fix(sveltekit): Detect used adapter via svelte.config.js#19270

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Lms24 merged 4 commits into from
Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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c9d10d0
fix(sveltekit): Detect used adapter via `svelte.config.js`
Lms24 Feb 11, 2026
452eb15
tests
Lms24 Feb 11, 2026
574e965
clean up types
Lms24 Feb 11, 2026
de7f373
more cleanup
Lms24 Feb 11, 2026
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62 changes: 47 additions & 15 deletions packages/sveltekit/src/vite/detectAdapter.ts
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@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
* Supported @sveltejs/adapters-[adapter] SvelteKit adapters
*/
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {

@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters

@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)

'@sveltejs/adapter-vercel': 'vercel',
'@sveltejs/adapter-node': 'node',
'@sveltejs/adapter-cloudflare': 'cloudflare',
// adapter-auto is intentionally the last entry here because it's installed by default
// many users don't remove it when installing a new adapter, so we need to make sure
// it's detected last when doing the package.json based detection.
'@sveltejs/adapter-auto': 'auto',
};

/**
* Tries to detect the used adapter for SvelteKit by looking at the dependencies.
* returns the name of the adapter or 'other' if no supported adapter was found.
* Tries to detect the used adapter for SvelteKit.
* 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
* 2. Otherwise falls back to inferring from package.json dependencies.
* Returns the name of the adapter or 'other' if no supported adapter was found.
*
* @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
* @param debug - Whether to log detection result. Pass `undefined` for false.
*/
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
const pkgJson = await loadPackageJson();
export async function detectAdapter(
svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
const adapterName = svelteConfig?.kit?.adapter?.name;
if (adapterName && typeof adapterName === 'string') {
const mapped = ADAPTER_NAME_MAP[adapterName];
if (mapped) {
if (debug) {
// eslint-disable-next-line no-console
console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
}
return mapped;
}
// We found an adapter name but it's not in our supported list -> return 'other'
// svelte.config.js is the source of truth, so we don't need to fall back to package.json.
if (debug) {
// eslint-disable-next-line no-console
console.warn(
`[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
);
}
return 'other';
}

const pkgJson = await loadPackageJson();
const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

let adapter: SupportedSvelteKitAdapters = 'other';
if (allDependencies['@sveltejs/adapter-vercel']) {
adapter = 'vercel';
} else if (allDependencies['@sveltejs/adapter-node']) {
adapter = 'node';
} else if (allDependencies['@sveltejs/adapter-cloudflare']) {
adapter = 'cloudflare';
} else if (allDependencies['@sveltejs/adapter-auto']) {
adapter = 'auto';
}
const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

if (debug) {
if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
);
} else {
// eslint-disable-next-line no-console
console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
}
}

Expand Down
6 changes: 3 additions & 3 deletions packages/sveltekit/src/vite/sentryVitePlugins.ts
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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
* Make sure, it is registered before the SvelteKit plugin.
*/
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
const svelteConfig = await loadSvelteConfig();

const mergedOptions = {
...DEFAULT_PLUGIN_OPTIONS,
...options,
adapter: options.adapter || (await detectAdapter(options.debug)),
adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
};

const svelteConfig = await loadSvelteConfig();

const sentryPlugins: Plugin[] = [];

if (mergedOptions.autoInstrument) {
Expand Down
142 changes: 96 additions & 46 deletions packages/sveltekit/test/vite/detectAdapter.test.ts
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Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
dependencies: {} as Record<string, string>,
devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
beforeEach(() => {
existsFile = true;
vi.clearAllMocks();
pkgJson.dependencies = {};
pkgJson.devDependencies = {};
});

vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

it.each(['auto', 'vercel', 'node', 'cloudflare'])(
'returns the adapter name (adapter %s) and logs it to the console',
async adapter => {
pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
const detectedAdapter = await detectAdapter(true);
expect(detectedAdapter).toEqual(adapter);
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
},
);

it('returns "other" if no supported adapter was found', async () => {
pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
const detectedAdapter = await detectAdapter();
expect(detectedAdapter).toEqual('other');
});
describe('svelte.config.js (source of truth)', () => {
it.each(['auto', 'vercel', 'node', 'cloudflare'])(
'returns adapter from kit.adapter.name when provided (adapter %s)',
async adapter => {
const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
const detectedAdapter = await detectAdapter(svelteConfig, undefined);
expect(detectedAdapter).toEqual(adapter);
},
);

