IntlayerでTanstack Startを翻訳する | 国際化（i18n）

import { createFileRoute, 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={locale ?? defaultLocale}>      <Outlet />    </IntlayerProvider>  );}

import type { Dictionary } from "intlayer";import { t } from "intlayer";const appContent = {  content: {    links: {      about: t({        ja: "約",        en: "About",        es: "Acerca de",        fr: "À propos",      }),      home: t({        ja: "ホーム",        en: "Home",        es: "Inicio",        fr: "Accueil",      }),    },    meta: {      description: t({        ja: "これはIntlayerをTanStack Routerと一緒に使う例です",        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({      ja: "Intlayer + TanStack Routerへようこそ",      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;

import type { FC } from "react";import { Link, type LinkComponentProps } from "@tanstack/react-router";import { useLocale } from "react-intlayer";import { getPrefix } from "intlayer";export const LOCALE_ROUTE = "{-$locale}" as const;// メインユーティリティexport type RemoveLocaleParam<T> = T extends string  ? RemoveLocaleFromString<T>  : T;export type To = RemoveLocaleParam<LinkComponentProps["to"]>;type CollapseDoubleSlashes<S extends string> =  S extends `${infer H}//${infer T}` ? CollapseDoubleSlashes<`${H}/${T}`> : S;type LocalizedLinkProps = {  to?: To;} & Omit<LinkComponentProps, "to">;// ヘルパーtype RemoveAll<  S extends string,  Sub extends string,> = S extends `${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();  const { localePrefix } = getPrefix(locale);  return (    <Link      {...props}      params={{        locale: localePrefix,        ...(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}/`    ? "/" // ロケールプレフィックスのみの場合はルートに置き換え    : T extends `/${typeof LOCALE_ROUTE}/${infer Rest}`      ? `/${Rest}` // ロケールプレフィックスを除去したパス      : never;  type LocalizedTo = StripLocalePrefix<FileRouteTypes["to"]>;  interface LocalizedNavigate {    (to: LocalizedTo): ReturnType<typeof navigate>;    (      opts: { to: LocalizedTo } & Record<string, unknown>    ): ReturnType<typeof navigate>;  }  const localizedNavigate: LocalizedNavigate = (args: any) => {    if (typeof args === "string") {      return navigate({ to: `/${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,  getPrefix,  Locales,} from "intlayer";import { useLocale } from "react-intlayer";import { LocalizedLink, To } from "./localized-link";export const LocaleSwitcher: FC = () => {  const { pathname } = useLocation();  const { availableLocales, locale, setLocale } = useLocale();  const pathWithoutLocale = getPathWithoutLocale(pathname);  return (    <ol>      {availableLocales.map((localeEl) => (        <li key={localeEl}>          <LocalizedLink            aria-current={localeEl === locale ? "page" : undefined}            onClick={() => setLocale(localeEl)}            params={{ locale: getPrefix(localeEl).localePrefix }}          >            <span>              {/* ロケール - 例: FR */}              {localeEl}            </span>            <span>              {/* 自身のロケールでの言語名 - 例: Français */}              {getLocaleName(localeEl, locale)}            </span>            <span dir={getHTMLTextDir(localeEl)} lang={localeEl}>              {/* 現在のロケールでの言語名 - 例: Locales.SPANISHに設定された場合のFrancés */}              {getLocaleName(localeEl)}            </span>            <span dir="ltr" lang={Locales.ENGLISH}>              {/* 英語での言語名 - 例: French */}              {getLocaleName(localeEl, 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, Outlet } from "@tanstack/react-router";import { IntlayerProvider, useLocale } from "react-intlayer";import { useI18nHTMLAttributes } from "@/hooks/useI18nHTMLAttributes"; // フックをインポートexport const Route = createFileRoute("/{-$locale}")({  component: LayoutComponent,});function LayoutComponent() {  useI18nHTMLAttributes(); // この行を追加  const { defaultLocale } = useLocale();  const { locale } = Route.useParams();  return (    <IntlayerProvider locale={locale ?? defaultLocale}>      <Outlet />    </IntlayerProvider>  );}

import { createFileRoute } from "@tanstack/react-router";import { getIntlayer } from "intlayer";export const Route = createFileRoute("/{-$locale}/")({  component: RouteComponent,  head: ({ params }) => {    const { locale } = params;    const metaContent = getIntlayer("page-metadata", locale);    return {      meta: [        { title: metaContent.title },        { content: metaContent.description, name: "description" },      ],    };  },});

import { createServerFn } from "@tanstack/react-start";import {  getRequestHeader,  getRequestHeaders,} from "@tanstack/react-start/server";import { getCookie, getIntlayer, getLocale } from "intlayer";export const getLocaleServer = createServerFn().handler(async () => {  const locale = await getLocale({    // Get the cookie from the request (default: 'INTLAYER_LOCALE')    getCookie: (name) => {      const cookieString = getRequestHeader("cookie");      return getCookie(name, cookieString);    },    // Get the header from the request (default: 'x-intlayer-locale')    // Fallback using Accept-Language negotiation    getHeader: (name) => getRequestHeader(name),  });  // Retrieve some content using getIntlayer()  const content = getIntlayer("app", locale);  return { locale, content };});