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language i18n added and tested for server and client side

This commit is contained in:
Berkay 2025-07-28 18:45:23 +03:00
parent e9cb161f90
commit cbe62d8734
43 changed files with 2778 additions and 0 deletions
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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.*
.yarn/*
!.yarn/patches
!.yarn/plugins
!.yarn/releases
!.yarn/versions
# testing
/coverage
# next.js
/.next/
/out/
# production
/build
# misc
.DS_Store
*.pem
# debug
npm-debug.log*
yarn-debug.log*
yarn-error.log*
.pnpm-debug.log*
# env files (can opt-in for committing if needed)
.env*
# vercel
.vercel
# typescript
*.tsbuildinfo
next-env.d.ts

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This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
## Getting Started
First, run the development server:
```bash
npm run dev
# or
yarn dev
# or
pnpm dev
# or
bun dev
```
Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
## Learn More
To learn more about Next.js, take a look at the following resources:
- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
## Deploy on Vercel
The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.

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{
"Index": {
"title": "Welcome to the Application",
"description": "This is a sample application with internationalization support.",
"navigation": {
"title": "Navigation",
"home": "Home",
"about": "About",
"contact": "Contact"
},
"auth": {
"title": "Authentication",
"login": "Login",
"register": "Register"
}
},
"LocaleLayout": {
"title": "Next.js i18n Application"
}
}

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{
"Index": {
"title": "Uygulamaya Hoş Geldiniz",
"description": "Bu, uluslararasılaştırma desteği olan örnek bir uygulamadır.",
"navigation": {
"title": "Navigasyon",
"home": "Ana Sayfa",
"about": "Hakkında",
"contact": "İletişim"
},
"auth": {
"title": "Kimlik Doğrulama",
"login": "Giriş Yap",
"register": "Kayıt Ol"
}
},
"LocaleLayout": {
"title": "Next.js i18n Uygulaması"
}
}

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import createMiddleware from "next-intl/middleware";
import { routing } from "@/i18n/routing";
export default createMiddleware({
// A list of all locales that are supported
locales: routing.locales,
// Used when no locale matches
defaultLocale: routing.defaultLocale,
// Locale detection strategies
localeDetection: true,
// Uncomment to use domains for language-specific subdomains
// domains: [
// {
// domain: 'example.com',
// defaultLocale: 'en'
// },
// {
// domain: 'example.fr',
// defaultLocale: 'fr'
// }
// ]
});
export const config = {
// Match all pathnames except for
// - API routes
// - Static files
// - _next internal paths
matcher: ["/((?!api|_next|.*\\..*).*)"],
};

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import createNextIntlPlugin from 'next-intl/plugin';
const withNextIntl = createNextIntlPlugin('./src/i18n/messages.ts');
/** @type {import('next').NextConfig} */
const nextConfig = {};
export default withNextIntl(nextConfig);

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import createNextIntlPlugin from "next-intl/plugin";
const withNextIntl = createNextIntlPlugin("./src/i18n/request.ts");
/** @type {import('next').NextConfig} */
const nextConfig = {
reactStrictMode: true,
};
export default withNextIntl(nextConfig);

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{
"name": "frontend",
"version": "0.1.0",
"private": true,
"scripts": {
"dev": "next dev",
"build": "next build",
"start": "next start",
"lint": "next lint"
},
"dependencies": {
"clsx": "^2.1.1",
"next": "15.4.4",
"next-intl": "^4.3.4",
"react": "19.1.0",
"react-dom": "19.1.0"
},
"devDependencies": {
"@tailwindcss/postcss": "^4",
"@types/node": "^20",
"@types/react": "^19",
"@types/react-dom": "^19",
"tailwindcss": "^4",
"typescript": "^5"
}
}

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const config = {
plugins: ["@tailwindcss/postcss"],
};
export default config;

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import { ReactNode } from 'react';
export default function AuthLayout({ children }: { children: ReactNode }) {
return <>{children}</>;
}

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export default function SelectPage() {
return <div></div>;
}

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export default function DashboardPage() {
return <div></div>;
}

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import { ReactNode } from 'react';
export default function ProtectedLayout({ children }: { children: ReactNode }) {
return <>{children}</>;
}