it('prefers svelte.config.js over package.json when both are present', async () => {
pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
const detectedAdapter = await detectAdapter(svelteConfig, undefined);
expect(detectedAdapter).toEqual('node');
});

it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
const detectedAdapter = await detectAdapter(svelteConfig, undefined);
expect(detectedAdapter).toEqual('other');
});

it('logs a warning if in debug mode and no supported adapter was found', async () => {
pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
const detectedAdapter = await detectAdapter(true);
expect(detectedAdapter).toEqual('other');
expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
await detectAdapter(svelteConfig, true);
expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
});

it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
await detectAdapter(svelteConfig, true);
expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
});
});

it('returns "other" if package.json isnt available and emits a warning log', async () => {
existsFile = false;
const detectedAdapter = await detectAdapter();
expect(detectedAdapter).toEqual('other');
describe('package.json detection (fallback)', () => {
it.each(['auto', 'vercel', 'node', 'cloudflare'])(
'returns the adapter name (adapter %s) from dependencies and logs it to the console',
async adapter => {
pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
const detectedAdapter = await detectAdapter(undefined, true);
expect(detectedAdapter).toEqual(adapter);
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
},
);

expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledWith(
expect.stringContaining("Couldn't load package.json"),
expect.any(Error),
it.each(['auto', 'vercel', 'node', 'cloudflare'])(
'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
async adapter => {
pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
const detectedAdapter = await detectAdapter(undefined, true);
expect(detectedAdapter).toEqual(adapter);
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
},
);
});

it('prefers all other adapters over adapter auto', async () => {
pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

const detectedAdapter = await detectAdapter();
expect(detectedAdapter).toEqual('vercel');

delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
const detectedAdapter2 = await detectAdapter();
expect(detectedAdapter2).toEqual('node');
delete pkgJson.dependencies['@sveltejs/adapter-node'];
const detectedAdapter3 = await detectAdapter();
expect(detectedAdapter3).toEqual('cloudflare');
it('returns "other" if no supported adapter was found', async () => {
pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
const detectedAdapter = await detectAdapter(undefined, undefined);
expect(detectedAdapter).toEqual('other');
});

it('logs a warning if in debug mode and no supported adapter was found', async () => {
pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
const detectedAdapter = await detectAdapter(undefined, true);
expect(detectedAdapter).toEqual('other');
expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
});

it('returns "other" if package.json isnt available and emits a warning log', async () => {
existsFile = false;
const detectedAdapter = await detectAdapter(undefined, undefined);
expect(detectedAdapter).toEqual('other');

expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledWith(
expect.stringContaining("Couldn't load package.json"),
expect.any(Error),
);
});

it('prefers all other adapters over adapter auto', async () => {
pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
expect(await detectAdapter(undefined, undefined)).toEqual('node');

delete pkgJson.dependencies['@sveltejs/adapter-node'];
expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
});
});
});
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 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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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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 Merged

Lms24
merged 4 commits into

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Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
de7f373

more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
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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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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Lms24
merged 4 commits into

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Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
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Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
Loading

, '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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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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 Merged

Lms24
merged 4 commits into

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Feb 11, 2026
 Merged


fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
de7f373

more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
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" + '

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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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Lms24
merged 4 commits into

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Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
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more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
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('^' + ".*" + '

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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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 Merged

Lms24
merged 4 commits into

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Feb 11, 2026
 Merged


fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
de7f373

more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
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
fix(sveltekit): Detect used adapter via svelte.config.js#19270

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 Merged

Lms24
merged 4 commits into

from

Feb 11, 2026
 Merged


fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
de7f373

more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
Loading

, '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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fix(sveltekit): Detect used adapter via svelte.config.js#19270

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 Merged

Lms24
merged 4 commits into

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Feb 11, 2026
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fix(sveltekit): Detect used adapter via svelte.config.js#19270
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c9d10d0

fix(sveltekit): Detect used adapter via `svelte.config.js`


Lms24 Feb 11, 2026
452eb15

tests


Lms24 Feb 11, 2026
574e965

clean up types


Lms24 Feb 11, 2026
de7f373

more cleanup


Lms24 Feb 11, 2026

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62 changes: 47 additions & 15 deletions
packages/sveltekit/src/vite/detectAdapter.ts

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,63 @@
import type { Package } from '@sentry/core';
import * as fs from 'fs';
import * as path from 'path';
import type { BackwardsForwardsCompatibleSvelteConfig } from './svelteConfig';

