test(svelte): Add Svelte 5 E2E test app (#11814)

In #11807 I added a SvelteKit+Svelte 5 E2E test. Let's also add a small
Svelte 5 standalone/SPA app ensure we cover such apps as well.

.github/workflows/build.yml

@@ -1006,6 +1006,7 @@ jobs:
             'react-create-hash-router',
             'react-router-6-use-routes',
             'standard-frontend-react',
+            'svelte-5',
             'sveltekit',
             'sveltekit-2',
             'sveltekit-2-svelte-5',

dev-packages/e2e-tests/test-applications/svelte-5/.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

dev-packages/e2e-tests/test-applications/svelte-5/.npmrc

@@ -0,0 +1,2 @@
+@sentry:registry=http://127.0.0.1:4873
+@sentry-internal:registry=http://127.0.0.1:4873

dev-packages/e2e-tests/test-applications/svelte-5/README.md

@@ -0,0 +1,62 @@
+# Svelte + TS + Vite
+
+This template should help get you started developing with Svelte and TypeScript in Vite.
+
+## Recommended IDE Setup
+
+[VS Code](https://code.visualstudio.com/) +
+[Svelte](https://marketplace.visualstudio.com/items?itemName=svelte.svelte-vscode).
+
+## Need an official Svelte framework?
+
+Check out [SvelteKit](https://github.com/sveltejs/kit#readme), which is also powered by Vite. Deploy anywhere with its
+serverless-first approach and adapt to various platforms, with out of the box support for TypeScript, SCSS, and Less,
+and easily-added support for mdsvex, GraphQL, PostCSS, Tailwind CSS, and more.
+
+## Technical considerations
+
+**Why use this over SvelteKit?**
+
+- It brings its own routing solution which might not be preferable for some users.
+- It is first and foremost a framework that just happens to use Vite under the hood, not a Vite app.
+
+This template contains as little as possible to get started with Vite + TypeScript + Svelte, while taking into account
+the developer experience with regards to HMR and intellisense. It demonstrates capabilities on par with the other
+`create-vite` templates and is a good starting point for beginners dipping their toes into a Vite + Svelte project.
+
+Should you later need the extended capabilities and extensibility provided by SvelteKit, the template has been
+structured similarly to SvelteKit so that it is easy to migrate.
+
+**Why `global.d.ts` instead of `compilerOptions.types` inside `jsconfig.json` or `tsconfig.json`?**
+
+Setting `compilerOptions.types` shuts out all other types not explicitly listed in the configuration. Using triple-slash
+references keeps the default TypeScript setting of accepting type information from the entire workspace, while also
+adding `svelte` and `vite/client` type information.
+
+**Why include `.vscode/extensions.json`?**
+
+Other templates indirectly recommend extensions via the README, but this file allows VS Code to prompt the user to
+install the recommended extension upon opening the project.
+
+**Why enable `allowJs` in the TS template?**
+
+While `allowJs: false` would indeed prevent the use of `.js` files in the project, it does not prevent the use of
+JavaScript syntax in `.svelte` files. In addition, it would force `checkJs: false`, bringing the worst of both worlds:
+not being able to guarantee the entire codebase is TypeScript, and also having worse typechecking for the existing
+JavaScript. In addition, there are valid use cases in which a mixed codebase may be relevant.
+
+**Why is HMR not preserving my local component state?**
+
+HMR state preservation comes with a number of gotchas! It has been disabled by default in both `svelte-hmr` and
+`@sveltejs/vite-plugin-svelte` due to its often surprising behavior. You can read the details
+[here](https://github.com/rixo/svelte-hmr#svelte-hmr).
+
+If you have state that's important to retain within a component, consider creating an external store which would not be
+replaced by HMR.
+
+```ts
+// store.ts
+// An extremely simple external store
+import { writable } from 'svelte/store';
+export default writable(0);
+```

dev-packages/e2e-tests/test-applications/svelte-5/index.html

@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Vite + Svelte + TS</title>
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>

dev-packages/e2e-tests/test-applications/svelte-5/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "svelte-5",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-check --tsconfig ./tsconfig.json",
+    "test:prod": "TEST_ENV=production playwright test",
+    "test:build": "pnpm install && npx playwright install && pnpm build",
+    "test:assert": "pnpm test:prod"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.43.1",
+    "@sentry-internal/event-proxy-server": "link:../../../event-proxy-server",
+    "@sentry/types": "latest || *",
+    "@sentry/utils": "latest || *",
+    "@sveltejs/vite-plugin-svelte": "^3.0.2",
+    "@tsconfig/svelte": "^5.0.2",
+    "svelte": "^5.0.0-next.115",
+    "svelte-check": "^3.6.7",
+    "tslib": "^2.6.2",
+    "typescript": "^5.2.2",
+    "vite": "^5.2.0",
+    "wait-port": "1.0.4"
+  },
+  "dependencies": {
+    "@sentry/svelte": "latest || *"
+  }
+}