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'use client';
import { useTranslations } from 'next-intl';
export default function IndexPage() {
const t = useTranslations('Index');
return (
<div className="max-w-4xl mx-auto p-4">
<h1 className="text-2xl font-bold mb-4">{t('title')}</h1>
<p className="mb-4">{t('description')}</p>
<div className="my-8">
<h2 className="text-xl font-semibold mb-2">{t('navigation.title')}</h2>
<ul className="list-disc pl-5">
<li>{t('navigation.home')}</li>
<li>{t('navigation.about')}</li>
<li>{t('navigation.contact')}</li>
</ul>
</div>
<div className="my-8">
<h2 className="text-xl font-semibold mb-2">{t('auth.title')}</h2>
<div className="flex gap-2">
<button className="px-4 py-2 bg-blue-500 text-white rounded">
{t('auth.login')}
</button>
<button className="px-4 py-2 bg-green-500 text-white rounded">
{t('auth.register')}
</button>
</div>
</div>
</div>
);
}

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// Server Component
import { getTranslations } from 'next-intl/server';
import { Link } from '@/i18n/navigation';
import { Locale } from '@/i18n/locales';
import LocaleSwitcherServer from '@/components/LocaleSwitcherServer';
// Define the props type to get the locale parameter
type Props = {
params: Promise<{ locale: string }>;
};
export default async function HomePage({ params }: Props) {
// Get the locale from params
const { locale } = await params;
// Get translations with the correct locale
const t = await getTranslations({ locale: locale as Locale, namespace: 'Index' });
return (
<div className="max-w-4xl mx-auto p-4">
<h1 className="text-2xl font-bold mb-4">{t('title')}</h1>
<p className="mb-4">{t('description')}</p>
<div className="my-8">
<h2 className="text-xl font-semibold mb-2">{t('navigation.title')}</h2>
<ul className="list-disc pl-5 mb-4">
<li>
<Link href="/">{t('navigation.home')}</Link>
</li>
<li>
<Link href="/about">{t('navigation.about')}</Link>
</li>
<li>
<Link href="/contact">{t('navigation.contact')}</Link>
</li>
</ul>
<p>{t('navigation.current')} </p>
<LocaleSwitcherServer locale={locale} pathname="/home" />
</div>
</div>
);
}

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import { ReactNode } from 'react';
export default function PublicLayout({ children }: { children: ReactNode }) {
return <>{children}</>;
}

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import { ReactNode } from 'react';
import { Inter } from 'next/font/google';
import { notFound } from "next/navigation";
import { getTranslations } from "next-intl/server";
import { Locale, locales } from "@/i18n/locales";
import { routing } from "@/i18n/routing";
import { NextIntlClientProvider } from 'next-intl';
import '../globals.css';
const inter = Inter({ subsets: ["latin"] });
type Props = {
children: ReactNode;
params: Promise<{ locale: Locale }>;
};
export function generateStaticParams() {
return locales.map((locale) => ({ locale }));
}
export async function generateMetadata({ params }: Omit<Props, 'children'>) {
// Properly await params before accessing properties
const { locale } = await params;
const t = await getTranslations({ locale, namespace: 'LocaleLayout' });
return {
title: t('title')
};
}
export default async function LocaleLayout({ children, params }: Props) {
// Properly await params before accessing properties
const { locale } = await params;
// Validate that the incoming locale is valid
if (!locales.includes(locale as Locale)) {
notFound();
}
// Load messages for all child components
const messages = (await import(`@/i18n/${locale}.json`)).default;
// Enable static rendering
// Note: unstable_setRequestLocale is removed as it's causing TypeScript errors
return (
<html lang={locale}>
<body className={inter.className}>
<NextIntlClientProvider
locale={locale}
messages={messages}
timeZone="Europe/Istanbul" // Configure a default timezone for Turkey
>
{children}
</NextIntlClientProvider>
</body>
</html>
);
}

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'use server';
import HomePage from '@/app/home-page';
export default async function Home() {
return <HomePage />;
}

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@import "tailwindcss";
:root {
--background: #ffffff;
--foreground: #171717;
}
@theme inline {
--color-background: var(--background);
--color-foreground: var(--foreground);
--font-sans: var(--font-geist-sans);
--font-mono: var(--font-geist-mono);
}
@media (prefers-color-scheme: dark) {
:root {
--background: #0a0a0a;
--foreground: #ededed;
}
}
body {
background: var(--background);
color: var(--foreground);
font-family: Arial, Helvetica, sans-serif;
}

