@inlang/paraglide-js/dist/compiler/runtime/extract-locale-from-navigator.js

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import { toLocale } from "./check-locale.js";
/**
 * Negotiates a preferred language from navigator.languages.
 *
 * Use the function on the client to extract the locale
 * from the navigator.languages array.
 *
 * @example
 *   const locale = extractLocaleFromNavigator();
 *
 * @returns {Locale | undefined}
 */
export function extractLocaleFromNavigator() {
    if (!navigator?.languages?.length) {
        return undefined;
    }
    const languages = navigator.languages.map((lang) => ({
        fullTag: lang,
        baseTag: lang.split("-")[0],
    }));
    for (const lang of languages) {
        const fullLocale = toLocale(lang.fullTag);
        if (fullLocale) {
            return fullLocale;
        }
        const baseLocale = toLocale(lang.baseTag);
        if (baseLocale) {
            return baseLocale;
        }
    }
    return undefined;
}
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