Iniziare con l'internazionalizzazione (i18n) con Intlayer e Tanstack Start

import { createFileRoute, Navigate, Outlet } from "@tanstack/react-router";import { IntlayerProvider, useLocale } from "react-intlayer";import { useI18nHTMLAttributes } from "@/hooks/useI18nHTMLAttributes";export const Route = createFileRoute("/{-$locale}")({  component: LayoutComponent,});function LayoutComponent() {  const { defaultLocale } = useLocale();  const { locale } = Route.useParams();  return (    <IntlayerProvider locale={defaultLocale}>      <Outlet />    </IntlayerProvider>  );}

import type { Dictionary } from "intlayer";import { t } from "intlayer";const appContent = {  content: {    links: {      about: t({        it: "Informazioni",        en: "About",        es: "Acerca de",        fr: "À propos",      }),      home: t({        it: "Home",        en: "Home",        es: "Inicio",        fr: "Accueil",      }),    },    meta: {      description: t({        it: "Questo è un esempio di utilizzo di Intlayer con TanStack Router",        en: "This is an example of using Intlayer with TanStack Router",        es: "Este es un ejemplo de uso de Intlayer con TanStack Router",        fr: "Ceci est un exemple d'utilisation d'Intlayer avec TanStack Router",      }),    },    title: t({      it: "Benvenuto in Intlayer + TanStack Router",      en: "Welcome to Intlayer + TanStack Router",      es: "Bienvenido a Intlayer + TanStack Router",      fr: "Bienvenue à Intlayer + TanStack Router",    }),  },  key: "app",} satisfies Dictionary;export default appContent;      fr: "Bienvenue à Intlayer + TanStack Router",    }),  },  key: "app",} satisfies Dictionary;export default appContent;

import type { FC } from "react";import { Link, type LinkComponentProps } from "@tanstack/react-router";import { useLocale } from "react-intlayer";export const LOCALE_ROUTE = "{-$locale}" as const;// Utilità principaleexport type RemoveLocaleParam<T> = T extends string  ? RemoveLocaleFromString<T>  : T;export type To = RemoveLocaleParam<LinkComponentProps["to"]>;type CollapseDoubleSlashes<S extends string> =  S extends `${infer H}//${infer T}` ? CollapseDoubleSlashes<`${H}/${T}`> : S;type LocalizedLinkProps = {  to?: To;} & Omit<LinkComponentProps, "to">;// Helpertype RemoveAll<  S extends string,  Sub extends string,> = S extends `${infer H}${Sub}${infer T}` ? RemoveAll<`${H}${T}`, Sub> : S;type RemoveLocaleFromString<S extends string> = CollapseDoubleSlashes<  RemoveAll<S, typeof LOCALE_ROUTE>>;export const LocalizedLink: FC<LocalizedLinkProps> = (props) => {  const { locale } = useLocale();  return (    <Link      {...props}      params={{        locale,        ...(typeof props?.params === "object" ? props?.params : {}),      }}      to={`/${LOCALE_ROUTE}${props.to}` as LinkComponentProps["to"]}    />  );};

import { useLocale } from "react-intlayer";import { useNavigate } from "@tanstack/react-router";import { LOCALE_ROUTE } from "@/components/localized-link";import type { FileRouteTypes } from "@/routeTree.gen";export const useLocalizedNavigate = () => {  const navigate = useNavigate();  const { locale } = useLocale();  type StripLocalePrefix<T extends string> = T extends    | `/${typeof LOCALE_ROUTE}`    | `/${typeof LOCALE_ROUTE}/`    ? "/"    : T extends `/${typeof LOCALE_ROUTE}/${infer Rest}`      ? `/${Rest}`      : never;  type LocalizedTo = StripLocalePrefix<FileRouteTypes["to"]>;  interface LocalizedNavigate {    (to: LocalizedTo): ReturnType<typeof navigate>;    (      opts: { to: LocalizedTo } & Record<string, unknown>    ): ReturnType<typeof navigate>;  }  const localizedNavigate: LocalizedNavigate = (args: any) => {    if (typeof args === "string") {      return navigate({ to: `/${LOCALE_ROUTE}${args}`, params: { locale } });    }    const { to, ...rest } = args;    const localedTo = `/${LOCALE_ROUTE}${to}` as any;    return navigate({ to: localedTo, params: { locale, ...rest } as any });  };  return localizedNavigate;};

