Translate your Vite and React website using Intlayer | Internationalization (i18n)

import { Locales, type IntlayerConfig } from "intlayer";

const config: IntlayerConfig = {
  internationalization: {
    locales: [
      Locales.ENGLISH,
      Locales.FRENCH,
      Locales.SPANISH,
      // Your other locales
    ],
    defaultLocale: Locales.ENGLISH,
  },
};

export default config;

import { defineConfig } from "vite";
import react from "@vitejs/plugin-react-swc";
import { intlayer } from "vite-intlayer";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react(), intlayer()],
});

import { t, type Dictionary } from "intlayer";
import type { ReactNode } from "react";

const appContent = {
  key: "app",
  content: {
    viteLogo: t({
      "en-GB": "Vite logo",
      en: "Vite logo",
      fr: "Logo Vite",
      es: "Logo Vite",
    }),
    reactLogo: t({
      "en-GB": "React logo",
      en: "React logo",
      fr: "Logo React",
      es: "Logo React",
    }),

    title: "Vite + React",

    count: t({
      "en-GB": "count is ",
      en: "count is ",
      fr: "le compte est ",
      es: "el recuento es ",
    }),

    edit: t<ReactNode>({
      "en-GB": (
        <>
          Edit <code>src/App.tsx</code> and save to test HMR
        </>
      ),
      en: (
        <>
          Edit <code>src/App.tsx</code> and save to test HMR
        </>
      ),
      fr: (
        <>
          Éditez <code>src/App.tsx</code> et enregistrez pour tester HMR
        </>
      ),
      es: (
        <>
          Edita <code>src/App.tsx</code> y guarda para probar HMR
        </>
      ),
    }),

    readTheDocs: t({
      "en-GB": "Click on the Vite and React logos to learn more",
      en: "Click on the Vite and React logos to learn more",
      fr: "Cliquez sur les logos Vite et React pour en savoir plus",
      es: "Haga clic en los logotipos de Vite y React para obtener más información",
    }),
  },
} satisfies Dictionary;

export default appContent;

import { useState, type FC } from "react";
import reactLogo from "./assets/react.svg";
import viteLogo from "/vite.svg";
import "./App.css";
import { IntlayerProvider, useIntlayer } from "react-intlayer";

const AppContent: FC = () => {
  const [count, setCount] = useState(0);
  const content = useIntlayer("app");

  return (
    <>
      <div>
        <a href="https://vitejs.dev" target="_blank">
          <img src={viteLogo} className="logo" alt={content.viteLogo.value} />
        </a>
        <a href="https://react.dev" target="_blank">
          <img
            src={reactLogo}
            className="logo react"
            alt={content.reactLogo.value}
          />
        </a>
      </div>
      <h1>{content.title}</h1>
      <div className="card">
        <button onClick={() => setCount((count) => count + 1)}>
          {content.count}
          {count}
        </button>
        <p>{content.edit}</p>
      </div>
      <p className="read-the-docs">{content.readTheDocs}</p>
    </>
  );
};

const App: FC = () => (
  <IntlayerProvider>
    <AppContent />
  </IntlayerProvider>
);

export default App;

import type { FC } from "react";
import { Locales } from "intlayer";
import { useLocale } from "react-intlayer";

const LocaleSwitcher: FC = () => {
  const { setLocale } = useLocale();

  return (
    <button onClick={() => setLocale(Locales.English)}>
      Change Language to English
    </button>
  );
};

// Importing necessary dependencies and functions
import { type Locales, configuration, getPathWithoutLocale } from "intlayer"; // Utility functions and types from 'intlayer'
import type { FC, PropsWithChildren } from "react"; // React types for functional components and props
import { IntlayerProvider } from "react-intlayer"; // Provider for internationalisation context
import {
  BrowserRouter,
  Routes,
  Route,
  Navigate,
  useLocation,
} from "react-router-dom"; // Router components for managing navigation

// Destructuring configuration from Intlayer
const { internationalization, middleware } = configuration;
const { locales, defaultLocale } = internationalization;