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'use client';
import { useTranslations } from 'next-intl';
import { useRouter } from '@/i18n/navigation';
import { useParams } from 'next/navigation';
import LocaleSwitcherClient from '@/components/LocaleSwitcherClient';
export default function HomePage() {
const t = useTranslations('Index');
const router = useRouter();
const params = useParams();
const handleNavigation = (path: string) => {
console.log('Navigating to /about');
router.push(path);
};
return (
<main>
<h1>{t('title')}</h1>
<p>{t('description')}</p>
<p>{t('navigation.title')} : {params.locale}</p>
<div className='flex flex-col gap-2'>
<LocaleSwitcherClient />
<button onClick={() => handleNavigation('/about')}>{t('navigation.about')}</button>
<button onClick={() => handleNavigation('/home')}>{t('navigation.home')}</button>
</div>
</main>
);
}

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'use client';
import { usePathname } from 'next-intl/client';
import { Link, useRouter } from '@/i18n/routing';
import { locales } from '@/i18n/locales';
export default function LanguageSwitcher() {
const pathname = usePathname();
const router = useRouter();
return (
<div>
<p>Select language:</p>
<ul>
{locales.map((locale) => (
<li key={locale}>
<Link href={pathname} locale={locale}>
{locale.toUpperCase()}
</Link>
</li>
))}
</ul>
</div>
);
}

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'use client';
import { useRouter, usePathname } from '@/i18n/navigation';
import { locales, Locale } from '@/i18n/locales';
import { useTranslations } from 'next-intl';
import { useParams } from 'next/navigation';
import { useState } from 'react';
type Props = {
className?: string;
};
/**
* Client Component for switching locales
* Uses the useRouter hook from next-intl/navigation
* Renders as a dropdown that excludes the current language
*/
export default function LocaleSwitcherClient({ className = '' }: Props) {
const router = useRouter();
const pathname = usePathname();
const params = useParams();
const currentLocale = params.locale as Locale;
const t = useTranslations('Index');
const [isOpen, setIsOpen] = useState(false);
// Filter out the current locale from the available options
const availableLocales = locales.filter(lang => lang !== currentLocale);
const handleLocaleChange = (newLocale: Locale) => {
// Navigate to the same path but with a different locale
router.push(pathname, { locale: newLocale });
setIsOpen(false);
};
return (
<div className={`relative inline-block ${className}`}>
<div>
<button
type="button"
className="inline-flex justify-between items-center w-24 rounded-md border border-gray-300 px-4 py-2 bg-white text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
onClick={() => setIsOpen(!isOpen)}
aria-expanded={isOpen}
aria-haspopup="true"
>
<span>{currentLocale.toUpperCase()}</span>
<svg className="-mr-1 ml-2 h-5 w-5" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
<path fillRule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clipRule="evenodd" />
</svg>
</button>
</div>
{isOpen && (
<div
className="origin-top-right mt-2 w-24 rounded-md shadow-lg bg-white ring-1 ring-black ring-opacity-5 focus:outline-none z-10"
role="menu"
aria-orientation="vertical"
tabIndex={-1}
>
<div className="py-1" role="none">
{availableLocales.map((lang) => (
<button
key={lang}
onClick={() => handleLocaleChange(lang)}
className="block w-full text-center px-4 py-2 text-sm text-gray-700 hover:bg-gray-100 hover:text-gray-900"
role="menuitem"
>
{lang.toUpperCase()}
</button>
))}
</div>
</div>
)}
</div>
);
}

