declare let navigator: any; /** * Custom language detection, just returns the config property if any. */ export default { /** * Does not support caching. * * @returns {void} */ cacheUserLanguage: Function.prototype, /** * Looks the language up in the config. * * @returns {string} The default language if any. */ lookup() { let found = []; if (typeof navigator !== 'undefined') { if (navigator.languages) { // chrome only; not an array, so can't use .push.apply instead of iterating for (let i = 0; i < navigator.languages.length; i++) { found.push(navigator.languages[i]); } } if (navigator.userLanguage) { found.push(navigator.userLanguage); } if (navigator.language) { found.push(navigator.language); } } found = found.map(normalizeLanguage); return found.length > 0 ? found : undefined; }, /** * Name of the language detector. */ name: 'customNavigatorDetector' }; /** * Normalize language format. * * (en-US => enUS) * (en-gb => enGB) * (es-es => es). * * @param {string} language - Language. * @returns {string} The normalized language. */ function normalizeLanguage(language: string) { const [ lang, variant ] = language.replace('_', '-').split('-'); if (!variant || lang === variant) { return lang; } return lang + variant.toUpperCase(); }