diff --git a/packages/backend/src/boot/index.ts b/packages/backend/src/boot/index.ts
index c3d059225..0cfeca1d3 100644
--- a/packages/backend/src/boot/index.ts
+++ b/packages/backend/src/boot/index.ts
@@ -17,7 +17,7 @@ const ev = new Xev();
 /**
  * Init process
  */
-export default async function() {
+export default async function(): void {
 	process.title = `Misskey (${cluster.isPrimary ? 'master' : 'worker'})`;
 
 	if (cluster.isPrimary || envOption.disableClustering) {
@@ -68,7 +68,9 @@ if (!envOption.quiet) {
 process.on('uncaughtException', err => {
 	try {
 		logger.error(err);
-	} catch { }
+	} catch {
+		// if that fails too there is nothing we can do
+	}
 });
 
 // Dying away...
diff --git a/packages/backend/src/boot/master.ts b/packages/backend/src/boot/master.ts
index 0c936e72b..fa3f31215 100644
--- a/packages/backend/src/boot/master.ts
+++ b/packages/backend/src/boot/master.ts
@@ -10,8 +10,8 @@ import semver from 'semver';
 import Logger from '@/services/logger.js';
 import loadConfig from '@/config/load.js';
 import { Config } from '@/config/types.js';
-import { envOption } from '../env.js';
 import { showMachineInfo } from '@/misc/show-machine-info.js';
+import { envOption } from '../env.js';
 import { db, initDb } from '../db/postgre.js';
 
 const _filename = fileURLToPath(import.meta.url);
@@ -24,7 +24,7 @@ const bootLogger = logger.createSubLogger('boot', 'magenta', false);
 
 const themeColor = chalk.hex('#86b300');
 
-function greet() {
+function greet(): void {
 	if (!envOption.quiet) {
 		//#region Misskey logo
 		const v = `v${meta.version}`;
@@ -49,7 +49,7 @@ function greet() {
 /**
  * Init master process
  */
-export async function masterMain() {
+export async function masterMain(): void {
 	let config!: Config;
 
 	// initialize app
@@ -142,7 +142,7 @@ async function connectDb(): Promise<void> {
 	}
 }
 
-async function spawnWorkers(limit: number = 1) {
+async function spawnWorkers(limit = 1): void {
 	const workers = Math.min(limit, os.cpus().length);
 	bootLogger.info(`Starting ${workers} worker${workers === 1 ? '' : 's'}...`);
 	await Promise.all([...Array(workers)].map(spawnWorker));