test(e2e): Port Svelte E2E test app to span streaming#23930

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Merged
msonnb merged 1 commit into from
Sep 2, 2026
Merged

test(e2e): Port Svelte E2E test app to span streaming #23930

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24 changes: 24 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore
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# 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?
62 changes: 62 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/README.md
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# 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);
```
13 changes: 13 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/index.html
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<!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>
32 changes: 32 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/package.json
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{
"name": "svelte-5-static",
"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 && pnpm build",
"test:assert": "pnpm test:prod"
},
"devDependencies": {
"@playwright/test": "~1.56.0",
"@sentry-internal/test-utils": "link:../../../test-utils",
"@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": "^5.4.11"
},
"dependencies": {
"@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
},
"volta": {
"extends": "../../package.json"
}
}
8 changes: 8 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/playwright.config.mjs
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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
startCommand: 'pnpm preview --port 3030',
port: 3030,
});

export default config;
1 change: 1 addition & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg
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52 changes: 52 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte
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<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>
79 changes: 79 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/app.css
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: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;
}
}
1 change: 1 addition & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg
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17 changes: 17 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/lib/Counter.svelte
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<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>
25 changes: 25 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts
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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
traceLifecycle: 'static',
environment: 'qa', // dynamic sampling bias to keep transactions
dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
tracesSampleRate: 1.0,
integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
tunnel: 'http://localhost:3031/', // proxy server
debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;
2 changes: 2 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts
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/// <reference types="svelte" />
/// <reference types="vite/client" />
6 changes: 6 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs
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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
port: 3031,
proxyServerName: 'svelte-5-static',
});
14 changes: 14 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js
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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
// Consult https://svelte.dev/docs#compile-time-svelte-preprocess
// for more information about preprocessors
preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;
30 changes: 30 additions & 0 deletions dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts
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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
const errorPromise = waitForError('svelte-5-static', async errorEvent => {
return !errorEvent.type;
});

await page.goto(`/`);

await page.locator('#errorBtn').click();

const error = await errorPromise;

expect(error).toMatchObject({
exception: {
values: [
{
type: 'Error',
value: 'Error thrown from Svelte 5 E2E test app',
mechanism: {
type: 'auto.browser.browserapierrors.addEventListener',
handled: false,
},
},
],
},
transaction: '/',
});
});
2 changes: 1 addition & 1 deletion ...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts
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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
});

Expand Down
Loading
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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test(e2e): Port Svelte E2E test app to span streaming#23930

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to your account

 Merged

msonnb
merged 1 commit into

from

Sep 2, 2026
 Merged


test(e2e): Port Svelte E2E test app to span streaming
#23930
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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

62 changes: 62 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/README.md

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# 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);
```

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

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<!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>

32 changes: 32 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/package.json

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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52 changes: 52 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte

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<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>

79 changes: 79 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/app.css

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: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;
 }
}

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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17 changes: 17 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/lib/Counter.svelte

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<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>

25 changes: 25 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

2 changes: 2 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

6 changes: 6 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

14 changes: 14 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

30 changes: 30 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

2 changes: 1 addition & 1 deletion
...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

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Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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test(e2e): Port Svelte E2E test app to span streaming#23930

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Sep 2, 2026
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test(e2e): Port Svelte E2E test app to span streaming
#23930
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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

62 changes: 62 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/README.md

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# 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);
```

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

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<!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>

32 changes: 32 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/package.json

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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52 changes: 52 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte

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<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>

79 changes: 79 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/app.css

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: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;
 }
}

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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17 changes: 17 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/lib/Counter.svelte

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@@ -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>

25 changes: 25 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

6 changes: 6 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

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dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

2 changes: 1 addition & 1 deletion
...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

Expand Down
Loading
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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test(e2e): Port Svelte E2E test app to span streaming#23930

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msonnb
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Sep 2, 2026
 Merged


test(e2e): Port Svelte E2E test app to span streaming
#23930
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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

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

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# 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);
```

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

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<!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>

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

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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52 changes: 52 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte

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<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>

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

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: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;
 }
}

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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

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<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>

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

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dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

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dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

2 changes: 1 addition & 1 deletion
...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
test(e2e): Port Svelte E2E test app to span streaming#23930

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to your account

 Merged

msonnb
merged 1 commit into

from

Sep 2, 2026
 Merged


test(e2e): Port Svelte E2E test app to span streaming
#23930
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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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Original file line numberDiff line numberDiff line change
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# 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?

