diff --git a/packages/adapter-cloudflare/test/apps/workers/test/test.js b/packages/adapter-cloudflare/test/apps/workers/test/test.js
index 40072953a16f..44832c70890f 100644
--- a/packages/adapter-cloudflare/test/apps/workers/test/test.js
+++ b/packages/adapter-cloudflare/test/apps/workers/test/test.js
@@ -1,10 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { fileURLToPath } from 'node:url';
 import { expect, test } from '@playwright/test';
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
 test('worker', async ({ page }) => {
 	await page.goto('/');
 	await expect(page.locator('h1')).toContainText('Sum: 3');
@@ -16,7 +13,10 @@ test('ctx', async ({ request }) => {
 });
 
 test('read from $app/server works', async ({ request }) => {
-	const content = fs.readFileSync(path.resolve(__dirname, '../src/routes/read/file.txt'), 'utf-8');
+	const content = fs.readFileSync(
+		path.resolve(import.meta.dirname, '../src/routes/read/file.txt'),
+		'utf-8'
+	);
 	const response = await request.get('/read');
 	expect(await response.text()).toBe(content);
 });
diff --git a/packages/adapter-netlify/test/apps/basic/test/test.js b/packages/adapter-netlify/test/apps/basic/test/test.js
index 89d91598c165..b208dd54a8b7 100644
--- a/packages/adapter-netlify/test/apps/basic/test/test.js
+++ b/packages/adapter-netlify/test/apps/basic/test/test.js
@@ -1,10 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { fileURLToPath } from 'node:url';
 import { expect, test } from '@playwright/test';
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
 test('page renders', async ({ request }) => {
 	const response = await request.get('/');
 	expect(response.status()).toBe(200);
@@ -18,17 +15,23 @@ test('dynamic route works', async ({ request }) => {
 });
 
 test('read from $app/server works', async ({ request }) => {
-	const content = fs.readFileSync(path.resolve(__dirname, '../src/routes/read/file.txt'), 'utf-8');
+	const content = fs.readFileSync(
+		path.resolve(import.meta.dirname, '../src/routes/read/file.txt'),
+		'utf-8'
+	);
 	const response = await request.get('/read');
 	expect(await response.text()).toBe(content);
 });
 
 test('_redirects are copied to publish directory', () => {
-	const redirects = fs.readFileSync(path.resolve(__dirname, '../build/_redirects'), 'utf-8');
+	const redirects = fs.readFileSync(
+		path.resolve(import.meta.dirname, '../build/_redirects'),
+		'utf-8'
+	);
 	expect(redirects).toContain('/redirect-me /greeting/redirected 301');
 });
 
 test('_headers are copied to publish directory', () => {
-	const headers = fs.readFileSync(path.resolve(__dirname, '../build/_headers'), 'utf-8');
+	const headers = fs.readFileSync(path.resolve(import.meta.dirname, '../build/_headers'), 'utf-8');
 	expect(headers).toContain('X-Custom-Header: test-value');
 });
diff --git a/packages/adapter-netlify/test/apps/edge/test/test.js b/packages/adapter-netlify/test/apps/edge/test/test.js
index 8053aaa563a2..11818baa35c5 100644
--- a/packages/adapter-netlify/test/apps/edge/test/test.js
+++ b/packages/adapter-netlify/test/apps/edge/test/test.js
@@ -1,10 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { fileURLToPath } from 'node:url';
 import { expect, test } from '@playwright/test';
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
 test('page renders', async ({ request }) => {
 	const response = await request.get('/');
 	expect(response.status()).toBe(200);
@@ -18,12 +15,15 @@ test('dynamic route works', async ({ request }) => {
 });
 
 test('read from $app/server works', async ({ request }) => {
-	const content = fs.readFileSync(path.resolve(__dirname, '../src/routes/read/file.txt'), 'utf-8');
+	const content = fs.readFileSync(
+		path.resolve(import.meta.dirname, '../src/routes/read/file.txt'),
+		'utf-8'
+	);
 	const response = await request.get('/read');
 	expect(await response.text()).toBe(content);
 });
 
 test('_headers are copied to publish directory', () => {
-	const headers = fs.readFileSync(path.resolve(__dirname, '../build/_headers'), 'utf-8');
+	const headers = fs.readFileSync(path.resolve(import.meta.dirname, '../build/_headers'), 'utf-8');
 	expect(headers).toContain('X-Custom-Header: test-value');
 });
diff --git a/packages/enhanced-img/test/markup-plugin.spec.js b/packages/enhanced-img/test/markup-plugin.spec.js
index b6dacafe3ec1..33b9288a6c0c 100644
--- a/packages/enhanced-img/test/markup-plugin.spec.js
+++ b/packages/enhanced-img/test/markup-plugin.spec.js
@@ -3,7 +3,7 @@ import path from 'node:path';
 import { expect, it } from 'vitest';
 import { image_plugin, parse_object } from '../src/vite-plugin.js';
 