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import { Link } from '@/i18n/navigation';
import { locales, Locale } from '@/i18n/locales';
import { getTranslations } from 'next-intl/server';
import { headers } from 'next/headers';
type Props = {
locale: string;
className?: string;
pathname?: string; // Optional pathname to navigate to
};
/**
* Server Component for switching locales
* Uses the Link component from next-intl/navigation
* Renders as a dropdown that excludes the current language
*/
export default async function LocaleSwitcherServer({ locale, className = '', pathname }: Props) {
const t = await getTranslations({ locale: locale as Locale, namespace: 'Index' });
// Use the provided pathname or default to the current route
let pathWithoutLocale = pathname || '/home';
// If we're on a locale-prefixed route like /en/home or /tr/about,
// extract just the path part without the locale prefix
if (pathWithoutLocale.startsWith(`/${locale}/`)) {
pathWithoutLocale = pathWithoutLocale.substring(locale.length + 1);
} else if (pathWithoutLocale.startsWith('/')) {
// If it already starts with /, keep it as is
} else {
// Ensure it starts with /
pathWithoutLocale = `/${pathWithoutLocale}`;
}
// Filter out the current locale from the available options
const availableLocales = locales.filter(lang => lang !== locale);
return (
<div className={`relative inline-block ${className}`}>
<div className="group">
<button type="button" className="inline-flex justify-between items-center w-24 rounded-md border border-gray-300 px-4 py-2 bg-white text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500">
<span>{locale.toUpperCase()}</span>
<svg className="-mr-1 ml-2 h-5 w-5" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
<path fillRule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clipRule="evenodd" />
</svg>
</button>
<div className="hidden group-hover:block mt-2 w-24 rounded-md shadow-lg bg-white ring-1 ring-black ring-opacity-5 focus:outline-none z-10">
<div className="py-1" role="menu" aria-orientation="vertical">
{availableLocales.map((lang) => (
<Link
key={lang}
href={pathWithoutLocale}
locale={lang}
className="block px-4 py-2 text-sm text-center text-gray-700 hover:bg-gray-100 hover:text-gray-900"
role="menuitem"
>
{lang.toUpperCase()}
</Link>
))}
</div>
</div>
</div>
</div>
);
}

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'use client';
import { useTranslations } from 'next-intl';
import { NextIntlClientProvider } from 'next-intl';
import { Locale } from '@/i18n/locales';
type NamespaceType = 'Index' | 'LocaleLayout';
interface TranslatedContentProps {
namespace: NamespaceType;
locale: Locale;
messages: any;
}
export default function TranslatedContent({ namespace, locale, messages }: TranslatedContentProps) {
return (
<NextIntlClientProvider
locale={locale}
messages={messages}
timeZone="Europe/Istanbul" // Configure a default timezone for Turkey
>
<TranslatedUI namespace={namespace} />
</NextIntlClientProvider>
);
}
function TranslatedUI({ namespace }: { namespace: NamespaceType }) {
const t = useTranslations(namespace);
return (
<main>
<h1>{t('title')}</h1>
<p>{t('description')}</p>
</main>
);
}

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import {getRequestConfig} from 'next-intl/server';
import {notFound} from 'next/navigation';
export const locales = ['en', 'tr'];
export const defaultLocale = 'tr';
export function isValidLocale(locale: string): boolean {
return locales.includes(locale);
}
export default getRequestConfig(async ({locale}) => {
// Validate that the locale is supported
if (!locale || !isValidLocale(locale)) {
notFound();
}
return {
messages: (await import(`../messages/${locale}.json`)).default,
locale: locale
};
});

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{
"Index": {
"title": "Hello world!",
"description": "This is a simple example",
"auth": {
"title": "Authentication",
"login": "Login",
"register": "Register"
},
"navigation": {
"title": "Navigation",
"home": "Home",
"about": "About",
"contact": "Contact",
"current": "Current Language"
}
},
"LocaleLayout": {
"title": "My Application"
}
}

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export * from "./routing";

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export const locales = ["en", "tr"] as const;
export type Locale = (typeof locales)[number];

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import { getRequestConfig } from "next-intl/server";
import { Locale, locales } from "./locales";
export default getRequestConfig(async ({ locale }) => {
// Handle the case where locale might be undefined
const safeLocale = locale && locales.includes(locale as Locale)
? locale
: "tr"; // Default to Turkish if locale is undefined or invalid
// Load messages for the locale
const messages = (await import(`./${safeLocale}.json`)).default;
// Return both locale and messages as required by RequestConfig
return {
locale: safeLocale as Locale,
messages,
// You can add other config options here if needed
// timeZone: 'Europe/Istanbul',
// now: new Date(),
};
});

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import {createNavigation} from 'next-intl/navigation';
import {routing} from './routing';
// Lightweight wrappers around Next.js' navigation
// APIs that consider the routing configuration
export const {Link, redirect, usePathname, useRouter, getPathname} =
createNavigation(routing);

