Add SvelteKit Example (#684)

* Add SvelteKit Example

* package-lock.json

apps/sveltekit-app/.eslintignore

@@ -0,0 +1,13 @@
+.DS_Store
+node_modules
+/build
+/.svelte-kit
+/package
+.env
+.env.*
+!.env.example
+
+# Ignore files for PNPM, NPM and YARN
+pnpm-lock.yaml
+package-lock.json
+yarn.lock

apps/sveltekit-app/.eslintrc.cjs

@@ -0,0 +1,31 @@
+/** @type { import("eslint").Linter.Config } */
+module.exports = {
+	root: true,
+	extends: [
+		'eslint:recommended',
+		'plugin:@typescript-eslint/recommended',
+		'plugin:svelte/recommended',
+		'prettier'
+	],
+	parser: '@typescript-eslint/parser',
+	plugins: ['@typescript-eslint'],
+	parserOptions: {
+		sourceType: 'module',
+		ecmaVersion: 2020,
+		extraFileExtensions: ['.svelte']
+	},
+	env: {
+		browser: true,
+		es2017: true,
+		node: true
+	},
+	overrides: [
+		{
+			files: ['*.svelte'],
+			parser: 'svelte-eslint-parser',
+			parserOptions: {
+				parser: '@typescript-eslint/parser'
+			}
+		}
+	]
+};

apps/sveltekit-app/.gitignore

@@ -0,0 +1,10 @@
+.DS_Store
+node_modules
+/build
+/.svelte-kit
+/package
+.env
+.env.*
+!.env.example
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

apps/sveltekit-app/.npmrc

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

apps/sveltekit-app/.prettierignore

@@ -0,0 +1,4 @@
+# Ignore files for PNPM, NPM and YARN
+pnpm-lock.yaml
+package-lock.json
+yarn.lock

apps/sveltekit-app/.prettierrc

@@ -0,0 +1,8 @@
+{
+	"useTabs": true,
+	"singleQuote": true,
+	"trailingComma": "none",
+	"printWidth": 100,
+	"plugins": ["prettier-plugin-svelte"],
+	"overrides": [{ "files": "*.svelte", "options": { "parser": "svelte" } }]
+}

apps/sveltekit-app/README.md

@@ -0,0 +1,38 @@
+# create-svelte
+
+Everything you need to build a Svelte project, powered by [`create-svelte`](https://github.com/sveltejs/kit/tree/main/packages/create-svelte).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```bash
+# create a new project in the current directory
+npm create svelte@latest
+
+# create a new project in my-app
+npm create svelte@latest my-app
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```bash
+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:
+
+```bash
+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://kit.svelte.dev/docs/adapters) for your target environment.

apps/sveltekit-app/package.json

@@ -0,0 +1,41 @@
+{
+	"name": "sveltekit-app",
+	"version": "0.0.1",
+	"private": true,
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"preview": "vite preview",
+		"test": "npm run test:integration && npm run test:unit",
+		"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:integration": "playwright test",
+		"test:unit": "vitest"
+	},
+	"devDependencies": {
+		"@ffmpeg/ffmpeg": "*",
+		"@ffmpeg/util": "*",
+		"@playwright/test": "^1.41.2",
+		"@sveltejs/adapter-auto": "^3.1.1",
+		"@sveltejs/kit": "^2.5.0",
+		"@sveltejs/vite-plugin-svelte": "^3.0.2",
+		"@tsconfig/node18": "^18.2.2",
+		"@types/eslint": "8.56.2",
+		"@typescript-eslint/eslint-plugin": "^6.21.0",
+		"@typescript-eslint/parser": "^6.21.0",
+		"eslint": "^8.56.0",
+		"eslint-config-prettier": "^9.1.0",
+		"eslint-plugin-svelte": "^2.35.1",
+		"prettier": "^3.2.5",
+		"prettier-plugin-svelte": "^3.1.2",
+		"svelte": "^4.2.10",
+		"svelte-check": "^3.6.4",
+		"tslib": "^2.6.2",
+		"typescript": "^5.3.3",
+		"vite": "^5.1.1",
+		"vitest": "^1.2.2"
+	},
+	"type": "module"
+}

apps/sveltekit-app/playwright.config.ts

@@ -0,0 +1,12 @@
+import type { PlaywrightTestConfig } from '@playwright/test';
+
+const config: PlaywrightTestConfig = {
+	webServer: {
+		command: 'npm run build && npm run preview',
+		port: 4173
+	},
+	testDir: 'tests',
+	testMatch: /(.+\.)?(test|spec)\.[jt]s/
+};
+
+export default config;

apps/sveltekit-app/src/app.d.ts

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

apps/sveltekit-app/src/app.html

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+	<head>
+		<meta charset="utf-8" />
+		<link rel="icon" href="%sveltekit.assets%/favicon.png" />
+		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		%sveltekit.head%
+	</head>
+	<body data-sveltekit-preload-data="hover">
+		<div style="display: contents">%sveltekit.body%</div>
+	</body>
+</html>

apps/sveltekit-app/src/index.test.ts

@@ -0,0 +1,7 @@
+import { describe, it, expect } from 'vitest';
+
+describe('sum test', () => {
+	it('adds 1 + 2 to equal 3', () => {
+		expect(1 + 2).toBe(3);
+	});
+});

