feat(playground): formatter pages, Intl explorer, Settings, 404 (follow-up to #2084)

examples/example-app-router-patterns/.gitignore

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+/node_modules
+/.next/
+.DS_Store
+tsconfig.tsbuildinfo

examples/example-app-router-patterns/README.md

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+# example-app-router-patterns
+
+This example demonstrates various use cases and patterns for using `next-intl` with the App Router.
+
+## Deploy your own
+
+By deploying to [Vercel](https://vercel.com), you can check out the example in action. Note that you'll be prompted to create a new GitHub repository as part of this, allowing you to make subsequent changes.
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https://github.com/amannn/next-intl/tree/main/examples/example-app-router-patterns)

examples/example-app-router-patterns/eslint.config.mjs

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+import {dirname} from 'path';
+import {fileURLToPath} from 'url';
+import {FlatCompat} from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname
+});
+
+const eslintConfig = [
+  ...compat.extends('next/core-web-vitals', 'next/typescript'),
+  {
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/ban-ts-comment': 'off'
+    }
+  }
+];
+
+export default eslintConfig;

examples/example-app-router-patterns/next-env.d.ts

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+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+/// <reference path="./.next/types/routes.d.ts" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.

examples/example-app-router-patterns/next.config.mjs

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+/** @type {import('next').NextConfig} */
+const nextConfig = {};
+
+export default nextConfig;

examples/example-app-router-patterns/package.json

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+{
+  "name": "example-app-router-patterns",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "lint": "eslint src && prettier src --check",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "clsx": "^2.1.1",
+    "next": "^15.5.0",
+    "next-intl": "^4.0.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "tailwindcss": "^4.1.12"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "^3.1.0",
+    "@tailwindcss/postcss": "^4.1.12",
+    "@types/node": "^20.14.5",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "eslint": "9.11.1",
+    "eslint-config-next": "^15.5.0",
+    "postcss": "^8.5.3",
+    "prettier": "^3.3.3",
+    "prettier-plugin-organize-imports": "^4.2.0",
+    "prettier-plugin-tailwindcss": "^0.6.14",
+    "typescript": "^5.5.3"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "bracketSpacing": false,
+    "trailingComma": "none",
+    "plugins": [
+      "prettier-plugin-organize-imports",
+      "prettier-plugin-tailwindcss"
+    ]
+  },
+  "engines": {
+    "node": ">=20.0.0"
+  }
+}

examples/example-app-router-patterns/postcss.config.mjs

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+const config = {
+  plugins: {
+    '@tailwindcss/postcss': {}
+  }
+};
+export default config;

examples/example-app-router-patterns/src/app/design/DesignColorSwatch.tsx

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+import clsx from 'clsx';
+
+type Props = {
+  className: string;
+  value: string;
+};
+
+export default function DesignColorSwatch({className, value}: Props) {
+  return (
+    <div className="flex flex-col items-center gap-2">
+      <div className={clsx(className, 'size-20')} />
+      <div className="text-sm">{value}</div>
+    </div>
+  );
+}

examples/example-app-router-patterns/src/app/design/DesignSection.tsx

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+import {ReactNode} from 'react';
+
+type Props = {
+  children: ReactNode;
+  title: string;
+};
+
+export default function DesignSection({children, title}: Props) {
+  return (
+    <section className="space-y-8">
+      <h2 className="text-5xl font-semibold tracking-tight text-gray-900">
+        {title}
+      </h2>
+      {children}
+    </section>
+  );
+}