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"use client";
import { locales, Locale } from "./locales";
import {
usePathname as useNextPathname,
useRouter as useNextRouter,
} from "next/navigation";
import { useParams } from "next/navigation";
import React from "react";
import Link from "next/link";
// Enhanced Link component for i18n support
export const LocaleLink: React.FC<{
href: string;
locale?: Locale;
children: React.ReactNode;
}> = ({ href, locale, children }) => {
const params = useParams();
const currentLocale =
locale || (params?.locale as Locale) || routing.defaultLocale;
// Construct the localized path
const path = getLocalizedPath(href, currentLocale);
// Use a different approach without JSX since this is a .ts file
return React.createElement(
Link,
{ href: `/${currentLocale}${path}` },
children
);
};
// Helper to get localized path
function getLocalizedPath(path: string, locale: Locale): string {
// First check if this is a direct path in our pathnames
const pathnameConfig = pathnames[path];
if (typeof pathnameConfig === "string") {
return pathnameConfig;
}
if (
pathnameConfig &&
typeof pathnameConfig === "object" &&
locale in pathnameConfig
) {
return (pathnameConfig as Record<Locale, string>)[locale];
}
for (const [key, value] of Object.entries(pathnames)) {
if (typeof value === "object") {
const localizedValues = value as Record<Locale, string>;
if (localizedValues[locale] === path) {
return key;
}
}
}
return path;
}
// Redirect function for server-side redirects
export const redirect = (url: string) => {
// This is a placeholder for server components
// In real implementation, you would use Next.js redirect
if (typeof window !== "undefined") {
window.location.href = url;
}
};
// Enhanced usePathname for i18n
export const usePathname = () => {
const nextPathname = useNextPathname();
const params = useParams();
const locale = params?.locale as Locale;
// Remove locale prefix from pathname
if (locale && nextPathname.startsWith(`/${locale}`)) {
return nextPathname.substring(`/${locale}`.length) || "/";
}
return nextPathname;
};
// Enhanced useRouter for i18n
export const useRouter = () => {
const router = useNextRouter();
const params = useParams();
const locale = (params?.locale as Locale) || routing.defaultLocale;
return {
// Preserve original router methods
...router,
// Enhanced push method with locale handling
push: (url: string) => {
// Keep the original URL path and just add the locale prefix
const fullPath = `/${locale}${url}`;
console.log(`Navigating to: ${fullPath}`);
// Use window.location for more reliable navigation in client components
if (typeof window !== "undefined") {
window.location.href = fullPath;
return;
}
// Fallback to Next.js router
router.push(fullPath);
},
// Enhanced replace method with locale handling
replace: (url: string) => {
// Keep the original URL path and just add the locale prefix
const fullPath = `/${locale}${url}`;
console.log(`Replacing with: ${fullPath}`);
// Use window.location for more reliable navigation in client components
if (typeof window !== "undefined") {
window.location.replace(fullPath);
return;
}
// Fallback to Next.js router
router.replace(fullPath);
},
};
};
// Define routes mapping
export const pathnames: Record<string, string | Record<Locale, string>> = {
"/": "/",
"/about": "/about",
};
// Export routing configuration
export const routing = {
locales,
defaultLocale: "tr" as const,
};

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{
"Index": {
"title": "Merhaba dünya!",
"description": "Bu basit bir örnektir",
"auth": {
"title": "Kimlik Doğrulama",
"login": "Giriş Yap",
"register": "Kayıt Ol"
},
"navigation": {
"title": "Navigasyon",
"home": "Ana Sayfa",
"about": "Hakkında",
"contact": "İletişim",
"current": "Mevcut Dili"
}
},
"LocaleLayout": {
"title": "Uygulamam"
}
}

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{
"title": "Welcome Ninja"
}

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{
"title": "Hoşgeldiniz Ninja"
}

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ServicesFrontEnd/frontend/src/types/next-intl.d.ts vendored Normal file
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import { routing } from "@/i18n/routing";
import enMessages from "@/i18n/en.json";
declare module "next-intl" {
interface AppConfig {
// Type-safe locale
Locale: (typeof routing.locales)[number];
// Type-safe messages
Messages: typeof enMessages;
}
}

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{
"compilerOptions": {
"target": "ES2017",
"lib": ["dom", "dom.iterable", "esnext"],
"allowJs": true,
"skipLibCheck": true,
"strict": true,
"noEmit": true,
"esModuleInterop": true,
"module": "esnext",
"moduleResolution": "bundler",
"resolveJsonModule": true,
"isolatedModules": true,
"jsx": "preserve",
"incremental": true,
"plugins": [
{
"name": "next"
}
],
"paths": {
"@/*": ["./src/*"]
}
},
"include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
"exclude": ["node_modules"]
}