () => {
@@ -1007,7 +1007,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('[withFiles: true] リスインしているユーザーのファイル付きノートのみ含まれる', async () => {
@@ -1023,8 +1023,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id, withFiles: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		}, 1000 * 10);
 
 		test.concurrent('リスインしているユーザーの自身宛ての visibility: specified なノートが含まれる', async () => {
@@ -1039,8 +1039,8 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('リスインしているユーザーの自身宛てではない visibility: specified なノートが含まれない', async () => {
@@ -1056,7 +1056,7 @@ describe('Timelines', () => {
 
 			const res = await api('notes/user-list-timeline', { listId: list.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 	});
 
@@ -1070,7 +1070,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('フォローしていないユーザーの visibility: followers なノートが含まれない', async () => {
@@ -1082,7 +1082,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('フォローしているユーザーの visibility: followers なノートが含まれる', async () => {
@@ -1096,8 +1096,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === bobNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('自身の visibility: followers なノートが含まれる', async () => {
@@ -1109,8 +1109,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: alice.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
-			assert.strictEqual(res.body.find((note: any) => note.id === aliceNote.id).text, 'hi');
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.find(note => note.id === aliceNote.id)?.text, 'hi');
 		});
 
 		test.concurrent('チャンネル投稿が含まれない', async () => {
@@ -1123,7 +1123,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('[withReplies: false] 他人への返信が含まれない', async () => {
@@ -1137,8 +1137,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), false);
 		});
 
 		test.concurrent('[withReplies: true] 他人への返信が含まれる', async () => {
@@ -1152,8 +1152,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		});
 
 		test.concurrent('[withReplies: true] 他人への visibility: specified な返信が含まれない', async () => {
@@ -1167,8 +1167,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), false);
 		});
 
 		test.concurrent('[withFiles: true] ファイル付きノートのみ含まれる', async () => {
@@ -1182,8 +1182,8 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withFiles: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), false);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
 		}, 1000 * 10);
 
 		test.concurrent('[withChannelNotes: true] チャンネル投稿が含まれる', async () => {
@@ -1196,7 +1196,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withChannelNotes: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('[withChannelNotes: true] 他人が取得した場合センシティブチャンネル投稿が含まれない', async () => {
@@ -1209,7 +1209,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withChannelNotes: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('[withChannelNotes: true] 自分が取得した場合センシティブチャンネル投稿が含まれる', async () => {
@@ -1222,7 +1222,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withChannelNotes: true }, bob);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), true);
 		});
 
 		test.concurrent('ミュートしているユーザーに関連する投稿が含まれない', async () => {
@@ -1237,7 +1237,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		test.concurrent('ミュートしていても userId に指定したユーザーの投稿が含まれる', async () => {
@@ -1253,9 +1253,9 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote3.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote1.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote2.id), true);
+			assert.strictEqual(res.body.some(note => note.id === bobNote3.id), true);
 		});
 
 		test.concurrent('自身の visibility: specified なノートが含まれる', async () => {
@@ -1267,7 +1267,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: alice.id, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === aliceNote.id), true);
+			assert.strictEqual(res.body.some(note => note.id === aliceNote.id), true);
 		});
 
 		test.concurrent('visibleUserIds に指定されてない visibility: specified なノートが含まれない', async () => {
@@ -1279,7 +1279,7 @@ describe('Timelines', () => {
 
 			const res = await api('users/notes', { userId: bob.id, withReplies: true }, alice);
 
-			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
+			assert.strictEqual(res.body.some(note => note.id === bobNote.id), false);
 		});
 
 		/** @see https://github.com/misskey-dev/misskey/issues/14000 */
diff --git a/packages/backend/test/unit/ApMfmService.ts b/packages/backend/test/unit/ApMfmService.ts
index 79cb81f5c..e81a321c9 100644
--- a/packages/backend/test/unit/ApMfmService.ts
+++ b/packages/backend/test/unit/ApMfmService.ts
@@ -23,10 +23,10 @@ describe('ApMfmService', () => {
 
 	describe('getNoteHtml', () => {
 		test('Do not provide _misskey_content for simple text', () => {
-			const note: MiNote = {
+			const note = {
 				text: 'テキスト #タグ @mention 🍊 :emoji: https://example.com',
 				mentionedRemoteUsers: '[]',
-			} as any;
+			};
 
 			const { content, noMisskeyContent } = apMfmService.getNoteHtml(note);
 