-const resolve = /** @param {string} file */ (file) => path.resolve(__dirname, file);
+const resolve = /** @param {string} file */ (file) => path.resolve(import.meta.dirname, file);
 
 it('Image preprocess snapshot test', async () => {
 	const filename = 'Input.svelte';
diff --git a/packages/kit/src/core/adapt/builder.spec.js b/packages/kit/src/core/adapt/builder.spec.js
index b69c7b8296bb..304a1ba5987d 100644
--- a/packages/kit/src/core/adapt/builder.spec.js
+++ b/packages/kit/src/core/adapt/builder.spec.js
@@ -6,11 +6,8 @@ import { create_builder } from './builder.js';
 import { posixify } from '../../utils/filesystem.js';
 import { list_files } from '../utils.js';
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = join(__filename, '..');
-
 test('copy files', () => {
-	const cwd = join(__dirname, 'fixtures/basic');
+	const cwd = join(import.meta.dirname, 'fixtures/basic');
 	const outDir = join(cwd, '.svelte-kit');
 
 	/** @type {import('@sveltejs/kit').Config} */
@@ -19,7 +16,7 @@ test('copy files', () => {
 		kit: {
 			appDir: '_app',
 			files: {
-				assets: join(__dirname, 'fixtures/basic/static')
+				assets: join(import.meta.dirname, 'fixtures/basic/static')
 			},
 			outDir
 		}
@@ -42,7 +39,7 @@ test('copy files', () => {
 		log: {}
 	});
 
-	const dest = join(__dirname, 'output');
+	const dest = join(import.meta.dirname, 'output');
 
 	rmSync(dest, { recursive: true, force: true });
 
@@ -74,8 +71,8 @@ test('compress files', async () => {
 });
 
 test('instrument generates facade with posix paths', () => {
-	const fixtureDir = join(__dirname, 'fixtures/instrument');
-	const dest = join(__dirname, 'output');
+	const fixtureDir = join(import.meta.dirname, 'fixtures/instrument');
+	const dest = join(import.meta.dirname, 'output');
 
 	rmSync(dest, { recursive: true, force: true });
 	mkdirSync(join(dest, 'server'), { recursive: true });
diff --git a/packages/kit/src/core/config/index.spec.js b/packages/kit/src/core/config/index.spec.js
index 549538e20d18..5a32221a0d58 100644
--- a/packages/kit/src/core/config/index.spec.js
+++ b/packages/kit/src/core/config/index.spec.js
@@ -1,12 +1,8 @@
 import { join } from 'node:path';
-import { fileURLToPath } from 'node:url';
 import { assert, expect, test } from 'vitest';
 import { validate_config, load_config } from './index.js';
 import process from 'node:process';
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = join(__filename, '..');
-
 /**
  * mutates and remove keys from an object when check callback returns true
  * @param {Record<string, any>} o any object
@@ -362,7 +358,7 @@ validate_paths(
 );
 
 test('load default config (esm)', async () => {
-	const cwd = join(__dirname, 'fixtures/default');
+	const cwd = join(import.meta.dirname, 'fixtures/default');
 
 	const config = await load_config({ cwd });
 	remove_keys(config, ([, v]) => typeof v === 'function');
@@ -374,7 +370,7 @@ test('load default config (esm)', async () => {
 });
 
 test('load default config (esm) with .ts extensions', async () => {
-	const cwd = join(__dirname, 'fixtures/typescript');
+	const cwd = join(import.meta.dirname, 'fixtures/typescript');
 
 	const config = await load_config({ cwd });
 	remove_keys(config, ([, v]) => typeof v === 'function');
@@ -386,7 +382,7 @@ test('load default config (esm) with .ts extensions', async () => {
 });
 
 test('load .js config when both .js and .ts configs are present', async () => {
-	const cwd = join(__dirname, 'fixtures/multiple');
+	const cwd = join(import.meta.dirname, 'fixtures/multiple');
 
 	const config = await load_config({ cwd });
 	remove_keys(config, ([, v]) => typeof v === 'function');
@@ -401,7 +397,7 @@ test('errors on loading config with incorrect default export', async () => {
 	let message = null;
 
