feat: initialize SvelteKit web application with Paraglide and Playwright integration

- Added package.json for project dependencies and scripts
- Created Playwright configuration for end-to-end testing
- Set up Inlang project settings for localization
- Defined app types in app.d.ts
- Created basic HTML structure in app.html
- Implemented server hooks for localization in hooks.server.ts
- Added hooks for URL rerouting in hooks.ts
- Included favicon asset
- Established library index for $lib alias
- Developed Vitest example components and tests
- Created layout and page components for routing
- Implemented demo pages for Paraglide and Playwright
- Added global CSS styles for layout
- Configured Vite for project build and testing
- Included robots.txt for web crawling instructions
- Set up TypeScript configuration for the project

apps/web/.dockerignore

@@ -0,0 +1,2 @@
+node_modules/
+dist/

apps/web/.gitignore

@@ -0,0 +1,28 @@
+node_modules
+
+# Output
+.output
+.vercel
+.netlify
+.wrangler
+/.svelte-kit
+/build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Env
+.env
+.env.*
+!.env.example
+!.env.test
+
+# Vite
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*
+# Playwright
+test-results
+# Paraglide
+src/lib/paraglide
+project.inlang/cache/

apps/web/.npmrc

@@ -0,0 +1 @@
+engine-strict=true

apps/web/.prettierignore

@@ -0,0 +1,9 @@
+# Package Managers
+package-lock.json
+pnpm-lock.yaml
+yarn.lock
+bun.lock
+bun.lockb
+
+# Miscellaneous
+/static/

apps/web/.prettierrc

@@ -0,0 +1,16 @@
+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte", "prettier-plugin-tailwindcss"],
+	"overrides": [
+		{
+			"files": "*.svelte",
+			"options": {
+				"parser": "svelte"
+			}
+		}
+	],
+	"tailwindStylesheet": "./src/routes/layout.css"
+}

apps/web/.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+	"recommendations": [
+		"svelte.svelte-vscode",
+		"esbenp.prettier-vscode",
+		"dbaeumer.vscode-eslint",
+		"bradlc.vscode-tailwindcss"
+	]
+}

apps/web/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+	"files.associations": {
+		"*.css": "tailwindcss"
+	}
+}

apps/web/Dockerfile

@@ -0,0 +1,24 @@
+FROM node:25-alpine AS base
+WORKDIR /app
+EXPOSE 3000
+
+FROM base AS development
+COPY package.json package-lock.json ./
+RUN npm i
+COPY . .
+RUN sh -c "svelte-kit sync || echo ''"
+CMD ["npx", "vite", "dev", "--port", "3000", "--host"]
+
+FROM base AS build
+COPY package.json package-lock.json ./
+RUN npm i
+COPY . .
+RUN npx vite build
+
+FROM base AS production
+ENV NODE_ENV=production
+COPY --from=build /app/build /app/build
+COPY --from=build /app/node_modules /app/node_modules
+COPY --from=build /app/package.json /app/package.json
+COPY --from=build /app/package-lock.json /app/package-lock.json
+CMD ["node", "build/index.js"]

apps/web/README.md

@@ -0,0 +1,42 @@
+# sv
+
+Everything you need to build a Svelte project, powered by [`sv`](https://github.com/sveltejs/cli).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```sh
+# create a new project
+npx sv create my-app
+```
+
+To recreate this project with the same configuration:
+
+```sh
+# recreate this project
+npx sv@0.15.2 create --template minimal --types ts --add prettier eslint vitest="usages:unit,component" playwright tailwindcss="plugins:typography,forms" sveltekit-adapter="adapter:auto" mdsvex paraglide="languageTags:en, es, fr+demo:yes" --install npm web
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```sh
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+## Building
+
+To create a production version of your app:
+
+```sh
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://svelte.dev/docs/kit/adapters) for your target environment.

