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chore(deps): update vitest monorepo to v4 (major) #14789

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Merged
benmccann merged 10 commits into from
Jan 3, 2026
Merged

chore(deps): update vitest monorepo to v4 (major) #14789

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44e6ab3
chore(deps): update vitest monorepo to v4
renovate[bot] Dec 25, 2025
12362f9
Merge branch 'main' into renovate/major-vitest-monorepo
teemingc Jan 2, 2026
c79260b
migrate to vitest 4
teemingc Jan 2, 2026
3c4e6b1
format
teemingc Jan 2, 2026
ed96979
fix
teemingc Jan 2, 2026
e240334
tests must be isolated
teemingc Jan 2, 2026
ebb766a
fix import error
teemingc Jan 2, 2026
eabb0c8
fix
teemingc Jan 2, 2026
87dd484
format
teemingc Jan 2, 2026
94f822c
we don't need this but it snuck in
teemingc Jan 2, 2026
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2 changes: 1 addition & 1 deletion packages/adapter-auto/test/adapters.spec.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import { assert, test } from 'vitest';
import { adapters } from 'adapters.js';
import { adapters } from '../adapters.js';
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@teemingc teemingc Jan 2, 2026

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Vitest seems to be strict about explicitly specifying relative paths vs package names

import { existsSync, readFileSync } from 'node:fs';

test('adapter versions are up to date', () => {
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4 changes: 3 additions & 1 deletion packages/adapter-vercel/test/utils.spec.js
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Expand Up @@ -2,7 +2,9 @@ import { assert, test, describe } from 'vitest';
import { get_pathname, parse_isr_expiration, pattern_to_src, resolve_runtime } from '../utils.js';

// workaround so that TypeScript doesn't follow that import which makes it pick up that file and then error on missing import aliases
const { parse_route_id } = await import('../../kit/src/' + 'utils/routing.js');
const { parse_route_id } = await import(
new URL('../../kit/src/' + 'utils/routing.js', import.meta.url).href
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@teemingc teemingc Jan 2, 2026 •
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Using the module location as a base helps resolve the correct path. Otherwise, it errors with Vitest 4. This wouldn't happen if we weren't concatenating the path string. But we need to do that to prevent TypeScript from type checking the imported file which contains references to kit types that are not aliased in this package

);

/**
* @param {import('@sveltejs/kit').RouteDefinition<any>['segments']} segments
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7 changes: 2 additions & 5 deletions packages/kit/kit.vitest.config.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,11 +15,8 @@ export default defineConfig({
alias: {
'__sveltekit/paths': fileURLToPath(new URL('./test/mocks/path.js', import.meta.url))
},
poolOptions: {
threads: {
singleThread: true
}
},
pool: 'threads',
maxWorkers: 1,
include: ['src/**/*.spec.js'],
exclude: [
'**/node_modules/**',
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2 changes: 1 addition & 1 deletion packages/kit/test/apps/basics/package.json
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Expand Up @@ -25,7 +25,7 @@
"@opentelemetry/sdk-trace-node": "catalog:",
"@sveltejs/kit": "workspace:^",
"@sveltejs/vite-plugin-svelte": "catalog:",
"@vitest/browser": "catalog:",
"@vitest/browser-playwright": "catalog:",
"svelte": "catalog:",
"svelte-check": "catalog:",
"test-redirect-importer": "workspace:*",
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7 changes: 3 additions & 4 deletions packages/kit/test/apps/basics/vite.config.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import * as path from 'node:path';
import { sveltekit } from '@sveltejs/kit/vite';
import { playwright } from '@vitest/browser-playwright';
import { defineConfig } from 'vitest/config';

export default defineConfig({
Expand All @@ -25,15 +26,13 @@ export default defineConfig({
extends: './vite.config.js',
test: {
name: 'client',
environment: 'browser',
browser: {
enabled: true,
provider: 'playwright',
provider: playwright(),
instances: [{ browser: 'chromium' }],
headless: true
},
include: ['unit-test/**/*.spec.js'],
setupFiles: ['./vitest-setup-client.ts']
include: ['unit-test/**/*.spec.js']
}
}
]
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2 changes: 0 additions & 2 deletions packages/kit/test/apps/basics/vitest-setup-client.ts
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2 changes: 1 addition & 1 deletion packages/kit/test/prerendering/basics/vite.config.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import * as path from 'node:path';
import { sveltekit } from '@sveltejs/kit/vite';

/** @type {import('vitest/config').UserConfig} */
/** @type {import('vitest/config').ViteUserConfig} */
const config = {
build: {
minify: false
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