nuxt-i18n-micro/dist/runtime/server/utils/locale-detector.js

Nuxt I18n Micro is a lightweight, high-performance internationalization module for Nuxt, designed to handle multi-language support with minimal overhead, fast build times, and efficient runtime performance.

import { getEnabledLocaleCodes } from "@i18n-micro/utils/active-locales";
import { withoutAppBaseURL } from "@i18n-micro/utils/app-path";
import { getLocaleCookieName } from "@i18n-micro/utils/cookie";
import { resolveServerLocale } from "@i18n-micro/utils/resolve-locale";
import { getCookie, getQuery, getRequestURL } from "h3";
import { useRuntimeConfig } from "#imports";
export const detectCurrentLocale = (event, config, defaultLocale) => {
  const { fallbackLocale, defaultLocale: configDefaultLocale, locales, localeCookie, autoDetectLanguage } = config;
  if (event.context.params?.locale) {
    return event.context.params.locale.toString();
  }
  const resolvedDefault = defaultLocale || configDefaultLocale || "en";
  const validLocales = getEnabledLocaleCodes(locales ?? []);
  const url = getRequestURL(event);
  const rawPath = url.pathname.split("?")[0]?.split("#")[0] ?? url.pathname;
  const cleanPath = withoutAppBaseURL(rawPath, useRuntimeConfig(event).app.baseURL);
  const pathSegments = cleanPath.split("/").filter(Boolean);
  const firstSegment = pathSegments[0] ?? "";
  const hasLocaleInUrl = Boolean(firstSegment && validLocales.includes(firstSegment));
  const queryLocale = getQuery(event)?.locale ? String(getQuery(event).locale) : null;
  const cookieName = getLocaleCookieName({ localeCookie });
  const cookieLocale = cookieName ? getCookie(event, cookieName) : null;
  const locale = resolveServerLocale({
    defaultLocale: resolvedDefault,
    validLocales,
    autoDetectLanguage,
    hasLocaleInUrl,
    urlLocale: firstSegment || null,
    queryLocale,
    cookieLocale,
    acceptLanguageHeader: event.headers.get("accept-language")
  });
  return locale || fallbackLocale || resolvedDefault;
};