 	try {
-		const cwd = join(__dirname, 'fixtures', 'export-string');
+		const cwd = join(import.meta.dirname, 'fixtures', 'export-string');
 		await load_config({ cwd });
 	} catch (/** @type {any} */ e) {
 		message = e.message;
@@ -505,7 +501,7 @@ test('errors on invalid forkPreloads values', () => {
 });
 
 test('uses src prefix for other kit.files options', async () => {
-	const cwd = join(__dirname, 'fixtures/custom-src');
+	const cwd = join(import.meta.dirname, 'fixtures/custom-src');
 
 	const config = await load_config({ cwd });
 	remove_keys(config, ([, v]) => typeof v === 'function');
diff --git a/packages/kit/test/apps/dev-only/test/test.js b/packages/kit/test/apps/dev-only/test/test.js
index 1b9099a923f1..6e2a96dd8782 100644
--- a/packages/kit/test/apps/dev-only/test/test.js
+++ b/packages/kit/test/apps/dev-only/test/test.js
@@ -3,9 +3,6 @@ import { test } from '../../../utils.js';
 import fs from 'node:fs';
 import path from 'node:path';
 import process from 'node:process';
-import { fileURLToPath } from 'node:url';
-
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 /** @typedef {import('@playwright/test').Response} Response */
 
@@ -86,7 +83,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-page-svelte');
@@ -96,7 +96,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-page-universal');
@@ -106,7 +109,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).not.toHaveProperty('optimized.e2e-test-dep-page-server');
@@ -116,7 +122,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-layout-svelte');
@@ -126,7 +135,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-layout-universal');
@@ -136,7 +148,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).not.toHaveProperty('optimized.e2e-test-dep-layout-server');
@@ -146,7 +161,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-error');
@@ -156,7 +174,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-hooks-client');
@@ -166,7 +187,10 @@ test.describe('Vite', () => {
 		await page.goto('/');
 		await page.getByText('hello world!').waitFor();
 
-		const manifest_path = path.join(__dirname, '../node_modules/.vite/deps/_metadata.json');
+		const manifest_path = path.join(
+			import.meta.dirname,
+			'../node_modules/.vite/deps/_metadata.json'
+		);
 		const manifest = JSON.parse(fs.readFileSync(manifest_path, 'utf-8'));
 
 		expect(manifest).toHaveProperty('optimized.e2e-test-dep-hooks');
diff --git a/packages/kit/test/apps/options-2/test/test.js b/packages/kit/test/apps/options-2/test/test.js
index f3df40146a8d..8a1d74487ab8 100644
--- a/packages/kit/test/apps/options-2/test/test.js
+++ b/packages/kit/test/apps/options-2/test/test.js
@@ -1,6 +1,5 @@
 import path from 'node:path';
 import process from 'node:process';
-import { fileURLToPath } from 'node:url';
 import { expect } from '@playwright/test';
 import { test } from '../../../utils.js';
 
@@ -126,11 +125,10 @@ test.describe('trailing slash', () => {
 test.describe('Service worker', () => {
 	if (process.env.DEV) {
 		test('import proxy /basepath/service-worker.js', async ({ request }) => {
-			const __dirname = path.dirname(fileURLToPath(import.meta.url));
 			const response = await request.get('/basepath/service-worker.js');
 			const content = await response.text();
 			expect(content).toEqual(
-				`import '${path.join('/basepath', '/@fs', __dirname, '../src/service-worker.js')}';`
+				`import '${path.join('/basepath', '/@fs', import.meta.dirname, '../src/service-worker.js')}';`
 			);
 		});
 
diff --git a/packages/kit/test/apps/writes/test/test.js b/packages/kit/test/apps/writes/test/test.js
index e513c647f37d..83c069633829 100644
--- a/packages/kit/test/apps/writes/test/test.js
+++ b/packages/kit/test/apps/writes/test/test.js
@@ -18,8 +18,10 @@ test.describe('Filesystem updates', () => {
 			// future test file that has the same name
 			const route = 'zzzz' + Date.now();
 			const content = 'Hello new route';
-			const __dirname = path.dirname(fileURLToPath(import.meta.url));
-			const filepath = path.join(__dirname, `../src/routes/new-route/${route}/+page.svelte`);
+			const filepath = path.join(
+				import.meta.dirname,
+				`../src/routes/new-route/${route}/+page.svelte`
+			);
 			const dir = path.dirname(filepath);
 