/**
 * A component that handles localisation and wraps children with the appropriate locale context.
 * It manages URL-based locale detection and validation.
 */
const AppLocalized: FC<PropsWithChildren<{ locale: Locales }>> = ({
  children,
  locale,
}) => {
  const { pathname, search } = useLocation(); // Get the current URL path

  // Determine the current locale, falling back to the default if not provided
  const currentLocale = locale ?? defaultLocale;

  // Remove the locale prefix from the path to construct a base path
  const pathWithoutLocale = getPathWithoutLocale(
    pathname // Current URL path
  );

  /**
   * If middleware.prefixDefault is true, the default locale should always be prefixed.
   */
  if (middleware.prefixDefault) {
    // Validate the locale
    if (!locale || !locales.includes(locale)) {
      // Redirect to the default locale with the updated path
      return (
        <Navigate
          to={`/${defaultLocale}/${pathWithoutLocale}${search}`}
          replace // Replace the current history entry with the new one
        />
      );
    }

    // Wrap children with the IntlayerProvider and set the current locale
    return (
      <IntlayerProvider locale={currentLocale}>{children}</IntlayerProvider>
    );
  } else {
    /**
     * When middleware.prefixDefault is false, the default locale is not prefixed.
     * Ensure that the current locale is valid and is not the default locale.
     */
    if (
      currentLocale.toString() !== defaultLocale.toString() &&
      !locales
        .filter(
          (locale) => locale.toString() !== defaultLocale.toString() // Exclude the default locale
        )
        .includes(currentLocale) // Check if the current locale is in the list of valid locales
    ) {
      // Redirect to the path without locale prefix
      return <Navigate to={`${pathWithoutLocale}${search}`} replace />;
    }

    // Wrap children with the IntlayerProvider and set the current locale
    return (
      <IntlayerProvider locale={currentLocale}>{children}</IntlayerProvider>
    );
  }
};

/**
 * A router component that sets up locale-specific routes.
 * It uses React Router to manage navigation and render localised components.
 */
export const LocaleRouter: FC<PropsWithChildren> = ({ children }) => (
  <BrowserRouter>
    <Routes>
      {locales
        .filter(
          (locale) => middleware.prefixDefault || locale !== defaultLocale
        )
        .map((locale) => (
          <Route
            // Route pattern to capture the locale (e.g., /en/, /fr/) and match all subsequent paths
            path={`/${locale}/*`}
            key={locale}
            element={<AppLocalized locale={locale}>{children}</AppLocalized>} // Wraps children with locale management
          />
        ))}

      {
        // If prefixing the default locale is disabled, render the children directly at the root path
        !middleware.prefixDefault && (
          <Route
            path="*"
            element={
              <AppLocalized locale={defaultLocale}>{children}</AppLocalized>
            } // Wraps children with locale management
          />
        )
      }
    </Routes>
  </BrowserRouter>
);

import { LocaleRouter } from "./components/LocaleRouter";
import type { FC } from "react";

// ... Your AppContent component

const App: FC = () => (
  <LocaleRouter>
    <AppContent />
  </LocaleRouter>
);

import { defineConfig } from "vite";
import react from "@vitejs/plugin-react-swc";
import { intlayer, intlayerProxy } from "vite-intlayer";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    intlayerProxy(), // should be placed first
    react(),
    intlayer(),
  ],
});

import { useLocation, useNavigate } from "react-router-dom";
import {
  Locales,
  getHTMLTextDir,
  getLocaleName,
  getLocalizedUrl,
} from "intlayer";
import { useLocale } from "react-intlayer";
import { type FC } from "react";

const LocaleSwitcher: FC = () => {
  const { pathname, search } = useLocation(); // Get the current URL path. Example: /fr/about?foo=bar
  const navigate = useNavigate();

  const { locale, availableLocales, setLocale } = useLocale({
    onLocaleChange: (locale) => {
      // Construct the URL with the updated locale
      // Example: /es/about?foo=bar
      const pathWithLocale = getLocalizedUrl(`${pathname}${search}`, locale);