@@ -35,10 +35,10 @@ describe('ApMfmService', () => {
 		});
 
 		test('Provide _misskey_content for MFM', () => {
-			const note: MiNote = {
+			const note = {
 				text: '$[tada foo]',
 				mentionedRemoteUsers: '[]',
-			} as any;
+			};
 
 			const { content, noMisskeyContent } = apMfmService.getNoteHtml(note);
 
diff --git a/packages/backend/test/unit/FileInfoService.ts b/packages/backend/test/unit/FileInfoService.ts
index aa9b34b70..29bd03a20 100644
--- a/packages/backend/test/unit/FileInfoService.ts
+++ b/packages/backend/test/unit/FileInfoService.ts
@@ -12,7 +12,7 @@ import { ModuleMocker } from 'jest-mock';
 import { Test } from '@nestjs/testing';
 import { afterAll, beforeAll, describe, test } from '@jest/globals';
 import { GlobalModule } from '@/GlobalModule.js';
-import { FileInfoService } from '@/core/FileInfoService.js';
+import { FileInfo, FileInfoService } from '@/core/FileInfoService.js';
 //import { DI } from '@/di-symbols.js';
 import { AiService } from '@/core/AiService.js';
 import { LoggerService } from '@/core/LoggerService.js';
@@ -28,6 +28,15 @@ const moduleMocker = new ModuleMocker(global);
 describe('FileInfoService', () => {
 	let app: TestingModule;
 	let fileInfoService: FileInfoService;
+	const strip = (fileInfo: FileInfo): Omit<Partial<FileInfo>, 'warnings' | 'blurhash' | 'sensitive' | 'porn'> => {
+		const fi: Partial<FileInfo> = fileInfo;
+		delete fi.warnings;
+		delete fi.sensitive;
+		delete fi.blurhash;
+		delete fi.porn;
+		
+		return fi;
+	}
 
 	beforeAll(async () => {
 		app = await Test.createTestingModule({
@@ -63,11 +72,7 @@ describe('FileInfoService', () => {
 
 	test('Empty file', async () => {
 		const path = `${resources}/emptyfile`;
-		const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-		delete info.warnings;
-		delete info.blurhash;
-		delete info.sensitive;
-		delete info.porn;
+		const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 		assert.deepStrictEqual(info, {
 			size: 0,
 			md5: 'd41d8cd98f00b204e9800998ecf8427e',
@@ -84,11 +89,7 @@ describe('FileInfoService', () => {
 	describe('IMAGE', () => {
 		test('Generic JPEG', async () => {
 			const path = `${resources}/192.jpg`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 5131,
 				md5: '8c9ed0677dd2b8f9f7472c3af247e5e3',
@@ -104,11 +105,7 @@ describe('FileInfoService', () => {
 
 		test('Generic APNG', async () => {
 			const path = `${resources}/anime.png`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 1868,
 				md5: '08189c607bea3b952704676bb3c979e0',
@@ -124,11 +121,7 @@ describe('FileInfoService', () => {
 
 		test('Generic AGIF', async () => {
 			const path = `${resources}/anime.gif`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 2248,
 				md5: '32c47a11555675d9267aee1a86571e7e',
@@ -144,11 +137,7 @@ describe('FileInfoService', () => {
 
 		test('PNG with alpha', async () => {
 			const path = `${resources}/with-alpha.png`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 3772,
 				md5: 'f73535c3e1e27508885b69b10cf6e991',
@@ -164,11 +153,7 @@ describe('FileInfoService', () => {
 
 		test('Generic SVG', async () => {
 			const path = `${resources}/image.svg`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 505,
 				md5: 'b6f52b4b021e7b92cdd04509c7267965',
@@ -185,11 +170,7 @@ describe('FileInfoService', () => {
 		test('SVG with XML definition', async () => {
 			// https://github.com/misskey-dev/misskey/issues/4413
 			const path = `${resources}/with-xml-def.svg`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 544,
 				md5: '4b7a346cde9ccbeb267e812567e33397',
@@ -205,11 +186,7 @@ describe('FileInfoService', () => {
 
 		test('Dimension limit', async () => {
 			const path = `${resources}/25000x25000.png`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 75933,
 				md5: '268c5dde99e17cf8fe09f1ab3f97df56',
@@ -225,11 +202,7 @@ describe('FileInfoService', () => {
 
 		test('Rotate JPEG', async () => {
 			const path = `${resources}/rotate.jpg`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			assert.deepStrictEqual(info, {
 				size: 12624,
 				md5: '68d5b2d8d1d1acbbce99203e3ec3857e',
@@ -247,11 +220,7 @@ describe('FileInfoService', () => {
 	describe('AUDIO', () => {
 		test('MP3', async () => {
 			const path = `${resources}/kick_gaba7.mp3`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
@@ -267,11 +236,7 @@ describe('FileInfoService', () => {
 
 		test('WAV', async () => {
 			const path = `${resources}/kick_gaba7.wav`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
@@ -287,11 +252,7 @@ describe('FileInfoService', () => {
 
 		test('AAC', async () => {
 			const path = `${resources}/kick_gaba7.aac`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
@@ -307,11 +268,7 @@ describe('FileInfoService', () => {
 
 		test('FLAC', async () => {
 			const path = `${resources}/kick_gaba7.flac`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
@@ -327,11 +284,7 @@ describe('FileInfoService', () => {
 