apps/web/eslint.config.js

@@ -0,0 +1,44 @@
+import prettier from 'eslint-config-prettier';
+import path from 'node:path';
+import { includeIgnoreFile } from '@eslint/compat';
+import js from '@eslint/js';
+import svelte from 'eslint-plugin-svelte';
+import { defineConfig } from 'eslint/config';
+import globals from 'globals';
+import ts from 'typescript-eslint';
+import svelteConfig from './svelte.config.js';
+
+const gitignorePath = path.resolve(import.meta.dirname, '.gitignore');
+
+export default defineConfig(
+	includeIgnoreFile(gitignorePath),
+	js.configs.recommended,
+	ts.configs.recommended,
+	svelte.configs.recommended,
+	prettier,
+	svelte.configs.prettier,
+	{
+		languageOptions: { globals: { ...globals.browser, ...globals.node } },
+		rules: {
+			// typescript-eslint strongly recommend that you do not use the no-undef lint rule on TypeScript projects.
+			// see: https://typescript-eslint.io/troubleshooting/faqs/eslint/#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
+			'no-undef': 'off'
+		}
+	},
+	{
+		files: ['**/*.svelte', '**/*.svelte.ts', '**/*.svelte.js'],
+		languageOptions: {
+			parserOptions: {
+				projectService: true,
+				extraFileExtensions: ['.svelte'],
+				parser: ts.parser,
+				svelteConfig
+			}
+		}
+	},
+	{
+		// Override or add rule settings here, such as:
+		// 'svelte/button-has-type': 'error'
+		rules: {}
+	}
+);

apps/web/messages/en.json

@@ -0,0 +1,4 @@
+{
+	"$schema": "https://inlang.com/schema/inlang-message-format",
+	"hello_world": "Hello, {name} from en!"
+}

apps/web/messages/es.json

@@ -0,0 +1,4 @@
+{
+	"$schema": "https://inlang.com/schema/inlang-message-format",
+	"hello_world": "Hello, {name} from es!"
+}

apps/web/messages/fr.json

@@ -0,0 +1,4 @@
+{
+	"$schema": "https://inlang.com/schema/inlang-message-format",
+	"hello_world": "Hello, {name} from fr!"
+}

apps/web/package.json

@@ -0,0 +1,50 @@
+{
+	"name": "web",
+	"private": true,
+	"version": "0.0.1",
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"prepare": "svelte-kit sync || echo ''",
+		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"lint": "prettier --check . && eslint .",
+		"format": "prettier --write .",
+		"test:unit": "vitest",
+		"test": "npm run test:unit -- --run && npm run test:e2e",
+		"test:e2e": "playwright install && playwright test"
+	},
+	"devDependencies": {
+		"@eslint/compat": "^2.0.4",
+		"@eslint/js": "^10.0.1",
+		"@inlang/paraglide-js": "^2.15.2",
+		"@playwright/test": "^1.59.1",
+		"@sveltejs/adapter-auto": "^7.0.1",
+		"@sveltejs/kit": "^2.57.0",
+		"@sveltejs/vite-plugin-svelte": "^7.0.0",
+		"@tailwindcss/forms": "^0.5.11",
+		"@tailwindcss/typography": "^0.5.19",
+		"@tailwindcss/vite": "^4.2.2",
+		"@types/node": "^22",
+		"@vitest/browser-playwright": "^4.1.3",
+		"eslint": "^10.2.0",
+		"eslint-config-prettier": "^10.1.8",
+		"eslint-plugin-svelte": "^3.17.0",
+		"globals": "^17.4.0",
+		"mdsvex": "^0.12.7",
+		"playwright": "^1.59.1",
+		"prettier": "^3.8.1",
+		"prettier-plugin-svelte": "^3.5.1",
+		"prettier-plugin-tailwindcss": "^0.7.2",
+		"svelte": "^5.55.2",
+		"svelte-check": "^4.4.6",
+		"tailwindcss": "^4.2.2",
+		"typescript": "^6.0.2",
+		"typescript-eslint": "^8.58.1",
+		"vite": "^8.0.7",
+		"vitest": "^4.1.3",
+		"vitest-browser-svelte": "^2.1.0"
+	}
+}

