elk/plugins/setup-i18n.ts

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import type { VueI18n } from 'vue-i18n'
import type { LocaleObject } from 'vue-i18n-routing'
import { DEFAULT_LANGUAGE } from '~/constants'
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export default defineNuxtPlugin(async (nuxt) => {
const i18n = nuxt.vueApp.config.globalProperties.$i18n as VueI18n
const { setLocale, locales } = i18n
const supportLanguages = (locales as LocaleObject[]).map(locale => locale.code)
const userSettings = useUserSettings()
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if (process.server) {
const headers = useRequestHeaders()
let lang = userSettings.value.language
if (!lang || !supportLanguages.includes(lang)) {
// first visit
if (headers['accept-language']) {
// detect language from header
const userLanguages = headers['accept-language'].split(',').map(lang => lang.split(';')[0].toLowerCase())
lang = matchLanguages(supportLanguages, userLanguages) || DEFAULT_LANGUAGE
}
else {
lang = DEFAULT_LANGUAGE
}
}
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if (lang !== i18n.locale)
await setLocale(userSettings.value.language)
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return
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}
// could be null if browser don't accept cookie
if (!userSettings.value.language || !supportLanguages.includes(userSettings.value.language))
userSettings.value.language = DEFAULT_LANGUAGE
watch(() => userSettings.value.language, (lang) => {
if (lang !== i18n.locale)
setLocale(lang)
}, { immediate: true })
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})