 		test('MPEG-4 AUDIO (M4A)', async () => {
 			const path = `${resources}/kick_gaba7.m4a`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
@@ -347,11 +300,7 @@ describe('FileInfoService', () => {
 
 		test('WEBM AUDIO', async () => {
 			const path = `${resources}/kick_gaba7.webm`;
-			const info = await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }) as any;
-			delete info.warnings;
-			delete info.blurhash;
-			delete info.sensitive;
-			delete info.porn;
+			const info = strip(await fileInfoService.getFileInfo(path, { skipSensitiveDetection: true }));
 			delete info.width;
 			delete info.height;
 			delete info.orientation;
diff --git a/packages/backend/test/utils.ts b/packages/backend/test/utils.ts
index 06c3f8260..e70befeeb 100644
--- a/packages/backend/test/utils.ts
+++ b/packages/backend/test/utils.ts
@@ -18,6 +18,7 @@ import { entities } from '../src/postgres.js';
 import { loadConfig } from '../src/config.js';
 import type * as misskey from 'misskey-js';
 import { type Response } from 'node-fetch';
+import { ApiError } from "@/server/api/error.js";
 
 export { server as startServer, jobQueue as startJobQueue } from '@/boot/common.js';
 
@@ -48,27 +49,28 @@ export const successfulApiCall = async <E extends keyof misskey.Endpoints, P ext
 	const res = await api(endpoint, parameters, user);
 	const status = assertion.status ?? (res.body == null ? 204 : 200);
 	assert.strictEqual(res.status, status, inspect(res.body, { depth: 5, colors: true }));
-	return res.body;
+
+	return res.body as misskey.api.SwitchCaseResponseType<E, P>;
 };
 
-export const failedApiCall = async <T, E extends keyof misskey.Endpoints, P extends misskey.Endpoints[E]['req']>(request: ApiRequest<E, P>, assertion: {
+export const failedApiCall = async <E extends keyof misskey.Endpoints, P extends misskey.Endpoints[E]['req']>(request: ApiRequest<E, P>, assertion: {
 	status: number,
 	code: string,
 	id: string
-}): Promise<T> => {
+}): Promise<void> => {
 	const { endpoint, parameters, user } = request;
 	const { status, code, id } = assertion;
 	const res = await api(endpoint, parameters, user);
 	assert.strictEqual(res.status, status, inspect(res.body));
-	assert.strictEqual(res.body.error.code, code, inspect(res.body));
-	assert.strictEqual(res.body.error.id, id, inspect(res.body));
-	return res.body;
+	assert.ok(res.body);
+	assert.strictEqual(castAsError(res.body as any).error.code, code, inspect(res.body));
+	assert.strictEqual(castAsError(res.body as any).error.id, id, inspect(res.body));
 };
 
-export const api = async <E extends keyof misskey.Endpoints>(path: E, params: misskey.Endpoints[E]['req'], me?: UserToken): Promise<{
+export const api = async <E extends keyof misskey.Endpoints, P extends misskey.Endpoints[E]['req']>(path: E, params: P, me?: UserToken): Promise<{
 	status: number,
 	headers: Headers,
-	body: any
+	body: misskey.api.SwitchCaseResponseType<E, P>
 }> => {
 	const bodyAuth: Record<string, string> = {};
 	const headers: Record<string, string> = {
@@ -89,13 +91,14 @@ export const api = async <E extends keyof misskey.Endpoints>(path: E, params: mi
 	});
 
 	const body = res.headers.get('content-type') === 'application/json; charset=utf-8'
-		? await res.json()
+		? await res.json() as misskey.api.SwitchCaseResponseType<E, P>
 		: null;
 
 	return {
 		status: res.status,
 		headers: res.headers,
-		body,
+		// FIXME: removing this non-null assertion: requires better typing around empty response.
+		body: body!,
 	};
 };
 
@@ -141,7 +144,8 @@ export const post = async (user: UserToken, params: misskey.Endpoints['notes/cre
 
 	const res = await api('notes/create', q, user);
 
-	return res.body ? res.body.createdNote : null;
+	// FIXME: the return type should reflect this fact.
+	return (res.body ? res.body.createdNote : null)!;
 };
 
 export const createAppToken = async (user: UserToken, permissions: (typeof misskey.permissions)[number][]) => {
@@ -635,3 +639,9 @@ export async function sendEnvResetRequest() {
 		throw new Error('server env update failed.');
 	}
 }
+
+// 与えられた値を強制的にエラーとみなす。この関数は型安全性を破壊するため、異常系のアサーション以外で用いられるべきではない。
+// FIXME(misskey-js): misskey-jsがエラー情報を公開するようになったらこの関数を廃止する
+export function castAsError(obj: Record<string, unknown>): { error: ApiError } {
+	return obj as { error: ApiError };
+}