apps/web/playwright.config.ts

@@ -0,0 +1,6 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+	webServer: { command: 'npm run build && npm run preview', port: 4173 },
+	testMatch: '**/*.e2e.{ts,js}'
+});

apps/web/project.inlang/settings.json

@@ -0,0 +1,12 @@
+{
+	"$schema": "https://inlang.com/schema/project-settings",
+	"modules": [
+		"https://cdn.jsdelivr.net/npm/@inlang/plugin-message-format@4/dist/index.js",
+		"https://cdn.jsdelivr.net/npm/@inlang/plugin-m-function-matcher@2/dist/index.js"
+	],
+	"plugin.inlang.messageFormat": {
+		"pathPattern": "./messages/{locale}.json"
+	},
+	"baseLocale": "en",
+	"locales": ["en", "es", "fr"]
+}

apps/web/src/app.d.ts

@@ -0,0 +1,13 @@
+// See https://svelte.dev/docs/kit/types#app.d.ts
+// for information about these interfaces
+declare global {
+	namespace App {
+		// interface Error {}
+		// interface Locals {}
+		// interface PageData {}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};

apps/web/src/app.html

@@ -0,0 +1,16 @@
+<!doctype html>
+
+<html lang="%paraglide.lang%" dir="%paraglide.dir%">
+	<head>
+		<meta charset="utf-8" />
+
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+
+		<meta name="text-scale" content="scale" />
+		%sveltekit.head%
+	</head>
+
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>

apps/web/src/hooks.server.ts

@@ -0,0 +1,17 @@
+import type { Handle } from '@sveltejs/kit';
+import { getTextDirection } from '$lib/paraglide/runtime';
+import { paraglideMiddleware } from '$lib/paraglide/server';
+
+const handleParaglide: Handle = ({ event, resolve }) =>
+	paraglideMiddleware(event.request, ({ request, locale }) => {
+		event.request = request;
+
+		return resolve(event, {
+			transformPageChunk: ({ html }) =>
+				html
+					.replace('%paraglide.lang%', locale)
+					.replace('%paraglide.dir%', getTextDirection(locale))
+		});
+	});
+
+export const handle: Handle = handleParaglide;

apps/web/src/hooks.ts

@@ -0,0 +1,4 @@
+import type { Reroute } from '@sveltejs/kit';
+import { deLocalizeUrl } from '$lib/paraglide/runtime';
+
+export const reroute: Reroute = (request) => deLocalizeUrl(request.url).pathname;

apps/web/src/lib/assets/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="107" height="128" viewBox="0 0 107 128"><title>svelte-logo</title><path d="M94.157 22.819c-10.4-14.885-30.94-19.297-45.792-9.835L22.282 29.608A29.92 29.92 0 0 0 8.764 49.65a31.5 31.5 0 0 0 3.108 20.231 30 30 0 0 0-4.477 11.183 31.9 31.9 0 0 0 5.448 24.116c10.402 14.887 30.942 19.297 45.791 9.835l26.083-16.624A29.92 29.92 0 0 0 98.235 78.35a31.53 31.53 0 0 0-3.105-20.232 30 30 0 0 0 4.474-11.182 31.88 31.88 0 0 0-5.447-24.116" style="fill:#ff3e00"/><path d="M45.817 106.582a20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.503 18 18 0 0 1 .624-2.435l.49-1.498 1.337.981a33.6 33.6 0 0 0 10.203 5.098l.97.294-.09.968a5.85 5.85 0 0 0 1.052 3.878 6.24 6.24 0 0 0 6.695 2.485 5.8 5.8 0 0 0 1.603-.704L69.27 76.28a5.43 5.43 0 0 0 2.45-3.631 5.8 5.8 0 0 0-.987-4.371 6.24 6.24 0 0 0-6.698-2.487 5.7 5.7 0 0 0-1.6.704l-9.953 6.345a19 19 0 0 1-5.296 2.326 20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.502 17.99 17.99 0 0 1 8.13-12.052l26.081-16.623a19 19 0 0 1 5.3-2.329 20.72 20.72 0 0 1 22.237 8.243 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-.624 2.435l-.49 1.498-1.337-.98a33.6 33.6 0 0 0-10.203-5.1l-.97-.294.09-.968a5.86 5.86 0 0 0-1.052-3.878 6.24 6.24 0 0 0-6.696-2.485 5.8 5.8 0 0 0-1.602.704L37.73 51.72a5.42 5.42 0 0 0-2.449 3.63 5.79 5.79 0 0 0 .986 4.372 6.24 6.24 0 0 0 6.698 2.486 5.8 5.8 0 0 0 1.602-.704l9.952-6.342a19 19 0 0 1 5.295-2.328 20.72 20.72 0 0 1 22.237 8.242 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-8.13 12.053l-26.081 16.622a19 19 0 0 1-5.3 2.328" style="fill:#fff"/></svg>