apps/sveltekit-app/src/lib/FFmpegDemo.svelte

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+<script lang="ts">
+	import { FFmpeg } from '@ffmpeg/ffmpeg';
+	// @ts-ignore
+	import type { LogEvent } from '@ffmpeg/ffmpeg/dist/esm/types';
+	import { fetchFile, toBlobURL } from '@ffmpeg/util';
+
+	let videoEl: HTMLVideoElement;
+
+	const baseURL = 'https://unpkg.com/@ffmpeg/[email protected]/dist/esm';
+	const videoURL = 'https://raw.githubusercontent.com/ffmpegwasm/testdata/master/video-15s.avi';
+
+	let message = 'Click Start to Transcode';
+
+	async function transcode() {
+		const ffmpeg = new FFmpeg();
+		message = 'Loading ffmpeg-core.js';
+		ffmpeg.on('log', ({ message: msg }: LogEvent) => {
+			message = msg;
+			console.log(message);
+		});
+		await ffmpeg.load({
+			coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),
+			wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),
+			workerURL: await toBlobURL(`${baseURL}/ffmpeg-core.worker.js`, 'text/javascript')
+		});
+		message = 'Start transcoding';
+		await ffmpeg.writeFile('test.avi', await fetchFile(videoURL));
+		await ffmpeg.exec(['-i', 'test.avi', 'test.mp4']);
+		message = 'Complete transcoding';
+		const data = await ffmpeg.readFile('test.mp4');
+		console.log('done');
+		videoEl.src = URL.createObjectURL(
+			new Blob([(data as Uint8Array).buffer], { type: 'video/mp4' })
+		);
+	}
+</script>
+
+<div>
+	<!-- svelte-ignore a11y-media-has-caption -->
+	<video bind:this={videoEl} controls />
+	<br />
+	<button on:click={transcode}>Start</button>
+	<p>{message}</p>
+</div>

apps/sveltekit-app/src/lib/index.ts

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+// place files you want to import through the `$lib` alias in this folder.

apps/sveltekit-app/src/routes/+page.svelte

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+<script lang="ts">
+	import FFmpegDemo from '../lib/FFmpegDemo.svelte';
+</script>
+
+<h1>Welcome to SvelteKit</h1>
+<p>Visit <a href="https://kit.svelte.dev">kit.svelte.dev</a> to read the documentation</p>
+<FFmpegDemo></FFmpegDemo>

apps/sveltekit-app/svelte.config.js

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+import adapter from '@sveltejs/adapter-auto';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	// Consult https://kit.svelte.dev/docs/integrations#preprocessors
+	// for more information about preprocessors
+	preprocess: vitePreprocess(),
+
+	kit: {
+		// adapter-auto only supports some environments, see https://kit.svelte.dev/docs/adapter-auto for a list.
+		// If your environment is not supported or you settled on a specific environment, switch out the adapter.
+		// See https://kit.svelte.dev/docs/adapters for more information about adapters.
+		adapter: adapter()
+	}
+};
+
+export default config;

apps/sveltekit-app/tests/test.ts

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+import { expect, test } from '@playwright/test';
+
+test('index page has expected h1', async ({ page }) => {
+	await page.goto('/');
+	await expect(page.getByRole('heading', { name: 'Welcome to SvelteKit' })).toBeVisible();
+});

apps/sveltekit-app/tsconfig.json

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+{
+	"extends": "./.svelte-kit/tsconfig.json",
+	"compilerOptions": {
+		"allowJs": true,
+		"checkJs": true,
+		"esModuleInterop": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"skipLibCheck": true,
+		"sourceMap": true,
+		"strict": true,
+		"moduleResolution": "bundler"
+	}
+	// Path aliases are handled by https://kit.svelte.dev/docs/configuration#alias
+	//
+	// If you want to overwrite includes/excludes, make sure to copy over the relevant includes/excludes
+	// from the referenced tsconfig.json - TypeScript does not merge them in
+}

apps/sveltekit-app/vite.config.ts

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+import { sveltekit } from '@sveltejs/kit/vite';
+import { fileURLToPath, URL } from 'node:url'
+import { defineConfig } from 'vitest/config';
+
+/** @type {import('vite').Plugin} */
+const viteServerConfig = {
+    name: 'log-request-middleware',
+    configureServer(server) {
+        server.middlewares.use((req, res, next) => {
+            res.setHeader("Access-Control-Allow-Origin", "*");
+            res.setHeader("Access-Control-Allow-Methods", "GET");
+            res.setHeader("Cross-Origin-Opener-Policy", "same-origin");
+            res.setHeader("Cross-Origin-Embedder-Policy", "require-corp");
+            next();
+        });
+    }
+};
+
+
+export default defineConfig({
+	plugins: [sveltekit(), viteServerConfig],
+	test: {
+		include: ['src/**/*.{test,spec}.{js,ts}']
+	},
+	resolve: {
+		alias: {
+		  '@': fileURLToPath(new URL('./src', import.meta.url))
+		}
+	  },
+	  optimizeDeps: {
+		exclude: ['@ffmpeg/ffmpeg', '@ffmpeg/util']
+	  },
+	  server: {
+		headers: {
+		  'Cross-Origin-Opener-Policy': 'same-origin',
+		  'Cross-Origin-Embedder-Policy': 'require-corp'
+		},
+		fs: {
+			allow: ['../..']
+		}
+	  }	
+});

apps/website/docs/getting-started/examples.md

@@ -53,5 +53,13 @@ any of the examples.
         url="https://github.com/ffmpegwasm/ffmpeg.wasm/tree/main/apps/nextjs-app"
       />
     </Grid>
+    <Grid xs={12} sm={6} md={6} lg={6} xl={4}>
+      <ExampleCard
+        img="/img/sveltekit-vite.png"
+        title="SvelteKit + Vite"
+        desc="SvelteKit with Vite (multithread version)"
+        url="https://github.com/ffmpegwasm/ffmpeg.wasm/tree/main/apps/sveltekit-vite-app"
+      />
+    </Grid>
   </Grid>
 </MuiThemeProvider>