refactor(backend): `Array.prototype.filter`での非null確認では`isNotNull`関数を使うように (#13442)

* `Array.prototype.filter`での非null確認では`isNotNull`関数を使うように

* `{}` -> `NonNullable<unknown>`

3 files changed, 6 insertions, 3 deletions

diff --git a/packages/backend/src/server/api/endpoints/gallery/posts/create.ts b/packages/backend/src/server/api/endpoints/gallery/posts/create.ts
index 784ae5088f..b07cdf1ed9 100644
--- a/packages/backend/src/server/api/endpoints/gallery/posts/create.ts
+++ b/packages/backend/src/server/api/endpoints/gallery/posts/create.ts
@@ -12,6 +12,7 @@ import type { MiDriveFile } from '@/models/DriveFile.js';
 import { IdService } from '@/core/IdService.js';
 import { GalleryPostEntityService } from '@/core/entities/GalleryPostEntityService.js';
 import { DI } from '@/di-symbols.js';
+import { isNotNull } from '@/misc/is-not-null.js';
 
 export const meta = {
 	tags: ['gallery'],
@@ -69,7 +70,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					id: fileId,
 					userId: me.id,
 				}),
-			))).filter((file): file is MiDriveFile => file != null);
+			))).filter(isNotNull);
 
 			if (files.length === 0) {
 				throw new Error();
diff --git a/packages/backend/src/server/api/endpoints/gallery/posts/update.ts b/packages/backend/src/server/api/endpoints/gallery/posts/update.ts
index 8872b261dd..8bd83ff5ba 100644
--- a/packages/backend/src/server/api/endpoints/gallery/posts/update.ts
+++ b/packages/backend/src/server/api/endpoints/gallery/posts/update.ts
@@ -10,6 +10,7 @@ import type { DriveFilesRepository, GalleryPostsRepository } from '@/models/_.js
 import type { MiDriveFile } from '@/models/DriveFile.js';
 import { GalleryPostEntityService } from '@/core/entities/GalleryPostEntityService.js';
 import { DI } from '@/di-symbols.js';
+import { isNotNull } from '@/misc/is-not-null.js';
 
 export const meta = {
 	tags: ['gallery'],
@@ -67,7 +68,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					id: fileId,
 					userId: me.id,
 				}),
-			))).filter((file): file is MiDriveFile => file != null);
+			))).filter(isNotNull);
 
 			if (files.length === 0) {
 				throw new Error();
diff --git a/packages/backend/src/server/api/endpoints/pinned-users.ts b/packages/backend/src/server/api/endpoints/pinned-users.ts
index 1f4509764f..784766bcb5 100644
--- a/packages/backend/src/server/api/endpoints/pinned-users.ts
+++ b/packages/backend/src/server/api/endpoints/pinned-users.ts
@@ -12,6 +12,7 @@ import { Endpoint } from '@/server/api/endpoint-base.js';
 import { MetaService } from '@/core/MetaService.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { DI } from '@/di-symbols.js';
+import { isNotNull } from '@/misc/is-not-null.js';
 
 export const meta = {
 	tags: ['users'],
@@ -52,7 +53,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				host: acct.host ?? IsNull(),
 			})));
 
-			return await this.userEntityService.packMany(users.filter(x => x !== null) as MiUser[], me, { schema: 'UserDetailed' });
+			return await this.userEntityService.packMany(users.filter(isNotNull), me, { schema: 'UserDetailed' });
 		});
 	}
 }