dev-packages/e2e-tests/test-applications/svelte-5/playwright.config.ts

@@ -0,0 +1,77 @@
+import type { PlaywrightTestConfig } from '@playwright/test';
+import { devices } from '@playwright/test';
+
+// Fix urls not resolving to localhost on Node v17+
+// See: https://github.com/axios/axios/issues/3821#issuecomment-1413727575
+import { setDefaultResultOrder } from 'dns';
+setDefaultResultOrder('ipv4first');
+
+const testEnv = process.env.TEST_ENV;
+
+if (!testEnv) {
+  throw new Error('No test env defined');
+}
+
+const sveltePort = 3030;
+const eventProxyPort = 3031;
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+const config: PlaywrightTestConfig = {
+  testDir: './test',
+  /* Maximum time one test can run for. */
+  timeout: 150_000,
+  expect: {
+    /**
+     * Maximum time expect() should wait for the condition to be met.
+     * For example in `await expect(locator).toHaveText();`
+     */
+    timeout: 10000,
+  },
+  /* Run tests in files in parallel */
+  fullyParallel: false,
+  workers: 1,
+  /* Fail the build on CI if you accidentally left test.only in the source code. */
+  forbidOnly: !!process.env.CI,
+  /* `next dev` is incredibly buggy with the app dir */
+  retries: testEnv === 'development' ? 3 : 0,
+  /* Reporter to use. See https://playwright.dev/docs/test-reporters */
+  reporter: 'list',
+  /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+  use: {
+    /* Maximum time each action such as `click()` can take. Defaults to 0 (no limit). */
+    actionTimeout: 0,
+    /* Base URL to use in actions like `await page.goto('/')`. */
+    baseURL: `http://localhost:${sveltePort}`,
+
+    /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
+    trace: 'on-first-retry',
+  },
+
+  /* Configure projects for major browsers */
+  projects: [
+    {
+      name: 'chromium',
+      use: {
+        ...devices['Desktop Chrome'],
+      },
+    },
+  ],
+
+  /* Run your local dev server before starting the tests */
+  webServer: [
+    {
+      command: 'node ./start-event-proxy.cjs',
+      port: eventProxyPort,
+      reuseExistingServer: false,
+    },
+    {
+      command: `pnpm wait-port ${eventProxyPort} && pnpm preview --port ${sveltePort}`,
+      port: sveltePort,
+      reuseExistingServer: false,
+    },
+  ],
+};
+
+export default config;

dev-packages/e2e-tests/test-applications/svelte-5/src/App.svelte

@@ -0,0 +1,52 @@
+<script lang="ts">
+  import svelteLogo from './assets/svelte.svg'
+  import viteLogo from '/vite.svg'
+  import Counter from './lib/Counter.svelte'
+
+  function throwError() {
+    throw new Error('Error thrown from Svelte 5 E2E test app')
+  }
+</script>
+
+<main>
+  <div>
+    <a href="https://vitejs.dev" target="_blank" rel="noreferrer">
+      <img src={viteLogo} class="logo" alt="Vite Logo" />
+    </a>
+    <a href="https://svelte.dev" target="_blank" rel="noreferrer">
+      <img src={svelteLogo} class="logo svelte" alt="Svelte Logo" />
+    </a>
+  </div>
+  <h1>Vite + Svelte</h1>
+
+  <div class="card">
+    <Counter />
+    <button id="errorBtn" onclick={() => throwError()}>Error</button>
+  </div>
+
+  <p>
+    Check out <a href="https://github.com/sveltejs/kit#readme" target="_blank" rel="noreferrer">SvelteKit</a>, the official Svelte app framework powered by Vite!
+  </p>
+
+  <p class="read-the-docs">
+    Click on the Vite and Svelte logos to learn more
+  </p>
+</main>
+
+<style>
+  .logo {
+    height: 6em;
+    padding: 1.5em;
+    will-change: filter;
+    transition: filter 300ms;
+  }
+  .logo:hover {
+    filter: drop-shadow(0 0 2em #646cffaa);
+  }
+  .logo.svelte:hover {
+    filter: drop-shadow(0 0 2em #ff3e00aa);
+  }
+  .read-the-docs {
+    color: #888;
+  }
+</style>

dev-packages/e2e-tests/test-applications/svelte-5/src/app.css

@@ -0,0 +1,79 @@
+:root {
+  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  color-scheme: light dark;
+  color: rgba(255, 255, 255, 0.87);
+  background-color: #242424;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+.card {
+  padding: 2em;
+}
+
+#app {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+button {
+  border-radius: 8px;
+  border: 1px solid transparent;
+  padding: 0.6em 1.2em;
+  font-size: 1em;
+  font-weight: 500;
+  font-family: inherit;
+  background-color: #1a1a1a;
+  cursor: pointer;
+  transition: border-color 0.25s;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  :root {
+    color: #213547;
+    background-color: #ffffff;
+  }
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}

dev-packages/e2e-tests/test-applications/svelte-5/src/lib/Counter.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+	let count = $state(0);
+
+  function increment() {
+    count += 1;
+  }
+
+  let doubled = $derived(count * 2);
+</script>
+
+<button onclick={increment}>
+  count is {count}
+</button>
+
+<p>
+  doubled: {doubled}
+</p>