apps/web/src/lib/index.ts

@@ -0,0 +1 @@
+// place files you want to import through the `$lib` alias in this folder.

apps/web/src/lib/vitest-examples/Welcome.svelte

@@ -0,0 +1,8 @@
+<script>
+	import { greet } from './greet';
+
+	let { host = 'SvelteKit', guest = 'Vitest' } = $props();
+</script>
+
+<h1>{greet(host)}</h1>
+<p>{greet(guest)}</p>

apps/web/src/lib/vitest-examples/Welcome.svelte.spec.ts

@@ -0,0 +1,15 @@
+import { page } from 'vitest/browser';
+import { describe, expect, it } from 'vitest';
+import { render } from 'vitest-browser-svelte';
+import Welcome from './Welcome.svelte';
+
+describe('Welcome.svelte', () => {
+	it('renders greetings for host and guest', async () => {
+		render(Welcome, { host: 'SvelteKit', guest: 'Vitest' });
+
+		await expect
+			.element(page.getByRole('heading', { level: 1 }))
+			.toHaveTextContent('Hello, SvelteKit!');
+		await expect.element(page.getByText('Hello, Vitest!')).toBeInTheDocument();
+	});
+});

apps/web/src/lib/vitest-examples/greet.spec.ts

@@ -0,0 +1,8 @@
+import { describe, it, expect } from 'vitest';
+import { greet } from './greet';
+
+describe('greet', () => {
+	it('returns a greeting', () => {
+		expect(greet('Svelte')).toBe('Hello, Svelte!');
+	});
+});

apps/web/src/lib/vitest-examples/greet.ts

@@ -0,0 +1,3 @@
+export function greet(name: string): string {
+	return 'Hello, ' + name + '!';
+}

apps/web/src/routes/+layout.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import type { Pathname } from '$app/types';
+	import { resolve } from '$app/paths';
+	import { page } from '$app/state';
+	import { locales, localizeHref } from '$lib/paraglide/runtime';
+	import './layout.css';
+	import favicon from '$lib/assets/favicon.svg';
+
+	let { children } = $props();
+</script>
+
+<svelte:head><link rel="icon" href={favicon} /></svelte:head>
+{@render children()}
+
+<div style="display:none">
+	{#each locales as locale (locale)}
+		<a href={resolve(localizeHref(page.url.pathname, { locale }) as Pathname)}>{locale}</a>
+	{/each}
+</div>

apps/web/src/routes/+page.svelte

@@ -0,0 +1,2 @@
+<h1>Welcome to SvelteKit</h1>
+<p>Visit <a href="https://svelte.dev/docs/kit">svelte.dev/docs/kit</a> to read the documentation</p>

apps/web/src/routes/demo/+page.svelte

@@ -0,0 +1,6 @@
+<script lang="ts">
+	import { resolve } from '$app/paths';
+</script>
+
+<a href={resolve('/demo/paraglide')}>paraglide</a>
+<a href={resolve('/demo/playwright')}>playwright</a>