/**
 * Supported @sveltejs/adapters-[adapter] SvelteKit adapters
 */
export type SupportedSvelteKitAdapters = 'node' | 'auto' | 'vercel' | 'cloudflare' | 'other';

/** Maps adapter.name from svelte.config.js to our SupportedSvelteKitAdapters */
const ADAPTER_NAME_MAP: Record<string, SupportedSvelteKitAdapters> = {
@chargomechargomeFeb 11, 2026

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There is also netflify and static – do we need these? https://svelte.dev/docs/kit/adapters
@Lms24Lms24Feb 11, 2026

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not supported at the moment, so I'd rather avoid it (for now)
 '@sveltejs/adapter-vercel': 'vercel',
 '@sveltejs/adapter-node': 'node',
 '@sveltejs/adapter-cloudflare': 'cloudflare',
 // adapter-auto is intentionally the last entry here because it's installed by default
 // many users don't remove it when installing a new adapter, so we need to make sure
 // it's detected last when doing the package.json based detection.
 '@sveltejs/adapter-auto': 'auto',
};

/**
 * Tries to detect the used adapter for SvelteKit by looking at the dependencies.
 * returns the name of the adapter or 'other' if no supported adapter was found.
 * Tries to detect the used adapter for SvelteKit.
 * 1. If svelteConfig is provided and has kit.adapter.name, uses that (source of truth from svelte.config.js).
 * 2. Otherwise falls back to inferring from package.json dependencies.
 * Returns the name of the adapter or 'other' if no supported adapter was found.
 *
 * @param svelteConfig - Loaded svelte config (e.g. from loadSvelteConfig()). Pass `undefined` to skip config-based detection.
 * @param debug - Whether to log detection result. Pass `undefined` for false.
 */
export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKitAdapters> {
 const pkgJson = await loadPackageJson();
export async function detectAdapter(
 svelteConfig: BackwardsForwardsCompatibleSvelteConfig | undefined,
 debug: boolean | undefined,
): Promise<SupportedSvelteKitAdapters> {
 const adapterName = svelteConfig?.kit?.adapter?.name;
 if (adapterName && typeof adapterName === 'string') {
 const mapped = ADAPTER_NAME_MAP[adapterName];
 if (mapped) {
 if (debug) {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${mapped} adapter from \`svelte.config.js\``);
 }
 return mapped;
 }
 // We found an adapter name but it's not in our supported list -> return 'other'
 // svelte.config.js is the source of truth, so we don't need to fall back to package.json.
 if (debug) {
 // eslint-disable-next-line no-console
 console.warn(
 `[Sentry SvelteKit Plugin] Detected unsupported adapter name ${adapterName} in \`svelte.config.js\`. Please set the 'adapter' option manually`,
 );
 }
 return 'other';
 }

 const pkgJson = await loadPackageJson();
 const allDependencies = pkgJson ? { ...pkgJson.dependencies, ...pkgJson.devDependencies } : {};

 let adapter: SupportedSvelteKitAdapters = 'other';
 if (allDependencies['@sveltejs/adapter-vercel']) {
 adapter = 'vercel';
 } else if (allDependencies['@sveltejs/adapter-node']) {
 adapter = 'node';
 } else if (allDependencies['@sveltejs/adapter-cloudflare']) {
 adapter = 'cloudflare';
 } else if (allDependencies['@sveltejs/adapter-auto']) {
 adapter = 'auto';
 }
 const adapterPackage = Object.keys(ADAPTER_NAME_MAP).find(key => allDependencies[key]);
 const adapter = (adapterPackage && ADAPTER_NAME_MAP[adapterPackage]) || 'other';

 if (debug) {
 if (adapter === 'other') {
Expand All@@ -35,7 +67,7 @@ export async function detectAdapter(debug?: boolean): Promise<SupportedSvelteKit
 );
 } else {
 // eslint-disable-next-line no-console
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter`);
 console.log(`[Sentry SvelteKit Plugin] Detected SvelteKit ${adapter} adapter from \`package.json\``);
 }
 }