import { createFileRoute } from "@tanstack/react-router";import { getIntlayer } from "intlayer";import { useIntlayer } from "react-intlayer";import LocaleSwitcher from "@/components/locale-switcher";import { LocalizedLink } from "@/components/localized-link";import { useLocalizedNavigate } from "@/hooks/useLocalizedNavigate";export const Route = createFileRoute("/{-$locale}/")({  component: RouteComponent,  head: ({ params }) => {    const { locale } = params;    const metaContent = getIntlayer("app", locale);    return {      meta: [        { title: metaContent.title },        { content: metaContent.meta.description, name: "description" },      ],    };  },});function RouteComponent() {  const content = useIntlayer("app");  const navigate = useLocalizedNavigate();  return (    <div>      <div>        {content.title}        <LocaleSwitcher />        <div>          <LocalizedLink to="/">{content.links.home}</LocalizedLink>          <LocalizedLink to="/about">{content.links.about}</LocalizedLink>        </div>        <div>          <button onClick={() => navigate({ to: "/" })}>            {content.links.home}          </button>          <button onClick={() => navigate({ to: "/about" })}>            {content.links.about}          </button>        </div>      </div>    </div>  );}

import type { FC } from "react";import { useLocation } from "@tanstack/react-router";import { getHTMLTextDir, getLocaleName, getPathWithoutLocale } from "intlayer";import { setLocaleCookie, useIntlayer, useLocale } from "react-intlayer";import { LocalizedLink, To } from "./localized-link";export const LocaleSwitcher: FC = () => {  const { localeSwitcherLabel } = useIntlayer("locale-switcher");  const { pathname } = useLocation();  const { availableLocales, locale } = useLocale();  const pathWithoutLocale = getPathWithoutLocale(pathname);  return (    <ol>      {availableLocales.map((localeEl) => (        <li key={localeEl}>          <LocalizedLink            aria-current={localeEl === locale ? "page" : undefined}            aria-label={`${localeSwitcherLabel.value} ${getLocaleName(localeEl)}`}            onClick={() => setLocaleCookie(localeEl)}            params={{ locale: localeEl }}            to={pathWithoutLocale as To}          >            <span>              {/* Lingua - es. FR */}              {localeItem}            </span>            <span>              {/* Lingua nella sua stessa lingua - es. Français */}              {getLocaleName(localeItem, locale)}            </span>            <span dir={getHTMLTextDir(localeItem)} lang={localeItem}>              {/* Lingua nella lingua corrente - es. Francés con la lingua corrente impostata su Locales.SPANISH */}              {getLocaleName(localeItem)}            </span>            <span dir="ltr" lang={Locales.ENGLISH}>              {/* Lingua in inglese - es. French */}              {getLocaleName(localeItem, Locales.ENGLISH)}            </span>          </LocalizedLink>        </li>      ))}    </ol>  );};

// src/hooks/useI18nHTMLAttributes.tsximport { getHTMLTextDir } from "intlayer";import { useEffect } from "react";import { useLocale } from "react-intlayer";export const useI18nHTMLAttributes = () => {  const { locale } = useLocale();  useEffect(() => {    document.documentElement.lang = locale;    document.documentElement.dir = getHTMLTextDir(locale);  }, [locale]);};

import { createFileRoute, Navigate, Outlet } from "@tanstack/react-router";import { IntlayerProvider, useLocale } from "react-intlayer";import { useI18nHTMLAttributes } from "@/hooks/useI18nHTMLAttributes"; // importa il hookexport const Route = createFileRoute("/{-$locale}")({  component: LayoutComponent,});function LayoutComponent() {  useI18nHTMLAttributes(); // aggiungi questa riga  const { defaultLocale } = useLocale();  const { locale } = Route.useParams();  return (    <IntlayerProvider locale={locale ?? defaultLocale}>      <Outlet />    </IntlayerProvider>  );}