 			try {
diff --git a/packages/kit/test/build-errors/env.spec.js b/packages/kit/test/build-errors/env.spec.js
index aa41d4db6545..061d6a3c9a77 100644
--- a/packages/kit/test/build-errors/env.spec.js
+++ b/packages/kit/test/build-errors/env.spec.js
@@ -13,7 +13,7 @@ test('$env/dynamic/private is not statically importable from the client', { time
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/private-dynamic-env'),
+				cwd: path.join(import.meta.dirname, 'apps/private-dynamic-env'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -26,7 +26,7 @@ test('$env/dynamic/private is not dynamically importable from the client', { tim
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/private-dynamic-env-dynamic-import'),
+				cwd: path.join(import.meta.dirname, 'apps/private-dynamic-env-dynamic-import'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -39,7 +39,7 @@ test('$env/static/private is not statically importable from the client', { timeo
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/private-static-env'),
+				cwd: path.join(import.meta.dirname, 'apps/private-static-env'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -52,7 +52,7 @@ test('$env/static/private is not dynamically importable from the client', { time
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/private-static-env-dynamic-import'),
+				cwd: path.join(import.meta.dirname, 'apps/private-static-env-dynamic-import'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -65,7 +65,7 @@ test('$env/dynamic/private is not importable from the service worker', { timeout
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/service-worker-private-env'),
+				cwd: path.join(import.meta.dirname, 'apps/service-worker-private-env'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -78,7 +78,7 @@ test('$env/dynamic/public is not importable from the service worker', { timeout
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/service-worker-dynamic-public-env'),
+				cwd: path.join(import.meta.dirname, 'apps/service-worker-dynamic-public-env'),
 				stdio: 'pipe',
 				timeout,
 				env
diff --git a/packages/kit/test/build-errors/prerender.spec.js b/packages/kit/test/build-errors/prerender.spec.js
index 903d2491e858..e788055bac8b 100644
--- a/packages/kit/test/build-errors/prerender.spec.js
+++ b/packages/kit/test/build-errors/prerender.spec.js
@@ -2,7 +2,6 @@ import { assert, test } from 'vitest';
 import { execSync } from 'node:child_process';
 import path from 'node:path';
 import { EOL } from 'node:os';
-import process from 'node:process';
 
 const timeout = 60_000;
 
@@ -10,7 +9,7 @@ test('prerenderable routes must be prerendered', { timeout }, () => {
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/prerenderable-not-prerendered'),
+				cwd: path.join(import.meta.dirname, 'apps/prerenderable-not-prerendered'),
 				stdio: 'pipe',
 				timeout
 			}),
@@ -22,7 +21,7 @@ test('entry generators should match their own route', { timeout }, () => {
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/prerender-entry-generator-mismatch'),
+				cwd: path.join(import.meta.dirname, 'apps/prerender-entry-generator-mismatch'),
 				stdio: 'pipe',
 				timeout
 			}),
@@ -34,7 +33,7 @@ test('an error in a `prerender` function should fail the build', { timeout }, ()
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/prerender-remote-function-error'),
+				cwd: path.join(import.meta.dirname, 'apps/prerender-remote-function-error'),
 				stdio: 'pipe',
 				timeout
 			}),
diff --git a/packages/kit/test/build-errors/server-only.spec.js b/packages/kit/test/build-errors/server-only.spec.js
index 67bccd96afd3..1de049a8ff56 100644
--- a/packages/kit/test/build-errors/server-only.spec.js
+++ b/packages/kit/test/build-errors/server-only.spec.js
@@ -13,7 +13,7 @@ test('$lib/*.server.* is not statically importable from the client', { timeout }
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/server-only-module'),
+				cwd: path.join(import.meta.dirname, 'apps/server-only-module'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -26,7 +26,7 @@ test('$lib/*.server.* is not dynamically importable from the client', { timeout
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/server-only-module-dynamic-import'),
+				cwd: path.join(import.meta.dirname, 'apps/server-only-module-dynamic-import'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -39,7 +39,7 @@ test('$lib/server/* is not statically importable from the client', { timeout },
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/server-only-folder'),
+				cwd: path.join(import.meta.dirname, 'apps/server-only-folder'),
 				stdio: 'pipe',
 				timeout,
 				env
@@ -52,7 +52,7 @@ test('$lib/server/* is not dynamically importable from the client', { timeout },
 	assert.throws(
 		() =>
 			execSync('pnpm build', {
-				cwd: path.join(process.cwd(), 'apps/server-only-folder-dynamic-import'),
+				cwd: path.join(import.meta.dirname, 'apps/server-only-folder-dynamic-import'),
 				stdio: 'pipe',
 				timeout,
 				env
diff --git a/packages/kit/test/build-errors/syntax-error.spec.js b/packages/kit/test/build-errors/syntax-error.spec.js
index 9abc21f59ba2..5d0456b761f6 100644
--- a/packages/kit/test/build-errors/syntax-error.spec.js
+++ b/packages/kit/test/build-errors/syntax-error.spec.js
@@ -1,14 +1,13 @@
 import { assert, test } from 'vitest';
 import { execSync } from 'node:child_process';
 import path from 'node:path';
-import process from 'node:process';
 