Expand Down

6 changes: 3 additions & 3 deletions
packages/sveltekit/src/vite/sentryVitePlugins.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -21,14 +21,14 @@ const DEFAULT_PLUGIN_OPTIONS: SentrySvelteKitPluginOptions = {
 * Make sure, it is registered before the SvelteKit plugin.
 */
export async function sentrySvelteKit(options: SentrySvelteKitPluginOptions = {}): Promise<Plugin[]> {
 const svelteConfig = await loadSvelteConfig();

 const mergedOptions = {
 ...DEFAULT_PLUGIN_OPTIONS,
 ...options,
 adapter: options.adapter || (await detectAdapter(options.debug)),
 adapter: options.adapter || (await detectAdapter(svelteConfig, options.debug)),
 };

 const svelteConfig = await loadSvelteConfig();

 const sentryPlugins: Plugin[] = [];

 if (mergedOptions.autoInstrument) {
Expand Down

142 changes: 96 additions & 46 deletions
packages/sveltekit/test/vite/detectAdapter.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -4,12 +4,14 @@ import { detectAdapter } from '../../src/vite/detectAdapter';
let existsFile = true;
const pkgJson = {
 dependencies: {} as Record<string, string>,
 devDependencies: {} as Record<string, string>,
};
describe('detectAdapter', () => {
 beforeEach(() => {
 existsFile = true;
 vi.clearAllMocks();
 pkgJson.dependencies = {};
 pkgJson.devDependencies = {};
 });

 vi.mock('fs', () => {
Expand All@@ -26,57 +28,105 @@ describe('detectAdapter', () => {
 const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});

 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 });
 describe('svelte.config.js (source of truth)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns adapter from kit.adapter.name when provided (adapter %s)',
 async adapter => {
 const svelteConfig = { kit: { adapter: { name: `@sveltejs/adapter-${adapter}` } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual(adapter);
 },
 );

 it('prefers svelte.config.js over package.json when both are present', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-node' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('node');
 });

 it('returns "other" when found adapter name in svelte.config.js is unsupported', async () => {
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 const detectedAdapter = await detectAdapter(svelteConfig, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 it('logs a warning if in debug mode and an unsupported adapter name is found in svelte.config.js', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-netlify' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('Detected unsupported adapter name'));
 });

 it('logs "from svelte.config.js" in debug when adapter comes from config', async () => {
 const svelteConfig = { kit: { adapter: { name: '@sveltejs/adapter-vercel' } } };
 await detectAdapter(svelteConfig, true);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining('from `svelte.config.js`'));
 });
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('other');
 describe('package.json detection (fallback)', () => {
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from dependencies and logs it to the console',
 async adapter => {
 pkgJson.dependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 it.each(['auto', 'vercel', 'node', 'cloudflare'])(
 'returns the adapter name (adapter %s) from devDependencies and logs it to the console',
 async adapter => {
 pkgJson.devDependencies[`@sveltejs/adapter-${adapter}`] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual(adapter);
 expect(consoleLogSpy).toHaveBeenCalledTimes(1);
 expect(consoleLogSpy).toHaveBeenCalledWith(expect.stringContaining(`Detected SvelteKit ${adapter} adapter`));
 },
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 const detectedAdapter = await detectAdapter();
 expect(detectedAdapter).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 const detectedAdapter2 = await detectAdapter();
 expect(detectedAdapter2).toEqual('node');
 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 const detectedAdapter3 = await detectAdapter();
 expect(detectedAdapter3).toEqual('cloudflare');
 it('returns "other" if no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');
 });

 it('logs a warning if in debug mode and no supported adapter was found', async () => {
 pkgJson.dependencies['@sveltejs/adapter-netlify'] = '1.0.0';
 const detectedAdapter = await detectAdapter(undefined, true);
 expect(detectedAdapter).toEqual('other');
 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining("Couldn't detect SvelteKit adapter"));
 });

 it('returns "other" if package.json isnt available and emits a warning log', async () => {
 existsFile = false;
 const detectedAdapter = await detectAdapter(undefined, undefined);
 expect(detectedAdapter).toEqual('other');

 expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
 expect(consoleWarnSpy).toHaveBeenCalledWith(
 expect.stringContaining("Couldn't load package.json"),
 expect.any(Error),
 );
 });

 it('prefers all other adapters over adapter auto', async () => {
 pkgJson.dependencies['@sveltejs/adapter-auto'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-vercel'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-node'] = '1.0.0';
 pkgJson.dependencies['@sveltejs/adapter-cloudflare'] = '1.0.0';

 expect(await detectAdapter(undefined, undefined)).toEqual('vercel');

 delete pkgJson.dependencies['@sveltejs/adapter-vercel'];
 expect(await detectAdapter(undefined, undefined)).toEqual('node');

 delete pkgJson.dependencies['@sveltejs/adapter-node'];
 expect(await detectAdapter(undefined, undefined)).toEqual('cloudflare');
 });
 });
});
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