diff --git a/packages/backend/src/boot/master.ts b/packages/backend/src/boot/master.ts
index 6b1fce48c..4e5327641 100644
--- a/packages/backend/src/boot/master.ts
+++ b/packages/backend/src/boot/master.ts
@@ -140,7 +140,7 @@ async function connectDb(): Promise<void> {
 }
 
 async function spawnWorkers(clusterLimits: Required<Config['clusterLimits']>): Promise<void> {
-	const modes = ['web', 'queue'];
+	const modes = ['web' as const, 'queue' as const];
 	const cpus = os.cpus().length;
 	for (const mode of modes.filter(mode => clusterLimits[mode] > cpus)) {
 		bootLogger.warn(`configuration warning: cluster limit for ${mode} exceeds number of cores (${cpus})`);
diff --git a/packages/backend/src/misc/check-hit-antenna.ts b/packages/backend/src/misc/check-hit-antenna.ts
index e563d749e..7091dcd07 100644
--- a/packages/backend/src/misc/check-hit-antenna.ts
+++ b/packages/backend/src/misc/check-hit-antenna.ts
@@ -22,7 +22,7 @@ export async function checkHitAntenna(antenna: Antenna, note: (Note | Packed<'No
 	if (note.visibility === 'specified') return false;
 
 	// skip if the antenna creator is blocked by the note author
-	const blockings = await blockingCache.fetch(noteUser.id);
+	const blockings = (await blockingCache.fetch(noteUser.id)) ?? [];
 	if (blockings.some(blocking => blocking === antenna.userId)) return false;
 
 	if (note.visibility === 'followers') {
diff --git a/packages/backend/src/misc/fetch-meta.ts b/packages/backend/src/misc/fetch-meta.ts
index edd6265a8..ab8c81eef 100644
--- a/packages/backend/src/misc/fetch-meta.ts
+++ b/packages/backend/src/misc/fetch-meta.ts
@@ -57,5 +57,5 @@ export async function fetchMeta(noCache = false): Promise<Meta> {
 
 	await getMeta();
 
-	return cache;
+	return cache!;
 }
diff --git a/packages/backend/src/models/repositories/drive-file.ts b/packages/backend/src/models/repositories/drive-file.ts
index 788949d6d..f75207134 100644
--- a/packages/backend/src/models/repositories/drive-file.ts
+++ b/packages/backend/src/models/repositories/drive-file.ts
@@ -126,7 +126,7 @@ export const DriveFileRepository = db.getRepository(DriveFile).extend({
 		const file = typeof src === 'object' ? src : await this.findOneBy({ id: src });
 		if (file == null) return null;
 
-		return await this.pack(file);
+		return await this.pack(file, opts);
 	},
 
 	async packMany(