4dkankan-components/docs/.vitepress/lang.js

;(() => {
    const supportedLangs = window.supportedLangs
    const cacheKey = 'preferred_lang'
    const defaultLang = 'zh-CN'
    // docs supported languages
    const langAlias = {
        en: 'en-US',
        fr: 'fr-FR',
        es: 'es-ES',
    }
    let userPreferredLang = localStorage.getItem(cacheKey) || navigator.language
    const language = langAlias[userPreferredLang] || (supportedLangs.includes(userPreferredLang) ? userPreferredLang : defaultLang)
    localStorage.setItem(cacheKey, language)
    userPreferredLang = language
    if (!location.pathname.startsWith(`/${userPreferredLang}`)) {
        const toPath = [`/${userPreferredLang}`].concat(location.pathname.split('/').slice(2)).join('/')
        location.pathname = toPath.endsWith('.html') || toPath.endsWith('/') ? toPath : toPath.concat('/')
    }
    if (navigator && navigator.serviceWorker.controller) {
        navigator.serviceWorker.controller.postMessage({
            type: 'LANG',
            lang: userPreferredLang,
        })
    }
})()