      // Update the URL path
      navigate(pathWithLocale);
    },
  });

  return (
    <div>
      <button popoverTarget="localePopover">{getLocaleName(locale)}</button>
      <div id="localePopover" popover="auto">
        {availableLocales.map((localeItem) => (
          <a
            href={getLocalizedUrl(location.pathname, localeItem)}
            hrefLang={localeItem}
            aria-current={locale === localeItem ? "page" : undefined}
            onClick={(e) => {
              e.preventDefault();
              setLocale(localeItem);
            }}
            key={localeItem}
          >
            <span>
              {/* Locale - e.g. FR */}
              {localeItem}
            </span>
            <span>
              {/* Language in its own Locale - e.g. Français */}
              {getLocaleName(localeItem, locale)}
            </span>
            <span dir={getHTMLTextDir(localeItem)} lang={localeItem}>
              {/* Language in current Locale - e.g. Francés with current locale set to Locales.SPANISH */}
              {getLocaleName(localeItem)}
            </span>
            <span dir="ltr" lang={Locales.ENGLISH}>
              {/* Language in English - e.g. French */}
              {getLocaleName(localeItem, Locales.ENGLISH)}
            </span>
          </a>
        ))}
      </div>
    </div>
  );
};

import { useEffect } from "react";
import { useLocale } from "react-intlayer";
import { getHTMLTextDir } from "intlayer";

/**
 * Updates the HTML <html> element's `lang` and `dir` attributes based on the current locale.
 * - `lang`: Informs browsers and search engines of the page's language.
 * - `dir`: Ensures the correct reading order (e.g., 'ltr' for English, 'rtl' for Arabic).
 *
 * This dynamic update is essential for proper text rendering, accessibility, and SEO.
 */
export const useI18nHTMLAttributes = () => {
  const { locale } = useLocale();

  useEffect(() => {
    // Update the language attribute to the current locale.
    document.documentElement.lang = locale;

    // Set the text direction based on the current locale.
    document.documentElement.dir = getHTMLTextDir(locale);
  }, [locale]);
};

import type { FC } from "react";
import { IntlayerProvider, useIntlayer } from "react-intlayer";
import { useI18nHTMLAttributes } from "./hooks/useI18nHTMLAttributes";
import "./App.css";

const AppContent: FC = () => {
  // Apply the hook to update the <html> tag's lang and dir attributes based on the locale.
  useI18nHTMLAttributes();

  // ... Rest of your component
};

const App: FC = () => (
  <IntlayerProvider>
    <AppContent />
  </IntlayerProvider>
);

export default App;

import { getLocalizedUrl } from "intlayer";
import {
  forwardRef,
  type DetailedHTMLProps,
  type AnchorHTMLAttributes,
} from "react";
import { useLocale } from "react-intlayer";

export interface LinkProps extends DetailedHTMLProps<
  AnchorHTMLAttributes<HTMLAnchorElement>,
  HTMLAnchorElement
> {}

/**
 * Utility function to check whether a given URL is external.
 * If the URL starts with http:// or https://, it's considered external.
 */
export const checkIsExternalLink = (href?: string): boolean =>
  /^https?:\/\//.test(href ?? "");

/**
 * A custom Link component that adapts the href attribute based on the current locale.
 * For internal links, it uses `getLocalizedUrl` to prefix the URL with the locale (e.g., /fr/about).
 * This ensures that navigation stays within the same locale context.
 */
export const Link = forwardRef<HTMLAnchorElement, LinkProps>(
  ({ href, children, ...props }, ref) => {
    const { locale } = useLocale();
    const isExternalLink = checkIsExternalLink(href);

    // If the link is internal and a valid href is provided, get the localized URL.
    const hrefI18n =
      href && !isExternalLink ? getLocalizedUrl(href, locale) : href;

    return (
      <a href={hrefI18n} ref={ref} {...props}>
        {children}
      </a>
    );
  }
);

Link.displayName = "Link";