Getting Started Internationalizing (i18n) with Intlayer and React Create App

import { t, type DeclarationContent } from "intlayer";import React, { type ReactNode } from "react";const appContent = {  key: "app",  content: {    getStarted: t<ReactNode>({      en: (        <>          Edit <code>src/App.tsx</code> and save to reload        </>      ),      fr: (        <>          Éditez <code>src/App.tsx</code> et enregistrez pour recharger        </>      ),      es: (        <>          Edita <code>src/App.tsx</code> y guarda para recargar        </>      ),    }),    reactLink: {      href: "https://reactjs.org",      content: t({        en: "Learn React",        fr: "Apprendre React",        es: "Aprender React",      }),    },  },} satisfies DeclarationContent;export default appContent;

import logo from "./logo.svg";import "./App.css";import type { FC } from "react";import { IntlayerProvider, useIntlayer } from "react-intlayer";const AppContent: FC = () => {  const content = useIntlayer("app");  return (    <div className="App">      <img src={logo} className="App-logo" alt="logo" />      {content.getStarted}      <a        className="App-link"        href={content.reactLink.href.value}        target="_blank"        rel="noopener noreferrer"      >        {content.reactLink.content}      </a>    </div>  );};const App: FC = () => (  <IntlayerProvider>    <AppContent />  </IntlayerProvider>);export default App;

import { Locales } from "intlayer";import { useLocale } from "react-intlayer";const LocaleSwitcher = () => {  const { setLocale } = useLocale();  return (    <button onClick={() => setLocale(Locales.English)}>      Change Language to English    </button>  );};

// Importing necessary dependencies and functionsimport { Locales, getConfiguration, getPathWithoutLocale } from "intlayer"; // Utility functions and types from 'intlayer'import type { FC, PropsWithChildren } from "react"; // React types for functional components and propsimport { IntlayerProvider } from "react-intlayer"; // Provider for internationalization contextimport {  BrowserRouter,  Routes,  Route,  useParams,  Navigate,  useLocation,} from "react-router-dom"; // Router components for managing navigation// Destructuring configuration from Intlayerconst { internationalization, middleware } = getConfiguration();const { locales, defaultLocale } = internationalization;/** * A component that handles localization and wraps children with the appropriate locale context. * It manages URL-based locale detection and validation. */const AppLocalized: FC<PropsWithChildren> = ({ children }) => {  const path = useLocation().pathname; // Get the current URL path  const { locale } = useParams<{ locale: Locales }>(); // Extract the locale parameter from the URL  // 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(    path // 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}`}          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 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} 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 localized components. */export const LocaleRouter: FC<PropsWithChildren> = ({ children }) => (  <BrowserRouter>    <Routes>      <Route        // Route pattern to capture the locale (e.g., /en/, /fr/) and match all subsequent paths        path="/:locale/*"        element={<AppLocalized>{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>{children}</AppLocalized>} // Wraps children with locale management          />        )      }    </Routes>  </BrowserRouter>);

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 location = useLocation(); // Get the current URL path. Example: /fr/about  const navigate = useNavigate();  const changeUrl = (locale: Locales) => {    // Construct the URL with the updated locale    // Example: /es/about with the locale set to Spanish    const pathWithLocale = getLocalizedUrl(location.pathname, locale);    // Update the URL path    navigate(pathWithLocale);  };  const { locale, availableLocales, setLocale } = useLocale({    onLocaleChange: changeUrl,  });  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 { 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;