apps/web/src/routes/demo/paraglide/+page.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+	import { setLocale } from '$lib/paraglide/runtime';
+	import { m } from '$lib/paraglide/messages.js';
+</script>
+
+<h1>{m.hello_world({ name: 'SvelteKit User' })}</h1>
+
+<div>
+	<button onclick={() => setLocale('en')}>en</button>
+	<button onclick={() => setLocale('es')}>es</button>
+	<button onclick={() => setLocale('fr')}>fr</button>
+</div>
+
+<p>
+	If you use VSCode, install the
+
+	<a
+		href="https://marketplace.visualstudio.com/items?itemName=inlang.vs-code-extension"
+		target="_blank">Sherlock i18n extension</a
+	>
+
+	for a better i18n experience.
+</p>

apps/web/src/routes/demo/playwright/+page.svelte

@@ -0,0 +1 @@
+<h1>Playwright e2e test demo</h1>

apps/web/src/routes/demo/playwright/page.svelte.e2e.ts

@@ -0,0 +1,6 @@
+import { expect, test } from '@playwright/test';
+
+test('has expected h1', async ({ page }) => {
+	await page.goto('/demo/playwright');
+	await expect(page.locator('h1')).toBeVisible();
+});

apps/web/src/routes/layout.css

@@ -0,0 +1,3 @@
+@import 'tailwindcss';
+@plugin '@tailwindcss/forms';
+@plugin '@tailwindcss/typography';

apps/web/static/robots.txt

@@ -0,0 +1,3 @@
+# allow crawling everything by default
+User-agent: *
+Disallow:

apps/web/svelte.config.js

@@ -0,0 +1,20 @@
+import { mdsvex } from 'mdsvex';
+import adapter from '@sveltejs/adapter-auto';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	compilerOptions: {
+		// Force runes mode for the project, except for libraries. Can be removed in svelte 6.
+		runes: ({ filename }) => (filename.split(/[/\\]/).includes('node_modules') ? undefined : true)
+	},
+	kit: {
+		// adapter-auto only supports some environments, see https://svelte.dev/docs/kit/adapter-auto for a list.
+		// If your environment is not supported, or you settled on a specific environment, switch out the adapter.
+		// See https://svelte.dev/docs/kit/adapters for more information about adapters.
+		adapter: adapter()
+	},
+	preprocess: [mdsvex({ extensions: ['.svx', '.md'] })],
+	extensions: ['.svelte', '.svx', '.md']
+};
+
+export default config;

apps/web/tsconfig.json

@@ -0,0 +1,20 @@
+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"rewriteRelativeImportExtensions": true,
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+	// Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
+	// except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
+	//
+	// To make changes to top-level options such as include and exclude, we recommend extending
+	// the generated config; see https://svelte.dev/docs/kit/configuration#typescript
+}

apps/web/vite.config.ts

@@ -0,0 +1,41 @@
+import { paraglideVitePlugin } from '@inlang/paraglide-js';
+import tailwindcss from '@tailwindcss/vite';
+import { defineConfig } from 'vitest/config';
+import { playwright } from '@vitest/browser-playwright';
+import { sveltekit } from '@sveltejs/kit/vite';
+
+export default defineConfig({
+	plugins: [
+		tailwindcss(),
+		sveltekit(),
+		paraglideVitePlugin({ project: './project.inlang', outdir: './src/lib/paraglide' })
+	],
+	test: {
+		expect: { requireAssertions: true },
+		projects: [
+			{
+				extends: './vite.config.ts',
+				test: {
+					name: 'client',
+					browser: {
+						enabled: true,
+						provider: playwright(),
+						instances: [{ browser: 'chromium', headless: true }]
+					},
+					include: ['src/**/*.svelte.{test,spec}.{js,ts}'],
+					exclude: ['src/lib/server/**']
+				}
+			},
+
+			{
+				extends: './vite.config.ts',
+				test: {
+					name: 'server',
+					environment: 'node',
+					include: ['src/**/*.{test,spec}.{js,ts}'],
+					exclude: ['src/**/*.svelte.{test,spec}.{js,ts}']
+				}
+			}
+		]
+	}
+});