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4 changes: 2 additions & 2 deletions entrypoints/devtools-panel/lang.ts
Original file line numberDiff line numberDiff line change
Expand Up@@ -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) {
Expand Down
19 changes: 19 additions & 0 deletions tests/unit/lang.test.ts
Original file line numberDiff line numberDiff line change
@@ -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')
})
})
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