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TypeScript

import type { App } from 'vue'
import type { I18nOptions, Locale } from 'vue-i18n'
import { createI18n } from 'vue-i18n'
import { storeToRefs } from 'pinia'
import { localesMap } from './config'
const loadedLocalePool: string[] = []
// eslint-disable-next-line import/no-mutable-exports
export let i18n: ReturnType<typeof createI18n>
async function createI18nOptions(): Promise<I18nOptions> {
// saved locale
const localeStore = useLocaleStore()
const { fallback, availableLocales, getLocale } = storeToRefs(localeStore)
const locale = getLocale.value
return {
legacy: false,
locale,
fallbackLocale: unref(fallback),
messages: {},
availableLocales: unref(availableLocales),
sync: true,
silentTranslationWarn: false,
missingWarn: false,
silentFallbackWarn: true,
}
}
export function setI18nLanguage(lang: Locale) {
i18n.global.locale = lang
if (typeof document !== 'undefined') {
document.querySelector('html')?.setAttribute('lang', lang)
}
return lang
}
export async function loadLanguageAsync(lang: string): Promise<Locale> {
// If the same language
if (i18n.global.locale === lang) {
return setI18nLanguage(lang)
}
// If the language was already loaded
if (loadedLocalePool.includes(lang)) {
return setI18nLanguage(lang)
}
// If the language hasn't been loaded yet
const messages = await localesMap[lang]()
i18n.global.setLocaleMessage(lang, messages.default)
loadedLocalePool.push(lang)
return setI18nLanguage(lang)
}
export async function setupI18n(app: App) {
const options = await createI18nOptions()
i18n = createI18n(options)
await loadLanguageAsync(options.locale!)
app.use(i18n)
}