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Addon-Vitest: Improve config file detection in monorepos #33814

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Merged
valentinpalkovic merged 2 commits into from
Feb 12, 2026
Merged

Addon-Vitest: Improve config file detection in monorepos #33814

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ada93bc
Addon-Vitest: Improve config file detection in monorepos
valentinpalkovic Feb 9, 2026
b09081a
Harden lookup of Vitest config
valentinpalkovic Feb 12, 2026
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55 changes: 45 additions & 10 deletions code/addons/vitest/src/node/vitest-manager.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { existsSync } from 'node:fs';
import { existsSync, readFileSync } from 'node:fs';

import type {
CoverageOptions,
Expand All @@ -13,7 +13,8 @@ import { Tag } from 'storybook/internal/core-server';
import type { StoryId, StoryIndex, StoryIndexEntry } from 'storybook/internal/types';

import * as find from 'empathic/find';
import path, { dirname, join, normalize } from 'pathe';
import * as walk from 'empathic/walk';
import path, { dirname, join, normalize, resolve } from 'pathe';
// eslint-disable-next-line depend/ban-dependencies
import slash from 'slash';

Expand Down Expand Up @@ -75,19 +76,53 @@ export class VitestManager {
: { enabled: false }
) as CoverageOptions;

const vitestWorkspaceConfig = find.any(
[
...VITEST_WORKSPACE_FILE_EXTENSION.map((ext) => `vitest.workspace.${ext}`),
...VITEST_CONFIG_FILE_EXTENSIONS.map((ext) => `vitest.config.${ext}`),
],
{ last: getProjectRoot() }
);
// In monorepos, the Storybook configDir (e.g. packages/web-app/.storybook) identifies
// the sub-package. We start the Vitest config search from its parent (the package root)
// and traverse upward to the project root, so configs in both sub-packages and the
// monorepo root are found. Without this, find.any defaults to process.cwd() which may
// be the monorepo root and would miss sub-package configs entirely.
const configDir = this.testManager.storybookOptions.configDir;
const packageRoot = configDir ? dirname(resolve(configDir)) : undefined;

const configFiles = [
...VITEST_WORKSPACE_FILE_EXTENSION.map((ext) => `vitest.workspace.${ext}`),
...VITEST_CONFIG_FILE_EXTENSIONS.flatMap((ext) => [
`vitest.config.${ext}`,
`vite.config.${ext}`,
]),
];

const potentialConfigFileLocations = walk.up(packageRoot || process.cwd(), {
last: getProjectRoot(),
});

let vitestWorkspaceConfig: string | undefined;
let firstVitestConfig: string | undefined;

for (const location of potentialConfigFileLocations) {
for (const file of configFiles) {
const maybe = find.any([file], { cwd: location, last: getProjectRoot() });
if (maybe && existsSync(maybe)) {
firstVitestConfig ??= maybe;
const content = readFileSync(maybe, 'utf8');
if (content.includes('storybookTest') || content.includes('@storybook/addon-vitest')) {
vitestWorkspaceConfig = dirname(maybe);
break;
}
}
}
if (vitestWorkspaceConfig) {
break;
}
}

const projectName = 'storybook:' + process.env.STORYBOOK_CONFIG_DIR;

const vitestConfigFallbackLocation = firstVitestConfig || packageRoot || process.cwd();

try {
this.vitest = await createVitest('test', {
root: vitestWorkspaceConfig ? dirname(vitestWorkspaceConfig) : process.cwd(),
root: vitestWorkspaceConfig ?? vitestConfigFallbackLocation,
watch: true,
passWithNoTests: false,
project: [projectName],
Expand Down