examples/example-app-router-patterns/src/app/design/page.tsx

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+// Documentation page for the next-intl design system
+
+import DesignColorSwatch from './DesignColorSwatch';
+import DesignSection from './DesignSection';
+
+export default function DesignPage() {
+  return (
+    <div>
+      <div className="mx-auto max-w-6xl p-20">
+        <p className="text-6xl font-semibold tracking-tight text-gray-900">
+          Design system
+        </p>
+        <div className="mt-20 space-y-16">
+          <DesignSection title="Colors">
+            <div className="space-y-8">
+              <div className="space-y-2">
+                <p className="text-xl font-semibold text-gray-900">
+                  Blue (primary)
+                </p>
+                <div className="flex items-center space-x-1">
+                  <DesignColorSwatch className="bg-gray-100" value="50" />
+                  <DesignColorSwatch className="bg-gray-100" value="100" />
+                  <DesignColorSwatch className="bg-gray-100" value="200" />
+                  <DesignColorSwatch className="bg-blue-300" value="300" />
+                  <DesignColorSwatch className="bg-gray-100" value="400" />
+                  <DesignColorSwatch className="bg-gray-100" value="500" />
+                  <DesignColorSwatch className="bg-gray-100" value="600" />
+                  <DesignColorSwatch className="bg-blue-700" value="700" />
+                  <DesignColorSwatch className="bg-gray-100" value="800" />
+                  <DesignColorSwatch className="bg-gray-100" value="900" />
+                </div>
+              </div>
+              <div className="space-y-2">
+                <p className="text-xl font-semibold text-gray-900">Gray</p>
+                <div className="flex items-center space-x-1">
+                  <DesignColorSwatch className="bg-gray-50" value="50" />
+                  <DesignColorSwatch className="bg-gray-100" value="100" />
+                  <DesignColorSwatch className="bg-gray-200" value="200" />
+                  <DesignColorSwatch className="bg-gray-300" value="300" />
+                  <DesignColorSwatch className="bg-gray-400" value="400" />
+                  <DesignColorSwatch className="bg-gray-500" value="500" />
+                  <DesignColorSwatch className="bg-gray-600" value="600" />
+                  <DesignColorSwatch className="bg-gray-700" value="700" />
+                  <DesignColorSwatch className="bg-gray-800" value="800" />
+                  <DesignColorSwatch className="bg-gray-900" value="900" />
+                </div>
+              </div>
+            </div>
+          </DesignSection>
+          <DesignSection title="Typography">
+            <div className="grid grid-cols-2">
+              <div className="bg-white py-8">
+                <div className="space-y-6">
+                  <p className="text-6xl font-semibold tracking-tight text-gray-900">
+                    Title large
+                  </p>
+                  <p className="text-5xl font-semibold tracking-tight text-gray-900">
+                    Title normal
+                  </p>
+                  <p className="text-xl text-gray-600">Title description</p>
+                  <p className="text-sm font-semibold tracking-wide text-blue-700 uppercase">
+                    Title caption
+                  </p>
+                  <p className="text-3xl font-semibold text-gray-900">
+                    Title small
+                  </p>
+                  <p className="text-xl font-semibold text-gray-900">
+                    Headline
+                  </p>
+                  <p className="text-xs font-semibold tracking-wide text-blue-700 uppercase">
+                    Headline caption
+                  </p>
+                  <p className="text-lg text-gray-700">Body large</p>
+                  <p className="text-lg text-gray-500">Body large muted</p>
+                  <p className="text-base text-gray-700">
+                    Body with{' '}
+                    <a
+                      href="#"
+                      className="font-semibold text-gray-900 underline decoration-blue-700 underline-offset-2"
+                    >
+                      a link
+                    </a>
+                  </p>
+                  <p className="text-base text-gray-500">Body muted</p>
+                  <p className="text-sm font-semibold text-gray-900">Label</p>
+                  <p className="text-sm font-semibold text-gray-500">
+                    Label muted
+                  </p>
+                  <p className="inline-block rounded border border-gray-100 bg-gray-50 px-1 py-0.5 font-mono text-base text-[0.9em] whitespace-pre">
+                    Inline code
+                  </p>
+                </div>
+              </div>
+              <div className="bg-gray-900 p-8">
+                <div className="space-y-6">
+                  <p className="text-6xl font-semibold tracking-tight text-white">
+                    Title large
+                  </p>
+                  <p className="text-5xl font-semibold tracking-tight text-white">
+                    Title normal
+                  </p>
+                  <p className="text-xl text-gray-200">Title description</p>
+                  <p className="text-sm font-semibold tracking-wide text-blue-300 uppercase">
+                    Title caption
+                  </p>
+                  <p className="text-3xl font-semibold text-white">
+                    Title small
+                  </p>
+                  <p className="text-xl font-semibold text-white">Headline</p>
+                  <p className="text-xs font-semibold tracking-wide text-blue-300 uppercase">
+                    Headline caption
+                  </p>
+                  <p className="text-lg text-white">Body large</p>
+                  <p className="text-lg text-gray-300">Body large muted</p>
+                  <p className="text-base text-gray-100">
+                    Body with{' '}
+                    <a
+                      href="#"
+                      className="font-semibold text-white underline decoration-blue-300 underline-offset-2"
+                    >
+                      a link
+                    </a>
+                  </p>
+                  <p className="text-base text-gray-300">Body muted</p>
+                  <p className="text-sm font-semibold text-white">Label</p>
+                  <p className="text-sm font-semibold text-gray-200">
+                    Label muted
+                  </p>
+                  <p className="inline-block rounded border border-gray-700 bg-gray-800 px-1 py-0.5 font-mono text-base text-[0.9em] whitespace-pre text-white">
+                    Inline code
+                  </p>
+                </div>
+              </div>
+            </div>
+          </DesignSection>
+          <DesignSection title="Surfaces">
+            <div className="grid grid-cols-2">
+              <div className="bg-white py-8 pr-8">
+                <div className="rounded-lg border border-gray-100 bg-gray-50 p-8">
+                  <p className="text-sm font-semibold tracking-wide text-blue-700 uppercase">
+                    Title caption
+                  </p>
+                  <p className="mt-2 text-5xl font-semibold tracking-tight text-gray-900">
+                    Title normal
+                  </p>
+                  <p className="mt-4 text-xl text-gray-600">
+                    Title description
+                  </p>
+                </div>
+              </div>
+              <div className="bg-gray-900 p-8">
+                <div className="rounded-lg border border-gray-700 bg-gray-800 p-8">
+                  <p className="text-sm font-semibold tracking-wide text-blue-300 uppercase">
+                    Title caption
+                  </p>
+                  <p className="mt-2 text-5xl font-semibold tracking-tight text-white">
+                    Title normal
+                  </p>
+                  <p className="mt-4 text-xl text-gray-200">
+                    Title description
+                  </p>
+                </div>
+              </div>
+            </div>
+          </DesignSection>
+        </div>
+      </div>
+    </div>
+  );
+}

