diff --git a/packages/backend/src/server/web/HtmlTemplateService.ts b/packages/backend/src/server/web/HtmlTemplateService.ts
index 80c767d886..8ff985530d 100644
--- a/packages/backend/src/server/web/HtmlTemplateService.ts
+++ b/packages/backend/src/server/web/HtmlTemplateService.ts
@@ -6,7 +6,7 @@
 import { dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { promises as fsp } from 'node:fs';
-import { languages } from 'i18n';
+import { languages } from 'i18n/const';
 import { Injectable, Inject } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
diff --git a/packages/i18n/package.json b/packages/i18n/package.json
index d06e485da0..6ba41632e8 100644
--- a/packages/i18n/package.json
+++ b/packages/i18n/package.json
@@ -8,6 +8,10 @@
 		".": {
 			"types": "./built/index.d.ts",
 			"import": "./built/index.js"
+		},
+		"./const": {
+			"types": "./built/const.d.ts",
+			"import": "./built/const.js"
 		}
 	},
 	"scripts": {
diff --git a/packages/i18n/src/const.ts b/packages/i18n/src/const.ts
new file mode 100644
index 0000000000..bb690e7542
--- /dev/null
+++ b/packages/i18n/src/const.ts
@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const languages = [
+	'ar-SA',
+	'ca-ES',
+	'cs-CZ',
+	'da-DK',
+	'de-DE',
+	'en-US',
+	'es-ES',
+	'fr-FR',
+	'id-ID',
+	'it-IT',
+	'ja-JP',
+	'ja-KS',
+	'kab-KAB',
+	'kn-IN',
+	'ko-KR',
+	'nl-NL',
+	'no-NO',
+	'pl-PL',
+	'pt-PT',
+	'ru-RU',
+	'sk-SK',
+	'th-TH',
+	'tr-TR',
+	'ug-CN',
+	'uk-UA',
+	'vi-VN',
+	'zh-CN',
+	'zh-TW',
+] as const;
+
+export const primaries = {
+	'en': 'US',
+	'ja': 'JP',
+	'zh': 'CN',
+} as const satisfies Record<string, string>;
diff --git a/packages/i18n/src/index.ts b/packages/i18n/src/index.ts
index 77a4f42012..21d215159f 100644
--- a/packages/i18n/src/index.ts
+++ b/packages/i18n/src/index.ts
@@ -9,48 +9,12 @@
 
 import * as fs from 'node:fs';
 import * as yaml from 'js-yaml';
+import { languages, primaries } from './const.js';
 import type { Locale } from './autogen/locale.js';
 import type { ILocale, ParameterizedString } from './types.js';
 
-const languages = [
-	'ar-SA',
-	'ca-ES',
-	'cs-CZ',
-	'da-DK',
-	'de-DE',
-	'en-US',
-	'es-ES',
-	'fr-FR',
-	'id-ID',
-	'it-IT',
-	'ja-JP',
-	'ja-KS',
-	'kab-KAB',
-	'kn-IN',
-	'ko-KR',
-	'nl-NL',
-	'no-NO',
-	'pl-PL',
-	'pt-PT',
-	'ru-RU',
-	'sk-SK',
-	'th-TH',
-	'tr-TR',
-	'ug-CN',
-	'uk-UA',
-	'vi-VN',
-	'zh-CN',
-	'zh-TW',
-] as const;
-
 type Language = typeof languages[number];
 
-const primaries = {
-	'en': 'US',
-	'ja': 'JP',
-	'zh': 'CN',
-} as const satisfies Record<string, string>;
-
 type PrimaryLang = keyof typeof primaries;
 
 type Locales = Record<Language, ILocale>;