From 805ba01c842a7b24c6cb9688ccac3cdb8831b37e Mon Sep 17 00:00:00 2001
From: Jevin <jevin98@163.com>
Date: Fri, 15 May 2026 14:30:07 +0800
Subject: [PATCH] fix: default locale to English

---
 entrypoints/devtools-panel/lang.ts |  4 ++--
 tests/unit/lang.test.ts            | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)
 create mode 100644 tests/unit/lang.test.ts

diff --git a/entrypoints/devtools-panel/lang.ts b/entrypoints/devtools-panel/lang.ts
index d813439..006f49c 100644
--- a/entrypoints/devtools-panel/lang.ts
+++ b/entrypoints/devtools-panel/lang.ts
@@ -44,8 +44,8 @@ const messages = {
 
 export const activeLocale = ref<Locale>('en')
 
-export function initializeLocale(value: string | null, fallback = browser.i18n.getUILanguage()) {
-  activeLocale.value = resolveLocale(value ?? fallback)
+export function initializeLocale(value: string | null) {
+  activeLocale.value = resolveLocale(value)
 }
 
 export function setLocale(value: Locale) {
diff --git a/tests/unit/lang.test.ts b/tests/unit/lang.test.ts
new file mode 100644
index 0000000..2424188
--- /dev/null
+++ b/tests/unit/lang.test.ts
@@ -0,0 +1,19 @@
+import { describe, expect, it, vi } from 'vitest'
+import { fakeBrowser } from 'wxt/testing'
+import { activeLocale, initializeLocale } from '../../entrypoints/devtools-panel/lang'
+
+describe('language initialization', () => {
+  it('defaults to English when the user has not selected a language', () => {
+    vi.spyOn(fakeBrowser.i18n, 'getUILanguage').mockReturnValue('zh-CN')
+
+    initializeLocale(null)
+
+    expect(activeLocale.value).toBe('en')
+  })
+
+  it('uses the saved language when the user has selected one', () => {
+    initializeLocale('zh_CN')
+
+    expect(activeLocale.value).toBe('zh_CN')
+  })
+})