examples/example-app-router-patterns/src/app/globals.css

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+@import 'tailwindcss';
+
+@theme {
+  --color-white: #ffffff;
+
+  --color-gray-50: #f7f7f8;
+  --color-gray-100: #ebebef;
+  --color-gray-200: #d1d1db;
+  --color-gray-300: #a9a9bc;
+  --color-gray-400: #8a8aa3;
+  --color-gray-500: #6c6c89;
+  --color-gray-600: #55556d;
+  --color-gray-700: #3f3f50;
+  --color-gray-800: #282833;
+  --color-gray-900: #121217;
+
+  --color-blue-300: #70d2ff;
+  --color-blue-700: #008fd6;
+
+  --font-mono:
+    Monaco, ui-monospace, SFMono-Regular, Menlo, Consolas, Liberation Mono,
+    Courier New, monospace;
+}

examples/example-app-router-patterns/src/app/layout.tsx

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+import {Inter} from 'next/font/google';
+import './globals.css';
+import {clsx} from 'clsx';
+
+const inter = Inter({
+  subsets: ['latin'],
+  variable: '--font-inter'
+});
+
+export default function RootLayout({children}: LayoutProps<'/'>) {
+  return (
+    <html>
+      <body className={clsx(inter.variable, 'antialiased')}>{children}</body>
+    </html>
+  );
+}

examples/example-app-router-patterns/src/app/page.tsx

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+import {redirect} from 'next/navigation';
+
+export default function HomePage() {
+  redirect('/design');
+}

examples/example-app-router-patterns/tsconfig.json

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+{
+  "compilerOptions": {
+    "allowArbitraryExtensions": true,
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "strict": true,
+    "allowJs": true,
+    "skipLibCheck": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "incremental": true,
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
+    "paths": {
+      "@/*": ["./src/*"]
+    },
+    // See https://github.com/amannn/next-intl/pull/1509
+    "declaration": true
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
+  "exclude": ["node_modules"]
+}