 const timeout = 60_000;
 
 test('$lib/*.server.* is not statically importable from the client', { timeout }, () => {
 	try {
 		execSync('pnpm build', {
-			cwd: path.join(process.cwd(), 'apps/syntax-error'),
+			cwd: path.join(import.meta.dirname, 'apps/syntax-error'),
 			stdio: 'pipe',
 			timeout
 		});
diff --git a/packages/package/test/index.spec.js b/packages/package/test/index.spec.js
index e972d823ed4f..4ed145ca1abf 100644
--- a/packages/package/test/index.spec.js
+++ b/packages/package/test/index.spec.js
@@ -1,7 +1,6 @@
 import fs from 'node:fs';
 import process from 'node:process';
 import { join, resolve } from 'node:path';
-import { fileURLToPath } from 'node:url';
 
 import prettier from 'prettier';
 import { test, expect } from 'vitest';
@@ -12,15 +11,12 @@ import { rimraf, walk } from '../src/filesystem.js';
 import { _create_validator } from '../src/validate.js';
 import { resolve_aliases } from '../src/utils.js';
 
-const __filename = fileURLToPath(import.meta.url);
-const __dirname = join(__filename, '..');
-
 /**
  * @param {string} path
  * @param {Partial<import('../src/types.js').Options>} [options]
  */
 async function test_make_package(path, options) {
-	const cwd = join(__dirname, 'fixtures', path);
+	const cwd = join(import.meta.dirname, 'fixtures', path);
 	const ewd = join(cwd, 'expected');
 	const output = join(cwd, 'dist');
 
@@ -85,9 +81,9 @@ async function format(file, content) {
 	});
 }
 
-for (const dir of fs.readdirSync(join(__dirname, 'errors'))) {
+for (const dir of fs.readdirSync(join(import.meta.dirname, 'errors'))) {
 	test(`package error [${dir}]`, async () => {
-		const cwd = join(__dirname, 'errors', dir);
+		const cwd = join(import.meta.dirname, 'errors', dir);
 		const output = join(cwd, 'dist');
 
 		const config = await load_config({ cwd });
@@ -177,7 +173,7 @@ test('create package with tsconfig specified', async () => {
 // chokidar doesn't fire events in github actions :shrug:
 if (!process.env.CI) {
 	test('watches for changes', async () => {
-		const cwd = join(__dirname, 'watch');
+		const cwd = join(import.meta.dirname, 'watch');
 
 		const config = await load_config({ cwd });
 
@@ -197,7 +193,7 @@ if (!process.env.CI) {
 
 		/** @param {string} file */
 		function read(file) {
-			return fs.readFileSync(join(__dirname, 'watch', file), 'utf-8');
+			return fs.readFileSync(join(import.meta.dirname, 'watch', file), 'utf-8');
 		}
 
 		/**
@@ -205,12 +201,12 @@ if (!process.env.CI) {
 		 * @param {string} data
 		 */
 		function write(file, data) {
-			return fs.writeFileSync(join(__dirname, 'watch', file), data);
+			return fs.writeFileSync(join(import.meta.dirname, 'watch', file), data);
 		}
 
 		/** @param {string} file */
 		function remove(file) {
-			const filepath = join(__dirname, 'watch', file);
+			const filepath = join(import.meta.dirname, 'watch', file);
 			if (fs.existsSync(filepath)) fs.unlinkSync(filepath);
 		}
 
@@ -346,7 +342,7 @@ test('validates package (all ok 2)', () => {
 });
 
 test('create package with preserved output', async () => {
-	const output = join(__dirname, 'fixtures', 'preserve-output', 'dist');
+	const output = join(import.meta.dirname, 'fixtures', 'preserve-output', 'dist');
 	rimraf(output);
 	fs.mkdirSync(join(output, 'assets'), { recursive: true });
 	fs.writeFileSync(join(output, 'assets', 'theme.css'), ':root { color: red }');