62 changes: 62 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/README.md

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# 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);
```

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

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<!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>

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

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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52 changes: 52 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte

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<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>

79 changes: 79 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/app.css

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: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;
 }
}

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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17 changes: 17 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/lib/Counter.svelte

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<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>

25 changes: 25 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

6 changes: 6 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

30 changes: 30 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

2 changes: 1 addition & 1 deletion
...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
test(e2e): Port Svelte E2E test app to span streaming#23930

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 Merged

msonnb
merged 1 commit into

from

Sep 2, 2026
 Merged


test(e2e): Port Svelte E2E test app to span streaming
#23930
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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

62 changes: 62 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/README.md

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# 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);
```

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

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<!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>

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

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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52 changes: 52 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/App.svelte

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<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>

79 changes: 79 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/app.css

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: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;
 }
}

1 change: 1 addition & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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17 changes: 17 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/lib/Counter.svelte

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<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>

25 changes: 25 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

2 changes: 2 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

6 changes: 6 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

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dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

2 changes: 1 addition & 1 deletion
...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
test(e2e): Port Svelte E2E test app to span streaming#23930

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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to your account

 Merged

msonnb
merged 1 commit into

from

Sep 2, 2026
 Merged


test(e2e): Port Svelte E2E test app to span streaming
#23930
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dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

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

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# 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);
```

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

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<!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>

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

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

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dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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

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<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>

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

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: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;
 }
}

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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

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<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>

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

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dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

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dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

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...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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24 changes: 24 additions & 0 deletions
dev-packages/e2e-tests/test-applications/svelte-5-static/.gitignore

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# 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?

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

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# 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);
```

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

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<!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>

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

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{
 "name": "svelte-5-static",
 "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 && pnpm build",
 "test:assert": "pnpm test:prod"
 },
 "devDependencies": {
 "@playwright/test": "~1.56.0",
 "@sentry-internal/test-utils": "link:../../../test-utils",
 "@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": "^5.4.11"
 },
 "dependencies": {
 "@sentry/svelte": "file:../../packed/sentry-svelte-packed.tgz"
 },
 "volta": {
 "extends": "../../package.json"
 }
}

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';

const config = getPlaywrightConfig({
 startCommand: 'pnpm preview --port 3030',
 port: 3030,
});

export default config;

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dev-packages/e2e-tests/test-applications/svelte-5-static/public/vite.svg

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

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<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>

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

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: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;
 }
}

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/assets/svelte.svg

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

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<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>

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/main.ts

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import { mount } from 'svelte';
import App from './App.svelte';
import './app.css';

import * as Sentry from '@sentry/svelte';

Sentry.init({
 traceLifecycle: 'static',
 environment: 'qa', // dynamic sampling bias to keep transactions
 dsn: import.meta.env.PUBLIC_E2E_TEST_DSN,
 tracesSampleRate: 1.0,
 integrations: [Sentry.browserTracingIntegration(), Sentry.replayIntegration()],
 tunnel: 'http://localhost:3031/', // proxy server
 debug: !!process.env.DEBUG,
});

const target = document.getElementById('app');

if (!target) {
 throw new Error('Could not find target element');
}

const app = mount(App, { target });

export default app;

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dev-packages/e2e-tests/test-applications/svelte-5-static/src/vite-env.d.ts

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/// <reference types="svelte" />
/// <reference types="vite/client" />

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dev-packages/e2e-tests/test-applications/svelte-5-static/start-event-proxy.mjs

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import { startEventProxyServer } from '@sentry-internal/test-utils';

startEventProxyServer({
 port: 3031,
 proxyServerName: 'svelte-5-static',
});

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dev-packages/e2e-tests/test-applications/svelte-5-static/svelte.config.js

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import { withSentryConfig } from '@sentry/svelte';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

const config = {
 // Consult https://svelte.dev/docs#compile-time-svelte-preprocess
 // for more information about preprocessors
 preprocess: vitePreprocess(),
};

const configWithSentry = withSentryConfig(config, {
 componentTracking: { trackComponents: true, trackInit: true },
});

export default configWithSentry;

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dev-packages/e2e-tests/test-applications/svelte-5-static/tests/errors.test.ts

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import { expect, test } from '@playwright/test';
import { waitForError } from '@sentry-internal/test-utils';

test('sends an error', async ({ page }) => {
 const errorPromise = waitForError('svelte-5-static', async errorEvent => {
 return !errorEvent.type;
 });

 await page.goto(`/`);

 await page.locator('#errorBtn').click();

 const error = await errorPromise;

 expect(error).toMatchObject({
 exception: {
 values: [
 {
 type: 'Error',
 value: 'Error thrown from Svelte 5 E2E test app',
 mechanism: {
 type: 'auto.browser.browserapierrors.addEventListener',
 handled: false,
 },
 },
 ],
 },
 transaction: '/',
 });
});

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...ations/svelte-5/tests/performance.test.ts → ...svelte-5-static/tests/performance.test.ts

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Expand Up@@ -2,7 +2,7 @@ import { expect, test } from '@playwright/test';
import { waitForTransaction } from '@sentry-internal/test-utils';

test('sends a pageload transaction with component tracking init spans', async ({ page }) => {
 const transactionPromise = waitForTransaction('svelte-5', async transactionEvent => {
 const transactionPromise = waitForTransaction('svelte-5-static', async transactionEvent => {
 return !!transactionEvent?.transaction && transactionEvent.contexts?.trace?.op === 'pageload';
 });

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