كيفية بناء مكون مبدل اللغة في TanStack Start v1

export const locales = ["en", "fr", "es", "de"] as const;

export type Locale = (typeof locales)[number];

export const defaultLocale: Locale = "en";

import { defaultLocale, locales, type Locale } from "./locales";

export function getLocaleFromPathname(pathname: string): Locale {
  const segments = pathname.split("/").filter(Boolean);
  const firstSegment = segments[0];

  if (firstSegment && locales.includes(firstSegment as Locale)) {
    return firstSegment as Locale;
  }

  return defaultLocale;
}

import { defaultLocale, locales, type Locale } from "./locales";

export function getLocalizedPath(
  pathname: string,
  targetLocale: Locale,
): string {
  const segments = pathname.split("/").filter(Boolean);
  const firstSegment = segments[0];

  const hasLocalePrefix =
    firstSegment && locales.includes(firstSegment as Locale);

  if (hasLocalePrefix) {
    segments[0] = targetLocale;
  } else {
    segments.unshift(targetLocale);
  }

  return "/" + segments.join("/");
}

import { Link } from "@tanstack/react-router";
import { useLocation } from "@tanstack/react-router";
import { locales, type Locale } from "./locales";
import { getLocaleFromPathname, getLocalizedPath } from "./locale-helpers";

export function LanguageSwitcher() {
  const location = useLocation();
  const currentLocale = getLocaleFromPathname(location.pathname);

  return (
    <nav>
      <ul>
        {locales.map((locale) => {
          const isActive = locale === currentLocale;
          const localizedPath = getLocalizedPath(location.pathname, locale);

          return (
            <li key={locale}>
              <Link
                to={localizedPath}
                search={location.search}
                hash={location.hash}
                aria-current={isActive ? "page" : undefined}
              >
                {locale.toUpperCase()}
              </Link>
            </li>
          );
        })}
      </ul>
    </nav>
  );
}