diff --git a/packages/frontend-shared/@types/global.d.ts b/packages/frontend-shared/@types/global.d.ts
index 1025d1bedb..4b8d679e75 100644
--- a/packages/frontend-shared/@types/global.d.ts
+++ b/packages/frontend-shared/@types/global.d.ts
@@ -3,6 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 type FIXME = any;
 
 declare const _LANGS_: string[][];
@@ -19,5 +20,6 @@ declare const _LANGS_FULL_: string[][];
 
 // TagCanvas
 interface Window {
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	TagCanvas: any;
 }
diff --git a/packages/frontend-shared/js/config.ts b/packages/frontend-shared/js/config.ts
index 0506c3b70d..ae1dcae10b 100644
--- a/packages/frontend-shared/js/config.ts
+++ b/packages/frontend-shared/js/config.ts
@@ -5,6 +5,7 @@
 
 import type { Locale } from '../../../locales/index.js';
 
+// eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
 const address = new URL(document.querySelector<HTMLMetaElement>('meta[property="instance_url"]')?.content || location.href);
 const siteName = document.querySelector<HTMLMetaElement>('meta[property="og:site_name"]')?.content;
 
@@ -18,7 +19,7 @@ export const langs = _LANGS_;
 const preParseLocale = localStorage.getItem('locale');
 export let locale: Locale = preParseLocale ? JSON.parse(preParseLocale) : null;
 export const version = _VERSION_;
-export const instanceName = siteName === 'Misskey' || siteName == null ? host : siteName;
+export const instanceName = (siteName === 'Misskey' || siteName == null) ? host : siteName;
 export const ui = localStorage.getItem('ui');
 export const debug = localStorage.getItem('debug') === 'true';
 
diff --git a/packages/frontend-shared/js/emoji-base.ts b/packages/frontend-shared/js/emoji-base.ts
index a01540a3e4..5fbbc4ea84 100644
--- a/packages/frontend-shared/js/emoji-base.ts
+++ b/packages/frontend-shared/js/emoji-base.ts
@@ -19,7 +19,7 @@ export function char2fluentEmojiFilePath(char: string): string {
 	// Fluent Emojiは国旗非対応 https://github.com/microsoft/fluentui-emoji/issues/25
 	if (codes[0]?.startsWith('1f1')) return char2twemojiFilePath(char);
 	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
-	codes = codes.filter(x => x && x.length);
-	const fileName = codes.map(x => x!.padStart(4, '0')).join('-');
+	codes = codes.filter(x => x != null && x.length > 0);
+	const fileName = (codes as string[]).map(x => x.padStart(4, '0')).join('-');
 	return `${fluentEmojiPngBase}/${fileName}.png`;
 }
diff --git a/packages/frontend-shared/js/intl-const.ts b/packages/frontend-shared/js/intl-const.ts
index 385f59ec39..33b65b6e9b 100644
--- a/packages/frontend-shared/js/intl-const.ts
+++ b/packages/frontend-shared/js/intl-const.ts
@@ -5,6 +5,7 @@
 
 import { lang } from '@@/js/config.js';
 
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 export const versatileLang = (lang ?? 'ja-JP').replace('ja-KS', 'ja-JP');
 
 let _dateTimeFormat: Intl.DateTimeFormat;
diff --git a/packages/frontend-shared/js/worker-multi-dispatch.ts b/packages/frontend-shared/js/worker-multi-dispatch.ts
index 6c21cc49f6..5d393ed1ed 100644
--- a/packages/frontend-shared/js/worker-multi-dispatch.ts
+++ b/packages/frontend-shared/js/worker-multi-dispatch.ts
@@ -3,16 +3,18 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-function defaultUseWorkerNumber(prev: number, totalWorkers: number) {
+function defaultUseWorkerNumber(prev: number) {
 	return prev + 1;
 }
 
+type WorkerNumberGetter = (prev: number, totalWorkers: number) => number;
+
 export class WorkerMultiDispatch<POST = unknown, RETURN = unknown> {
 	private symbol = Symbol('WorkerMultiDispatch');
 	private workers: Worker[] = [];
 	private terminated = false;
 	private prevWorkerNumber = 0;
-	private getUseWorkerNumber = defaultUseWorkerNumber;
+	private getUseWorkerNumber: WorkerNumberGetter;
 	private finalizationRegistry: FinalizationRegistry<symbol>;
 
 	constructor(workerConstructor: () => Worker, concurrency: number, getUseWorkerNumber = defaultUseWorkerNumber) {
@@ -29,7 +31,7 @@ export class WorkerMultiDispatch<POST = unknown, RETURN = unknown> {
 		if (_DEV_) console.log('WorkerMultiDispatch: Created', this);
 	}
 
-	public postMessage(message: POST, options?: Transferable[] | StructuredSerializeOptions, useWorkerNumber: typeof defaultUseWorkerNumber = this.getUseWorkerNumber) {
+	public postMessage(message: POST, options?: Transferable[] | StructuredSerializeOptions, useWorkerNumber: WorkerNumberGetter = this.getUseWorkerNumber) {
 		let workerNumber = useWorkerNumber(this.prevWorkerNumber, this.workers.length);
 		workerNumber = Math.abs(Math.round(workerNumber)) % this.workers.length;
 		if (_DEV_) console.log('WorkerMultiDispatch: Posting message to worker', workerNumber, useWorkerNumber);
@@ -46,12 +48,14 @@ export class WorkerMultiDispatch<POST = unknown, RETURN = unknown> {
 		return workerNumber;
 	}
 
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	public addListener(callback: (this: Worker, ev: MessageEvent<RETURN>) => any, options?: boolean | AddEventListenerOptions) {
 		this.workers.forEach(worker => {
 			worker.addEventListener('message', callback, options);
 		});
 	}
 
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
 	public removeListener(callback: (this: Worker, ev: MessageEvent<RETURN>) => any, options?: boolean | AddEventListenerOptions) {
 		this.workers.forEach(worker => {
 			worker.removeEventListener('message', callback, options);